AGENDA OF 128 - wrpc.gov.in · PDF fileWork of locating DC earth leakage was taken up by substation staff by removing fuses of DC. ... Also at 400 kV Kansri-Ranchorpura 2 and 400 kV

Agenda for 128th PCM, to be held on 06.12.2016 & 07.12.2016 Page 1

AGENDA OF 128th PROTECTION COMMITTEE MEETING OF WRPC

TO BE HELD ON 06.12.2016 & 07.12.2016

ITEM NO.1: CONFIRMATION OF MINUTES OF 127th PROTECTION COMMITTEE

MEETING

The minutes of 127th PCM, held on 27.07.16 and 28.07.16 at WRPC, Mumbai were

circulated vide WRPC letter No. WRPC/Protection/127PCM/2016/ 10893 dated 05.10.2016.

No comments were received.

Committee may like to confirm the minutes of 127th PCM.

ITEM 2: OCCURANCES/GRID DISTURBANCES:

A. OCCURANCES IN GUJARAT SYSTEM

2.1. Grid Incidence at 400/220 kV Asoj Sub-station on 14th May 2016

On 14th May 2016, at 02:04 hrs, R phase CT (Make: HBB, Date of commissioning:

12.03.1987) of 400 kV Asoj- Kosamba line flashed and caught fire at Asoj substation. Due to

this bus fault occurred on 400 kV Bus 1 on which the circuit was connected at Asoj Substation.

Due to failure and blasting of this CT, other damages are as under.

Y phase CT of Kosamba line.

B phase CT of Chorania 1 line.

B phase LA of Chorania 1 line.

Rotating PI of TBC isolator of Chorania line.

This led to bus fault and Alstom make bus bar protection scheme operated correctly by

tripping 400 kV Bus 1 and all connected lines and ICTs connected to 400 kV Bus 1 and 400 kV

bus coupler tripped. There was no load or generation loss during the event.

Most of the elements were restored by 03:35 hrs; expect 400 KV Kosamba which was

restored at 4:45 of 15.05.16 and 400 KV Chorania 1 was switched off due to damage of CT and

LA from 5:25hrs of 14.05.16 to 20.00hrs of 16.05.16.

The report received from WRLDC is enclosed in annexure 2.1.

Committee may like to discuss.


2.2. Grid Incidence at 400/220 kV Choronia substation on 17th June 2016

On 17th June 2016, at Chorania s/s, 400KV Asoj line no.1 was under outage for line

maintenance work. After completion of work line was charged at 17:22 hours. At 17:55hrs, B-

phase pole (Towards line side) of 400 kV breaker (Make: CGL, Date of commissioning: 29-03-

1994) of 400kV Choronia- Asoj 1 circuit failed at 400/220 kV Chorania substation. With the

bursting of breaker pole, its support column, both side pipe bus connectors and line side isolator

also got damaged which further damaged the Insulator of the Y-phase breaker pole. Damaged

pipe bus connector on the bus side of B-phase pole of the breaker got earthed causing Bus fault

on 400 kV Bus 1 at 400/220 kV Choronia substation. With this, the bus bar protection has

operated for 400 kV Bus 1 resulting in tripping of 400/220KV 500MVA ICT No.1, 400/220 kV

500 MVA ICT 3, 400 kV Choronia-Asoj 1, 400 kV Choronia-Asoj 1, 400 kV Choronia-

Kosamba 1, 400 kV Choronia-Vadavi 1, 400 kV Choronia-CGPL 1, 400 kV Bus coupler to

isolate the fault.

There was no load/generation loss during the event. Most of the elements are restored by

19:19 hrs.

DCRM test was carried out on 04-04-2015 and the Results found normal. On 04-02-2016

breaker timing test was carried out. Routine maintenance like cleaning of porcelain parts etc.

carried out.

The report received from WRLDC is enclosed as annexure 2.2.


2.3. Grid Incidence at 400/220 kV Kansari Sub-station on 12th July 2016

On 12th July 2016, at 01:24 hrs, 220 kV Kansari-Palanpur 2 tripped on distance

protection in zone 2 from Palanpur end only on B phase to Earth fault. Due to VT fuse failure for

both 220 kV Buses, the distance protections relays for 220 kV lines got disabled at Kansari end.

Simultaneously, 220 kV Kansari-Palanpur 1 tripped on distance protection zone 2 from Palanpur

end. At Kansari end, master trip relay operated due to the operation of E/F relay, but breaker

tripped with delay. So, the LBB relay for same line at Kansari end has also operated. As 220 kV

Kansari-Palanpur 1 was connected with 220 KV Bus A, all bays connected with 220 kV Bus A

and 220 kV Bus coupler tripped on operation of bus bar trip relay. During the event, fault has

persistently been seen by remote end and tripping the lines in zone 2. However, there was no

load/generation loss during the event.

During the event heavy DC earth leakage was observed in DC-1 as well as DC-2 source.

Work of locating DC earth leakage was taken up by substation staff by removing fuses of DC


circuit one by one and also checking DC circuit of each control and relay panel for 220 kV Bay.

At 13.21 hrs. due to prevailing DC earth leakage, trip bus of bus bar scheme (pilot wire for Bus 2

tripping) was energized inadvertently and so all feeders and transformers connected with 220 kV

Bus B tripped. 220 kV Bus coupler also tripped. During this event there was no interruption of

power supply.



2.4. Grid Incidence at 400/220 kV Kansari Sub-station on 29th June 2016

On 29th June 2016, at 05:40 Hrs, LBB relay for 400 kV Kansari-Kankroli circuit mal

operated at Kansari end causing tripping of 400 kV Bus Bar 2 at Kansari and tripping of 400 kV

Kansari-Kankroli, 400 kV Kansari-Ranchorpura 2, 400 kV Soja-Kansari, 400 kV Varsana-

Kansari, 400/220 kV ICT 1, 400/220 kV ICT 3 along with bus coupler, connected to Bus 2.

After this event, the 400/220 kV ICT 1 & 3 which were on Bus 1 were out causing load

to shift on ICT 2. This ICT also tripped within 2 minutes on overload. However there was no

interruption at 220 kV level as load was managed through 220 kV system.

Also at 400 kV Kansri-Ranchorpura 2 and 400 kV Kansari-Soja SOE has not generated

from Kansari end. Further Ranchorpura end and Varsana end SOE has also not generated.

Gujarat SLDC and GETCO need to work on these issues with WRLDC SCADA team. Tripping

report along with DR/EL has not been submitted by GETCO to WRLDC/WRPC.



2.5. Grid Incidence at 400/220 kV Kansari (Zerda) Sub-station on 30th June 2016

On 30th June 2016, at 01:35 Hrs. R Phase L.A of 66 kV Kansari-Samsherpura line and 66

kV Kansari-Voda line flashed over during the rainy weather with lightning at Kansari Sub-

station. Simultaneously, Y Phase HV bushing of 220/66 kV, 100 MVA Transformer 3 (CGL

make) also flashed resulting in fire and got damaged. Subsequently fire also took place in OLTC

box, marshaling box and RTCC panel in control room. Due to fire in OLTC drive box, breaker

M.K box, all connected control cables got damaged and D.C leakage has occurred.

Due to the loss of D.C supply to breaker trip coil, 220/66 kV 100 MVA Transformer 3

(CGL make) did not tripped. However, differential trip signal is picked up in the relay. The

transformer differential relay (Alstom makes -MicomP632) is completely damaged due to fire.


The Y-B phase in the system which was not being cleared due to DC leakages causing delayed

fault in the system.

With this 220 kV Lines from Kansari sub-station picked up in zone 2 and tripped. While

the 400/220 kV ICT 1, 2 and 3 at Kansari sub-station tripped on Group A protection from LV

side. Further, 400 kV APL-Kansari, 400 kV Bhinmal-Kansari, 400 kV Kansari-Varsana, 400 kV

Kansari-Ranchodpura 1 and Line reactor of 400 kV Kansari- APL 1 and 2 future lines also got

tripped. There was no major load/generation loss during the event. All the elements are restored

by 20:45 hrs.

The tripping sequence and relay indications from GETCO and report received from

WRLDC are enclosed in annexure 2.5.


2.6. Grid Incidence at Kutch Lignite Thermal power plant, Panandharo on 14th June 2016

On 14th June 2016, at 18:14 Hrs, R phase conductor of 220 kV KLTPS-Kukma 1 circuit

fell on 220 kV Bus 1 at KLTPS in the switchyard causing bus fault on Bus 1. With this 220 kV

lines connected with 220 kV Bus 1 along with Unit 1 & 2 and 220/66 kV ICT got tripped. Total

generation loss during the event was 140 MW and load loss of 20 MW.

The above incident due to lack of details from SLDC Gujarat and KLTPS generating plant,

has been analyzed on the basis of preliminary information at WRLDC and no conclusive

analysis has been made.

Further, it seems that lines have tripped from Bus bar protection operation from 220 kV Bus

1 at KLTPS end. The details are not available from SLDC regarding its operation. The tripping

of 400 kV AKLTPS-KLTPS 2 from AKLTPS (Akrimota) end was not desirable. Further,

tripping of both units was also not desirable in view of bus fault on only one of the bus.

Most of the elements are restored by 20:04 hrs. The Unit 1 at KLTPS is taken into service at

21:31 hrs, and Unit 2 at KLTPS is taken into service at 22:36 hrs.

Gujarat SLDC/KLTPS are requested to submit report on the event along with relevant

disturbance recorder and event logger.



2.7. Grid Incidence at 400/220 kV Pirana PG on 25th June 2016 and its Impact on the Grid

It was reported by PGCIL that rains, lightning and thunderstorm were prevailing at

Pirana (PG) station. On 25th June 2016, at 19:45:10:735 Hrs, Initially Y phase fault appeared in


the 400 kV Vadodara-Pirana (PG) Circuit 2 which was detected by Pirana (PG) relay in Zone 4

i.e. reverse zone. The fault current observed was 19 kA from Pirana (PG) end. After 250 ms of

the fault in Y phase, the fault also appeared in R phase with fault current of 19 kA from Pirana

(PG) end. Fault was still observed by Pirana (PG) end in Zone 4. After 500 ms, the Zone 4 from

Pirana end and Zone 2 from Vadodara end operated and cleared the fault. (DR attached in

Annexure 2.7).

At same time (19:45:10:735 Hrs); Due to the lightning strike on 400 kV Vadodara-

Pirana (PG) 1 circuit, it tripped in stage 2 overvoltage operation at Pirana (PG) station. Direct

trip was sent to Vadodara end and it tripped the line. However the Voltage was still observable

in the line which became zero only after clearance of the fault on parallel circuit. The voltage in

B phase reached to 231 kV to 417 kV during the lightning. The line tripped after 182 ms from

Pirana (PG) end while the voltage has come to zero in the line after 500 ms only. (DR attached

in Annexure 2.7)

As the fault on 400 kV Vadodara-Pirana (PG) 2 circuit was in the zone 1 of the line

however relay of this circuit observed it in zone 4, this resulted in fault being seen by other line

connected from Pirana in their Zone 4 and their remote end in Zone 2. 400/220 kV ICTs of

Pirana (PG) will also be observing this fault in their backup protection from 220 kV side.

This resulted in 400 kV Pirana-Dehgam 1 & 2 tripping in Zone 4 from Pirana end. These circuits

also tripped from their remote end in zone 2. (DR attached in Annexure 2.7)

However, the 400 kV Pirana (Torrent)-Pirana (PG) 1 & 2 circuit did not trip from

Pirana (PG) end in Zone 4. Further, 400 kV Pirana (Torrent)-Pirana (PG) 2 which initially did

not observe the fault in zone 2 from Pirana (Torrent) when fault was in Y phase has seen it as

Zone 3 only. As soon as the fault appeared in R phase in 400 kV Vadodara-Pirana (PG) 2 circuit

after the Y phase, Pirana (Torrent) end relay observed the fault in Zone 2 with increased fault

current and immediately gave the trip command only to the R phase Pole and zone 2 got reset.

The fault at Remote end sub-station of Pirana (PG) got cleared in 500ms and zone 3 got reset.

The other Y and B phase pole of this got tripped after 1.2 second of the fault initiation. (DR

attached in Annexure 2.7) There was no tripping of 400 kV Pirana (Torrent)-Pirana (PG) 1 from

Pirana (Torrent) end in zone 2.

Thus the only 400 kV Incoming feeder to Pirana(PG) was 400 kV Pirana (Torrent)-

Pirana (PG) 1 which through 400/220 kV ICTs at Pirana (PG) kept feeding the 220 kV loads

connected at Pirana(PG).

However, due to this delayed fault clearance and severity of the fault in the system, df/dt

based load shedding relay operated in Gujarat and Maharashtra system causing load shedding. In


Gujarat around 559 MW load has shed while in Maharashtra 411 MW of load was lost on this

account. The net Load loss amount expected is around 970 MW and Energy unserved was in

the quantum of 407 MWHr. The frequency rose from 49.814 Hz to 50.017 Hz ie., a rise of

0.203 Hz.



2.8. Grid Incidence at 400/220 kV Wanakbori Sub-station:

On 18th May 2016, Due to multiple CTs failure at 400 kV level in 400/220 kV

Wanakbori Sub-station between 22:07 to 22:57 Hrs, 400 kV Wanakbori Unit 4, 6 & 7, 400/220

kV Wanakbori ICT, 400 kV Wanakbori-Soja and 400 kV Wanakbori-Dehgam circuit have

tripped along with 400 kV Bus 2.

Prior to the incidence, all 400 kV lines and units were in service at Wanakbori.

At 22:07:54.800 Hrs, R phase CT of Tie Bay of 400 kV Wanakbori-Dehgam circuit and

Unit 6 failed with which bus bar protection operated resulting in tripping of the circuit breakers

in the dia and thus isolating the fault. However, with this all Main breaker of 400 kV Bus 2 has

also tripped on the bus bar differential protection which was not desirable.

At 22:07:56.560 Hrs, B phase to earth fault occurred on 400 kV Wanakbori-Soja circuit

with which distance protection operated thus line got tripped. As Unit 7 was connected via the

tie CB and Main CB of the line through 400 kV Bus 1, it also tripped with the tripping of line.

With these two events, 400 kV Bus 2, Unit 6 and 7 has tripped along with 400 kV Wanakbori-

Soja and Wanakbori-Dehgam circuit at 400/220 kV Wanakbori sub-station.

At 22:57:35.200 Hrs, B phase CT of 400 kV Main Bay of 400/220 kV ICT (which is

between Main Breaker and ICT) at Wanakbori also failed resulting in operation of ICT

differential protection and tripping of Main and Tie CB. As Unit 4 was connected via the tie CB

and Main CB of the ICT through 400 kV Bus 1, it also tripped.

The loss of units has resulted in 581 MW of generation loss.



2.9. Grid Incidence at 220 KV AKLTPS AND KLTPS Sub-Stations on 19th May 2015

During removal of Vibration Damper work on Location No.364(S) of the 220 kV

KLTPS-Kukma circuit 2, an accident occurred at 16:45 Hrs, due to which 220 kV KLTPS-

Kukma circuit 2 got tripped. At the same time, 220 KV AKLTPS-Nakhatrana circuit 1 tripped


only from Akrimota end on SOTF. Afterwards, at 16:56 Hrs, 220 kV KLTPS-Nakhatrana circuit

1 got tripped from both ends due to breaking of conductor at Location No. 58(T).

Simultaneously, 220 kV KLTPS-Nakhatrana circuit 2 tripped only from KLTPS end only.

After that at 16:58 Hrs, 220 kV AKLTPS-Nakhatrana circuit 2 tripped at Akrimota end

only(R-Ph Breaker Pole problem at Akrimota). Simultaneously 220 kV KLTPS-AKLTPS D/C

also tripped at Akrimota end only on Under-Voltage and Under-Frequency.

Due to tripping of above lines and non-availability of Power Evacuation for KLTPS and

Akrimota Generation, all units of Panandharo and Akrimota tripped and hence Blackout

occurred at Panandharo and Akrimota TPS. Due to above incident Panandharo remained in zero

power from 16:58 Hrs. to 17:08 Hrs. i.e. 10 minutes and Akrimota remained in zero power from

16:58 Hrs. to 17:23 Hrs. i.e. 25 minutes. Along with the above, six 66 kV Sub-Stations remained

in zero power from 16:58 Hrs. to 17:18 Hrs. i.e. 20 minutes. Most of the elements were restored

by 23:20 hrs.



2.10. Grid Incidence at 220 kV AKLTPS Sub-station in Gujarat on 24th May 2016

Prior to the incident, only one unit i.e. unit 2 at Akrimota TPS (AKLTPS) was on bar. All

the 220 kV lines were in service from the sub-station. On 24th May 2016, at 05:20 Hrs, B phase

to earth fault occurred on 220 kV Akrimota-Nakhatrana 1 circuit and cleared within 160 ms. The

fault location was 1.5 km from Akrimota end. However with this Bus bar protection for Zone 2

and Zone 3 also operated on C phase resulting in tripping of both the buses and causing

complete blackout at Akrimota sub-station.

The loss of Unit 2 due to blackout cause loss of 95 MW of the generation.

It seems that fault for close in fault on the line, the bus bar protection has mal-operated resulting

in complete loss of the sub-station.




B. OCCURANCES IN MADHYA PRADESH SYSTEM

2.11. Grid Incidence at 220/132 kV Bina Sub-station, Madhya Pradesh on 5th April 2016

220 /132 kV Bina sub-station in Madhya Pradesh is having a SMT bus scheme. Prior to

the event, all the elements were in service at the station. On 05th April 2016, at 05:41 Hrs, B

phase CT of 220 kV Bina-Bina Interconnector 1 circuit failed at 220/132 kV Bina sub-station

resulting in Bus fault. After this bus bar protection operated at Bina sub-station and all 220 kV

elements tripped. However, the fault was observed by the 220 kV Bina-Bina Interconnector 1

from 400/220 kV Bina end in zone 2 resulting in its clearance after 400 ms.

Further, it can be seen that due to fire and fume Y phase fault has also developed in the

system. The Zone 2 operation at remote end is due to the location of CT after the breaker in the

SMT arrangement. As during the morning hour load is less and 132 kV systems were

interconnected so none of the area observed any blackouts and system was intact. It is observed

that remote end has not received direct trip command after us bar protection operation which

may kindly be included in the scheme. This will reduce the fault duration timing as observed in

the above case. MPPTCL may kindly appraise on the above issue in details.

220/132 KV, 160MVA x”mer –I, was restored by 06:17hrs, 132 KV Bina- Bori Ckt I &

II was restored by 06:20hrs, 220/132 KV, 3*40MVA x”mer –III was restored by 11:28hrs,

220KV Bina interconnector was restored by 21:42hrs. 220KV Bina- Vidisha Ckt and Bina-

Ganjbasoda Ckt were restored on 07.04.2016 at 20:12hrs and 20:16hrs respectively.



2.12. Grid Incidence at 400/220/132 kV Cheggaon Sub-station on 4th May 2016 & 18th May

2016

On 4th May 2016, at 11:43 Hrs, due to bursting of B Phase CT of 220/132 kV, 160 MVA

ICT 1 at 400/220/132 kV Cheggaon Sub-station Bus fault occurred on 220 kV bus 1. With this

it’s Bus Bar protection operated resulting in tripping of feeders connected to 220 kV Bus 1.

During the event 50 MW load loss occurred at Cheggaon with energy unserved quantum of 22.5

MWHr. Most of elements are restored by 12:50hrs. 220/132 KV transformer is still out.

On 18th May 2016, prior to the incidence the system was normal and at 400KV S/s

Cheggaon, all 220KV and 132 KV feeders were in charged condition and normally loaded. At

400 KV S/s Cheggaon double main transfer bus scheme exists for 220KV system.


At around 17:20 hrs, Y-phase CT (Make: SCT, date of commissioning: 24th January

2011) of 220 KV Chhegaon – Nepanagar Ckt burst at 400KV S/s Cheggaon resulting 220KV

bus fault consequently bus bar protection of 220 KV main Bus-I operated at 400KV S/s

Cheggaon resulting all connected feeders and transformers tripped.

220KV Main Bus I at 400 KV S/s Chhegaon was energized by charging 400/220KV,

315MVA ICT at 18:09hrs. Later, most of the elements are restored by 18:50hrs.after

replacement of failed Y phase CT of 220KV Chhegaon –Nepanagar Ckt, the feeder was charged

on 19th May 2016, at 21:55hrs.



2.13. Grid Incidence at 220/132 kV Damoh Substation, Madhya Pradesh on 25th May 2016

On 25th May 2016, at 10:00 Hrs, due to mal operation of 220 kV bus bar protection

system at 220/132 kV Damoh (MP) Substation, all 220 kV connected feeders tripped. However,

the 132 kV System remained intact with the system so there was no load/generation loss.

MPPTCL and MP SLDC may kindly submit the data on the event. MPPTCL may give the

reasons for mal operation of bus bar protection relay.



2.14. Grid Incidence at 220/132 kV Mahalgaon (MP) Substation on 20th May 2016

On 20th May 2016, at 08:15 Hrs due to bursting of Y phase 220 kV CT of 220 kV Bina

(MP)-Mahalgaon circuit (which was ideally charged from 220KV Mahalgaon end) at Mahalgaon

end, resulting bus fault occurred on 220 kV bus causing bus bar protection operation and

tripping all connected 220 kV feeders.

However, 132 kV system at Mahalgaon substation remain connected through lines from

132 kV Dabra and 132 kV Karera. Hence, there was no generation/load loss during the event.

Most of the elements are restored by 08:42hrs. The damaged CT has been replaced and 220KV

Bina- Mahalgaon Ckt was ideally charged from 220KV Mahalgaon end on 24th May 2016, at

15:45hrs.




2.15. Grid Occurrence at 220/132 kV Maihar substation on 25th May 2016

On 25th May 2015, at 12:23 Hrs, 220 kV Katni-Maihar circuit got tripped from Katni

End, R phase distance protection operated in zone 1 because of earth fault which has led to the

shifting of entire load of 220/132 kV Keymore and radially connected stations on 132 kV

Keymore-Maihar circuit. At 12:25 Hrs, 132 kV Maihar-Keymore circuit also tripped on R phase

to earth fault due to the disc insulator failure. With this supply to 220/132 kV Maihar substation

was lost and the substation got blackout.

Further at 12:32 Hrs, due to tripping of 132 kV Keymore-Katni Ckt I got tripped from

Katni End, R phase distance protection operated in zone III because of R phase to earth fault has

led to blackout of 132 kV Keymore sub-station. The event caused a load loss of 56.8 MW along

with energy unserved of 13.41 MWhr to the consumers. Most of the elements are restored by

13:13 hrs.



2.16. Grid Incidence at 220/132 kV Malanpur on 20th May 2016

220 kV Malanpur Bus is having a single main and auxiliary bus scheme. Prior to the

event all 220 kV lines and ICTs were in service from Malanpur end. On 20th May 2016, at 23:38

Hrs, B phase CT of 220 kV Gwalior(PG)-Malanpur 1 got burst causing bus fault and tripping of

all the 220 kV connected elements from Malanpur sub-station on Bus bar protection. The 132

kV systems have survived at Malanpur and there was no load/generation loss during the event.

Most of the elements are restored on 21st May 2016 by 01:25hrs.



2.17. Grid Incidence at 400/220 kV Satpura Thermal Power station on 6th April 2016

On 06th April 2016, at 19.50 Hrs. Satpura Unit 9 got tripped on Generator CB Air

Pressure Very Low alarm. After rectification of the same, the unit was being synchronized by

circuit breaker closing at 21:00 Hrs, during the synchronization of Unit 9 of Satpura with 400 kV

Bus 1 at 400/220 kV Satpura Sub-station, its generating transformer REF protection operated

and trip command got initiated to the circuit breaker. However, the circuit breaker failed to trip

and its LBB protection got initiated which gave command to Bus Bar Zone-1 protection

operation to isolate Bus 1 along with the Bus coupler. This led to tripping of all connected 400


kV elements from the bus including Unit 10. As the station transformer for Unit 11 was on Bus 1

which got tripped causing tripping of Unit 11 which was actually on Main bus 2. This leads to

467 MW of generation loss occurred due to the tripping of the Unit 10 and 11 in this event.

Further, with Operation of Bus bar protection due to LBB trip command, the generator

circuit breaker (the same does not operate when REF protection operated and trip command

initiated) has tripped.

All the elements expect unit 9 unit 10 & unit 11 were restored by 22:31 hrs. Unit 10 and

Unit 11 are restored on 07th April 2016 at 00:32hrs and 05:39 hrs respectively. Unit 9 was

restored on 09th April 2016 at 09:05hrs.



2.18. Grid Incidence at 765/400 kV Vindhyachal pooling station on 13th August 2016

On 13th August 2016, at 12:18 Hrs, due to snapping of snapping of 400 kV

Sasan Vindhyachal R phase conductor (Top) and its contact with Y phase (Middle) conductor

has caused R-Y phase to phase fault on the line. With this, distance protection operated at Both

ends thus isolating the fault.

This phase to phase fault was sensed by 400 kV Vindhyachal PS-Sasan D/C and 400 kV

Vindhyachal PS- Vindhyachal IV D/C in zone 3 from the Vindhyachal PS end. The Phase to

Phase pickup for all the above four lines at Vindhyachal PS were assigned in group. This logic

was later modified and corrected as intimated by PGCIL WR-2.

During the event, there was no load/generation loss. All the lines were restored by

13:29hrs expect 400 kV Vindhyachal-Sasan which was restored on 14th August 2016, at

12:05hrs.



2.19. Grid Incidence at Vindhyachal Generating station on 27th May 2016

On 27th May 2016, at 11:50 hrs the Bus Sectionalizer between 400 kV Bus-4 and 400 kV

Bus-6 at Vindhyachal Substation tripped along with bus section 4. It was observed that along

with this tripping, 400 kV Vindhyachal-Jabalpur 2, Vindhyachal -Satna 2, Vindhyachal-Korba,

400/132 kV ICT 1 and Unit 8 have tripped.


The generation loss during the event was 487 MW due to tripping of Unit 8. Most of the

elements are restored by 13:53 hrs.



2.20. Grid Incidence at 220/132 kV Badod on 19th May 2016

Prior to the event all the 220 and 132 kV elements were in service at 220/132 kV Badod

Sub-station. On 19th May 2016, at 23:12 Hrs, R phase line side CVT of 220 kV Badod-Nipaniya

circuit burst at Badod end. This led to tripping of all 220 kV elements like 220 kV Badod

Nipaniya, 160 MVA 220/132 kV ICT 1, 160 MVA 220/132 kV ICT 2, 220 kV Badod Sakatpur,

220 kV Badod Ujjain 1, 220 kV Badod Ujjain 2 on Bus bar protection from Badod sub-station.

This led to loss of 132 kV radial network in the Badod causing loss of 20 MW load.

Restoration started by taking Badod-Ujjain ckt 1 and 2 in service by 00:08 and 00:10 Hrs

respectively on 20 May 2016. After this other elements were restored.

WRLDC has noted that, this is the second event after 27th November 2015 where

bursting of line CVT resulted in Bus bar protection operation at Badod sub-station. It is

observed that the fault was on line CVT which should have been cleared by the line protection

however bus bar protection also operated. CT wiring for Bus bar protection at 220 kV Badod

needs to be checked in order to verify the correct operation of protection during the event. Also,

whether the line protection got blocked due to loss of CVT voltage (due to its damage) should

also be checked. Also, in such cases it is beneficial to have backup overcurrent protection logic

for line tripping which discussed in 126th PCM.



2.21. Grid Incidence at 220/132 kV Birsinghpur (MPPTCL) Sub-station on 18th May 2016

At 220/132 kV Birsinghpur S/s, Double Main and Transfer Bus Scheme exists for 220

kV Bus. Bus Bar Protection for 220 kV sub-station was out of service. Further, the due to theft

of protection cable of 220 kV Birsinghpur-Jabalpur 2, its protection was out of service at 220 kV

Birsinghpur S/s (Report of MP SLDC).

220 kV Birsinghpur –Birsinghpur TPS Interconnector 1 was kept open from 220 kV

Birsinghpur S/s end since 11:31 Hrs. of 11.05.2016 due to High voltage. 220 kV Birsinghpur -


Birsinghpur Hydel circuit was also kept open from Birsinghpur HPS end. Remaining all 220 kV

and 132 kV feeders at Birsinghpur S/s were in charged condition and normally loaded.

220 kV Bus Coupler Breaker and 220 kV Bus Tie Breaker at 220 kV Birsinghpur S/s were out,

hence 200 kV Main Bus 1 and 220 kV Main Bus 2 have been made as Rigid Bus by closing the

Main Bus 1 and Main Bus 2 isolator of 220 KV Birsinghpur-Jabalpur 1 at 220 kV Birsinghpur

S/s. (Report of MP SLDC).

At 14:56 Hrs, due to R phase to earth fault on 220 KV Birsinghpur – Jabalpur 2 and its

line protection being out of service at Birsinghpur end has resulted in tripping of all the feeders

from Birsinghpur end on distance protection from remote ends. This has led to blackout of

220/132 kV Birsinghpur Sub-station along with radially fed 132 kV Umariya sub-station. Total

load loss during the event was 37 MW with energy unserved quantum of 21.58 MWHr.

First the 220 kV 220 kV Jabalpur – Birsinghpur 2 was charged to extend supply to 220

kV Birsinghpur followed by charging of 220/132 kV ICT. After this traction supply was

extended.



2.22. Grid Incidence at 400 kV Indirasagar (ISP) power Plant on 4th June 2016

On 04th June 2016, at 12:15 Hrs, while transferring the 400 kV ISP-Nagda from 400 kV

Bus 2 to 400 kV Bus 1 at 400 kV ISP substation, the bus bar protection operated causing 400 kV

Bus 2 tripping and loss of all elements at 400 kV Indirasagar substation. This has led to complete

blackout of the substation.The exact details of the cause of Bus bar protection operation could

not be found in absence of DR/EL from the Indirasagar Substation.

Due to tripping of ISP Unit 6, generation loss of 100 MW occurred as observed from WRLDC

SCADA.

Supply at ISP was resumed by charging 400KV STPS – ISP Ckt at 13:42hrs.

Subsequently 400KV ISP- Indore Ckt II and 400KV ISP- Nagada Ckt were charged at 14:06 and

14:38 respectively, later units were synchronized.




2.23. Grid Incidence at 400 kV Indirasagar (ISP) on 18th May 2016

Prior to the event as intimated by the event, All 400 kV Lines along with Unit 1 and 8

were in service from ISP. 400 kV ISP is having a Double Main Transfer Scheme Bus bar

arrangement. So, In order to create a balance 2 feeders and 4 units are kept on one bus at a time.

However, due to pantograph isolators issue the same could not be followed on various occasions.

As per the details given by SLDC it was observed that 400 kV ISP-Indore 1, 400 kV

ISP-Nagda and Unit 1 were on 400 kV Bus 1 while 400 kV ISP-Indore 2, 400 kV ISP-Satpura

and Unit 8 on 400 kV Bus 2. 400 kV Bus Coupler was in service. However the single diagram as

available in the WRLDC indicating that all the lines and units were on both the buses and the

bus coupler was out of service as it’s one of the isolator was in open condition. The single

diagram of the sub-station on 18 May 2015 at 02:15 Hrs. from WRLDC SCADA is shown in

figure 2 of Annexure 2.23, based on which WRLDC have made their analysis.

At 02:19 Hrs, 400 kV R phase CVT of 400 kV Bus 2 has burst resulting in the bus fault on

400 kV Bus 2. With this Bus bar protection has operated however with this all elements from

both the buses have been tripped which was not expected. The Fault as observed from the

Synchrophasor data at Dehgam which indicate the R phase fault which is cleared within the

time. Due to Static Bus bar at Indirasagar, DR is not available for bus bar operation. However

from the available DR of all the four lines it is observed that fault has cleared within 120 ms (All

DRs are attached as annexure however they are not time synchronized). Based on the available

details from DR, 400 kV ISP-Satpura & ISP-Nagda has Bus Bar operation along with DT send

to remote end while the 400 kV ISP-Indore 1 and 2 were having DT send command only at the

time of trip during the R phase fault.

This caused complete blackout of the sub-station along with generation loss of 215 MW.

After isolation of 400 kV Bus 2, 400 kV Bus 1 was charged by taking 400 kV ISP-Indore 2 at

03:30 Hrs. After this, other lines were taken in service followed by Unit 2 at 03:45 and Unit 7

04:15 Hrs.



2.24. Grid Incidence at 400 kV JP Nigrie Sub-station on 14th April 2016

Prior to the incident, Both 400 kV JP Nigrie-Satna 1 & 2 along with JP Nigrie Unit 1 &

2 were in service. On 14th April 2016, At 13:29:37.409 Hrs: R Phase to E/F occurred on the 400

kV JP Nigrie-Satna 1 circuit which was in Zone 1 from Satna and Zone 2 from JP Nigrie. Both


ends issued the single phase tripping with carrier exchange. This fault was detected as Zone 4

(reverse zone fault) by the Satna end relay for circuit 2. (DR from both ends are attached as

annexure) Within 350 ms, direct trip for both circuit was received at Satna end from JP Nigrie.

Based on the DR it was observed that Tie CB of the 400 kV JP Nigrie-Satna 1 & 2 (these circuits

are in the same dia at JP Nigrie end) LBB has operated which was undesirable as there was no

breaker issue at JP Nigrie end. On further, analysis of disturbance it was observed that the LBB

timer for R phase of the Tie CB of these circuits at JP Nigrie end has initiated with the trip

command given from Main 1 protection and got reset as the breaker has successfully opened.

However, even after the reset , the LBB three phase trip has initiated which issued the

LBB protection operation and tripping command to both all breakers in the Dia (Main Breaker

of 400 kV JP Nigrie-Satna 1 & 2 circuits) at JP Nigrie end. Also, as per the LBB scheme, it has

sent the direct command to the remote end of the lines causing their tripping from the Satna end

along with JP Nigrie end. With these, the evacuation path of JP Nigrie units 1 & 2 each of

capacity 660 MW was lost resulting in their tripping. With these, Unit 1 and 2 at JP Nigrie also

tripped causing generation loss of 1089 MW.

After the event, restoration was started by charging of JP Nigrie Circuit 2 at 14:23 and

circuit 1 at 17:32Hrs. After this Unit 2 was synchronized at 18:03 Hrs and Unit 1 at 19:03 Hrs.



2.25. Grid Incidence at 400 kV JP Nigrie Sub-station on 1st May 2016


2 were in service. On 01st May 2016, at 12:24Hrs. R Phase to E/F occurred on the 400 kV JP

Nigrie-Satna 1 circuit which was in Zone 1 from Satna and Zone 2 from JP Nigrie. Both ends

issued the single phase trip with carrier code exchange (DR from both ends are attached as

annexure 2.24). The fault current from Satna was 12.9 kA while from JP Nigrie it was 3.17 kA.

Within the next 350 ms, direct trip for both circuit was received at Satna end from JP Nigrie.

At the same time, LBB protection of the Tie Circuit breaker of JP-Nigrie-Satna 1 & 2 at

JP Nigrie end has operated resulting in tripping of Main Breakers and sent the direct trip code to

remote end Satna sub-station. This led to tripping of both lines from Satna end. With the tripping

of these lines, the JP Nigrie has suffered complete blackout of substation as it is connected to

Indian grid via these two lines. With these, Unit 1 and 2 at JP Nigrie also tripped causing


generation loss of 1092 MW. Due to Loss of generation frequency dropped from 50.032 Hz to

49.900 Hz (drop by 0.132 Hz)

After the event, restoration process was started by charging of JP Nigrie Circuit 2 at

12:55 and circuit 1 at 19:46 Hrs. Further, Unit 1 was synchronized at 16:17 Hrs and Unit 2 at

20:01 Hrs. Further, Based on the submitted DR it was observed that this incident is the repetition

of the GD-1 event at this station which occurred on 14th April 2016.



2.26. Grid Incidence at 400 kV JP Nigrie Sub-station on 02nd September 2016

Prior to the event, all the elements from JP Nigrie were in service. On 02nd September

2016, at 16:04 Hrs, Y phase to Earth fault occurred on 400 kV J P Nigrie-Satna 1 & 2 in zone 1

from both ends. Line After tripping Y phase went for A/R cycle and taken attempt after one

second. During this, fault persisted on circuit 1 which tripped immediately while circuit 2 got

successfully reclosed. However, during A/R instant of Y phase on circuits, both units got tripped

on under voltage trip alarm.With the tripping of both units of JP Nigrie, there was a generation

loss of 1051 MW. As 400 kV JP Nigrie-Satna 2 circuit was in service so immediate restoration

activity of system has started. It can be seen that by 18:57 complete system has been restored

along with the both units.

In this event, simultaneous transient fault was observed on both the lines out of which

one has reclosed and other tripped due to persisting fault respectively. The reason for the

simultaneous fault on the line has not been provided by the utility. Such kind of events are rare

and need a detailed analysis to find the root cause so that remedial action can be taken in

advance. Also it was observed that during the A/R occurring on both lines, JP Nigrie both units

have tripped on under voltage protection. Further, It was observed that 128 ms drift has been

observed in JP Nigrie end DR for transmission lines. While the generating Units DR and event

logger are way out of time synchronization by more than 2-3 minutes.

JP Nigrie should time synchronize their DR and event logger. The cause of under

voltage, Unit protection setting etc. should be checked by JP Nigrie.




2.27. Grid Incidence at 400 kV JP Nigrie Sub-station on 03rd May 2016


2 were in service. On 03rd May 2016, at 21:07hrs. R phase to earth fault occurred 400 kV JP

Nigrie –Satna 2 circuit. Both ends have issued the single phase trip for A/R. With this the flow in

other circuit increased and from Satna end the Zone 3 picked up. After 1 second the circuit 1 got

tripped from Satna end on Zone 3 protection. While A/R operated successfully at JP Nigrie end

after 1.2 second while no reclosure occurred at Satna end. With this generator at JP Nigrie was

connected with only two phases with the grid and after 300 ms fault reappeared and circuit

tripped. With tripping of both lines, JP Nigrie generator isolated from the system and tripped

causing loss of 1211 MW of generation.

JP Nigrie has charged the circuit 1 immediately as it was in charged condition from

Satna end. After this Unit 1 and 2 were synchronized at 002:48 and 00:08 Hrs respectively. Line

2 was taken in service at 09:02 Hrs.

This is the third time in recent months when complete blackout of the JP Nigrie sub-

station has occurred and in three cases loss of generation is more than 1000 MW. The frequency

of the grid has dropped by more than 0.13 Hz in the three occasions. These events need to be

reviewed immediately from the system reliability and security point of view.

JP Nigrie is advised to check all the three incidents in detail and perform the root cause

analysis and present the same in PCM.



2.28. Grid Incidence at 400 kV JP Nigrie Sub-station on 22nd June 2016


2 were in service. On 22nd June 2016, at 13:18hrs, R phase to earth fault occurred on the 400 kV

JP Nigrie-Satna 2 circuit at around 56 km from Satna end. Both ends relays have tripped the line

in carrier aided zone 1 protection with which its R phase pole got opened. Zone 3 started in 400

kV JP Nigrie Satna 1 circuit at JP Nigrie end due to increased loading on this circuit. After

around 332 ms (13:18:14.025) Zone 2 also pickup in this circuit and within next 105 ms

(13:18:14.130) the circuit has tripped from JP Nigrie end. The reason for this tripping could not

be ascertained from the submitted DR from JP Nigrie end. This led to the shifting of complete

1246 MW on the Y & B healthy phases of 400 kV JP Nigrie-Satna 2 circuit with which power


swing started in the circuit with current reaching to 3.5 kA in phases. At 13:18:27.154: DT was

received at Satna end on 400 kV JP-Nigrie-Satna 1 circuit causing its tripping.

This led to islanding of JP Nigrie from the grid however, AVR of Units responded and

the voltage was held constant and line reclosed from JP Nigrie end. However, both units got

tripped on over speed/over frequency due to system islanding from the grid. Generation loss due

to JP Nigrie Unit 1 and 2 tripping was 1246 MW.

Restoration was immediately started by taking 400 kV JP-Nigrie-Satna 1 is service

which was in charged condition from Satna at 13:21. While the circuit 2 was taken in service at

15:51 Hrs. This was followed by taking Unit 1 and Unit 2 synchronization at 16:06 and 16:18

Hrs respectively.



2.29. Grid Incidence at 220/132 kV Malanpur Sub-station on 7th April 2016

220 kV Malanpur Bus is having a single main transfer bus scheme. Prior to the event,

All 220 kV and 132 kV elements from Malanpur were in charged condition and loaded within

permissible limit. 220 kV Malanpur-Gwalior (PG) 2 circuit was charged through 220 kV Bus

coupler breaker 2 since 14:51 Hrs of 04-04-15 due to over howling of its main breaker at

Malanpur end.

On 7th April 2016, at 20:30 Hrs, R phase CT (SCT make) of 220 kV Malanpur-Gwalior(PG)

1 at Malanpur end which was charged through the bus coupler breaker 2 burst causing bus fault

in the system resulting in Bua bar protection for Zone 1 and Zone 4 operation and tripping of all

220 lines and 220/132 kV ICTs. With these blackout occurred in the 220/132 kV Malanpur and

radial connected 132 kV Ambha, Bhanmore, Morena, Morara, Badgaon sub-stations.

Supply at 132 KV S/s Banmore was resumed by charging 132 KV Banmore – Motijheel Ckt

– II at 22:39 Hrs, 132 KV Supply at 220KV S/s Malanpur was resumed by charging 132 KV

Malanpur – Mehgaon Ckt at 22:40 Hrs. subsequently supply was extended to interrupted ares by

charging respective transformers and feeders.




2.30. Grid Incidence at 400 kV MB Power on 25th May 2016

Prior to the event, Unit 2 of MB power was out due to flame failure since 16 May 2016.

There were heavy rain and thunderstorm reported in the Anupur.

At 09:14 Hrs, R phase to E/F occurred on 400 kV MB Power-Jabalpur PS 2 circuit and it

tripped on Distance protection. (DR attached as annexure 2.30). After this at 14:28 Hrs, Due to

lightening on the bus reactor at MB Power, its R and Y phase lightning arrester and isolator got

damaged and with this bus reactor differential protection operated. However, the Main 2

protection of Line 1 at MB power end also operated for Zone 4 fault in zone 1 resulting in

tripping of this circuit resulting in islanding of MB power station from the grid. With this, Unit 1

of MB power tripped with TURBINE tripping of over speed protection and with this sub-station

got blackout.

Net generation loss due to tripping of the Unit 1 was 477 MW. Most of the elements are

restored by 17:03hrs, the unit 1 was taken into service on 26th May 2016 at 17:24hrs.



2.31. Grid Incidence at 400 kV MB Power on 30th April 2016

Prior to the event, Bad weather with high wind were prevailing at the MB Power Sub-

station. 125 MVAR bus reactor was out of service at the MB power sub-station resulting in

opening of 407 and 408 CB. This has resulted in MB power Unit 2 connection to the Main Bus 1

through only one CB i.e. 407 CB as it is in same diameter of the bus reactor.

On 30th April 2016, at 15:01:43.841 Hrs, B Phase Bus side isolator of GT 2 got opened

due to wind resulting in Bus fault due to arcing as it came in induction zone of the Y phase. With

this, Bus bar protection Zone 1 operated which resulted in tripping of Main Bus 1 and all

connected Main bus breaker ( Breaker 403,406 and 409). This resulted in isolation of the fault

within 60 ms. (DR is attached as annexure 2.31). Due to this MB power Unit 2 has tripped.

While the Unit 1, ST, 400 kV Jabalpur PS-MB Power 1 & 2 circuit remain in service with

Healthy 400 kV Bus 2 at MB power.

At 15:01:43.853 Hrs, The Fault was also seen by the 400 kV Jabalpur PS-MB Power 1

& 2 circuit from Jabalpur PS end in zone 2. However both circuit has issued three phase trip to

the circuit. This has resulted in Islanding of the MB Power Unit 1 from the grid. There is no

house load operation scheme in operation at The MB Power station at present otherwise unit

could have gone to House load of 83 MW (Aux consumption) and survived. The loss of


connectivity to the grid was seen as load throw off by the islanded system of Unit 1 with aux

consumption load and 400 kV charged lines losses which resulted in increase in the island

frequency (MB Power station) causing over speeding of Generating unit 1.

At 15:01:45.743 Hrs, Unit 1 tripped on over frequency at 56.2 Hz. With this complete

blackout occurred at MB power. At 15:39 Hrs, 400 kV Jabalpur PS- MB Power 1 circuit was

taken in service. However, due to isolator opening of B phase isolator of the line reactor of 400

kV Jabalpur PS- MB Power 1 circuit at MB Power end, Y-B phase fault occurred causing line

tripping. With this again blackout occurred at station. Total loss of generation with tripping of

both Units of MB power was 1025 MW.

Restoration started by checking of all the isolators in the yard at MB Power as two

isolators have got opened during the event. First at 18:28 Hrs, 400 kV Jabalpur PS-MB Power 2

was charged follwed by 400 kV bus 2 at MB power. 400 kV MB power Bus 1 was charged at

20:15 Hrs followed by charging of ckt 1 at 22:08 Hrs. Units 1 & 2 were then taken subsequently

into service on 01st May 2016 at 15:26 hrs and 01:05 hrs respectively.



2.32. Grid Incidence at 400 kV MB Power on 30th August 2016

Prior to the event, System was in normal state with 400 kV MB Power-Jabalpur PS both

lines in service along with MB power Unit 1. Unit 1 was generating 455 MW prior to the event.

On 30th August 2016, at 08:08:18.347 hrs, 400 kV MB Power-Jabalpur PS circuit 2 tripped

from Jabalpur PS end on direct trip receipt command. At 08:08:18.801hrs, 400 kV MB Power-

Jabalpur PS circuit 1 tripped from Jabalpur PS end on Direct trip receipt command. This caused

islanding of MB power system and MB power Unit 1 responded with forced AVR response.

However due to hanging lines, the voltage started picking up with no load condition for units. At

08:18:19:421hrs, 400 kV MB Power-Jabalpur PS circuit 1 tripped from MP Power end on Direct

trip receipt command. Over Voltage stage 2 operated at Jabalpur PS. At 08:18:19:446hrs, 400

kV MB Power-Jabalpur PS circuit 1 tripped from MP Power end on Direct trip receipt

command. Over Voltage stage 2 operated at Jabalpur PS as well as MB power PS. MB Power

Unit 1 thereafter tripped on over frequency. Generation loss quantum during the event MB

Power Unit 1 was 455 MW.

The restoration in the MB power case was quite delayed as Jabalpur PS end was getting

continuous carrier signal at their end. Finally, after clarification from PGCIL Jabalpur and MB

power on 1st September 2016, 400 MB Power-Jabalpur PS 1 was charged at 10:45 Hrs and


circuit 2 at 10:49 Hrs. MB power Unit 1 was synchronized at 18:01 hrs however it tripped on

turbine tripping at 18:14 Hrs. Further, it was synchronized at 18:45 Hrs.

Further, it was observed that on 8th Sept 2016 at 15:53 Hrs, 400 kV MB Power-Jabalpur PS 2

circuit tripped from MB power end on receipt of direct trip from PGCIL end. PGCIL has

informed that they are looking into the issue with this event however so far no details have been

received



2.33. Grid Incidence at 220/132 kV Mehgaon Sub-station on 4th April 2016

220/132 kV Mehgaon is having a single main and auxiliary bus scheme at 220 & 132 kV

level. At 01:05 Hrs, Y Phase CT of 220 kV Malanpur-Mehgaon line at Mehgaon end burst

resulting in Bus fault at Mehagon S/s. This led to Bus bar protection operation and tripping of

220kV Mehgaon-Auraiya line and the 220/132 kV ICTs. With this blackout at Mehgaon

occurred resulting in load loss of 70 MW and energy unserved quantum of 23.33 MWHr.

The restoration of load was taken up immediately by taking 132 kV Malanpur-Mehgaon

circuit at 01:25 Hrs which is in general kept out. After this at 02:26 Hrs, Mehgaon-Auraiya was

taken in service thus 220/132 kV ICT 1 & 2 came into load.



2.34. Grid Incidence at 220/132 kV Mehgaon Sub-station on 29th August 2016

Prior to the incident, the 220 kV Mehgaon-Malanpur S/C was out since 28th August 2016

from 21:19 Hrs on R phase to earth fault. Line could not be restored due to persisting nature of

the fault. Now the Mehgaon system was being fed from 220/132 kV Mehgaon substation and its

radial system was being fed from 220 kV Mehgaon-Auraiya and 132 kV Mehgaon-Malanpur

circuit.

On 29th August 2016 at 01:27 hrs, the 220 kV Mehgaon-Auraiya circuit tripped from bus

fault at Auraiya end causing the shifting for complete load of 220/132 kV Mehgaon and its redial

connected sub-station on 132 kV Mehgaon-Malanpur circuit which also tripped on overcurrent

protection. With this, in absence of any source feeder at Mehgaon, Substation along with radial

connected 132 kV Stations got dark out.

Load loss in tune of 122 MW has occurred during the event. The Energy unserved

quantum during the event calculated based on the loss was around 708.67 MWhr.


Restoration was initiated by charging 132 kV Mehgaon-Malanpur and taking around 87

MW of the load. In the morning the 220 kV Mehgaon-Malanpur was restored and rest of the

loads was taken in service.



2.35. Grid Incidence at 220/132 kV Pandhurna substation on 6th June 2016

Prior to the event there was rainfall and wind at 220/132 kV Pandhurna sub-station. At

15:57 Hrs, its 220 kV Bus main bus B phase flyover jumper post insulator broke down causing

the jumper to swing. This led to the bus fault however, all the 220 and 132 kV tripped from the

remote end protection. This caused blackout at 220/132 KV Pandhurna Substation and loss of

around 50 MW. The energy unserved quantum during the event was 25 MWHr. Most of the

elements are restored by 16:55hrs.



2.36. Grid Incidence at 220 kV Rewa, Siddhi and nearby Area on 4th August 2016

On 04th August 2016, at 12:04 Hrs, 220 kV Birsinghpur (SGTPS)- Rewa Circuit tripped

on transient fault from both ends. Simultaneously 132 kV Amarpatan-Maihar circuit also tripped

due to overloading. Consequently the complete load of 220 kV Rewa & 220 kV Sidhi substation

got shifted on 220 kV Amarkantak-Sidhi Circuit, resulting in its over loading and tripping at

12:16 Hrs.

Due to the above tripping interruption occurred in following areas due to non-

availability of any other supply source: 220 kV Rewa, 220 kV Sidhi, 132 kV Rewa,132 kV

Sidhi, 132 kV Deosar, 132 kV Mauganj,132 kV Katra,132 kV Mangawan,132 kV Rewa II

(Sagra/Paharia), 132 kV Rampur Naikin, 132 kV Beohari,132 kV Amarpatan, Jhinna HPS,

Silpara HPS, Devlond HPS,220 KV Hindalco (Industry) substations.

This led to 240 MW load and energy unserved quantum of 97.91 MWHr. Most of the

elements were restored by 13:08hrs. 220 kV Satna – Satna (PGCIL) Interconnector – II was

charged at 13:31 Hrs after attending the hot point. Thereafter 220 kV Rewa – Tons Ckt – I was

charged at 13:58 Hrs.




2.37. Grid Incidence at Tons HPS on 23rd May 2016

On 23rd May 2016, at 14:50 Hrs, due to falling of lighting cable of switchyard lighting

on 220 kV Main Bus 2 and its earthing through the structure at 220 kV Tons has led to Bus fault

at Tons. The event occurred due to heavy rainfall and wind. The bus fault caused tripping of all

elements from tons and blackout at the Tons hydel power station. During the event, Unit 1of

Tons tripped causing 105 MW loss of generation.

Supply at Tons HPS was resumed by charging 220KV Tons-Rewa Ckt I at 17:38hrs.

Subsequently rests of the elements were restored thereafter.



2.38. Grid Incidence at HPS-Rewa and Siddhi on 25th May 2016

Prior to the event, multiple 220 kV lines were out in the area due to tower collapse during

the heavy rainfall and wind. During these time 220/132 kV Rewa and Siddhi substations were

radially fed from 220 kV Tons substations through 220 kV Tons-Rewa D/C.220 kV Bus 2 of

Tons having a double main transfer bus scheme was under outage. Therefore at Tons all

elements were connected to 220 kV Bus 1.

On 25th May 2016, At 11:59 Hrs, B Phase to E/F occurred on 220 kV Satna-Kotar circuit

during heavy rainfall and wind. With this 220 kV Satna-Kotar along with 220 kV Tons-Kotar

circuit tripped. However, with the opening of 220 kV Tons-Kotar circuit at Tons substation, its

LBB has operated resulting in tripping of 220 kV Bus 1 (Bus 2 under outage) along with all

connected element outage at Tons. During this time, 220/132 kV Rewa and Siddhi substations

were being radially fed from 220 kV Tones-Rewa D/C, their tripping from tons has caused the

blackout of 220/132 kV Rewa and Siddhi substations and associated 132 kV substations at lower

voltage level. With this, 128 MW load was lost in the area with energy unserved quantum of

85.33 MWHr.

Supply at Tons HPS was resumed by charging 220KV Tons-Satna Ckt at 12:24hrs.

Thereafter supply was extended to 220KV S/s Rewa by charging 220KV Tons-Rewa Ckt at

12:29hrs. Subsequently rests of the elements were restored thereafter.




C. OCCURANCES IN MAHARASHTRA SYSTEM

2.39. Grid Incidence at 400 kV & HVDC Bhadrawati Sub-station on 4th May 2016

On 04th May 2016, at 19:16 Hrs : B Phase to Earth fault occurred in 400 kV Bhadrawati-

Ramagundam 1 and it auto reclosed at Bhadrawati end but did not auto-reclose at Ramagundam

end. Within 10 seconds the line tripped from Bhadrawati end also due to direct trip received

from Ramagundam end. The direct trip may be due to open end of line causing overvoltage

protection at Ramagundam end. Now, HVDC Bhadrawati Pole-1 & 2 were carrying 700 MW in

west to south direction with 400 kV Bhadrawati - Ramagundam 2 line in service.

At 19:26 Hrs. 400 kV Bhadrawati-Ramagundam 2 also tripped on B phase to earth fault.

As per the auto-reclosure scheme it did not operate and subsequently, due to AC under voltage

on South Bus, both the Poles tripped on "GROUND FAULT" & "DC>AC" alarms. This resulted

in sudden change in power flow of A/C interconnection to southern grid i.e. 765 kV Solapur-

Raichur 1 & 2 and 400 kV Kolhapur-Narendra D/C.

Restoration was carried out at 20:21 Hrs, 400 kV Bhadrawati-Ramagundam 1 line was

charged thereby energizing South Bus bar of HVDC Bhadrawati S/s. After this an attempt was

made to deblock HVDC Pole-2 but the pole failed to deblock due to “RPC request to standby

“signal from Reactive power Control(RPC).

Meanwhile, on 05.05.2016 at 01:59 Hrs, Ramagundam-1 line tripped on over voltage

protection operation at Bhadrawati end. Line was taken back into service at 02:59 Hrs. The filter

availability was made available to RPC by resetting the power supply units and processor cards

in RPC and both the Poles were normalized on 05/05/2016 at 04:40Hrs & 03:40Hrs respectively.

400 kV Bhadrawati-Ramagundam 2 could be taken in service immediately as when the charging

attempt was made from Ramagundam end on 05.05.2016 at 05:30 Hrs the line has tripped on

operation of SOTF protection. After rectification work completion, it was taken on 5th May

2016 at 21:33 Hrs.



2.40. Grid Incidence at 400/220 kV Dhule Sub-station on 28th May and 14 July 2016

There were two incidents of RADSS Bus Bar scheme Mal-operation for 400 kV Bus at

400/220 kV Dhule Sub-station of MSETCL. The First incident occurred on 28th May 2016 at

08:46 Hrs where the 400KV Bus Bar protection operated in zone – A. At that time there was no


actual bus fault or any external fault too. Also at that time no yard operation is going on. The bus

bar scheme is RADSS. Only U flag indication is available i.e. tripping flag, also there was no

phase indication this implies the bus bar mal operation. The bus bar operation causes tripping of

all 400 KV Bus 1 connected elements. The mal operation is due to carbonization of R-ph & Y-

ph of RQDA module. This is cleaned up and all the elements are taken into service by 11:44hrs

and normalcy restored in the system.

The second incident is on 14th July 2016 at 21:08 Hrs, where the 400KV Bus Bar

protection operated in zone – B. At that time there was no actual bus fault or any external fault

too. Also at that time no yard operation is going on. The bus bar scheme is RADSS. Only U flag

indication is available i.e. tripping flag, also there was no phase indication this implies the bus

bar mal operation. The bus bar operation causes tripping of all 400 KV Bus 1 connected

elements. The mal operation is due to carbonization of R-ph, Y-ph & B-ph at SR/DR card of

RQDA module. This is cleaned up and all the elements are taken into service by 23:44hrs and

normalcy restored in the system.



2.41. Grid Incidence at 400/220 kV Karad Substation on 12th April 2016

Prior to the event the voltage of 400 kV Karad bus was 424 kV and Kolhapur 416 kV. In

order to control the voltage during evening and night off peak hour, the 400 kV Karad-Kolhapur

1 circuit was being opened at 16:38 Hrs. Line got opened successfully however, after 274 ms the

external flashover on the R phase breaker pole was observed at Karad end. The arcing persisted

for around 15 seconds and after this pole got burst creating a bus fault in the system. (DR from

Karad end is attached as annexure 2.41) With this 400 kV Bus bar protection for Zone 1 has

operated resulting in tripping of all 400 kV elements from Karad end along with the bus coupler.

During the event, there was no load/generation loss as the 400 kV Bus 2 and remaining lines

from Karad were in service.

This case is similar to the event which occurred on 28th August 2015 when the 400 kV

Karad-Kolhapur 1 circuit was opened with Karad voltage above 424 kV causing bursting of R

phase pole of the circuit breaker and Bus fault on the 400 kV Bus 1 at Karad.




2.42. Grid Incidence at 400/220 kV Kolhapur on 13th May 2016

Prior to the event there were heavy rain, storm and lightening at the Kolhapur Sub-

station. On 12th April 2016, at 15:59 Hrs, the B phase CT of 400 kV Kolhapur-Kolhapur GIS

circuit 2 at Kolhapur end observed flashover on its surface. This led to Bus fault on the line as

well as its Line fault observed from both end of the line. The circuit was connected on 400 kV

Bus 2 at Kolhapur end so accordingly Bus bar protection operated and tripped all 400 kV

connected elements.

However, there was no load/generation loss as other circuit and ICTs has managed the

load along with the 220 kV networks. After analysis it was found that flashover has occurred

over the CT and with the cleaning of the CT, its C, Tanδ, IR were found within the limit. After

that, it was charged from Kolhapur GIS end however due to hissing sound, corona ring for the

CT was changed. With this line was successfully charged on 14th May 2016, at 22:29hrs.



2.43. Grid Incidence at 400/220 kV Nagothane Substation on 30th September 2016

On 30th September 2016, at 18: 05 hrs, R Phase IPS tube between ‘C’ bus isolator to

line isolator for 400 kV Nagothane-RGPPL 1 circuit got disconnected from Clamp at Nagothane

end disconnected from creating bus fault on 400 kV Bus 2 at Nagothane. With this 400 kV Bus 2

bus bar protection operated resulting in tripping of 400 kV Bus 2 along with all connected

lines/ICT and Bus coupler.

The 400KV main bus –II is charged by taking 400KV bus coupler into service at

18:40hrs and thereafter ICT – III and 400KV Padghe-II were taken into service at 18:42hrs &

20:11hrs respectively.



2.44. Grid Occurrence at 400/220/100 kV Padghe and HVDC Padghe S/s on 28th April 2016

On 28th April 2016, aat 15:55 Hrs, 50 MVA 220/22 kV BHEL make transformer 220 kV

side Y-phase stub bus (jack bus) suspension string insulator got decapped and fell on gantry

which created the 220 kV main bus 2 (Bus Zone 2) fault at 400/220 kV Padghe s/s. The 50

MVA, 220/22 kV BHEL TF is connected to 220 kV main bus 2 from 220 kV side and all lines,

ICTs, Transformers connected to 220 kV main bus 2 tripped on bus bar protection.


With this 220 kV Padghe –Nalasopara feeder along with 400/220/33 kV ICT 2 & 3

which were on 220 kV main bus 2 also tripped. Due to this the radial load of about 135 MW of

220 kV Nalasopara s/s got completely disconnected.

The 33 kV Auxiliary of HVDC Padghe was being fed through 33 kV Supply of

400/220/33 kV ICT 3 and 220/22 kV transformer and during the event both got tripped. Due to

loss of auxiliary supply and non-sustaining of load on the UPS-battery bank system and issues

with Diesel generators, both poles of HVDC Chandrapur-Padghe at Padghe got tripped. The

total bipole load prior to tripping was about 1400 MW. This led to increase in the loading of

parallel AC corridors.

As the 400/220/33 kV ICT 2 & 3 also tripped during bus fault, the ICT 1 and 4 got overloaded

resulting in load trimming scheme stage-1 operation causing load loss of 328 MW.

After isolating fault, 220KV bus coupler was charged at 16:26 hrs and the rest of the

elements are charged one after other by 17:53hrs expect 50MVA 220/22KV BHEL transformer,

which was restored at 19:58hrs after replacing the suspension insulator string.



2.45. Grid Incidence at 765/400 kV Pune GIS sub-station on 11th may 2016

Prior to the event all lines and ICTs were in service at 765/400 kV Pune GIS Sub-station

and Bad weather condition (Wind and Rain) was prevailing near to Pune. On 11th May 2016, at

18:42 Hrs, 400 kV Pune-Pune GIS 2 circuit got tripped on Y phase to Earth fault, which was on

400 kV Bus 1 at Pune GIS.

After this, at 18:52 Hrs 400 kV Pune-Pune GIS 1 circuit tripped on Y phase to earth

fault which was on 400 kV Bus 2 at Pune GIS S/s. However, simultaneously 400 kV elements

from 400 kV Pune GIS also tripped on 400 kV Bus Bar protection for Bus 1. There was no

load/generation loss during the event.

Immediately restoration procedure was started by WRLDC with coordination of PGCIL

WR-1. And situation was made normal by 22:07 Hrs. The delay in restoration was due to

unknown reason for the tripping of Bus 1 at 765/400 kV Pune GIS S/s.

PGCIL may give the reasons for tripping of Bus 1 at 765/400KV Pune GIS S/s.




2.46. Grid Incidence due to tripping of 765 kV Sholapur-Raichur 1 & 2 on 18th May 2016

On 18th May 2016, during heavy rain, the 765 kV Sholpaur-Raichur 2 tripped at 16:56

Hrs. and 765 kV Sholpaur-Raihcur 1 at 16:57 Hrs. This resulted in interconnection of Southern

Grid via only 400 kV Kolhapur-Kudgi D/C circuit with NEW grid which is a longer path for

interconnection. Immediate steps were taken to restore these lines however, in view of WRLDC

for that the standing phase angle between 765 kV Sholapur and 765 kV Raichur has to be less

than 5 degrees. As the operator were taking action in this regard by increasing the generation in

southern region by HVDC power flow increment, there was sudden load throw off in Northern

region at 17:32 Hrs. due to Phase to phase fault near load center.

This has led to sudden increase in change of power flow and angle across Raichur-

Sholapur which crossed 72 degree and due to which synchronization of lines through auto

synchronization facility got delayed. However, the load restored quickly within 6 minutes and

angular separation of 765 kV Sholapur and Raichur reduced below 5 degree resulting in

restoration of circuits. During the event no SPS has operated in the grid.



2.47. Grid Incidence due to tripping of 765kV Wardha-Aurangabad 1, 2, 4 on 6th May 2016

On 6th May 2016, at 18:01 hrs, 765 kV Wardha-Aurangabad 1 tripped on Y-B phase to

earth fault. After this at 18:18 hrs, 765 kV Wardha-Aurangabad 2 also tripped on B Phase to

earth fault. During this period the 765 kV Wardha-Aurangabad 3 was out for controlling high

voltage. At 18:32 Hrs, while attempting the trial charging of 765 kV Wardha-Aurangabad 1, 765

kV Wardha-Aurangabad 4 circuit also got tripped from Aurangabad end. With this all four lines

between 765 kV Wardha and 765 kV Aurangabad were not in service resulting in rush of power

on the parallel 400 kV circuits.

At 18:37 Hrs, the circuit breaker at Aurangabad end was closed by the operator and the

circuit came into service. After this circuit 3 was taken back in service at 19:29 Hrs. However,

765 kV Aurangabad-Wardha 1 & 2 could not hold and patrolling instruction was given. During

the event, there was no load/generation loss.




2.48. Grid Incidence at 220/132 kV Miraj Sub-station, Maharashtra on 18th May 2016

On 18th May 2016, at 03:31 Hrs, B phase (SCT Make) PT of 220 kV Bus of 220/132 kV

Miraj sub-station got burst resulting in bus fault and tripping of all the elements from the Miraj

sub-station. This resulted in the blackout of Miraj and nearby area. Total load loss during the

event was 196 MW and quantum of energy unserved 529.2 MWHrs.

After isolating the 220 KV PT, normalcy was restored. The failed PT is replaced with

spare Mehru make PT on 19th May 2016.

MSETCL may kindly be seen that in November 2015, R phase PT has burst at the Miraj

Sub-station. Prior to that CT failure also occurred in Miraj in one of the line in October 2015.

MSETCL may analyze this and submit the details to WRLDC/WRPC.



2.49. Grid Incidence at 400 kV Mouda Sub-station on 5th May 2016

On 5th May 2016, at 18:53 hrs, 400 kV Mouda-Wardha 2 tripped on B phase to earth

fault at a location of 11.5 km from Wardha end. At 19:00 Hrs, 400 kV Mouda-Wardha 2 line

also tripped on R-B Phase to Phase fault at location of 18.5 km from Wardha end. Tripping of

both the lines resulted in isolation of Mouda from the grid and its blackout. With this Mouda 1 &

2 unit tripped and resulted in 555 MW of generation loss.

400 kV Mouda-Wardha 2 & 400 kV Mouda-Wardha 1 were restored on 5th May 2016, at

19:26hrs & 19:49hrs respectively. Mouda Unit 2 was restored on 06th May 2016 at 04:15 hrs.

Mouda Unit 1 was restored on 07th May 2016 at 07:35 hrs.



2.50. Grid Incidence at 400 kV Kalwa Sub-station on 12th August 2016

Prior to the event, outage was approved for PMU works on the 400 kV Kalwa-Padghe 2

circuit. On 12th August 2016, at 09:28 Hrs, while the hand trip command was given to this line

from Kalwa, its Y phase pole got stuck and remaining poles tripped from Kalwa end. The line

has also tripped from Padghe end on receipt of direct trip due to hand trip command.

Now as per the procedure, the operator should have isolated the faulty section of the

breaker by taking Bus 1 outage and opening of the isolators associated with the lines. However,

the operator has initiated the Bus isolator opening for the feeder while the Y phase remained in


service. Due to this as the Y Phase Isolator was opened at 09:40 Hrs, heavy arcing observed on

Y phase PG isolator & arc remained continued.

Further, due to heavy winds the arc got shifted towards adjacent R phase creating R-Y

phase to phase bus fault at Kalwa s/s. Due to the heavy arcing due to line charging current of 400

kV Kalwa – Padghe line (line length is about 54 km) bus fault has occurred at Kalwa s/s. This

has resulted into operation of bus bar protection relay for 400 kV Bus 1 and tripping of

associated elements.

During the event, there was no load or generation loss. Bus Coupler and 400 kV Bus 1 at

Kalwa were restored at 10:19hrs. 400 kV Kalwa-Pune was restored at 10:38hrs. 400/220 kV ICT

was restored at 2 10:50hrs. 400 kV Kalwa-Khargar was restored at 13:38hrs.



2.51. Grid Incidence at 400/220 kV Kolhapur S/S causing blackout of 400 kV Kolhapur

GIS, 400/220 kV Mapusa, 220 kV Mumewadi, Halkarni substations along with 220/132 kV

Goa System connected with Western Regional Grid

On 17th September 2016, High voltage scenario was prevailing in Southern Maharashtra

and Goa system during the off peak hours. In view of this, various 400 and 765 kV lines were

kept open prior to the event in the area to control the over voltage. Even then the voltages were

not in the limits and voltages of all 400 kV Nodes and 765 kV nodes in Southern Maharashtra

remain outside the IEGC Band. The voltage of 400 kV Kolhapur, 400 kV Karad and 400 kV

Mapusa even touched 436 kV, 434 and 437 kV respectively at 03:43 Hrs. As soon as the voltage

of Kolhapur touched 440 kV, the overvoltage relay of 400 kV Karad-Kolhapur 1 and 400 kV

Kolhapur-Sholapur 1 has picked up at Kolhapur end.

At 03:43:03 Hrs, 400 kV Kolhapur-Sholapur 1 tripped on overvoltage protection from

Kolhapur end and the direct trip was sent to Karad end. Even after tripping of this line, the Karad

voltage remained very high and over voltage relay of 400 kV Karad-Kolhapur 1 did not reset.

At 03:43:07 Hrs, 400 kV Karad-Sholapur 1 also tripped from Kolhapur end and DT was

sent to remote end. However, at Kolhapur end its B phase pole re-strike happened causing its

failure. This led to fault in the B phase in the system. However, there was no direct ground

involved during the fault as intimated by the substation. But the attached DR of this line in the

annexure indicate the presence of ground in the fault with neutral current flowing through earth

being equal to the fault current i.e. 3.63 kA. It is also observed that the fault was of resistive


nature leading to the high current with the low voltage drop during the event. As the pole burst,

the fault was persisting and it was to be cleared by the bus bar protection at 400 kV Kolhapur.

Although, this fault due to breaker failure should have been detected by the Bus bar

protection as observed from the current in the faulty circuit, Bus bar protection failed to operate

at 400 kV Kolhapur. Report from MSETCL is indicating that the bus bar failed to operate due to

the absence of differential current in the system. This persisting earth fault was being observed

by the backup protection system from remote end substation. This led to tripping of 400/220 kV

Kolhapur ICTs on backup protection followed by tripping of 400 kV Kolhapur GIS-Kudgi D/C

and 400 kV Kolhapur GIS-Mapusa 1 on directional earth fault from Kudgi and Mapusa

respectively.

Along with this, 220 kV Kolhapur-Mudshingi 1 tripped on Non -directional overcurrent

protection from Kolhapur and 220 kV 220 kV Kolhapur-Mudshingi 2 tripped on directional

Overcurrent and E/F protection from Mudshingi end.

After the above, 220 kV Kolhapur-Hamidwada tripped from Hamidwada end on Non-

directional overcurrent protection. With this Complete load of Goa along with 220 kV

Substation of Mumewadi, Halkarni, Mahalaxmi and Tillari got shifted on 220 kV Mudshingi-

Belewadi-Mumewadi circuit.

After this, 220 kV Belewadi-Mumedwadi circuit tripped from Belewadi end on

overcurrent protection causing islanding of the 220 kV Mumewadi, Halkarni substations along

with 220/132 kV Goa System from the rest of grid and their blackout due to low generation-high

load island formation.

With this around 200 MW load of Goa, 18 MW load and 16.8 MW Generation in

Maharashtra got affected. The generation affected are Mahalaxmi generation (8. 8 MW) and

Hemrus Sugar generation (8 MW) in Maharashtra.

Immediately after the blackout, the allocation of Goa from SR was increased from 95

MW to 145 MW with the consent of SRLDC/Karnataka to meet essential VVIP, Domestic,

Water Supply and Hospitals. Loads were dirstributed equally to North/Central Goa stations viz

50 MW to Xeldem, 15 MW to Verna, 50 MW to Ponda, 15 MW to Kadamba, 15 MW to Tivim

and 5 MW to Amona.

Initially when 400 kV Kolhapur Bus was charged by taking 400/220 kV ICT 3 at Kolhapur

(220 kV Kolhapur system was in service), It led to charging of 400 kV Kolhapur-Kolhapur GIS

2, 400 kV Kolhapur GID-Kudgi D/C (up to Kudgi) and 400 kv Kolahpur GIS-Mapusa 1(up to

Mapusa end) resulting in high voltage at open end and tripping of all these feeders on


overvolatge. 400 kV Kolhapur GIS-Kolhapur 1 did not trip. Subsequently 400 kV Bus was again

discharged at 04:21 Hrs. It was again charged at 04:39 Hrs.

After this restoration to restore Southern Maharshtra was also undertaken and 220 kV

Downstream network from Kolhapur and Mudshingi to Mumewadi and then to Halkarni were

restored one by one. Further, 220 kV Tillari-Amona and 220 kV Mahalaxmi-Amona were

charged, however these lines could not be restored due to prevailing high voltages.

Subsequently, after controlling the high voltage at these substations, lines were synchronised

followed by taking the loads. By 06:32 Hrs, the complete supply was normalised for the Goa

system.

The report received from WRLDC along with DR received from various utilities was

enclosed in annexure 2.51.


D. OCCURANCES IN CHATTISGARH SYSTEM

2.52. Grid Incidence at Korba, Korba West, Korba East and nearby on 17th May 2016

On 17th May 2016, Due to Bad weather (Heavy rain and thunderstorm) In the Korba

district of Chhattisgarh, many of the lines tripped on single phase fault.

At 05:23Hrs, R phase to earth fault followed by Y phase to E/F occurred on the 400 kV

Korba-Bhilai 1 circuit. At 17:24Hrs, B phase to Earth Fault on the 400 kV Korba-Raipur 4

circuit and lines got successfully reclosed from both ends. However after 3.394 sec, the fault

reappeared in B phase and line got tripped.

At 17:33hrs, R phase to E/F occurred on the 400 kV Korba-Korba West circuit and line

tripped. A/R could not be confirmed but lines successfully reclosed at both end as intimated by

the sites. Fault location was 3.81 km from Korba end. At 17:41hrs, B phase to earth fault

occurred on the circuit and line successfully reclosed at Korba end however tripped from Korba

west end.

At 17:38hrs Y phase to E/F occurred on the 400 kV Korba-Balco circuit. However, Fault

was also in the B phase as observed from DR. The Fault current in Y phase was double of the

fault current in B phase so relay at Korba as well as Balco has sensed only as Y phase to E/F. No

A/R has occurred from either of the ends. Balco end DR is attached in annexure 2.50, however it

is not time synchronized. From Balco end it initiated the A/R cycle however did not take reclose

attempt and tripped after 7 seconds on DTT command.


At 17:41Hrs, R Phase to earth fault occurred on the 400 kV Korba-Sipat circuit. The line

tripped without attempting A/R. 400 kV Korba West Ext-Bhilai 1 lines has tripped at 17:33 Hrs

on R phase fault at the same time as of first fault observed on 400 Korba-Korba West circuit in

its R phase. 400 kV Korba West-Marwa 1 lines tripped on B phase to earth fault. A/R is not

observed from one or both ends.

Along with several 400 kV lines from Korba and Korba West tripped along with few

220 kV lines following which one unit each of Korba east & Korba east extension tripped.

Further with overloading of lines from Korba sub-station, Generation was in its units. Total

generation loss due to unit tripping at Korba east and Korba east Extension 300 MW.

Expect 220 kV Korba East – Korba West I/C 1, which is faulty. Most of the elements are

restored by 21:22 hrs.



2.53. Grid Incidence at 400/220 kV NSPCL Bhilai on 21st April 2016

On 21st April 2016, At 19:52 Hrs, R phase to earth fault occurred in 132 kV Bus of the

captive Power plant of BSP due to failure of 132 kV R phase CT of Bus coupler, situated in 132

kV Switchyard of BSP-2 Plant. As the fault was not cleared from the 132 kV side, it went on to

feed from the 220/132 kV ICT and further from 220 kV bus from BSP to NSPCL Bhilai though

interconnecting circuits. As the 220 kV ICTs and Interconnecting circuits were not tripping, it

resulted in protection operation of 220 kV NSPCL-BSP 3 and NSPCL-BSP 1 circuit which were

on the 220 kV Bus 1 at NSPCL Bhilai.

However, during the opening of 220 kV NSPCL-BSP 3 circuit from NSPCL end which

was on 220 kV Bus 1 at NSPCL, its breaker LBB protection operated which gave trip command

through bus bar protection resulting in tripping of 220 kV Bus 1 and connected elements. With

these, the Interconnecting NSPCL-BSP 1, NSPCL-BSP 3, Station Transformer 1 and 400/220

kV NSPCL ICT 2 tripped. This led to overloading of 400/220 kV ICT 1 at NSPCL which

tripped after one hour on overcurrent protection. There was no load/generation loss during event.



2.54. Grid Incidence at 220/132 kV Urla, 220/132 kV Bhilai on 3rd June 2016

On 3rd June 2016, at 02:08 Hrs, due to tripping of 132 kV Urla A-Birgaon circuit on R

phase -B phase fault, load at Urla got shifted to 220/132 kV Bhilai sub-station causing tripping


of 220/132 kV, 160 MVA ICT on overload and loss of the load from 132 kV Birgaon,

Gudhiyara, Sarona and Urla sub-stations. The load loss during this event was around 207 MW as

per WRLDC SCADA.

The remaining loads were being fed from other 220/132 kV, 125 MVA ICTs and

220/132 kV ICTs at Urla. At 02:20 Hrs, 132 kV Bhilai-Urla C circuit tripped from Bhilai end on

overcurrent protection operation followed by overload tripping of 220/132 kV, 125 MVA Bhilai

MVA ICT- 2 at 02:50 Hrs. This has caused load loss of around 141 MW as per WRLDC

SCADA.

At 03:05 Hrs, when the 132 kV Urla A-Birgaon faulty feeder was trail charged, it again

tripped on persisting fault. However at the same time, all the three 220/132 kV ICTs at Urla also

tripped. This caused further load loss of 130 MW in the area.

The total load loss due to interruption of load in the in Urla and nearby areas was 323

MW. The total energy unserved during the whole event is 554 MWHr. Normalcy in the system

is restored by 03:50hrs.



2.55. Grid Incidence at 220/132 kV Raigarh Sub-station on 21st April 2016

Prior to the event all the elements from 220/132 kV Raigarh Sub-station were in service.

220 kV Raigarh is having a double Main and transfer Bus scheme. There was no 220 kV Bus

protection scheme at Raigarh sub-station so any fault on the bus will be cleared by the remote

end/backup protection of the connected elements.

On 21st April 2016, At 20:58 Hrs, High Bus Jumper between 220 kV Main Bus-1 and

220 kV Main Bus-2 isolator of 220 KV Raigarh-Raigarh (PG) 2 circuit snapped with heavy flash

over. Due to this 220 kV bus fault (whether fault was on both or only one bus was not explained

by CSPTCL) occurred at 220/132 kV Raigarh Sub-station.

With this, total interruption of supply at 220/132 kV Raigarh S/s along with 220 KV

Saraipali, 220 KV Gerwani and 132 KV substations of Raigarh-Sarangarh, Baramkela,

Gharghoda, Patthalgaon, Jashpur, Chaple and Adbar occurred.

This has led to total load loss of about 289 MW. Most of the elements are restored by

22:55hrs.




E. Miscellaneous Items

2.56. Demand Crash in Madhya Pradesh and Chhattisgarh

In the afternoon hours of 21th May 2016 heavy rains prevailed in eastern part of Madhya

Pradesh and Chhattisgarh demand crashed by around 1200MW and 1000 MW.

Western Regional demand gradually reduced from about 41300 MW to 38900 MW due to rains

and further reduced during evening hours (17:00 HRS-18:00 HRS) to 36000 MW as normal

trend.

No Generating units tripped, No power interruption took place. Several lines tripped on

faults which are enclosed in annexure 2.56.


ITEM NO. 3: Tripping of lines / ICTs :

The minor incidences of tripping of lines and ICTs during the period 01-04-2016 to

30-09-2016 are enclosed at Annexure–3.

All utilities shall furnish the single line trippings & minor trippings to WRPC and

indicate whether A/R is provided at both ends of the line or not. Also it shall be reported as to

whether the A/R operation was successful for transient faults or not and whether A/R is locked

out for permanent faults on the lines or not. Constituents shall provide A/R availability/status for

each line at both ends.

Committee may like to discuss/note.

ITEM No. 4 : Multiple tripping of evacuation lines at CGPL(Leading to tripping 4x830

MW generators) and 400 kV lines at 400 kV Bachhau S/S.

A complete blackout at CGPL took place on 13.07.2016. A group comprising of CGPL,

GETCO, Powergrid WR-II, WRLDC and WRPC representatives met at Vadodara on 18.07.2016

to discuss the blackout. Later in the 127th PCM, Committee suggested that CGPL, GETCO,

WRLDC will form a group to study the power swing phenomenon observed in the CGPL

system. CGPL, GETCO and WRLDC were requested to send the details of the incidental system

before the occurrence and relevant tripping data (DRs, PMU recordings etc.) to WRPC. Based

on the discussions and details received, a report is prepared by WRPC and it is available in

WRPC website under PCM Minutes.

The following were the conclusions and recommendations based on report prepared by

group, which is put up to PCM for vetting.


1. RTV Silicone Coating of Insulators:

The bus fault at Varsana has occurred due to the insulator tracking and flashover

during foggy weather conditions with rains. PGCIL informed that flashover event could

be minimized if the hot-line washing and RTV silicone coating of insulators be

completed prior to the rainy season. Therefore sub-station falling under pollution

zone/saline zone should explore adopting best practices of hot line washing prior to rainy

season along with the application of RTV silicone coating to avoid such events in future.

Varsana is an important GETCO station connected to two large generation complexes.

GETCO may look into the possibility of RTV Silicone coating in such areas.

2. Charging of Dead Bus:

Dead Bus should generally be charged through a long line or through ICTs, so

that the fault currents are less. A Dead Bus, after bus fault, should not preferably be

charged through short line and lines having generator connected at remote ends of lines.

Also dead bus should not be charged through line having strong source at the other end.

Action: All utilities to please note for future.

3. Power Swing phenomenon

Prior to the event, the CGPL generation was around 2875 MW. During the event

CGPL Units had fed the three phase fault at Varsana for a duration of 350 ms. Along

with this event, three 400 kV lines also got tripped which was followed by a continuous

decline of voltage for 290ms. The voltage started rising, this was detected as a power

swing entering in zone-1 by the line DPS at CGPL end and the lines tripped.

The reasons for excitation of the oscillations need to be found out since these

oscillations were not damped out resulting in a severe power swing. A transient study by

modeling the proper network is required to done.

PCM may decide the modalities of carrying out these studies. The scope of these

studies shall be to examine the cause of power swing, various factors that

contributed to CGPL machines going Out of Step and suggest remedial measures.

4. Protection Coordination Issue in Zone 2

The Zone 2 settings adopted by CGPL for all the lines, at CGPL end is 300msec

and the remote end settings are 350msec. The adoption of 300msec for Zone 2 at CGPL

end is in view of stability of generating units and critical clearing time of faults. It was

noted that the 400kV Bacchau-Versana-1 & 2 lines are very short lines (8.5kM).

Therefore group recommended interimly that PGCIL may adopt 250msec for 400kV


Bacchau-Versana-1 & 2 and CGPL may adopt 350msec for time being, and afterwards

based on the studies for critical clearing time/stability of the generators for faults to be

carried out, it would be decided to raise the zone 2 time settings for these lines.

PGCIL/GETCO/CGPL in mutual coordination may set the relay settings as above. PCM

may vet these interim settings.

5. Permissive Trip Carrier being received as direct trip for 400 kV Bhachau-CGPL 1

at Bhachau end.

It was observed that the permissive carrier sent by CGPL for the 400 kV CGPL-

Bhachau 1 was received as direct trip by the Bhachau end. In view of this, end to end

testing of the Carrier signal has to be checked by the both utilities (CGPL and PGCIL) in

coordination with each other.

6. Bus configuration at 400 kV Varsana.

The elements should be distributed evenly on the buses (Bus A & Bus B) such

that these elements can be served optimally in the event of Bus faults to enhance the

reliability. The elements on Bus-1 & Bus-2 were not evenly loaded at 400kV Varsana

S/S. Therefore it is recommended that GETCO may explore how Bus configuration can

be changed such that, balanced loading on buses is achieved on both the 400 kV buses at

Varsana S/S.

7. SPS at CGPL :

As none of the criteria for CGPL operation was satisfied due to low generation at

CGPL, the SPS has not operated as per the design.

8. Loss of PMU data from CGPL:

After tripping of units & auxiliaries the PMU data was not available. It should be

ensured that the data from PMU should always be available.

Further in the report on similar blackout at CGPL in 2014 it was recommended

that the PMU installed on unit 40 does not serve any purpose in analysing such events

and therefore it was suggested that the same should be shifted on 400KV CGPL-

Bhachau line.

It is again recommended that the above should be done immediately.

WRLDC has also prepared a report on the incidence and the same is available on their website.

The report prepared by WRPC is enclosed at Annexure-4.



ITEM NO. 5: Hon’ble CERCs orders on the Grid disturbance of 30.07.2012 &

31.07.2012

5.1: Compliance Status observations made in Protection Audit (Petition No.

220/MP/2012) Back Ground :

Back ground : CERC vide its order dated 21.02.2014 in respect to petition No. 220/MP/2012

filed by POWERGRID have directed that CTU and SLDCs shall submit quarterly Protection

Audit Report to the respective RPC latest by 15thday of the first month of next quarter and

RPCs shall submit the report to the Commission latest by 15thday of the second month of next

quarter. The Member Secretary of Regional Power Committees shall monitor the

protection related issues and bring to the notice of the Commission any instance of non-

compliance of the Regulation 1.5 of the Grid Code in respect of the protection related issues

considered in the instant petition.

It was decided that all observations of protection audit would be classified as protection system

related i.e. Category A, Category B & system improvement related observations, would be

furnished separately and shall not be included in the list of category A or B deficiencies.

The updated status filed to Hon’ble CERC as on 31st July 2016 is enclosed at

Annexure-5.

All the constituents/Utilities are requested to submit the updated status regularly


5.2: Grid Disturbance on 30.07.2012 & 31.07.2012 (Petition No. 167/Suo-Motu/2012)

Back ground : Hon‟ble CERC‟s vide order dated 22.02.2014 in the matter of grid

disturbance occurred on 30.07.2012 & 31.07.2012 in petition No. 167/Suo-Motu/2012,

have made certain observations and issued directions.

According to this order, all the RPCs have to maintain the relay settings data of all the

ISTS lines and lines emanating from interface S/Ss of Utilities to ISTS (400 kV& above and

220 kV interfacing lines). Therefore all utilities were requested to submit relay setting data

to WRPC/WRLDC.

In 123rd PCM, committee requested all utilities to compile & maintain the data of their

system for voltage level of 132 kV & above. The relay setting data in respect of all 400 kV

lines and important 220 kV lines (interface lines with ISTS & lines connected to generating

stations) shall be submitted to WRPC/WRLDC. Committee requested WRLDC/SLDC to

collect and compile the data of all utilities under their control area and submit the same to


RPC. The data has been received from MP, GETCO and Maharashtra.

In 127th PCM, Committee requested all the utilities (PGCIL, CSPTCL, ISGS, Goa, and

DD & DNH) to submit the updated relay settings data to their respective SLDCs, WRLDC, and

WRPC at the earliest.

WRLDC/SLDCs may give status on the data.


5.3: CERC Order dated 05.08.2015 on draft protocol for checking protection settings and

its healthiness (Petition No. 009/SM/2015)

Back ground :

5.3.1) Background:

Hon‟ble CERC vide order dated 05.08.2015 in the matter of “following up actions on the

recommendations of CAC Sub-Committee on Congestion in Transmission” have

considered and accepted the Sub-Committees report and recommendations on measures to

reduce congestion in transmission for which actions need to be taken by CEA, NRCE, CTU,

POSOCO, POWERGRID, RPCs as well as CERC.

CERC, in its above order have directed Member Secretary (RPCs) as follows;

“Protection sub-Committee of RPC should bring out protocol for checking the settings,

ensuring healthiness of existing protection system and periodicity of carrying out this

exercise”.

The protocol formulated in the special meeting held on 16.10.2015 and 126th PCM was discussed

in detail in the 31st WRPC meeting and the committee approved the following:

5.3.2) 126th PCM & 31st WRPC meeting discussions : With regard to a new element

getting connected to CTU, CTU informed that they are already providing the settings. However,

for lines of CTU network not constructed by POWERGRID, this role will have to be played by

the line constructing entity. The revised network configuration which includes the next busses

along with the line length where a change in network has taken place should be given, so that

testing circles can set their distance relay reaches.

5.3.3) Protocol approved in the 31st WRPC meeting :

a) Protocol 1: (For overall settings) The proposer can either be Local/Field testing Engineers or

HQ and the approver for these settings can be HQ and Local/Field testing Engineers respectively.

These two should be different/independent groups.


b) Protocol 2: Review at site: Checking and validating of the settings be done once in a year

by testing/site engineer. OR Whenever a Grid Disturbance occurs, the relay settings of the

affected station and nearby station (where protection has mal operated) be checked thoroughly.

c) Protocol 3 : Database: Soft copies of the settings be available at the CTU/STU HQ and the

same be forwarded to SLDCs/WRLDC for voltage levels of 400kV & above and ISTS lines (of

all kV levels). A database of all the above elements be maintained at WRLDC/SLDC/WRPC (in

addition to being maintained by respective utilities for their systems).

d) Protocol 4: New Elements Integration: In case of new element to be synchronized first time,

the new element entity should get the settings certified/vetted (particularly the distance relay

reaches) by STU/CTU as the case maybe and forward the same to WRLDC/SLDC. The

parameters/fault levels regarding the incidental system to the new elements be provided by

CTU/STU as the case may be to the Utility proposing to connect the new element and the

settings arrived by the Utility be got verified from CTU/STU. For this the Utility proposing to

connect the new element shall approach CTU/STU as the case may be. The verified settings shall

be adopted by the Utility and same shall be communicated to WRLDC/SLDC as the case may be

and thereafter WRLDC/SLDC shall give permission for synchronization for such elements after

completion of all other formalities required as per regulations in vogue.

e) In case of any network changes, the revised network configuration (which includes the list of

adjacent busses lines and along with the line lengths of the network where a change in network

has taken place) should be given to the concerned testing circles/utilities/IPPs who can then set

their distance relay reaches as per the Ramakrishna Committee guidelines. For any

difficulty/ratification, the matter can be discussed in PCM forum of WRPC.

5.3.4) 127th PCM Discussions: In the 127th PCM constituents felt that since there would be

difficulty in following protocol 4 at d) and e) above, in the field, and therefore there is a

need to modify it slightly as follows,;

d) Protocol 4: New Transmission line Element Integration - In case of new transmission

line to be synchronized first time, the new element entity should approach respective

CTU/STU/concerned utility where it is getting connected, for getting the information of

Transmission Line(s) connected at that particular utility S/s(i.e remote s/s) , and the distance

relay’s settings and zone timings. The new utility shall then arrive at the settings for

distance relays zone reach and timings and for that it shall adopt the overall settings of

distance relay as per the Ramakrishna committee Guidelines. The zone timings shall have to

be suitably co-ordinated with the existing settings adopted in the next station.


The Bus fault levels regarding the incidental system to the new elements shall be provided

by CTU/STU as the case may be to the utility proposing to connect the new element.

These settings shall be forwarded to WRLDC/SLDC and with copies to

CTU/STU/concerned utility and WRPC. For doubts or disagreement, if any, the matter can

be referred to WRPC PCM, after adopting interim settings as above.

e) In case of any network changes such as due to (d) above or otherwise, the existing

utilities need to review the reaches and timings for the distance relay. For this the utility

whose substation configuration is getting changed due to the network change/ addition,

shall indicate to all remote ends and next to remote ends s/s the new configuration of

network along line lengths and their existing zone reaches and timings. It is then the

responsibility of all the utilities, to apply the reaches (as per Ramakrishna Committee

recommendations) and revised time co-ordinations for lines from their s/s for the changed

configuration. They shall follow the proposer/approver model as per Protocol (1).

5.3.5) The above changes suggested by PGCIL in the 127th PCM were put up in the 32nd

WRPC meeting:

In the 32nd WRPC meeting, PGCIL representative informed that CTU did not

want to own the responsibility of validating or vetting the settings. The settings have to be

implemented as per Ramakrishna Committee recommendations and it is the responsibility of

the entity to set its relay settings. Hence they had requested the modification. CTU did not

have any issues in giving relevant data. Vetting should be done by PCM.

It was clarified that perhaps the protocol 4 is slightly misunderstood by CTU. The scope is

not as wide as CTU is envisaging. Consider a new entity getting integrated or a new line

getting LILOed at a station. This will call for a change in distance relay settings especially

for Zone 2 and Zone 3. Hence Protocol 4, now envisages in a detailed manner what data

shall be provided by whom. It is clear that the responsibility of adopting a setting in line

with Ramakrishna guidelines rests with the utility, for which he should be provided

with the data. The utility shall accordingly set the relays, and the CTU or STU will

play an advisory role on the settings adopted by the incoming utility for only for the

interim period(from the time the utility comes till the next PCM), which is usually a

maximum period of 3 to 4 months. Further if it is not a new utility, then existing

STU/CTU/utilities are responsible for their jurisdictions. By such discussions on the

settings, many incidents could have been minimized/avoided as seen in the PCM minutes.

Once the PCM vets, the interim advisory role of CTU/STU is over. If it is required very


urgently for complicated settings changes, then a small group of PCM members can

specially meet and decide the interim settings and put up in the next PCM. The whole idea is

to guide a new utility to adopt the Ramakrishna guidelines properly and allow flow of

information.

The above was agreed in the 32nd WRPC meeting.

Protection sub-Committee may note.

ITEM NO. 6 : Proposal for revision in relay settings.

6.1) Proposal for revision in relay settings for lines emanating from 400kV CGPL UMPP.

A proposal for revision of relay settings for lines eminating from CGPL UMPP was

forwarded by CGPL vide email dated 13.10.2016, after incorporating the observations made

by GETCO. The proposal was sent for vetting to CTU, PGCIL and GETCO, in line with the

decision in 32nd WRPC meeting vide email dated 25.10.2016, with a reminder on

11.11.2016. GETCO have confirmed that the observations made by them were incorporated

by CGPL. However no communication was received from CTU & PGCIL.

The CGPL proposal is enclosed at Annexure-6. Letter received from CGPL is

enclosed at Annexure- 6.

Committee may like to discuss and approve the settings.

6.2) Updating the status on relay co-ordination in Akola area of MSETCL:

A report on disturbance on 29.03.2015 at Akola S/s was circulated vide letter dated

02.11.2015 and discussed in the 126th PCM.

The recommendation pertaining to relay co-ordination in Akola area of MSETCL is as

follows;

The system near about Akola (Akola, Wardha, Koradi, Chandrapur, Khaparkheda&

Aurangabad) is complex and have many complexities as regards to Main/Backup

protection settings. A coordinated setting of Main/backup relays at the complex of Akola is

required to be arrived at, considering the In-feed/Out-feed effect by simulating faults at

various locations. Hence the traditional/Ramkrishna Committee recommendations would be

required to deviate. PGCIL, Maharashtra STU, M/s MEGPTCL and Indiabulls

representatives in co ordination with WRLDC & WRPC may sit together and decide proper

settings.

PGCIL, MSETCL may update the status.

Committee may decide the members for the group.


ITEM NO. 7: Status of implementation of recommendations of Report on Grid disturbance

on 30th and 31st July 2012 in WR.

Back ground:

An enquiry committee was set up under the chairmanship of Chairman, CEA to

enquire into the grid disturbance on 30th& 31st July, 2012 in NEW grid. As per the

recommendations of this committee, all utilities/SLDCs/RLDC were required to submit updated

status on implementation of recommendations made by the committee to RPC on

1st& 15th of every month and the same has to be sent to CEA by RPC by 3rd& 17th of every

month.

The nodal officers responsible for submission of data to RPC were already identified and were

requested to forward the data regularly for onward submission of the same to CEA/MoP. In a

special meeting held on 18.12.2014, it was decided that the status shall be submitted year wise

separately for FY 2012-13 & 2013-14 and the data may be furnished on quarterly basis

for April – 2014 onwards. In the 123rd PCM, Committee observed that there were

discrepancies or mismatch in respect to protection audit data furnished by utilities for

submission to CEA in format and to CERC in format. It was opined that to have a clear picture

of implemented status on above recommendations in respect of protection audit, utilities may

submit the consolidated and detailed status of all 132 kV, 220 kV, 400 kV and 765 kV S/s. It

was also felt that SLDCs and WRLDC would coordinate to get the details.

A special meeting was held on 16.02.2016 to discuss the above issue.

The updated position is enclosed at Annexure-7.

Item No. 8: Task Force report

8.1 : Report of the Task Force on Power System Analysis Under Contingencies:

Ministry of Power, GoI constituted a “Task Force on Power System Analysis under

Contingencies”, in December 2012 under the chairmanship of Shri V. Ramakrishna as per

the recommendation made by Enquiry Committee headed by Chairman, CEA on grid

disturbances that took place in NEW grid on 30thand 31stJuly 2012. The terms of reference

of Task Force broadly cover analysis of the network behavior under normal conditions and


contingencies, review of operational philosophy of protection relays, review of islanding

schemes and technological options to improve the performance of the grid. The report of the

Task Force was discussed briefly in 122nd

PCM and subsequently discussed in detail in a special

meeting held on 18.12.2014. Thereafter the recommendations were discussed in the previous

PCMs. A brief on suggestions given by Ramakrishna Committee, discussions/observations of

the group and PCM are as follows.

1) Review & correction of relay settings:

Zone-1 PSB: The task force recommended to trip the line, if power swing enters Zone – I

Characteristics and block tripping for other zones during power swing.

Decision in PCMs : All existing relays may not have feature of delayed tripping for one zone &

blocking for other zones i.e. delayed tripping for Z-I and blocking for Z-II & Z-III, hence all

utilities shall instantaneously trip for Zone – I power swing and block the tripping for power

swing in other zones(Z-II & Z-III). Specific stations where this is not possible may be identified

and put up in the next PCM.

In the 125th PCM & 126th PCM, PGCIL, MPPTCL, CSPTCL, GETCO and MSETCL

representatives intimated that there settings(PSB) are in line with above recommendation.

NTPC representatives intimated that power swing is blocked for 2 secs for all 3 zones i.e. Z-1,

Z-2 & Z-3 and if power swing still persist the relay will trip for all 3 zones.

NTPC may update the status on the above.

2) Formulation of Special groups for studies and protection coordination:

The Task Force recommended forming a group for studies, protection coordination and relay

settings. It also recommended that each utility should establish a protection application

department with adequate man power & skills. The members of protection team shall

undergo regular training to enhance their skills.

Contingency and Stability Studies: The Task Force recommended to form a special

group to analyze the grid conditions and factors affecting its operation and simulation of critical

system conditions expected for forthcoming season on regular basis and suitable operational

strategy worked out.

Tuning of power electronic devices & PSS: The Task Force recommended carrying out studies

& reviewing the network at regular intervals (3-4 years) with introduction of newer power

electronic devices. The results may be implemented within next 3-4 years. It also suggested that

as this requires specialized dynamic modeling, the task may be entrusted to reputed independent

agency and implementation of tuning be entrusted to respective manufacturer.


Decision in 127th PCM: It was decided that MSETCL, GETCO, CSPTCL, MPPTCL, WRLDC,

POWERGRID and NTPC would nominate one member from studies side and one member from

protection side and send the name of the members to WRPC for carrying out studies mentioned

above. It was also decided that SLDC would give PSS details format for state generators,

WRLDC for IPPS and NTPC for their generators.

SE (protection), WRPC intimated that in view of the above decision, a group was formed and a

meeting of the group was held at WRPC on 22.04.2015. Following was decided in the meeting;

(i) Operational & Off line Studies: It was decided to update the PoC Q4 case of 2014-

15 with the actual network and set this as a starting point. All utilities would furnish the bi-

monthly data of planned network, planned generation and anticipated load generation for

the period upto March 2016. The study group after updating the network and receipt of the

forecast data would take up the operational planning studies.

(ii) Transient Stability & Short circuit Studies: Utilities would furnish the machines transient

data of their system, wherever data is not available the same shall be assumed as per CEA/CBIP

manuals. Training on the same could be arranged with IIT-B.

It was decided that two subgroups could be formed to look into the above

recommendations. One subgroup would be headed by Shri R H Satpute, SE (Testing

Division – Vashi). This sub group would review the protection system in WR and coordinate the

relay settings as per the Ramakrishna recommendations. The other subgroup would be headed by

Shri Satyanarayan. S, SE (P&S), WRPC. This subgroup would carry out studies required for

coordination of relay settings.

iii) In house training:

Task force strongly recommended that a dedicated group is required to be trained in all utilities

to carry out computer aided studies for relay settings. It was felt that knowledge sharing sessions

/ discussions, in house training on the fundamentals of load flow studies, contingency studies,

stability studies etc.., may be shared with the system study engineers of utilities of WR.

iv) Training by IIT: In order to build a strong team of WR in specialized areas of studies,

training sessions may be arranged to team members at IIT Bombay on relevant specialized areas

subjects like transient stability, PSS tuning, tuning of FACTs devices, SSR etc..,

vi) On line studies & State Estimation: An update on the online studies (Online state

estimation and contingency rankings etc) being carried out by utilities was updated as regards to

packages available with them and online studies conducting at their end.


WRLDC representative informed that in compliance to recommendation 10.1.2 of Rama

Krishna committee on Task Force on Power System Analysis under Contingencies, WRLDC is

operating Real Time Security Desk in Control Room since June‟14 with an officer

c o n v e r s a n t with s y s t e m s t u d i e s through PSS/E software and knowledge of

SCADA/EMS.

Presently WRLDC and SLDCs are upgrading the SCADA/EMS system. In this new

SCADA / EMS system complete network model of Western Region would be incorporated

which would result in effective utilization of State Estimation in real time. In the upgraded

SCADA/EMS, the plan is to run state estimation along with contingency analysis in real time

and integrate PMU data with new SCADA/EMS system which would improve observability of

network.

MSETCL representative intimated that earlier MSETCL was carrying out online studies on

Seimens State Estimator software but due to increase in network complexities and

constraint with existing S/W package, these studies were discontinued. It was intimated that

very soon MSETCL would be shifting to new S/W package, through which online studies could

be carried out.

GETCO, CSPTCL & MPPTCL representatives intimated that they are not performing online

studies.

Committee may like to discuss/note.

8.2 : Meeting for appointment of consultant-A to conduct the study/analysis to

ensure secure and reliable operation of national grid:

In compliance to MoP order dated 16.07.2014, the process of appointment of

consultants to conduct the study/analysis to ensure secure and reliable operation of national

Grid, has been under taken by CEA. A meeting to decide the data/inputs for the consultants was

held at CEA on 22.05.2015 under the Chairmanship of Member (GO &D), CEA.

Following issues pertaining to protection and system studies and actions required by RPCs and

constituents were discussed in the meeting:

(i) The Grid Study Committee will be chaired by Member (GO&D), CEA.

GM,NLDC, POSOCO will be the convener. MS RPCs will be the members. One STU from

each region would be nominated as member for the committee on rotational basis.

(ii) Identification of 25 nos of critical S/Ss in WR (already audited) for review of

protection audit and setting of protection relays thereof. The consultant would carry out


Protection Audit and review the protection philosophy adopted.

(iii) Substation wise protection audit reports in respect of all the substations audited in the

FY 2012-13.

(iv) Nomination of nodal officers from all power sector entities. A CE level officer from

each STU shall be appointed by each State/UTs to co-ordinate with SLDCs. Monthly meeting

will be held on VC.

From WR, CE, STU, MSETCL was nominated for the grid study committee. WRLDC

identified 25 critical S/s (already Audited) of WR and the same were forward to Grid Study

committee, CEA.

Accordingly M/s Tractable was appointed as consultant. A meeting of WR

constituents was held on 12.08.2015 at WRPC, to collect the data required by the consultant.

The consultant M/s Tractable commenced the work under Task-I in August 2015. 256 S/S

protection audit reports were forwarded to M/s Tractable and they have completed the scrutiny

the protection audits reports for these S/Ss.

The Task-II for review of protection audit and protection relays thereof for 25

critical S/Ss commenced in December 15 and they have almost completed the Task-II and

have recommended revisions in setting of the stations where protection audit has been

carried out by them. WRLDC may update the status.

NLDC has organized training on power systems for 5 days by the international

consultant (M/s Tractebel), at WRPC Mumbai. The training program is scheduled from

09th January 2017 to 13th January 2017.

WRPC vide letter dated 14th October 2016 has requested to nominate protection

engineers for the above training. However, as on date, nomination has not been received

from any of the constituents. Utilities may give nomination of their representatives for this

training program so that the same can be conveyed to NLDC.


ITEM NO. 9: LINE DIFFERENTIAL PROTECTION FOR SHORT LINES:

CEA vide letter dated 27.10.2016 (copy enclosed at Annexure-12.2) have requested that

the recommendation of the sub-Committee on Relay/Protection under task force for Power

System Analysis under contingencies on transmission lines having OPGW or separate OF laid

for communication shall have line differential protection as Main-I protection with distance

protection as backup (Built in Main relay or standalone) and Main-II shall continue to be used as


DPS. Auto reclosure shall be blocked for faults in the cables. Further CEA has requested to

deliberate the matter in PCMs of RPCs.

WRLDC vide letter dated 12.10.2016 have intimated that several Grid incidences

occurred in the recent past due to problems in the distance relay setting coordination of long

lines followed by short lines, i.e. tripping of longer lines in zone 2 prior to tripping of short lines.

A list of short 765 and 400 KV lines with the line length less than 50 Km in WR has been

prepared by POSOCO and the same is enclosed at annexure-8.

Utilities concern may bring the Main-I & Main-II protection employed for the lines

at both ends and plan for replacement of Main-I relays as above for the lines in Annexure-

8. Also the feasibility of providing Main-I as differential protection on lines having FO for

other lines be furnished in the PCM.


ITEM NO 10: COMMISSIONING OF NEW SYSTEM PROTECTION SCHEMES IN

CONNECTION WITH SYNCHRONIZATION OF SR AND NEW GRID

1)Revision in SPS : With commissioning of 765kV Kolhapur-Kudgi (PG) D/C (initially charged at

400kV), revision of SPS and the present status of implementation of the SPS by various agencies

involved was communicated by NLDC vide letter dated 23.12.2015. NLDC vide letter dated 16th

March 2016, superseding all the previous communications in relation to the NEW-SR SPS have

intimated revision in the SPS on NEW-SR corridor for implementation.

2) 31st WRPC meeting deliberations:

WRLDC representative stated that all the revised NLDC SPS has been implemented except

generation back down & load shedding of 200-300MW in Maharashtra envisaged at SPS-5 and load

shedding of 200-300MW in Maharashtra at SPS-6. As regards to SPS-8, the tripping of bus reactor

at Pune (PG) and Parli (PG) has not been implemented as directed by NLDC/WRLDC, since these

reactors are in the same dia of other important elements.

CE, SLDC, MSETCL, informed that they do not agree for generation backing down at Koradi-

70MW, Chandrapur-250MW and Khaparkheda-150MW for SPS-5 (Tripping of one ckt of 400kV

Wardha-Parli D/C and flow on other circuit>750MW). He further informed that backing of

generation at these places in Maha Genco, has not be shown to be effective. Hence he requested

that these should be dropped. However as per the SPS-5 backing down at APL Tirora-200MW;

Mauda-100MW, IB-30MW may be retained. Hence he requested that SPS-5 and SPS-6 requires to

be revisited. As regards to addl 200-300MW LS in Western Maharashtra, they would instead pick

up generation at Koyna.


MS, WRPC informed that SPS has to be followed by all. These SPS are designed to save the grid in

case of critical contingencies. GM, WRLDC informed that the chances of SPS-5 getting operated is

less due to expansion of network and commissioning of Aurangabad-Solapur D/c. CE, SLDC,

MSETCL informed that the SPS for tripping of Aurangabad-Solapur D/c is already there and

therefore SPS-5 becomes redundant. Hence there is a strong need revisit the SPS-5.

MSETCL was suggested to give their concerns to WRPC and the same would be taken up with

NLDC, since the SPS has been proposed by NLDC.

3) 127th PCM Discussions :

The matter taken up by MSETCL with NLDC and reply of NLDC was discussed in the PCM and

MSETCL representative stated that NLDC have proposed a meeting to resolve the issue.

4) 32nd WRPC meeting discussions:

It was informed that MSETCL had raised several concerns about SPS-5 and had written to

NLDC. The reply of NLDC was also discussed in the PCM and NLDC had proposed a

meeting to resolve the issue. CE,SLDC, MSETCL informed that various concerns of

MSETCL on SPS-5 and a meeting with NLDC and other stakeholders was already proposed

and the same shall be discussed at that time.

WRLDC/MSETCL may like to update the status

ITEM NO 11: IMPLEMENTATION STATUS OF SPS

11.1) SPS for 765 kV Bina – Gwalior – Agra: An SPS has been implemented for Bina–

Gwalior– Agra D/C, wherein when sudden reduction in import by NR on Agra-Gwalior I & II

ckts by more than or equal to 1500MWs, 500MWs generation back down in WR (KSTPSNTPC–

120MWs,VSTPSNTPC–200MWs&CGPL –180MWs)and load shedding in NR would take

place.

11.2)Revision of SPS: NLDC vide letter dated 07th Sept.2015 intimated that with

commissioning of 765kVGwalior-Phagi D/C & 765kV Phagi-Bhiwani, the SPS margin of

1500MW on 765kV Gwalior-Agra D/C was increased to 3000MW. Generation backing down

quantum in WR increased from 500MW to1000MW and load shedding in NR was also

increased. In addition to NTPCKSTPS, NTPC-VSTPS&CGPL stations, SASAN UMPP has also

been included in the SPS for a total backing down quantum of 1000MW.

Subsequently, the SPS signal was wired up to SASAN through PLCC channel and the backing

down at NTPC-KSTPS, NTPC-VSTPS, CGPL and SASAN was revised to250MW.


The mock testing of the SPS was carried out on 12.05.2016 and during mock testing, a signal

for loss of 1500MW was generated at Agra end and receipt of the same at VSTPS,CGPL and

KSTPS was confirmed by WRLDC vide their letter dated 18.05.2016. Further it was informed

that the SPS signal did not get extended to SASAN, since it was generated from Agra end

which has FO connectivity.

11.3) WRPC vide letter dated 23.05.2016 (enclosed at annexure 20 ) took up the matter with

NLDC/WRLDC as the setting for loss of import on 765kV Agra-Gwalior D/C lines, is still

kept at 1500MW.

Further it was requested to confirm implementation of SPS as per NLDC letter dated

07.09.2015 and it was suggested that in case the revision in SPS is not carried out as per letter

dated 07.09.2015 at Agra end, the WR generating stations, VSTPS, KSTPS, CGPL and

SASAN may please be advised to set their backing down quantum to 125MW from 250 MW

each(the present backing down quantum implemented for this SPS is 250MW each) and

PGCIL be advised to retain the original setting of 1500MW(which at present is set at

3000MW) at Gwalior end for 765kV Agra-Gwalior D/C lines SPS.

11.4) In the 127th PCM it was informed that the above has not been implemented. PCM

suggested to implement the above modifications in SPS till the SPS is implemented in NR and

at Agra end..

In the 32nd WRPC meeting PGCIL informed that PGCIL has revised the settings at Gwalior

end (to 1500 MW) and tested locally. Fiber optic cable laying to Sasan is in process and

expected to be completed by September 2016. CGPL has implemented 125 MW backing

down. Other generators shall also implement 125 MW each (Total 500 MW till NR

implements their portion after which it will come back to total 1000 MW)

WRLDC may like to update on the above.

Committee may like to note.

ITEM NO 12: ISLANDING SCHEMES:

12.1) Islanding scheme for Sugen:

In the 124th

PCM, WRLDC representative intimated that a meeting was held at

WRLDC, Mumbai on 16.04.2015 to finalize the islanding schemes of Sugen and the proposal

was discussed in the 126th & 127th PCM. However due to unavailability of Sugen representative

the Islanding scheme could not be finalized.

In the 127th PCM, GETCO representative stated that they have completed the necessary work at

their end and requested that TPL may inform the status on the same at their end. Accordingly


WRPC took the matter with TPL and subsequently a meeting was held at Sugen Surat on

07.11.2016 and the Islanding scheme was discussed in detail.

10.2) The brief on the proposed Islanding scheme was as follows;

SUGEN switchyard consists of the following:

400 KV switchyard – 2 Main Bus and 1 Transfer Bus

3 x 382.5 MW Generators

400kV Sugen-Vapi Line (PGCIL)

400kV Sugen Jhanor Line (PGCIL)

400kV Sugen-Unosugen line (TPGL)

400kV Sugen-Pirana Line (TPGL)

220 KV switchyard – 2 Main Bus

220kV TPL Surat Bhatar Feeders – 2nos.

220kV TPL Surat Ved Feeders – 2nos.

220kV TPL Surat Puna Feeders – 2nos.

220kV TPL Surat Bhatar Feeders – 2nos.

220kV Gensu Feeders- 2 nos.

400/220 KV Interconnecting Transformers (ICTs):

315 MVA ICT – 3 nos.

Surat Load of around 630 MW consists of load on Surat-Ved,Surat-Bhatar and Surat-

Puna Lines (220 KV D/C lines).

Islanding of SUGEN with Surat load is designed as follows:

1. 48.5 HZ: 220 KV Sugen-Kim line and Gensu line D/C will be tripped

2. 48.4 HZ: Load-Generation balance to be monitored with respect to 220 KV feeders for

Surat City and Generation at Sugen. If generation is more than Surat Demand, the

adaption Logic will Trip the Unit/ST or various combinations of Units/ST to reduce the

load-Generation difference.

If Surat Load is more than Generation, Load shedding PLC Logic will Trip the

Substation Breakers at 66 KV level as per Priority Logic.

3. 48.2 Hz: 400 KV Sugen-Pirana and 400 KV Sugen-Vapi (PG) to be opened in first phase

one by one. Fine frequency tuning would be intimated by Sugen at the time of

implementation.


4. 48.0 Hz: 400 KV Sugen-Unosugen and Sugen-Gandhar (Jhanor) line have to be opened

in next phase resulting in islanding of Sugen with Surat load. Fine tuning of frequency

would be intimated by Sugen at the time of implementation.

10.3) Observations made during meeting held on 07.11.2016 :

1) It was suggested to open the 400 KV Lines in sequence before opening the 220kV

Sugen-Kim line and 220kV Gensu Line, since for Islanding scheme to be successful it is

anticipated that the fault is in the Grid and the disturbance is spreading. If the 400 KV

lines remain connected till frequency falls to 48.0 Hz, the Power from Sugen will be

flowing towards the Faulty section of the Grid and Load-generation balance could never

be achieved as long as these 400 KV lines remain connected to Sugen 400 KV

Switchyard. Further, if Sugen-Kim lines and Gensu lines remain connected, it is possible

to form the Island with large portion of Gujarat and Sugen with Surat load initially and if

still the frequency is falls, Sugen can further be Islanded from GETCO system by

disconnecting the 220kV Sugen-Kim line and 220kV Gensu Line .

2) MS WRPC observed that as Surat load is only 630 MW and after forming Islanding,

Power Number of Surat will be reduced to 20 MW, which itself is very small number.

Therefore, Load-Generation balance should be done with very fine tuning of load which

can be achieved at lower voltage level i.e. 33/11 kV. It will be difficult to control the

variation of frequency in the Island without fine load control and the Island will not

sustain if such control is not there. Similarly, it is necessary to take prior permission from

PGCIL to trip the Sugen-Vapi line under emergency/Grid failure condition.

3) SLDC Gujarat/WRLDC emphasized opening of 220kV Sugen-Kim and Gensu feeders

ahead of opening 400kV lines. MS WRPC suggested that opening of 400kV lines before

220kV lines may cause severe disturbance and it would be difficult to prepare for the

Island with proper load generation balance. Therefore Sugen may remain connected with

the 400kV lines and the 400kV lines could be opened with the following changes in the

proposal at 10.2.

At 48.1 Hz OR (Freq<48.2 Hz .AND. time delay=0.15): 400kV Sugen-Unosugen and

400kV Sugen-Gandhar (Jhanor) lines will be tripped.

TPL/GETCO may update the progress.



ITEM NO. 11: FOLLOW UP ITEMS:

11.1: Status of Bus Coupler and Bus Bar protections at S/s.

Back Ground: In the 118th PCM, Chairman TCC stated that the Bus Bar protection schemes

should be implemented by the respective utility, without expecting the funding under R&U

from MoP, GoI.In 121st PCM,WRLDC informed that BB protection at 7 Nos of 220kV S/Ss

(Single Bus S/Ss) in GETCO system, 3 Nos of 220kV S/Ss in MSPGCL system, 7 Nos of

220kV S/Ss in MPPTCL system & 5 Nos of 220kV S/Ss in CSPTCL system was pending.

In 123rd PCM, GETCO representative intimated that out of 7 substations, BB

protection was commissioned at 5 substations. In the 127th PCM, GETCO representative stated

that the BB protection at 220 KV Limdi substation would be commissioned by September 2016.

The BB protection at, 220 KV Navsari substation would be commissioned by March 2017.

MPPTCL representative intimated that BB protection relays were procured and commissioning

is under progress.

The updated status given by constituents in the 127th PCM is as follows;

1) Non Availability of Bus Bar protection at 220/132 kV Bhatapara S/s:CSPTCL

intimated that busbar protection is under tendering stage.

2) Bus Bar protection at 400/220 kV Korba West S/s: Regarding LBB/Bus Bar protection at

400/220 kV Korba West, 200/132 kV Korba East and 220 kV Korba East Extension, CSPTCL

intimated that busbar protection has been installed at 400/220 kV Korba West S/s & it is

under testing. He also intimated that busbar protection relay procured for Korba east

extension.

Constituents may update the position.


ITEM NO. 12: Distance Protection Scheme settings at APL end on 400kVMundra- Sami

lines 1 & 2 :

In the 126th PCM, PGCIL representative stated that FSC is installed on 400kV Mundra-

Sami 1 & 2. However the DPS provided on the lines have not been set by factoring the FSC,

this may result in over reaching of the DPS schemes and therefore APL may factor in FSC, in

the settings of the distance protection schemes. APL representative stated that they are studying

the mutual coupling effect on zero sequence components during the faults and after detailed


study they would come up in the next PCM.

In the 126th PCM, the Committee suggested that the practice used by PGCIL, in setting the relay

of lines having FSC, be adopted by APL for time being and as & when the study by APL is

completed the same shall be shared by APL in the PCM for further discussions.

In the 127th PCM, APL representative stated that they still have observations on

adopting the settings as being adopted by PGCIL. He further requested that the matter be

discussed in a separate meeting. Committee suggested that a separate meeting be held in

Vadodara on the above issue.

The above meeting could not be held; therefore APL may give their observations

before the PCM.


ITEM NO. 13: ANY OTHER ITEM.

ITEM NO. 14: DATE AND VENUE OF THE NEXT MEETING

Committee may like to decide the date and venue for next PCM (129th PCM).

POWERGRID WRTS-I

SN NAME OF LINE/ICTTRIPPING

DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

1 400kV DHARIWAL TPP-PARLI II 2-Apr-16 17:29 3-Apr-16 11:44LINE TRIPPED DUE TO BROKEN OPGW & FALLING Y=PH CAUSING Y PH-EARTHFAULT AT 239KM FROMPARLI.

2 400kV KORBA-BHILAI I 3-Apr-16 13:28 3-Apr-16 14:50LINE A/R SUCCESSFUL AT BHILAI END ON Y PH TO E FAULT AT F. L. OF 71.99 KM FROM KORBA.F.C. -2.5 KA, LINE TRIPPED DUE M/s CSEB 11KV RAIL POLE, WHICH IS CREATING LOW CLEARANCEPROBLEM AT LOC.NO 277 (90KM FROM KORBA END).

3 400kV BHADRAVATI-PARLI I 5-Apr-16 18:18 5-Apr-16 18:18LINE A/R SUCCESSFUL AT BOTH END ON R-PH TO EARTH FAULT AT 51.78KM FROM BHADRAWATIHAVING FC OF 6.284KA AND 166.5KM FROM PARLI

4 400kV BHADRAVATI-PARLI I 5-Apr-16 19:23 5-Apr-16 19:23LINE A/R SUCCESSFUL AT BOTH END ON R-PH EARTH FAULT. F.C=6.2KA , F.L.=52KM FROM BVT END,378KM FROM PARLI END. F/C=1.17KA,

5 400kV KORBA-BHILAI I 5-Apr-16 18:40 5-Apr-16 20:36

LINE TRIPPED ON Y PH TO EARTH FAULT AT 91.73KM FROM BHILAI FC OF 3.674KA AND 93.19KMFROM KORBA. LINE TRIPPED DUE M/s CSEB 11KV RAIL POLE, WHICH IS CREATING LOW CLEARANCEPROBLEM AT LOC.NO 277 (90KM FROM KORBA END). THE POLE HAS BEEN REMOVED INCOORDINATION WITH CSEB.

6 400Kv PARLI-PUNE(GIS)_1 5-Apr-16 16:00 5-Apr-16 16:51LINE TRIPPED ON Y PH EARTHFAULT AT 174KM FROM PUNE GIS FAULT CURRENT 1.8KA AND 84.11KMFROM PARLI END.

7 400kV SATPURA-SEONI 6-Apr-16 21:00 6-Apr-16 21:42 LINE TRIPPED DUE TO RELAY MAL OPERATION AT SATPURA MPPTCL END.

8 400kV BHILAI-SEONI 9-Apr-16 16:39 9-Apr-16 17:24 LINE TRIPPED ON B PH TO E FAULT AT F.L. OF 13.7 KM FROM SEONI.

9 400kV KORBA-BHILAI II 9-Apr-16 9:59 9-Apr-16 12:59 LINE TRIPPED DUE TO HEAVY SPARKING IN MAIN BAY AT BHILAI CSPTCL END.

10 400kV SATPURA-SEONI 9-Apr-16 16:39 9-Apr-16 17:19 LINE TRIPPED ON B PH TO E FAULT AT F.L. OF 13.7 KM FROM SEONI.

11 400kV SATPURA-SEONI 10-Apr-16 12:56 10-Apr-16 16:36 LINE TRIPPED ON B PH TO E FAULT AT F.L. OF 14.5 KM FROM SEONI.

12 400kV BHILAI-SEONI 13-Apr-16 13:36 13-Apr-16 14:17LINE TRIPPED AT 13:36HRS ON Y PH-EARTH FAULT FL 40.3KM FC 7.32 KA FROM SEONI, & FL 497.8KMFC 1.692 KA FROM BHILLAI

13 400kV RAIGARH-STERLITE IV 13-Apr-16 13:55 13-Apr-16 14:44 LINE TRIPPED AT STARLITE END ONLY DUE TO TRIPPING OF TIE BAY CB DURING A/R OF STARLITE -ROURKELA END. AT STARLITE LINE IS ON BUS-1 THROUGH TIE BAY ONLY. SUSPECTED PROBLEM MAYBE RELAY SCHEME AT STARLITE END.INCLUDED. NO DT SIGNAL RECEIVED AT RAIGARH

14 400kV SATPURA-SEONI 16-Apr-16 4:01 16-Apr-16 4:27LINE TRIPPED ON B PHASE TO E/F LINE. A/R SUCCESSFULLY AT SEONI END WHILE LINE TRIPPED FROMSATPURA END. A/R UNSUCESSFUL AT SATPURA MPPTCL END. LINE BELONGS TO M/S MPPTCL.

15 400kV KSK-RKKML III 17-Apr-16 21:13 17-Apr-16 22:24LINE TRIPPED AT RKMPPL END ONLY. A/R SUCCESSFUL AT KSK END DUE TO B PH EARTHFAULT AT3.58KM FROM KSK AND FC- 985A. A/R WAS DISABLED AT RKMPPL END.


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

16 765KV DURG PS - D'JAIGARH 17-Apr-16 21:20 17-Apr-16 22:48LINE TRIPPED DUE TO Y PH EARTH FAULT AT 132KM FROM D'GARH. FC - 10.9KA AT D'GARH END AND7.2KA AT DURG END.

17 400kV RAIGARH-IBEUL I 22-Apr-16 15:30 22-Apr-16 17:47LINE TRIPPED DUE TO R PH EARTHFAULT AT 93.1KM FROM RAIGARH END F/C OF 2.69KA & 10.52 KMFROM IND BARATH. FAULT LOCATION IS IN THE LILO PORTION OF IND BARATH.

18 400kV RAIGARH-IBEUL I 23-Apr-16 13:57 23-Apr-16 14:12 LINE TRIPPED DUE TO R PH EARTHFAULT AT 94.2KM FROM RAIGARH END F/C OF 3.06KA.

19 400kV RAIPUR-KWPCL II 25-Apr-16 16:41 25-Apr-16 17:57LINE TRIPPED ON LINE REACTOR BUCKHOLZ PROTECTION OPERATED DUE TO DC EARTH FAULT ATRAIPUR END

20 400kV RKKML-RAIGARH III 26-Apr-16 20:26 26-Apr-16 20:41 LINE TRIPPED ON YPH-EARTH FAULT. F/L=1.3KM & F/C=12.8KA FROM RKKML

21 400kV BHADRAVATI-PARLI I 27-Apr-16 21:14 27-Apr-16 21:14LINE A/R SUCESSFULLY FROM BOTH END ON R-PH AT A DISTANCE OF 308KM (M1) & 316KM(M2)FROM PARLI END.

22 400Kv PARLI-PUNE(GIS)_2 27-Apr-16 19:44 27-Apr-16 20:00LINE TRIPPED ON R PH EARTH FAULT AT F/L=269KM & F/C= 1.2KA FROM PUNE GIS AND F/L=7.7 KM& F/C= 13.5KA FROM PARLI.

23 400kV RKKML-RAIGARH III 27-Apr-16 20:50 27-Apr-16 21:05LINE TRIPPED ON Y PH EARTHFAULT AT 1.72KM FROM RKM AND 21.8KM FROM RAIGARH HAVING FCOF 13.1KA.

24 400kV VINDHYACHAL-KORBA II 27-Apr-16 13:30 27-Apr-16 19:40LINE TRIPPED DUE TO HEAVY RAIN & THUNDER NEAR TO V'CHAL AREA ON M1- R PH E FAULT & M2 -Y PH E FAULT AT 287.7KM FROM KORBA AND Y PH E FAULT AT 14.36KM FROM V'ÇHAL HAVING FC OF17.44KA.

25 765kV SEONI-WARDHA I 29-Apr-16 1:25 29-Apr-16 1:58LINE TRIPPED ON BPH-E FAULT AT 141.6KM FC-4.48 FROM WARDHA AND 98KM FROM SEONI END FCOF 5.49KA.

26 400kV RAIPUR-BHADRAVATI II 4-May-16 19:08 4-May-16 19:22LINE AUTO RECLOSED AT BHADRAWATI END DUE TO TRIPPING ON B PHASE FAULT. MAIN-1 (REL670)RELAY OPERATED ON ZONE-2 WITH CARRIAR RECEIVE FROM RAIPUR END WITH FAULT CURRENT 1.8KA

27 400kV RKKML-RAIGARH III 4-May-16 20:03 4-May-16 20:13LINE AUTO RE CLOSED SUCCESSFUL FROM BOTH END, BUT FAULT PERSISTED AND TRIPPED DUE TO RPH TO EARTH FAULT. FC-18.6 KA, FD-8.4 KMS FROM RAIGARH END.. LINE TRIPPED DUE TO LESSCLEARANCE BETWEEN OPGW PILOT WIRE & Y-PHASE

28 400kV BHADRAVATI-CHANDRAPUR IV 5-May-16 19:53 5-May-16 21:23LINE AUTO RECLOSED ON B PHASE TO EARTH FAULT BUT TRIPPED ON FAULT AGAIN IN RECLAIMETIME. DURING TRIIPING HEAVY LIGHTNING AND RAINS IN BHADRAWATI AREA. MAIN-1= FL=7.28KMIB=13.83KA,

29 400kV BHADRAVATI-PARLI I 5-May-16 18:04 5-May-16 18:04LINE A/R SUCESSFULLY ON B-PH TO EARTH FAULT AT BOTH ENDS FAULT DISTANCE 187.8KM FROMPARLI.

30 400kV BHADRAVATI-PARLI I 5-May-16 18:10 5-May-16 19:10LINE TRIPPED ON Y-PH TO EARTH FAULT AT DISTANCE OF 207KM FROM PARLI & FROM BHADRAWATIEND MAIN-1= FL=137KM IY=2.8KA,

31 400kV BHADRAVATI-PARLI I 5-May-16 19:43 6-May-16 11:45LINE TRIPPED DUE TO LINE ISOLATOR R PH JUMPER DAMAGED AT BHADRAWATI END . RELAYINDICATION AT BHADRAWATI : MAIN-1= FL=-1.1KM IR=30.27KA,


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

32 400kV DHARIWAL TPP-PARLI II 5-May-16 18:10 6-May-16 16:09LINE TRIPPED ON BPH E FAULT DUE TO OPGW PILOT ROPE BROKEN . F.L 206KM FROM PARLI END. &TRIPPED ON R-Y PHASE FAUL FROM PARLI END.

33 400KV VANDANA-BIRSINGHPUR 5-May-16 18:09 5-May-16 19:13 LINE TRIPPED ON B PH E FAULT . F.L - 145KM FROM BIRSINGPUR . F.C -2.18KA .

34 400KV VANDANA-BIRSINGHPUR 5-May-16 20:23 5-May-16 20:43LINE TRIPPED ON B PH E FAULT F.C -2KA FROM BIRSINGPUR . FAULT OCCURRED DUE TO ONE OPENYPH- SUBCONDUCTOR JUMPER AT LOC. 06 IN M/S VANDANA LILO PORTION INFORMED BY M/SVANDANA ON 13.05.16.

35 400kV WARDHA-MAUDA I 5-May-16 19:00 5-May-16 19:26LINE COULD NOT A/R ON RPH TO EARTH FAULT AS AUTO RECLOSED KEPT IN OFF POSITION FORCARRYING OUT ONLINE OPEGW WORK. RELAY INDICATION AT WARDHA S/S. MAIN-1:- ZONE-1 , RPH-GRN, 18.15KM , 16KA. MAIN-2 :- Z-1 OPTD., RPH-GRND, 18.15 KM , 16KA

36 400kV WARDHA-MAUDA II 5-May-16 18:53 5-May-16 19:49LINE AUTORECLOSED SUCESSFULLY FROM BOTH ENDS BUT TRIPPED FROM BOTH ENDS DUE TOFAULT IN RECLAIM TIME. RELAY INDICATION AT WARDHA S/S. MAIN-1:- ZONE-1 OPTD, BPH-GRND, 19KA, 11.5 KM.

37 765kV WARDHA - AURANGABAD(PG) I 6-May-16 18:01 7-May-16 10:38LINE TRIPPED DUE TO Y-B PH FAULT AT 23.7KM FROM WARDHA F/C= 22.2KA DUE TO FALLING OFSNAPPED EARTH WIRE ON PHASE CONDUCTORS AT LOC. NO. 70-71.

38 765kV WARDHA - AURANGABAD(PG) II 6-May-16 18:14 6-May-16 18:14LINE A/R SUCESSFULLY FROM BOTH ENDS ON BPH EARTH FAULT AT 22.2KM FROM WARDHA HAVINGFC OF 12.6KA.

39 765kV WARDHA - AURANGABAD(PG) II 6-May-16 18:15 6-May-16 18:15LINE A/R SUCESSFULLY FROM BOTH ENDS ON BPH EARTH FAULT AT 22.2KM FROM WARDHA HAVINGFC OF 12.6KA.

40 765kV WARDHA - AURANGABAD(PG) II 6-May-16 18:18 7-May-16 16:34LINE TRIPPED AFTER SUCESSFULLY A/R ON PERSISTANT BPH EARTH FAULT AT 22.2KM FROMWARDHA F/C= 12.6KA DUE TO FALLING OF SNAPPED EARTH WIRE AT LOC. 70-71 AND 296.3KM FROMA'BAD HAVING FC OF 1.9KA .

41 765kV WARDHA - AURANGABAD(PG) IV 6-May-16 18:32 6-May-16 18:37LINE TRIPPED AT WARDHA END DUE TO RELAY MAL-OPERATION DURING CHARGING OF 765KVWARDHA - AURANGABAD(PG) II LINE.

42 400Kv PARLI-PUNE(GIS)_1 11-May-16 18:51 11-May-16 23:15 LINE TRIPPED ON BUS BAR PROTECTION OPERATION

43 400Kv PARLI-PUNE(GIS)_2 11-May-16 18:51 11-May-16 21:16LINE TRIPPED ON BUS BAR PROTECTION OPERATION DURING HEAVY WIND , THUNDER & LIGHTINGAT PUNE(GIS).

44 400Kv PUNE(GIS)-PUNE(TALEGOAN)_1 11-May-16 18:45 11-May-16 18:45LINE A/R SUCCESSFUL AT PUNE END DUE TO Y PH EARTH FAULT AT 66.8KM FROM PUNE HAVING F/COF 2.85KA.

45 400Kv PUNE(GIS)-PUNE(TALEGOAN)_1 11-May-16 18:51 11-May-16 21:08 LINE TRIPPED ON BUS BAR PROTECTION OPERATION

46 400Kv PUNE(GIS)-PUNE(TALEGOAN)_2 11-May-16 18:42 12-May-16 9:47LINE TRIPPED ON Y PH- EARTH FAULT AT 36.9KM FROM PUNE F/C= 8.46KA. F/C - 7.9KA AT PUNE GIS.LINE TRIPPED DUE TO OPGW PILOT ROPE TOUCHING TO PHASE WIRE NEAR LOC. NO. 721 .


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

47 400KV VANDANA-BIRSINGHPUR 11-May-16 15:42 11-May-16 17:24LINE TRIPPED BY DISTANCE PROTECTION Z 1, FC - ZERO & FL - 0.8 KM FROM VANDANA AND 144KMFROM BIRSINGHPUR. FAULT OCCURRED DUE TO ONE OPEN YPH- SUBCONDUCTOR JUMPER AT LOC.06 IN M/S VANDANA LILO PORTION.

48 400kV KOLHAPUR (MSETCL)- KOLHAPUR (GIS) II 13-May-16 15:59 13-May-16 16:14LINE TRIPPED DUE TO FAILURE OF B PHASE LINE CT AND OPERATION OF BUSBAR PROTECTION ATKOLHAPUR MSETCL END

49 400Kv PARLI-PUNE(GIS)_2 13-May-16 13:25 13-May-16 14:16LINE TRIPPED AT PUNE GIS ON R PH REACTOR DIFFERENTIAL PROTECTION OPERATION DURINGTIGHITNG OF LOOSE CT CONNECTION TERMINAL.

50 400kV RAIGARH-IBEUL I 13-May-16 1:08 13-May-16 2:37LINE TRIPPED FROM RAIGARH END ONLY ON BPH- EARTH FAULT UNDER ZONE-2 F/L= 86KM FROMRAIGARH.

51 400kV RAIPUR-KSK III 13-May-16 17:41 13-May-16 17:41LINE A/R SUCESSFULLY FROM BOTH ENDS ON BPH TO EARTH FAULT. F/L= 20KM FROM KSK & 152KMFROM RAIPUR. F/C=3.51KA.

52 400KV VANDANA-BIRSINGHPUR 13-May-16 15:48 13-May-16 17:54LINE TRIPPED ON B-PHASE TO E FAULT FD-0.8 KMS FROM VANDANA FC-2.1 KA .FAULT OCCURREDDUE TO ONE OPEN YPH- SUBCONDUCTOR JUMPER AT LOC. 06

53 765kV CHAMPA- KOTRA PS 13-May-16 19:19 13-May-16 20:17LINE TRIPPED DUE TO R PHASE TO Y PHASE FAULT. FC R PH=8.87KA, FC Y PH=8.87KA, FD=65KM FROMKOTRA END. FD=31.5KM FROM CHAMPA END.

54 400kV BHADRAVATI-CHANDRAPUR I 14-May-16 11:25 14-May-16 15:15LINE TRIPPED ON BPH TO EARTH FAULT F/L=8.74KM FROM BHADRAWATI DUE TO FIRE CAUSED BYBURNING OF GRASS BY VILLAGER/ FARMERS IN UNDERNEATH OF LINE AT LOC. NO. 885.

55 400kV RAIGARH-ROURKELA II 16-May-16 22:44 16-May-16 22:44LINE AUTO RE-CLOSD SUCCESSFULLY FROM BOTH END ON R=PH TO E FAULT F/C-1.9 KA,& F/L= 201.2KM FROM RAIGARH.

56 400kV KORBA-BALCO 17-May-16 17:39 17-May-16 18:35LINE TRIPPED ON B-PH EARTH FAULT AT BALCO F/C =5KA. F/L= 7.8KM FROM KORBA . FAULT IS INLILO PORTION OF M//S BALCO.

57 400kV KORBA-BHILAI I 17-May-16 17:23 17-May-16 18:28 LINE TRIPPED ON Y PH EARTH FAULT AT Z2 & 200KM FROM BHILAI F/C = 1.951KA

58 400kV KORBA-KORBA(WEST) 17-May-16 17:46 17-May-16 18:12 LINE TRIPPED ONLY AT KORBA CSEB END & HANGING FROM KORBA NTPC END.

59 400kV KORBA-RAIPUR IV 17-May-16 17:24 17-May-16 18:03 LINE TRIPPED ON B PH EARTH FAULT AT 215KM FROM RAIPUR F/C = 1.99KA. FL - 13KM

60 400kV KORBA-SIPAT 17-May-16 17:41 17-May-16 18:11LINE TRIPPED ONLY AT KORBA NTPC END & HANGING FROM SIPAT NTPC END.. FAULT OCCURREDDUE TO HEAVY WIND, THUNDERSTORM AND RAIN.

61 400kV RAIGARH-IBEUL I 17-May-16 1:05 17-May-16 1:41LINE TRIPPED ON B-E FAULT. F/C=6.2KA, F/L=56.7KM. LINE A/R SUCESSFULLY FROM BOTH ENDS BUTAFTER 1 SEC DT RECEIVED FROM REMOTE END AND TRIPPED DUE TO PROBLEM IN RELAY SCHEME ATIBEUL END.

62 765kV CHAMPA- KOTRA PS 17-May-16 18:44 17-May-16 22:07LINE TRIPPED ON TO Y PH - B PH FAULT AT 60.98KM FROM KOTRA PS F/C 8.7KA & 8.3KARESPECTIVELY. F/L =36.4KM FROM CHAMPA PS.

63 765kV D'JAIGARH-RANCHI II 17-May-16 18:10 17-May-16 19:16 LINE TRIPPED ON R-PH EARTH FAULT AT Z1 & 4KM FROM D'GARH F/C=14.6KA


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

64 400kV DHARIWAL TPP-PARLI II 19-May-16 15:47 19-May-16 16:49 LINE TRIPPED ON Y-E, 83.8KM FROM PARLI F/C= 3.5KA.

65 765kV DURG PS -WARDHA_2 20-May-16 17:14 20-May-16 18:41LINE TRIPPED ON B PHASE TO E FAULT AFTER SUCESSFUL A/R, ,FC-11.7KA,FL-16 KM FROM DURG ANDFC-2.8KA,FL-370 KM FROM WARDHA END

66 400kV KORBA-BHILAI I 21-May-16 16:05 21-May-16 17:14 LINE TRIPPED ON R PHASE TO E FAULT FD-53.22 KMS FROM D'-JAYGARH END FC-5.607 KA

67 400kV RAIGARH-IBEUL I 21-May-16 18:02 21-May-16 20:15 LINE TRIPPED DUE TO BUS BAR PROTECTION OPERATED AT IBEUL END

68 400kV RAIPUR-DURG I 21-May-16 16:32 21-May-16 18:01 LINE TRIPPED ON Y PHASE TO B PHASE FAULT FD-22.5 KMS FROM DURG END FC-7.0KA

69 400kV RAIPUR-DURG II 21-May-16 16:41 22-May-16 10:39LINE TRIPPED DUE TO HEAVY WIND AND THUNDER STORM ON Y PHASE TO B PHASE FAULT FC-2.0KA , FD-1.0 FROM DURG END

70 400KV RAIPUR-WARDHA I 21-May-16 15:48 21-May-16 16:35 LINE TRIPPED ON B PHASE TO E FAULT FD-160 KMS FROM RAIPUR END FC-2.8 KA

71 400kV RKKML-RAIGARH III 21-May-16 16:58 21-May-16 18:44 LINE TRIPPEDON RPH-E FAULT . F.L -17KM FROM RKM END . F.C-2.4 KA.

72 765kV D'JAIGARH-RANCHI I 21-May-16 16:14 21-May-16 18:03 LINE TRIPPED ON R PHASE TO E FAULT FD-83.1 KMS FROM D'-JAYGARH END FC-3.0 KA

73 765kV D'JAIGARH-RANCHI II 21-May-16 16:04 21-May-16 23:08 LINE TRIPPED ON Y PHASE TO E FAULT FD-344 KMS FROM D'-JAYGARH END FC-2.2 KA

74 765KV DURG PS - D'JAIGARH 21-May-16 16:13 21-May-16 17:15 LINE TRIPPED ON B PHASE TO E FAULT FD-205 KMS FROM D'-JAYGARH END FC-3.4 KA

75 400kV DHARIWAL TPP-PARLI II 23-May-16 22:37 23-May-16 23:37LINE TRIPPED ON PERSISTANT FAULT AFTER SUCESSFUL A/R, DUE TO HEAVY WIND, THUNDERSTROM, LIGHTNING ON Y PH EARTH FAULT AT 86.8 KM FROM PARLI F/C= 3.7 KA..

76 400kV KORBA-BALCO 23-May-16 13:59 23-May-16 15:08 LINE TRIPPED DUE TO Y PH EARTH FAULT AT 12.2KM FROM BALCO F/C =5.35KA. JUMPER OPEN

77 400kV KORBA-VANDANA 23-May-16 13:59 23-May-16 15:17 LINE TRIPPED DUE TO Y PH EARTH FAULT AT 11.8KM FROM VANDANA F/C= 1.649KA.

78 765kV D'JAIGARH-RANCHI II 23-May-16 14:55 23-May-16 16:18LINE TRIPPED DUE TO B PH EARTH FAULT AT F/L=260KM FROM D'GARH F/C=2.4KA AND 133KM FROMRANCHI HAVING FC OF 2.6KA.

79 765kV PUNE(GIS)-SOLAPUR 24-May-16 18:25 24-May-16 19:00LINE A/R FROM BOTH ENDS BUT TRIPPED ON PERSISTANT FAULT DUE TO ON Y PH - E FAULT.FD=98.6KM, FC= 6.57KA AT SOLAPUR END AND FD=145 KM, FC= 2.43KA AT PUNE GIS END.

80 400kV RAIPUR-DURG I 25-May-16 14:23 25-May-16 14:23 A/R SUCCESSFULLY OPERATED AT BOTH ENDS ON B PH - E FAULT. FD=12KM FROM RAIPUR END

81 400kV VINDHYACHAL-KORBA II 27-May-16 11:50 27-May-16 13:25 LINE TRIPPED ONLY AT VINDHYACHAL END DUE TO BUS FAULT AT VINDHYACHAL..

82 400KV RAIPUR-KSK IV 28-May-16 12:26 28-May-16 13:39 LINE TRIPPED AT KSK END ONLY. DT RECEIVED AT RAIPUR.

83 765kV KOTRA PS-DURG PS I 28-May-16 19:23 29-May-16 20:37LINE TRIPPED DUE TO HEAVY WIND, THUNDERSTROM & LIGHTNING NEAR KOTRA PS CAUSING R-PHASE CVT JUMPER STUD OPENED LATER COLLIDED WITH TOP STACK DUE TO WHICH TOP STACK OFCVT GOT DAMAGED AND OIL SPLASHED ALL-AROUND AT KOTRA END


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

84 400kV BHADRAVATI-CHANDRAPUR III 3-Jun-16 15:13 3-Jun-16 17:50 LINE TRIPPED ON BPH-EARTH FAULT, 2.7 KM FROM BHADRAWATI END, FC 22 KA

85 400kV BHADRAVATI-CHANDRAPUR IV 3-Jun-16 15:13 3-Jun-16 18:16 LINE TRIPPED ON B-E, 5.4 KM FROM BHADRAWATI END

86 400kV RAIGARH-ROURKELA II 3-Jun-16 16:45 4-Jun-16 11:15LINE TRIPPED OPGW WIRE FALL ON Y PHASE (TOP ) AT DISTANCE OF 10 KM (APPRX) FROMRAIGARH & F/C 19.76KA.

87 765kV AURANGABAD(PG)-SOLAPUR I 3-Jun-16 17:20 3-Jun-16 17:20A/R SUCCESSFULLY FROM BOTH ENDS ON R-PH TO EARTH FAULT, F/L=116KM F/C=4.3KA FROMSOLAPUR.

88 400kV DHARIWAL TPP-PARLI II 4-Jun-16 20:31 4-Jun-16 21:31 LINE TRIPPED ON Y-PH TO E FAULT. F/L -86KM & F/C-3.79KA FROM PARLI END .

89 400Kv AURANGABAD(MSETCL)-PUNE(GIS) II 5-Jun-16 18:51 5-Jun-16 18:51 A/R SUCESSFULLY ON YPH-E FAULT F.L-49.9KM FROM PUNE GIS. F.C-5.6KA.

90 400kV BHILAI-SEONI 5-Jun-16 18:05 5-Jun-16 18:05 A/R SUCESSFULLY ON RPH-E FAULT F.C-3.03KA. F.L-158.5KM FROM SEONI.

91 765kV SEONI-WARDHA I 5-Jun-16 07:27 5-Jun-16 11:30 LINE TRIPPED DUE TO L/R B PH BUCHHOLZ RELAY OPERATED AT WARDHA S/S.

92 400kV AURANGABAD (PG) -AKOLA I 6-Jun-16 05:47 6-Jun-16 6:28LINE A/R SUCCESSFUL AT AURANGABAD END,BUT TRIPPED AT MSETCL AKOLA END ON B PHASE TO EFAULT,FC-31.07KA,FL-8.8 KM FROM AKOLA END. PROBLEM IS SUSPECTED IN A/RCONFIGURATION OF TIE BCU AT AKOLA MSETCL.

93 400kV KORBA-MAHAN 6-Jun-16 19:33 6-Jun-16 20:20LINE TRIPPED ON Y PHASE TO E FAULTFC-1.9KA,FL-28 KM FROM MAHAN AND FL-208KM FROMKORBA END.

94 400kV LARA(NTPC)-KOTRA PS I 6-Jun-16 15:57 6-Jun-16 16:50 LINE TRIPPED ONLY AT KOTRA END DUE TO DT RECEIVED FROM LARA END.

95 765kV SEONI-WARDHA I 6-Jun-16 15:30 6-Jun-16 15:30LINE A/R SUCCESSFUL FROM BOTH ENDS ON B-PH TO EARTH FAULT. F/L=140.73KM AND FAULTCUREENT:4.6KA FROM WARDHA END. & F/L=M1:100.5 KM AND F/C=:4.9KA FROM SEONI.

96 765kV SEONI-WARDHA I 6-Jun-16 15:30 6-Jun-16 15:58LINE A/R SUCCESSFUL & THEN TRIPPED DUE TO HEAVY WIND, THUNDERSTROM & LIGHTNING ON BPHASE TO E FAULT,FC-4.6KA,FL-140.7 KM FROM WARDHA AND FC-4.9KA,FL-100.5 KM FROM SEONIEND .

97 400kV BHADRAVATI-PARLI I 7-Jun-16 12:53 7-Jun-16 20:17LINE TRIPPED ON R PH EARTH FAULT AFTER SUCCESSFUL A/R AT BOTH END. FD - 8.6KM FROM BVTAND 254.7KM FROM PARLI. FC - 20KA AT BVT. LINE TRIPPED DUE TO HANGING OF OPGW PILOTROPE.

98 765kV TAMNAR PS-KOTRA PS I 7-Jun-16 18:10 7-Jun-16 18:10LINE SUCCESSFUL AUTO RECLOSE FROM BOTH ENDS ON R-E PH FAULT . FAULT DISTANCE =27.4 KM& F/C=5.05KA FROM TAMNAR .

99 400kV DHARIWAL TPP-PARLI II 8-Jun-16 05:11 8-Jun-16 7:29LINE A/R SUCCESSFUL AND THEN TRIPPED DUE TO HEAVY WIND, THUNDERSTROM & LIGHTNING ONB-E, FC-1.8KA,FL-194.9KM FORM PARLI & FC-2.58KA,FL-149 KM FROM DHARIWAL END.

100 400kV RAIPUR-WARDHA I 9-Jun-16 3:04 9-Jun-16 3:04LINE A/R SUCCESSFULLY ON Y PH TO FAULT,FD-265 KM FROM WARDHA AND 127 KM FROM RAIPUREND,

101 400kV DHARIWAL TPP-PARLI II 11-Jun-16 17:21 11-Jun-16 17:40LINE TRIPPED ON R PH - B PH FAULT, FL-216.39 KM FROM PARLI END, FC R PH 2.83 KA, Y PH 2.48KA.LINE CHARGING


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

102 400kV DHARIWAL TPP-PARLI II 12-Jun-16 13:37 13-Jun-16 0:43 LINE TRIPPED ON R PH - B PH FAULT, FL-216.39 KM FROM PARLI END, FC R PH 2.83 KA, Y PH 2.48KA.

103 400kV RAIGARH-ROURKELA II 16-Jun-16 13:09 16-Jun-16 13:51LINE TRIPPED BY R-Y PH TO PH FAULT AT 70KM FROM RAIGARH F/C =3.8KA AND 127KM FROMROURKELA. 02 NOS TOWER COLLAPSE WAS FOUND IN THE STERLITE LILO PORTION (LINE OWNED BYSTERLITE).

104 400kV WARDHA-MAUDA I 17-Jun-16 15:22 17-Jun-16 16:45LINE TRIPPED ON Y PH-E FAULT DUE TO HANGING OF OPGW PILOT ROPE, FL- 64.2 KM FROMWARDHA END. F.C=6.6 KA. A/R WAS IN NON-AUTO MODE FOR OPGW WORKS.

105 400Kv PUNE(GIS)-PUNE(TALEGOAN)_4 20-Jun-16 1:38 20-Jun-16 2:35LINE TRIPPED DUE TO HEAVY WIND, THUNDERSTROM & LIGHTNING ON Y PH-E FAULT,FC-6.9KA AT TALEGAON, F/L=40KM FROM PUNE TALEGOAN

106 400kV DHARIWAL TPP-PARLI II 21-Jun-16 17:42 21-Jun-16 18:48 LINE TRIPPED ON Y PHASE TO E FAULT,FC-3.9KA,FL-82.8KM FROM PARLI END.

107 765kV BILASPUR-SIPAT II 21-Jun-16 16:57 21-Jun-16 18:53 LINE TRIPPED FROM SIPAT NTPC END. DT RECEIVED AT BILASPUR END.

108 400kV KORBA-RAIPUR III 22-Jun-16 19:05 22-Jun-16 21:09LINE TRIPPED AT KORBA END ONLY DUE TO RELAY MAL-OPERATION AT KORBA END.LINE WAS INCHARGED CONDITION FROM RAIPUR END.

109 400kV LARA(NTPC)-KOTRA PS II 23-Jun-16 19:57 23-Jun-16 20:15 LINE TRIPPED DUE TO B PH EARTHFAULT AT 19.8KM FROM KOTRA PS HAVING FC OF 16.1KA.

110 400kV RAIGARH-KOTRA PS II 23-Jun-16 20:30 23-Jun-16 21:18 LINE TRIPPED AT RAIGARH END ONLY DUE TO B PH EARTHFAULT HAVING FC OF 9.6KA.

111 765kV TAMNAR PS-KOTRA PS II 23-Jun-16 19:57 23-Jun-16 20:13 LINE TRIPPED AT KOTRA PS END ONLY .A/R SUCCESSFULLY OPTD. AT TAMNAR

112 400kV KORADI-SATPURA 25-Jun-16 14:58 25-Jun-16 21:42LINE TRIPPED DUE TO HANGING OF OPGW PILOT ROPE AT LOC NO 710 ON R PHASE TO E FAULT, F.D185.7 MTR, F.C 22.5 KA AT KORADI END.

113 400kV BHILAI-BHATAPARA 26-Jun-16 18:44 26-Jun-16 19:36 LINE TRIPPED ON Y PHASE TO E FAULT F.D 11.8KM FROM BHATAPARA END, F.C 5KA AT BHILAI END

114 400kV RAIPUR-WARDHA II 26-Jun-16 17:28 26-Jun-16 17:28A/R SUCCESSFULLY OPERATED AT BOTH ENDS ON B PHASE TO E FAULT. F.C 5.5KA, F.D 88.5 KM FROMWARDHA END

115 765kV DURG PS- CHAMPA_1 1-Jul-16 19:44 1-Jul-16 23:40LINE TRIPPED ON Y-B PH FAULT AT ZONE -2 FROM DURG PS HAVING FC OF Y PH 6.196KA & B PH6.184KA AT RAIPUR(DURG).

116 400kV RAIPUR-RAIGARH II 6-Jul-16 7:48 6-Jul-16 11:14 LINE TRIPPED ON RPH-E FAULT DUE TO TCSC VALVE SYSTEM FAILURE / FIRE CAUGHT AT RAIPUR END

117 765kV DURG PS- CHAMPA_1 9-Jul-16 12:33 9-Jul-16 12:33 LINE A/R SUCESSFULLY F/L=117KM FROM DURG PS.

118 400kV AURANGABAD (PG) -AKOLA II 12-Jul-16 13:03 12-Jul-16 21:14LINE TRIPPED DUE DC SUPPLY EXTENDING TO RELAY WHILE RECTIFICATION OF CONTROL CABLES ATAURANGABAD END

119 765kV WARDHA - AURANGABAD(PG) I 13-Jul-16 17:13 13-Jul-16 17:36LINE TRIPPED ONLY AT WARDHA END DUE TO DT SENT FROM AURANGABAD. DT SEND CONTACT INAUXILARY SWITCH OF TIE BREAKER (SIEMENS MAKE) GOT FAULTY DUE TO THE CORROSION PROBLEMAT A'BAD.


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

120 765kV WARDHA - AURANGABAD(PG) II 15-Jul-16 13:58 15-Jul-16 14:48LINE TRIPPED ON REF PROTECTION DUE TO DC EARTH LEAKAGE DURING RECTIFICATION OF CABLEWORKS AT AURANGABAD END.

121 400kV RAIPUR-RAIGARH II 21-Jul-16 23:33 21-Jul-16 23:33LINE AUTO RECLOSED SUCCESSFULLY ON BPH- EARTH FAULT, 2.9 KA, 129.3 KM FROM RAIGARH END.REMOTE END: MAIN-1 --B- PHASE, 80.5 KM, 04.31 KA. MAIN-2 – 78.82 KM. END

122 400kV KORBA-KORBA(WEST) 22-Jul-16 1:14 22-Jul-16 3:24 LINE TRIPPED AT KORBA NTPC END ONLY.

123 400kV WARDHA-PARLI II 23-Jul-16 17:32 23-Jul-16 17:32 LINE AUTO-RECLOSURE SUCCESSFUL ON R-E FAULT AT F/L24.66KM, F/C=12.4KA.

124 400kV WARDHA-PARLI I 30-Jul-16 22:09 30-Jul-16 22:51LINE TRIPPED ON . Y-E FAULT , 141KM FROM WARDHA, 3.6KA. A/R SUCESSFUL AT PARLI END BUTUNSUCESSFUL AT WARDHA END,

125 765kV D'JAIGARH-BILASPUR 30-Jul-16 12:32 30-Jul-16 13:29LINE TRIPPED AT BILASPUR END ONLY . DT RECEIVED AT BILASPUR. MAIN BAY SHUTDOWN WASAVAILED AT DHARAMJAYGARH.

126 400kV BHADRAVATI-PARLI I 31-Jul-16 15:49 31-Jul-16 23:52LINE TRIPPED DUE TO FALLING OPGW WIRE ON CONDUCTOR , FD -4.27 KMS,(FROM BVT END) FC-24.8 KA , Y PHASE TO E/F, PARLI END DETAILS:- FD- 378.2 KMS, FC-1.0 KA ,Y PH TO E/F.

127 400kV RAIGARH-STERLITE IV 2-Aug-16 4:30 2-Aug-16 4:30 LINE A/R SUCESSFULLY FROM BOTH ENDS ON -R- PHASE, 3.74 KA, 104.5 KM FROM RAIGARH END.

128 765kV D'JAIGARH-BILASPUR 3-Aug-16 12:54 3-Aug-16 13:22 LINE TRIPPED AT BILASPUR END ONLY BY DT RECEIVED FROM D'GARH DUE TO PLCC MAL OPERATION

129 400kV AURANGABAD (PG) -AKOLA II 5-Aug-16 18:33 5-Aug-16 20:20 LINE TRIPPED DUE TO MALOPERATION OF BPL MAKE PLCC CHANNEL-1 AT AURANGABAD END.

130 400kV KOLHAPUR (MSETCL)- KOLHAPUR (GIS) I 9-Aug-16 11:45 9-Aug-16 12:53 LINE TRIPPED AT KOLHAPUR MSETCL END ONLY DUE TO PLCC PANEL MALOPERATION.

131 400kV RAIGARH-JHARSUGUDA III 10-Aug-16 5:22 10-Aug-16 15:37 LINE TRIPPED ON . R-Y , R -8.9 KA, Y - 12.43 KA, 31.5 KM FROM RAIGARH END

132 400kV RAIGARH-STERLITE IV 10-Aug-16 5:22 10-Aug-16 5:22LINE A/R SUCESSFULLY FROM BOTH ENDS ON -R- PHASE, R- PHASE, 7.3 KA, 25.11 KM FROM RAIGARHEND.

133 765kV TAMNAR PS-KOTRA PS II 15-Aug-16 15:25 15-Aug-16 15:25LINE A/R SUCESSFULLY FROM BOTH ENDS ON B PH. F/C=5.56 KA AND FAULT DISTANCE IS 15.29 KMFROM TAMNAR PS.

134 400kV KORBA-BIRSINGHPUR 16-Aug-16 23:12 16-Aug-16 23:30 LINE TRIPPED AT ONLY BIRSINGPUR END, DUE TO CB PROBLEM AT BIRSINGPUR MPPTCL END.

135 765kV CHAMPA- KOTRA PS 17-Aug-16 10:48 17-Aug-16 10:48

LINE A/R SUCESSFULLY FROM BOTH ENDS ON Y PH - B PH, FAULT CURRENT = 8.8 KA & FAULTLOCATION = 60.98 KM FROM KOTRA PS END.

136 400kV BHATAPARA-KORBA 22-Aug-16 6:44 22-Aug-16 8:06LINE SUCESSFULLY A/R FROM BHATAPARA END BUT A/R RELAY FAILED TO OPERATE AT KORBA NTPCEND, HENECE LINE TRIPPED ON TRANSIENT B PHASE TO E FAULT ONLY AT KORBA END. F/C=2.4KA &F/D=96KM FROM BHATAPARA END.


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

137 400kV AURANGABAD (PG) -AKOLA I 25-Aug-16 18:42 25-Aug-16 19:20LINE CBS OPEND AT AKOLA END ONLY ON RECEIPT OF DT, LINE IS IN CHARGED CONDITION FROMAURANGABAD END.

138 400kV RAIGARH-IBEUL I 25-Aug-16 18:53 25-Aug-16 18:53LINE A/R SUCESSFULLY FROM BOTH ENDS ON YPH-EARTH FAULT AT F/L=30.9 KM & 9.5KA FROMRAIGARH END.

139 400kV RAIGARH-KOTRA PS II 25-Aug-16 8:55 25-Aug-16 8:55LINE A/R SUCESSFULLY FROM BOTH ENDS ON YPH-EARTH FAULT AT F/L=2 KM & 19.2KA FROMRAIGARH END.

140 400kV RAIPUR-RAIGARH I 25-Aug-16 14:53 25-Aug-16 14:53LINE A/R SUCESSFULLY FROM BOTH ENDS ON RPH-EARTH FAULT AT F/L=185 KM & 2.1KA FROMRAIGARH END.

141 400kV RAIPUR-RAIGARH II 25-Aug-16 9:26 25-Aug-16 9:26LINE A/R SUCESSFULLY FROM BOTH ENDS ON YPH-EARTH FAULT AT F/L=5.4 KM & 22.9KA FROMRAIGARH END.

142 400kV RAIPUR-SIPAT III 25-Aug-16 13:39 25-Aug-16 15:41LINE A/R SUCCESSFUL AT RAIPUR END , BUT TRIPPED AT ONLY SIPAT END ON Y PH - E FAULT,FC-3.66KA,FL-90 KM FROM RAIPUR END.

143 400kV KORBA-BIRSINGHPUR 30-Aug-16 00:57 30-Aug-16 5:41 LINE TRIPPED DUE TO R-PH TO GROUND FAULT, F.L. - 47.9 KMS FROM KORBA, F.C.- 6.365 KA,

144 400kV KORBA-BIRSINGHPUR 30-Aug-16 20:57 30-Aug-16 22:30LINE TRIPPED DUE TO R PH EARTH FAULT AT 51KM FROM KORBA HAVING FAULT CURRENT OF 6.64KAAND 166.5KM FROM BIRSINGHPUR HAVING FAULT CURRENT OF 1.956KA

145 400kV RAIGARH-STERLITE IV 30-Aug-16 15:56 30-Aug-16 16:27LINE TRIPPED DUE TO HEAVY WIND, LIGHTNING, THUNDERSTORM AND HEAVY RAIN , BPH TO E/F, FC-13.7 KA, FL- 124.4 KMS FROM RAIGARH

146 400kV RAIPUR-BHADRAVATI II 30-Aug-16 14:25 30-Aug-16 14:25A/R SUCCESSFULLY OPERATED FROM BOTH ENDS ON Y PH TO E/F. F/C-1.83 KA, F/L- 215 KMS FROMRAIPUR

147 400kV VANDANA-BIRSINGHPUR 30-Aug-16 02:35 30-Aug-16 5:18 LINE TRIPPED DUE TO R-PH TO GROUND FAULT, F.L. - 128.5 KMS FROM BIRSINGHPUR, F.C.- 0.59KA,

148 400kV WARDHA-MAUDA II 30-Aug-16 11:46 30-Aug-16 16:38LINE TRIPPED DUE SCRAP/ GRASS BURNT BY THE FARMER AT LOCATION NO. 222, BELOW THETOWER. HEAVY SMOKE WAS APPEARED CLOSED TO CONDUCTOR & HAS GOT SPARK, Y PH - E FAULT,F.C = 9.0 KA, F.D = 42 KM FROM WARDHA END

149 400kV KORBA-MAHAN 31-Aug-16 14:16 31-Aug-16 17:27LINE TRIPPED ON RPH TO E FAULT. FD-9.230 KMS FC-21.8 KA FROM NTPC KORBA DUE TO HEAVYWIND AND LIGHTNING.

150 400kV WARDHA-MAUDA I 31-Aug-16 16:26 31-Aug-16 19:31LINE TRIPPED ON Y-B PHASE FAULT DURING INSTALLATION OF OPGW IN PLACE OF E/W.FD-4.27 KMSFC-37.5 KA FROM WARDHA END.

151 400kV LARA(NTPC)-KOTRA PS I 3-Sep-16 21:24 3-Sep-16 23:36 LINE TRIPPEDON R-E FAULT , Z1 ,FC-3.0KA,F/L=5.1Km FROM KOTRA PS.

152 400kV LARA(NTPC)-KOTRA PS II 3-Sep-16 21:24 3-Sep-16 23:36 LINE TRIPPED ON R-E FAULT , Z1 ,FC-29.1KA,F/L=5.1Km FROM KOTRA PS.

153 400kV KORADI-SATPURA 6-Sep-16 16:59 6-Sep-16 19:35 BUS BAR PROTECTION OPERATED AT SATPURA END. DT RECEIVED AT KORADI

154 400kV DHARIWAL TPP-PARLI II 7-Sep-16 21:54 8-Sep-16 00:29 REACTOR DIFFERENTIAL PROTECTION, R PH OPERATED AT PARLI END

155 765kV KOTRA PS-DURG PS I 12-Sep-16 2:32 12-Sep-16 3:34LINE TRIPPED ON Y-E, 0KM FROM DURG,13.2KA FROM DURG END. LINE WAS TRIPPED DUE TOFAILURE OF Y-PH-LA AT DURG PS.


DATETRIPPING

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ON DATERESTORATI

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156 400kV BHADRAVATI-DHARIWAL TPP II 13-Sep-16 15:31 13-Sep-16 15:55 LINE TRIPPED ONLY AT DHARIWAL END DUE TO PLCC CARD FAILURE AT DHARIWAL END

157 400kV RAIPUR-WARDHA II 13-Sep-16 14:41 13-Sep-16 14:41 LINE AUTO RECLOSED SUCESSFULLY ON B PH-E FAULT . F.L- 34KM FROM WARDHA . F.C- 8.9KA.

158 400kV RAIPUR-WARDHA II 14-Sep-16 18:06 15-Sep-16 10:58LINE TRIPPED ON 3 PH EARTH FAULT AT 146KM FROM WARDHA HAVING F/C OF 6 KA AND 252KMFROM RAIPUR HAVING FC OF 3.704 KA. 3-PH FAULT WAS DUE TO SNAPPING OF EARTH WIRE ATLOCATION NO:652-653 (AT RIVER CROSSING).

159 400kV AURANGABAD (PG) -AKOLA I 15-Sep-16 19:45 15-Sep-16 20:36LINE TRIPPED AT AKOLA END ONLY. A/R SUCCESSFULLY OPERATED AT A'BAD BUT FAILED AT AKOLAEND. R PH E-FAULT AT 24.75KM FROM A'BAD HAVING FC OF 12.3KA. 226KM FROM AKOLA HAVING FCOF 1.99KA

160 400kV KOLHAPUR (GIS)-MAPUSA I 17-Sep-16 3:43 17-Sep-16 06:30LINE TRIPPED DUE TO BLASTING OF CB POLE AND BUS BAR TRIPPED AT 400KV MSETCL KOLHAPURS/S.

161 400kV KOLHAPUR (MSETCL)- KOLHAPUR (GIS) I 17-Sep-16 3:43 17-Sep-16 05:11LINE TRIPPED DUE TO BLASTING OF CB POLE AND BUS BAR TRIPPED AT 400KV MSETCL KOLHAPURS/S.

162 400kV KOLHAPUR (MSETCL)- KOLHAPUR (GIS) II 17-Sep-16 3:43 17-Sep-16 07:47LINE TRIPPED DUE TO BLASTING OF CB POLE AND BUS BAR TRIPPED AT 400KV MSETCL KOLHAPURS/S.

163 400kV VANDANA-BIRSINGHPUR 18-Sep-16 16:27 18-Sep-16 18:09LINE TRIPPED ONLY AT VANDANA END ONLY ON Y PH-E FAULT.A/R OPERATED AT BIRSINGHPUREND,FC-1.75KA,FL-92.9 KM FROM VANDANA END.

164 400kV BHADRAVATI-PARLI I 21-Sep-16 21:32 22-Sep-16 23:05LINE TRIPPED ON Y PH TO E FAULT,FC-7.3KA,FL-34.3 KM FROM PARLI & FC-1.235KA,FL-338.95 KMFROM BVT END INSULATOR DECAPPED AT LOC 912

165 400kV LARA(NTPC)-KOTRA PS I 21-Sep-16 17:56 21-Sep-16 20:04LINE TRIPPED DUE TO R PH TO EARTH FAULT AT LARA (NTPC) END.F/L=19.98KM,F/C=12KAMP FROMKOTRA.

166 400kV LARA(NTPC)-KOTRA PS II 21-Sep-16 17:56 21-Sep-16 19:22LINE TRIPPED DUE TO R PH TO EARTH FAULT AT LARA (NTPC) END.F/L=19.98KM,F/C=8.4KAMP FROMKOTRA.

167 765kV WARDHA - AURANGABAD(PG) II 23-Sep-16 14:48 23-Sep-16 17:06LINE TRIPPED AT A'BAD ON RELAY MALOPERATION DUE TO DC SOURCE 1 SWITCHED OFF FORMEGGERING. DT RECD BY WARDHA

168 400kV BHILAI-KORADI 24-Sep-16 16:55 24-Sep-16 16:55A/R successful at both end on 400kV Koradi - Bhilai line at 16:55hrs due to R Ph G Fault at 9.8kMfrom Koradi having FC of 11.12kA

169 400kV RAIPUR-BHADRAVATI II 24-Sep-16 19:57 24-Sep-16 19:57A/R successful at both end on 400kV Raipur - BVT ckt-2 at 19:57hrs due to Y Ph G Fault at 218.36kMfrom Raipur having FC of 1.85kA

170 400kV RAIPUR-WARDHA I 24-Sep-16 21:37 24-Sep-16 21:37A/R successful at both end on 400kV Raipur - Wardha ckt-1 at 21:37hrs due to B Ph G Fault at 153kMfrom Wardha having FC of 3.1kA

171 400kV RAIPUR-WARDHA I 24-Sep-16 22:06 25-Sep-16 0:02LINE TRIPPED DUE TO B PHASE TO EARTH FAULT, FC- 5.164KA,FD-84.19KM FROM RAIPUR END &F/L=254.1kM, F.C-2kA FROM WARDHA UNDER ZONE-2.

172 400kV RAIGARH-IBEUL I 27-Sep-16 15:45 28-Sep-16 17:05LINE TRIPPED ON B PHASE TO E FAULT,FC-5.05KA,FL-78.9KM FROM RAIGARH & 6.6 KM FROM IBEULEND.

173 765kV D'JAIGARH-RANCHI I 28-Sep-16 11:50 28-Sep-16 13:29LINE TRIPPED ON DC SUPPLY EARTH FAULT AND DC SUPPLY FLACTUATION RESULT TO GROUP RELAYOPERATED AT DHARAMJAYGARH S/S


DATETRIPPING

TIMERESTORATI

ON DATERESTORATI

ON TIMEREASON

174 765kV DURG PS -WARDHA_2 29-Sep-16 13:16 30-Sep-16 18:34LINE TRIPPED ON B-E, FC-3.0KA,F/D 238KM & F/C=3KA FROM WARDHA . CONDUCTOR SNAPPED ATLOC. 339

ANNEXURE - 3

DATE TIME DATE TIME

1400 KV SINGAJI - CHHEGAON FDR

27.04.2016 16.49 Hrs. 27.04.2016 17.23 Hrs. In service DT received.

2400 KV SINGAJI - JULWANIA FDR

28.04.2016 07.21 Hrs. 28.04.2016 08.44 Hrs. In service Line Tripped due to 'B & C' phase fault, Z-1 optd.

3 400 KV SARNI- ISP FDR 02.04.2016 15.53 Hrs. 02.04.2016 16.47 Hrs. In service Line Tripped due to 'Y' phase fault, Z-1 optd.

4 210 MW unit no. 9 of STPS 06.04.2016 21.00 Hrs. 08.04.2016 09.05 Hrs. NA

Due to stuckup of Generator breaker didn't tripped therefore LBB initiatedand cleared fault through bus bar Zone-1 protection . Following element onBus-I were tripped & cleared the fault :400 KV Sarni-ISP fdr, 400 KV Sarni-Seoni fdr, 400KV Sarni-Ashta fdr-1,400KV Bus Reactor-1, 400KV Bus Coupler, Station transformer-11 andunt#10. The details are as below:

( a ) 400 KV BUS COUPLER 06.04.2016 21.00 Hrs. 06.04.2016 21.14 Hrs. NA Line tripped on Bus bar Zone-1 operated due to Unit 9 Local breaker backup protection operated.

( b ) 400 KV SARNI- SEONI FDR 06.04.2016 21.00 Hrs. 06.04.2016 21.42 Hrs. In service do

( c ) 400 KV SARNI- ISP FDR 06.04.2016 21.00 Hrs. 06.04.2016 21.55 Hrs. In service do

( d ) 400 KV BUS REACTOR-1 (63 MVAR) 06.04.2016 21.00 Hrs. 06.04.2016 22.05 Hrs. NA do

( e ) 400 KV SARNI- ASHTA FDR-I 06.04.2016 21.00 Hrs. 06.04.2016 22.31 Hrs. In service do

5 400 KV SARNI- SEONI FDR 09.04.2016 16.39 Hrs. 09.04.2016 17.15 Hrs. In service Line Tripped due to 'B' phase fault, Main-1 & Main-2 protection optd.



8 220 KV AMK-JABALPUR FDR-II 05.04.2016 14.31 Hrs. 05.04.2016 14.42 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.

9 220 KV AMK-JABALPUR FDR-II 08.04.2016 19.23 Hrs. 08.04.2016 19.32 Hrs. In service Line Tripped due to 'A-N' phase fault, Z-1 optd.

10 220 KV AMK-JABALPUR FDR-II 14.04.2016 11.32 Hrs. 14.04.2016 11.45 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.

11 220 KV AMK-BIRSINGHPUR FDR-III 19.04.2016 11.52 Hrs. 19.04.2016 12.41 Hrs. In service Line Tripped due to 'A-B' phase fault, Z-2 optd.

12 220 KV AMK-JABALPUR FDR-I 20.04.2016 15.22 Hrs. 20.04.2016 16.08 Hrs. In service Line Tripped due to 'AB' phase fault, Z-1 optd.

13 220 KV AMK-JABALPUR FDR-II 20.04.2016 15.24 Hrs. 20.04.2016 15.40 Hrs. In service Line Tripped due to 'BC' phase fault, Z-1 optd.

14 220 KV AMK-PANAGAR FDR 29.04.2016 12.45 Hrs. 29.04.2016 13.09 Hrs. In service Line Tripped due to 'A' phase fault, Z-2 optd.

15 220 KV AMK-BIRSINGHPUR FDR-II 29.04.2016 15.14 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.

S.NO. ELEMENTTRIP RESTORED

A/R STATUS

Faulty Declare

TRIPPING DETAILS OF 400/220 KV SUBSTATIONS during 01.04.2016 TO 30.09.2016

REASONS

16 220 KV AMK-PANAGAR FDR 29.04.2016 15.14 Hrs. In service Line Tripped due to 'A' phase fault, Z-1 optd.

17 220 KV AMK-BIRSINGHPUR FDR-III 29.04.2016 16.04 Hrs. 29.04.2016 20.56 Hrs. In service Line Tripped due to 'A' phase fault, Z-1 optd.

18 220 KV AMK-JABALPUR FDR-I 29.04.2016 21.04 Hrs. 29.04.2016 21.24 Hrs. In service Line Tripped due to 'A' phase fault, Z-1 optd.

19 220 KV BIRSINGHPUR- REWA FDR 15.04.2016 08.46 Hrs. 15.04.2016 09.05 Hrs. Line Tripped due to 'BC' phase fault, Z-1 optd.

20 220 KV BIRSINGHPUR- REWA FDR 15.04.2016 09.40 Hrs. 15.04.2016 10.08 Hrs. Line Tripped due to 'C' phase fault, DPR optd.

21 220 KV BIRSINGHPUR- REWA FDR 19.04.2016 11.56 Hrs. 19.04.2016 12.05 Hrs. Line Tripped due to 'AB' phase fault, Z-4 optd.

22 220 KV BIRSINGHPUR- PALI, I/C-III 19.04.2016 11.56 Hrs. 21.04.2016 12.08 Hrs. Line Tripped due to 'AB' phase fault, Z-1 optd.

23 220 KV BIRSINGHPUR- PALI, I/C-I 19.04.2016 12.12 Hrs. 19.04.2016 13.06 Hrs. Line Tripped due to 'BC' phase fault, Z-2 optd.

24 220 KV BIRSINGHPUR- PALI, I/C-II 19.04.2016 12.12 Hrs. 19.04.2016 13.09 Hrs. Line Tripped due to 'BC' phase fault, Z-2 optd.

25 220 KV BIRSINGHPUR- REWA FDR 19.04.2016 12.12 Hrs. 19.04.2016 12.37 Hrs. Line Tripped due to 'BC' phase fault, Z-4 optd.

26 220 KV BIRSINGHPUR- PALI, I/C-IV 19.04.2016 12.12 Hrs. 19.04.2016 18.46 Hrs. Line Tripped due to 'BC' phase fault, Z-1 optd.

27220 KV BIRSINGHPUR- PALI, I/C-I 21.04.2016 12.23 Hrs. 21.04.2016 16.25 Hrs. Line Tripped due to 'BC' phase fault, Z-2 optd.

28220 KV BIRSINGHPUR- PANAGAR FDR 24.04.2016 12.41 Hrs. 24.04.2016 13.19 Hrs. Line Tripped due to 'R,Y,B' phase fault, Z-1 optd.

29220 KV BIRSINGHPUR- PALI, I/C-I 30.04.2016 10.21 Hrs. 30.04.2016 10.53 Hrs. Line Tripped due to 'A' phase fault, Z-1 optd.

30220 KV SARNI - ITARSI FDR No. 2 22.04.2016 18.39 Hrs. 22.04.2016 19.16 Hrs. Line Tripped due Zone-I, PAT, PE,PD optd.

31220 KV SARNI - Substation I/C No. 2 28.04.2016 12.00 Hrs. 28.04.2016 12.40 Hrs. Line Tripped due PAR, PAS, PE optd.

32 220 KV TONS- KOTAR FDR 22.04.2016 14.35 Hrs. 22.04.2016 15.40 Hrs. Line Tripped due to 'A-N' phase fault, Z1 optd.

33 220 KV TONS- REWA II FDR 20.04.2016 08.00 Hrs. 20.04.2016 08.10 Hrs. Line Tripped due to ' phase to ground fault', DPR optd.

34 400 KV BIRSINGHPUR - KATNI FDR-I 03.05.2016 18.11 Hrs. 03.05.2016 19.53 Hrs. In service DT received.

35 400 KV BIRSINGHPUR - KATNI FDR-II 03.05.2016 18.11 Hrs. 03.05.2016 20.10 Hrs. In service DT received.






41 400 KV BIRSINGHPUR - KATNI FDR-I 21.05.2016 17.23 Hrs. 25.05.2016 20.38 Hrs. In service Line tripped due to overvoltage.



44 400 KV BIRSINGHPUR - KATNI FDR-II 28.05.2016 17.16 Hrs. In service DT received.Not charged till date

Faulty Declare

45 400 KV SARNI- ISP FDR 09.05.2016 17.14 Hrs. 09.05.2016 18.18 Hrs. In service Line Tripped due to 'R' phase fault, Z-1 optd.Main-1 & Main-2 protection optd.

46 400 KV SARNI- ISP FDR 18.05.2016 02.20 Hrs. 18.05.2016 03.34 Hrs. In service DT received.

47 220 KV AMK-SIDHI FDR 05.05.2016 18.19 Hrs. 05.05.2016 18.33 Hrs. In service Line Tripped due to 'A-N' phase fault, Z-1 optd.

48 220 KV AMK-JABALPUR FDR-I 06.05.2016 21.04 Hrs. 06.05.2016 21.30 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.

49 220 KV AMK-JABALPUR FDR-I 09.05.2016 06.02 Hrs. 09.05.2016 06.17 Hrs. In service Line Tripped due to 'C-N' phase fault, Z-2 optd.


51 220 KV AMK-PANAGAR FDR 09.05.2016 18.58 Hrs. 09.05.2016 19.20 Hrs. In service Line Tripped due to 'C-N' phase fault, Z-1 optd.

52 220 KV AMK-SIDHI FDR 22.05.2016 19.02 Hrs 22.05.2016 19.24 Hrs In service Line Tripped due to 'A' phase fault, Z-1 optd.

53 220 KV AMK-JABALPUR FDR-II 24.05.2016 17.07 Hrs. 24.05.2016 17.19 Hrs In service Line Tripped due to 'C-N' phase fault, Z-1 optd.

54 220 KV AMK-JABALPUR FDR-II 25.05.2016 13.53 Hrs. 25.05.2016 14.32 Hrs In service Line Tripped due to 'C-N' phase fault, Z-1 optd.

55 220 KV BIRSINGHPUR- REWA FDR 02.05.2016 12.20 Hrs. 02.05.2016 12.55 Hrs. Line Tripped due to 'C' phase fault, Z-2 optd.

56 220 KV BIRSINGHPUR- PANAGAR FDR 02.05.2016 12.56 Hrs. 02.05.2016 13.50 Hrs. Line Tripped due to 'R-N' phase fault, Z-1 optd.


58 220 KV BIRSINGHPUR- AMK-III FDR 03.05.2016 14.20 Hrs. 03.05.2016 14.30 Hrs. Line Tripped due to 'A' phase fault, Z-1 optd.


60 220 KV BIRSINGHPUR- PANAGAR FDR 09.05.2016 18.58 Hrs. 09.05.2016 19.30 Hrs. Line Tripped due to 'C' phase fault, Z-1 optd.

61 220 KV BIRSINGHPUR- PANAGAR FDR 15.05.2016 17.09 Hrs. 15.05.2016 17.40 Hrs. Line Tripped due to 'C' phase fault, Z-2 optd.

62 220 KV BIRSINGHPUR- PALI, I/C-II 18.05.2016 14.57 Hrs. 18.05.2016 15.52 Hrs. Line Tripped due to directional E/F relay 67 NX optd.

63 220 KV BIRSINGHPUR- PALI, I/C-III 18.05.2016 14.57 Hrs. 18.05.2016 15.53 Hrs. Line Tripped due to directional E/F relay 67 NX optd.

64 220 KV BIRSINGHPUR- PALI, I/C-IV 18.05.2016 14.57 Hrs. 18.05.2016 15.54 Hrs. Line Tripped due to directional E/F relay 67 NX optd.



67 220 KV SARNI - SUB STATION I/C No. 2 04.05.2016 19.09 Hrs. 04.05.2016 19.57 Hrs. Line Tripped due PAR, PAT, Inst.O/C ' R & B' phase optd .

68220 KV SINGAJI - CHHEGAON FDR-I





20.05.2016 18.29 Hrs. 20.05.2016 20.10 Hrs. In service Bus bar protection operated.

71220 KV SINGAJI - CHHEGAON FDR-II

20.05.2016 18.29 Hrs. 23.05.2016 18.50 Hrs. In service DT received,

72 220 KV TONS- REWA FDR- II 04.05.2016 21.44 Hrs. 06.05.2016 22.29 Hrs. Line Tripped due to 'C-N' phase fault.

73 220 KV TONS- REWA FDR- II 04.05.2016 22.35 Hrs. 06.05.2016 19.10 Hrs. Line Tripped due to ' phase to ground fault', Z-1 optd,

74 105 MW TONS HPS GENERATOR UNIT # 3 08.05.2016 19.50 Hrs. At the time of Hand Tripping of unit#3, Pole descripiency trip occurred, consequentlyBus bar protection optd.

75 220 KV TONS- KOTAR FDR 23.05.2016 14.22 Hrs. 24.05.2016 13.36 Hrs. Line Tripped due to 'A-N' phase fault, Z-1 optd.

76 220 KV TONS- REWA FDR- II 23.05.2016 14.50 Hrs. 23.05.2016 17.40Hrs.

i 220 KV TONS- REWA FDR- I 23.05.2016 14.50 Hrs. 23.05.2016 17.38 Hrs.

ii 220 KV TONS- SATNA FDR 23.05.2016 14.50 Hrs. 23.05.2016 17.46 Hrs.

77 400 KV SARNI- ISP FDR 04.06.2016 12.18 Hrs. 04.06.2016 13.49 Hrs. In service DT received.

78 400 KV SARNI- ICT 22.06.2016 13.10 Hrs. 22.06.2016 15.02 Hrs. In serviceAt 13.10 Hrs. in 220 KV SST interconnector-1 tripped on fault and simultaneously

400KV/220KV I.C.T. both side C.B. tripped on 220KV side 'B- phase' instantaneousBack up over current protection operated.

79 400 KV SARNI- KORADI FDR 25.06.2016 14.58 Hrs. 25.06.2016 21.42 Hrs. In service Line Tripped due to 'R' phase fault, , Main-1/2 protection, Z-2 optd.

80 400 KV SARNI- ASHTA FDR-2 28.06.2016 19.47 Hrs. 28.06.2016 20.51 Hrs. In service Line Tripped due to 'B-N' phase fault, , Z-1 optd.


82 400 KV BIRSINGHPUR - KATNI FDR-I 19.06.2016 02.08 Hrs. 19.06.2016 02.43 Hrs. In service O/V trip, Master trip, DT send.

83 400 KV BIRSINGHPUR - KATNI FDR-I 20.06.2016 02.29 Hrs. 26.06.2016 22.26 Hrs. In service O/V trip, Master trip, DT send.


85 400 KV BIRSINGHPUR - KATNI FDR-II 30.06.2016 01.59 Hrs. In service DT received.

86 220 KV SARNI - SUB STATION I/C No. 1 22.06.2016 13.10 Hrs. 22.06.2016 14.10 Hrs.Line Tripped due to Electromagnetic relay & DPR PD, PAT, PTaW, PSW, optd.

87 220 KV TONS- REWA FDR- II 18.06.2016 12.37 Hrs. 18.06.2016 12.58 Hrs. Line Tripped due to 'B-N' phase fault.



90 220 KV BIRSINGHPUR- REWA FDR 24.06.2016 15.05 Hrs. 24.06.2016 17.18 Hrs. Line Tripped due to 'A' phase fault, Z-1 optd.


92 400 KV SARNI- ITARSI FDR 08.07.2016 19.00 Hrs. 08.07.2016 19.38 Hrs. In service Line Tripped due to 'R' phase fault, , Main-1 protection, Z-1 optd.

93 400 KV SARNI- ICT 22.07.2016 03.15 Hrs. 22.07.2016 11.27 Hrs. In service

At 03.15 Hrs. 400KV/220KV I.C.T. got tripped from 400 KV side on pole descripiancy.After getting permission from L/D, ICT synchronised from 400 KV side at 03.25 Hrs butagain tripped at 03.56 Hrs. on pole descripancy at 400 KV side at that incident 220 KVside CB hand tripped at 04.04 Hrs. for thorough checking. On checking it was foundthat one number cable core became earthed in pole descripiancy circuit. Problemattended by using spare core of the cable. After clearance from L/D, ICT charged from220 KV side and synchronised from 400 KV side at 11.27 Hrs. Dt.22.07.2016.

94 400 KV SARNI- ASHTA FDR-2 08.07.2016 18.59 Hrs. 21.07.2016 12.46 Hrs. In service Line Tripped due to 'Reactor Backup Impedance protection' optd.

95 400 KV BIRSINGHPUR - KATNI FDR-I 01.07.2016 12.59 Hrs. In service DT received.


97 220 KV SARNI - SUB STATION I/C No. 2 11.07.2016 22.41 Hrs. 12.07.2016 15.37 Hrs. Line Tripped due to Circuit breaker control circuit fault.

Line Tripped due to 'A-N' phase fault. Fault occurred due to lighting cable ofTower lighting of switch yard fallen on 220 KV Bus-2 ( Bus-1 under permit),

Fdr is not charged till now

Fdr is not charged till now

98 220 KV SARNI - SUB STATION I/C No. 1 13.07.2016 12.56 Hrs. 13.07.2016 13.54 Hrs. Line Tripped due to Electromagnetic relay & DPR PD, PAT, Z-1 optd.

99 220 KV SARNI - SUB STATION I/C No. 2 20.07.2016 03.45 Hrs. 20.07.2016 18.04 Hrs. Line Tripped due to Circuit breaker control circuit fault.


101 220 KV BIRSINGHPUR- AMK-III FDR 16.07.2016 12.26 Hrs. 16.07.2016 16.15 Hrs. Line Tripped due to '186A & 186B Lock out' optd.

102 220 KV BIRSINGHPUR- PALI, I/C-II 20.07.2016 12.54 Hrs. 20.07.2016 13.33 Hrs. Line Tripped due to 'BC' phase fault, Z-1 optd.

103 220 KV BIRSINGHPUR- PANAGAR FDR 23.07.2016 10.13 Hrs. 23.07.2016 10.53 Hrs. Line Tripped due to 'R' phase fault, Z-4 optd.

104 220 KV BIRSINGHPUR- AMK-II FDR 23.07.2016 10.13 Hrs. 23.07.2016 17.17 Hrs. Line Tripped due to 'B' phase fault, Z-1 optd.


106 220 KV AMK-SIDHI FDR 08.07.2016 21.41 Hrs. 08.07.2016 21.56 Hrs. In service Line Tripped due to 'AN' phase fault, Z-1 optd.

107 220 KV AMK-JABALPUR FDR-II 10.07.2016 04.26 Hrs. 10.07.2016 04.35 Hrs. In service Line Tripped due to 'A' phase fault, Z-1 optd.


109 220 KV AMK-BIRSINGHPUR FDR-III 20.07.2016 12.55 Hrs. 20.07.2016 13.44 Hrs. In service Line Tripped due to 'B-C' phase fault, Z-2 optd.

110 220 KV TONS- SATNA FDR 10.07.2016 12.45 Hrs. 10.07.2016 13.15 Hrs. Line Tripped due to 'C-N' phase fault, BB Protn. Z-4 optd.

111 220 KV TONS- REWA FDR-I 10.07.2016 12.45 Hrs. 10.07.2016 13.25 Hrs. Line Tripped due to 'C' phase fault, BB Protn. optd.

112 220 KV TONS- KOTAR FDR 10.07.2016 12.45 Hrs. 10.07.2016 13.17 Hrs. Line Tripped due to 'C-N' phase fault, BB, Dist. Protn, Z-1 optd.

113 105 MW TONS HPS GENERATOR UNIT # 2 19.07.2016 16.15 Hrs.

'Y phase pole' of GT#2 main breaker damaged at the time of stopping of unit #2 hencebus bar protection operated, consequently 220 KV Tons-Kotar fdr, Tons- Rewa fdr IItripped as these are on same bus and 220 KV Bus coupler also tripped .Bus barprotection optd. The details are as follows:

i 220 KV TONS- KOTAR FDR 19.07.2016 16.15 Hrs. 19.07.2016 17.00 Hrs. Line Tripped due to 'E/F relay' , Dist. Protn. optd.

ii 220 KV TONS- REWA FDR-II 19.07.2016 16.15 Hrs. 19.07.2016 16.55 Hrs. Line Tripped due to 'E/F relay' , Dist. Protn. optd.

114 220 KV TONS- SATNA FDR 23.07.2016 17.50 Hrs. 23.07.2016 18.08 Hrs. Line Tripped due to 'A-N' phase fault, Z-1 optd.

115 220 KV TONS- KOTAR FDR 30.07.2016 13.45 Hrs. 30.07.2016 14.36 Hrs. Line Tripped due to 'C' phase fault, Z-1 optd.

116 400 KV SARNI- ISP FDR 17.08.2016 16.46 Hrs. 18.08.2016 10.01 Hrs. In service

Line Tripped due to 'Y' phase fault, , Main-1 & II protection, Z-1 optd.Line charged from ISP end, Line immediately tripped on same fault. Onchecking by Transmission division, Disc Insulator found burst at location no.125 in 'Y' phase and same has been replaced.

117 400 KV SARNI- ISP FDR 24.08.2016 12.58 Hrs. 24.08.2016 14.05 Hrs. In service Line Tripped due to 'Y' phase fault, , Main-1 & II protection, Z-1 optd.


119 220 KV SARNI - SUB STATION I/C No. 1 02.08.2016 11.44 Hrs. 02.08.2016 20.22 Hrs. Line Tripped due to DPR, Z-1 optd.

120 220 KV SARNI - HANDIA FDR 02.08.2016 11.44 Hrs. 03.08.2016 20.20 Hrs. Line Tripped due to O/C 'A' Phase, Zone-1 optd.

121 220 KV SARNI - ITARSI FDR-II 30.08.2016 21.47 Hrs. 30.08.2016 22.41 Hrs. Line Tripped due to O/C 'A' Phase, Zone-2 optd.

122 220 KV BIRSINGHPUR- AMK-II FDR 12.08.2016 11.06 Hrs. 12.08.2016 11.30 Hrs. Line Tripped due to 'A-N' phase fault, Z-1 optd.

123 220 KV BIRSINGHPUR- REWA FDR 04.08.2016 12.03 Hrs. 04.08.2016 12.43 Hrs. Line Tripped due to 'B-C' phase fault, Z-2 optd.





128 220 KV AMK-SIDHI FDR 04.08.2016 12.16 Hrs. 04.08.2016 12.37 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.



131 220 KV AMK-SIDHI FDR 17.08.2016 19.27 Hrs. 17.08.2016 20.27 Hrs. In service Breaker tripped due to Air pressure low, 86 X optd.

132 220 KV AMK-PANAGAR FDR 17.08.2016 23.18 Hrs. 17.08.2016 23.27 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.


134 220 KV AMK-TRACTION FDR-II 24.08.2016 11.06 Hrs. 24.08.2016 11.35 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.



137 220 KV AMK-PANAGAR FDR 27.08.2016 05.28 Hrs. 27.08.2016 05.50 Hrs. In service Line Tripped due to 'C' phase fault, Z-1 optd.

138 220 KV AMK-PANAGAR FDR 29.08.2016 15.18 Hrs. 29.08.2016 15.33 Hrs. In service Line Tripped due to 'A-N' phase fault, Z-1 optd.

139 220 KV TONS- REWA FDR-II 27.08.2016 04.29 Hrs. 27.08.2016 04.48 Hrs. Line Tripped due to 'C-N' phase fault, Z-1 optd.

140 400 KV SARNI- ASHTA FDR-II 17.09.2016 01.09 Hrs. 17.09.2016 02.53 Hrs. In service

On dated 17/09/16 at 1:09:08 Hrs 400 kV Ashta-II circuit was tripped onZone-1 protection (B-phase tripped ) at 78.3 kms from Ashta End ,Autoreclose occurred at Ashta end however at Sarni end Due to problem inSCADA Autoreclose didnot occured and feeder was tripped on Line Breaker-pole discrepancy operated. After clearance from LD feeder wassynchronisedffrom Sarni end at 02:53 Hrs on dated 17.09.16.

141 400 KV SARNI- ITARSI FDR 06.09.2016 16.59 Hrs. 06.09.2016 19.15 Hrs. In service

142 400 KV SARNI- KORADI FDR 06.09.2016 16.59 Hrs. 06.09.2016 19.31 Hrs. In service

143 400 KV SARNI- ISP FDR 27.09.2016 10.38 Hrs. 27.09.2016 10.58 Hrs. In service Line Tripped due to 'B' phase fault, Main-1 & II protection, Z-1 optd.

144 400 KV SARNI- ISP FDR 28.09.2016 10.04 Hrs. 28.09.2016 10.20 Hrs. In service Line Tripped due to 'B' phase fault, , Main-1 & II protection, Z-1 optd.

145 400 KV SARNI- ISP FDR 29.09.2016 13.15 Hrs. 29.09.2016 13.25 Hrs. In service Line Tripped due to 'B' phase fault, , Main-1 & II protection, Z-1 optd.

146 220 KV Singaji- Chhegaon 17.09.2016 03.29 Hrs. 17.09.2016 04.32 Hrs. In service DT received.

147 220 KV SARNI - HANDIA FDR 17.09.2016 01.45 Hrs. 18.09.2016 11.56 Hrs. Line Tripped due to O/C 'B' Phase, Zone-1 optd.


149 220 KV BIRSINGHPUR- AMK-III FDR 07.09.2016 23.00 Hrs. 08.09.2016 00.30 Hrs. Line Tripped due to Bus Bar Z-2 optd.

On dated 06/09/16 at 16:59 Hrs 400 kV 400 KV Bus reactor No.-2(63 MVAR) Back up impedance Y & B phase operated. The C.B. of Bus reactor-2 didn't open timaly causing LBB to operate, which is turn causes Bus Bar

150 220 KV BIRSINGHPUR- REWA FDR 07.09.2016 23.00 Hrs. 08.09.2016 01.25 Hrs. Line Tripped due to Bus Bar Z-2 optd.

151 220 KV BIRSINGHPUR- PALI Interconnector-I 13.09.2016 13.10 Hrs. 13.09.2016 13.35 Hrs. Line Tripped due to 'A' phase fault, Z-1 optd.

152 220 KV BIRSINGHPUR- PALI Interconnector-II 13.09.2016 13.10 Hrs. 13.09.2016 17.21 Hrs. Line Tripped due to 'A' phase fault, Directional E/F 67 NX Relay optd.Z-1optd.



155 220 KV BIRSINGHPUR- REWA FDR 19.09.2016 17.31 Hrs. 19.09.2016 17.45 Hrs. Line Tripped due to 'B' phase fault, Z-2 optd.

156 220 KV BIRSINGHPUR- AMK-II FDR 20.09.2016 13.35 Hrs. 20.09.2016 14.35 Hrs. Line Tripped due to 'A&C' phase fault, Z-1 optd.


158 220 KV BIRSINGHPUR- PANAGAR FDR 29.09.2016 23.42 Hrs. 30.09.2016 00.20 Hrs. DPR optd.

159 220 KV BIRSINGHPUR- PALI Interconnector-III 29.09.2016 23.42 Hrs. 30.09.2016 00.30 Hrs. Line Tripped due to 'C' phase fault, Z-1 optd.

160 220 KV BIRSINGHPUR- PALI Interconnector-IV 29.09.2016 23.42 Hrs. 30.09.2016 00.45 Hrs. Line Tripped due to 'B' phase fault, Z-1 optd.


162 220 KV AMK-PANAGAR FDR 09.09.2016 14.52 Hrs. 09.09.2016 15.14 Hrs. In service Line Tripped due to 'A-N' phase fault, Z-2 optd.


164 220 KV AMK-SIDHI FDR 19.09.2016 18.16 Hrs. 19.09.2016 18.33 Hrs. In service Line Tripped due to 'B-N' phase fault, Z-2 optd.



167 220 KV AMK-BIRSINGHPUR FDR-III 29.09.2016 23.46 Hrs. 30.09.2016 00.01 Hrs. In service Line Tripped due to 'BC-N' phase fault, Z-1 optd.

168 220 KV AMK-JABALPUR FDR-II 30.09.2016 11.26 Hrs. 30.09.2016 11.55 Hrs. In service Line Tripped due to 'C-N' phase fault, Z-1 optd.

169 220 KV TONS- KOTAR FDR 15.09.2016 16.32 Hrs. 15.09.2016 17.00 Hrs. Line Tripped due to 'A C-N' phase fault, Z-1 optd.

170 220 KV TONS- SIRMOUR FDR 15.09.2016 16.32 Hrs. 15.09.2016 17.49 Hrs. Line Tripped due to 'A C-N' phase fault, Check Zone Bus Bar Protection optd.

171 220 KV TONS- SATNA FDR 15.09.2016 16.32 Hrs. 15.09.2016 17.55 Hrs. Line Tripped due to 'A C-N' phase fault, Z-1 optd.


173 220 KV TONS- SIRMOUR FDR 20.09.2016 14.58 Hrs. 20.09.2016 15.13 Hrs. Line Tripped due to 'A-N' phase fault, Z-1 optd.


175 220 KV TONS- REWA FDR-II 27.09.2016 00.46 Hrs. 27.09.2016 01.01 Hrs. Line Tripped due to 'C-N' phase fault, Z-1 optd.

Report of Black out at CGPL on 13.07.2016

Introduction:

A complete blackout at CGPL took place on 13.07.2016. A group comprising of

CGPL, GETCO, Powergrid WR-II, WRLDC and WRPC officers met at Vadodara on

18.07.2016 to discuss the blackout.

List of participants in the meeting is enclosed at Annexure-1.

The description of the blackout is described next. Finally, conclusions &

recommendations of the group are presented.

The outcome of the report shall be put up to PCM forum of WRPC.

1. Brief summary on occurrence:

The occurrence of complete blackout of CGPL can be analysed by separating it into

three events which occurred one after the other. The first event started at Varsana Sub-station

at 20:29 Hrs on 12th July 2016 which led to Bus 1 tripping along with associated element due

to bus fault. The primary reason was insulator tracking in the switchyard of Varsana Sub-

station. This was followed by second event at 21:49Hrs, where again due to insulator tracking

at another location at Varsana Sub-station, the fault occurred on 400 kV Bus 2 resulting in

loss of all 400 kV elements from 400/220 kV Varsana sub-station. After getting clearance

from Gujarat SLDC/GETCO and PGCIL, 400 kV Varsana-Bhachau 1 circuit was being

charged from Bhachau end to energize the 400 kV Bus of Varsana at 02:37 Hrs on 13th July

2016. However, after charging of line from Bhachau end and before synchronizing it from

Varsana end, fault appeared at Varsana end near the gantry of this circuit. The fault first

appeared in Y phase followed by conversion into three phase fault. This fault was sensed in

Zone 2 from Bhachau end relay. 400 kV CGPL-Bhachau 1 from CGPL end and 400 kV

Bhachau-Ranchodpura 1 & 2 from Ranchodpura end also tripped in Zone 2 before tripping of

400 kV Varsana-Bhachau 1 line from Bhachau end, at about same time. Power swing

observed on remaining lines from CGPL and 220 kV Bhachau-Morbi circuit and the lines

eventually tripped on Zone-1 power swing trip, causing complete blackout at CGPL. CGPL

units also tripped in Out of Step condition. The loss of generation at CGPL was of the order

of 2875 MW. The loss of CGPL generation resulted in frequency fall causing df/dt based load

shedding operation in Gujarat system. Preliminary assessment of the amount of df/dt based

load shedding as intimated by GETCO was 119 MW.


Since there was a complete generation loss of around 2875 MW at CGPL an UMPP

station it required a detailed analysis using all the available data from sub-

station/SLDC/RLDC. A meeting was held at PGCIL Vadodara on 18.07.2016 to look into the

matter, based on the available input received from various utilities. The occurrence has been

subdivided into three events viz;

1. Event 1 : Outage of 400 kV Bus 1 at 400/220 kV Varsana Substation

2. Event 2 : Outage of 400 kV Bus 2 at 400/220 kV Varsana Substation

3. Event 3 : CGPL Blackout while charging of 400 kV Bhachau-Varsana 1.

2. System condition prior to Incident:

The single line diagram showing important lines connecting two major generating stations

(CGPL & APL) is given below

The generation of CGPL was around 2878 MW (Unit-10: 760 MW, Unit-30: 742 MW,

Unit 40: 757 MW & Unit 50: 619 MW).


The evacuation from CGPL was through the following lines.

(1) 400 KV CGPL-Jepur 1 & 2 : 799 MW

(2) 400 KV CGPL-Chorania : 466 MW

(3) 400 KV CGPL-Mansar : 510 MW

(4) 400 KV CGPL-Bhachau 1 & 2 : 1092 MW

The load flow pattern at 2.37.08 Hrs. i.e. after event 1 and before event 2 took place is as

shown below.


3. Event 1: Tripping of 400 kV Bus 1 at 400/220 kV Varsana Substation

3.1. Antecedent condition at 20:24 Hrs on 12th July 2016

Prior to the event the weather was a foggy and it was raining around 400/220 kV Varsana

substation. Arcing, corona & tracking were continuously observed in the substation. In

Gujarat system, 400 kV Chorania-Asoj 1 and 400 kV Kasor-Rajgarh 1 were out on breaker

problem at Choronia end and high voltage control respectively. The Bus arrangement at

400kV Varsana, at 20:24 Hrs on 12th July 2016 is as tabulated below. The Bus bar

arrangement at 400 and 220 kV Varsana prior to event is shown in figure 1(a) & (b).

Bus bar arrangement at 400 kV Varsana:

400 kV Bus 1 400 kV Bus 2

400 kV Varsana-Kansari400 KV Varsana-

Bhachau-2

50 MVAR Bus Reactor 1125 MVAR Bus

Reactor 2

400/220 kV 315 MVA ICT 1400/220 kV 315

MVA ICT 2

400 kV Varsana-Hadala

400 kV Varsana-APL 1

400 kV Varsana-APL 2

400 kV Varsana-Bhachau 1

400/220 kV 315 MVA

ICT 3


Figure 1(a): 400 kV Bus of 400/220 kV Varsana Substation at 20:29 Hrs

Figure 1(b): 220 kV Bus of 400/220 kV Varsana Substation at 20:29 Hrs. (400/220 kV

ICT 3 not modelled in 220 kV Varsana SLD)

3.2. 400 kV Bus 1 fault at Varsana at 20:29 Hrs

Due to the insulator tracking, bus fault occurred on 400 kV Bus 1 causing tripping of all

connected elements on 400 kV Bus 1 and Bus coupler. The fault was in Y phase.


400 kV Bus 1 bus bar protection operated leading to tripping of all 400 kV Lines/ICTs along

with the bus coupler at Varsana. The details of elements tripped are as following:

1. 400 kV APL-Varsana 1

2. 400 kV Varsana-Kansari (Zerda)

3. 400 kV Varsana-Hadala

4. 400 kV Varsana-Bhachau 1


6. 400/220 kV 315 MVA ICT 1

7. 400/220 kV 315 MVA ICT 3

8. 50 MVAR Bus Reactor 1

Further, due to tripping of 400/220 kV Varsana ICT 3 (where 300 MW OPGS Unit 1 is

connected radially to 220 kV Bus of ICT through 220kV OPGS-Varsana circuits), OPGS

Unit 1 generating 87 MW also got tripped.

3.3. Post Event Scenario after Event 1 at 20: 35 Hrs.

The status of elements after the tripping of 400kV Bus 1 is as shown in Fig 2(a) & (b).

Figure 2 (a): 400 kV Bus of 400/220 kV Varsana Substation after 400 kV Bus 1 Outage.


Figure 2(b): 220 kV Bus of 400/220 kV Varsana Substation after 400 kV Bus 1 Outage.

3.4. Restoration of the system

As the fault was due to the tracking of bus post insulator so, 400 kV Bus 1 remained out

at Varsana. GETCO/Gujarat SLDC after ensuring the healthiness of 400 kV Varsana-Hadala

ckt., took it on 400 kV Bus 2 at 21:41 Hrs. Remaining 400 kV lines, bus coupler, 400/220

kV ICTs and 400 kV Bus 1 remained out of service.

4. Event 2: Tripping of 400 kV Bus 2 at 400/220 kV Varsana Substation

4.1. Antecedent Condition prior to 21:49 Hrs

400 kV Bus 1 of Varsana was out of service due to the fault and persistent tracking at

Varsana sub-station.

4.2. 400 kV Bus 2 Fault at Varsana at 21:49 Hrs

At 400 kV Bus of Varsana sub-station, Bus 2 also tripped at 21:50 Hrs on Bus bar protection

operation with Y phase to earth fault due to persistent tracking on insulators. The Y phase

fault was observed. The following elements connected to Bus-2, tripped at 400/220 kV

Varsana sub-station.

1. 400 kV Varsana-Hadala



3. 400/220 kV 315 MVA ICT 2

4. 125 MVAR Bus Reactor 2

4.3. Post Event Scenario after Event 2 at 21:55 Hrs

Both the 400 kV Buses at 400/220 kV Varsana substation became dead. The status of 220kV

Bus at 400/220kV Varsana S/S was as shown in fig 3.

Figure 3: 220 kV Bus of 400/220 kV Varsana Substation after both 400 kV bus

becoming dead.


It was intimated by Gujarat SLDC that after cleaning of the post insulator at the 400 kV

Varsana substation, 400 kV Bhachau-Varsana 1 was ready for charging.

5. Event 3: CGPL Blackout while charging of 400 kV Bhachau-Varsana 1

5.1. Antecedent Condition at 02:30 Hrs on 13th July 2016

Prior to the charging of 400 kV Bhachau-Varsana 1 circuit system condition at 02:30 Hrs on

13 July was as shown in figures 4 -7. Prior to this event following circuits were out in Gujarat

System:

1. 400 kV Chorania-Asoj 1: Out since 30th June 2016 due to breaker problem at

Chorania end (At Choronia end TBC has been used for charging of Bus reactor 2)

2. 400 kV Kansari-Ranchropura 2:

3. 400 kV Rajgarh-Kasor 1: On High Voltage control since 9th July 2016 at 17:42 Hrs.


4. 765 kV Vadodara-Dhule S/C: On High Voltage control since 12th July 2016 at 22:15

Hrs.

5. 400 kV Chorania-Ranchodpura 1: On High Voltage control since 12th July 2016 at

23:51 Hrs.

6. 400 kV Amreli-Jetpur 2: On High Voltage control since 12th July 2016 at 23:55 Hrs.

7. 400 kV Kosamba-Chorania 2: On High Voltage control since 13th July 2016 at 00:06

Hrs.

Figure 4: Gujarat system at 02:30 Hrs i.e. prior to blackout of CGPL.


Figure 5: CGPL Bus at 02:30 Hrs

Figure 6: Bhachau 400 kV Bus at 02:30 Hrs


Figure 7: Bhachau 220 kV Bus at 02:30 Hrs

5.2. Blackout at CGPL at 02:37 Hrs

At 02:37 Hrs, 400 kV Bhachau-Varsana 1 was charged from Bhachau end. However after 7

seconds of the charging of the line, initially fault developed in Y phase followed by its

conversion to three phase fault at the gantry end of this line at Varsana end. The PMU plot of

Dehgam is as shown in figure 8.


Figure 8: 400 kV Dehgam Bus voltage observed from the PMU indicating initially Y

phase followed by three phase fault.

It was found that all the remaining lines from CGPL tripped along with 400 kV Bhachau-

Ranchodpura D/C, 220 kV Bhachau-Morbi. This caused blackout of CGPL and tripping of all

its running units.

List of Tripped elements during the event are as following:

1. Bhachau – Varsana 1 on Zone 2 protection seen from Bhachau end.

2. 400 kV CGPL-Bhachau 1 on Zone 2 protection seen from CGPL end

3. 400 kV CGPL-Mansar

4. 400 kV CGPL-Chorania

5. 400 kV CGPL-Jetpur 1 & 2

6. 400 kV Bhachau-Ranchodpura 1 & 2 on Zone 2 protection seen from Ranchodpura

end.

7. 400 kV Bhachau-Essar Vadinar 1 & 2 (Idle changed from Bhachau)

8. 220 kV Bhachau-Morbi

9. CGPL Unit 10, 30, 40 and 50 on Out of Step protection.

Generation Loss: Due to this event, generation loss of 2875 MW of CGPL occurred with

tripping of Unit 10, 30, 40 and 50.

Load Loss: Due to the event of loss of large generation, frequency drop was fast which has

resulted in the df/dt based load shedding relays operation in Gujarat system. Frequency and

Rate of change of frequency observed in various states of WR from PMUs is shown in figure

9 and 10 respectively. It can be observed that in Gujarat, the df/dt observed is more than 0.2

Hz/sec for considerable amount of time due to nearness of the event causing operation of

ROCOF based load shedding scheme.


Figure 9: Rate of Change Frequency observed in Gujarat and Maharashtra during the

event of CGPL Blackout from PMUs.

Figure 10: Rate of Change Frequency observed in Madhya Pradesh and Chhattisgarh

of WR during the event of CGPL Blackout from PMUs.

Frequency drop during the event: Due to loss of generation followed by df/dt based load

shedding frequency dropped from 49.9685 Hz to 49.7385 Hz i.e. a drop by 0.23 Hz. This can

be observed from the frequency plot from various PMU in figure 11. It can also be observed

that frequency has restored within 10 minutes of the incident to its initial value.


Figure 11: Frequency drop during the event of blackout of CGPL from various PMUs.

5.3. Analysis of the Event

5.3.1. Event Analysis from Gujarat SLDC for Bus fault at Varsana (Event 1 & 2)

There was a foggy and rainy atmosphere at 400/220 kV Varsana substation and arcing,

corona & tracking were continuously observed in the substation. The bus bar operation of

Alstom make Micom P741-743 at 20.29 hrs. for 400 kV Bus 1 and at 21.50 for 400 kV Bus 2

was due to arcing and chattering observed in bus coupler bay P.I and adjacent bays. 30 kA of

differential current in Y-phase was recorded in the Central Unit of the bus bar scheme during

bus fault of 400 kV Bus 1 at 20:29 Hrs. 15 kA of differential current in Y-phase was recorded

in the Central unit of the bus bar scheme at 21.50 hrs during bus fault on 400 kV Bus 2. DR

files of Bus bar protection are placed at Annexure 3.

5.3.2. Inferences from the Disturbance Recorder Files and PMU data for Event 3:

The disturbance recorder files for event 3 are placed at Annexure 3 were analysed in details

and with the help of this DR, time line of event 3 has been prepared.

The whole event can be described as follows:

Event started with a Y phase fault followed by three phase fault on the 400 kV Bhachau-

Varsana 1 circuit. The fault was located outside the gantry of 400 kV Varsana sub-station.


Flash over were found in wave trap R & B phase and BPI between CVT & LA of Y-

Phase of the circuit at Varsana Sub-station. The fault has occurred at around 7 seconds of

the charging of line from Bhachau end.

The fault on the 400 kV Bhachau-Varsana 1 was seen in zone 2 by Bhachau end. The

time delay at this end for zone 2 is kept as 350 ms as per Ramakrishna committee

recommendation.

The Fault was sensed in Zone 2 by 400 kV CGPL-Bhachau D/C at CGPL end; 400 kV

Bhachau-Ranchodpura D/C at Ranchodpura end.

The time delay for Zone 2 at CGPL end for 400 kV CGPL-Bhachau and at Ranchropura

end for 400 kV Bhachau-Ranchodpura D/C were kept at 300 ms.

As per the Ramakrishna committee report the time delay for these lines should be more

than 350 ms in view that these lines are long lines followed by short lines to avoid

undesirable tripping in case of fault on short line.

After 371 ms of the fault, 400 kV CGPL-Bhachau 1 tripped in Zone 2 from CGPL end (

300 ms zone 2 and 71 ms for Breaker opening).immediately 400 kV Bhachau-

Ranchodpura D/C also tripped in zone 2 from Ranchodpura end ( 300 ms for Zone 2 and

75 ms for breaker opening)

The CGPL generators which were already under forced AVR response due to the three

phase fault, also experienced the power swing with the tripping of 400 kV Bhachau-

CGPL 1 and 400 kV Bhachau-Ranchropura D/C .

The fault in 400 kV Bhachau-Varsana 1 got cleared from the system at 409 ms ( 350 ms

zone 2 and 59 ms for breaker operation time)

The CGPL voltage during the event of fault and after the fault is shown in figure 12 as

taken from DR of 400 kV CGPL-Bhachau 2 circuit. During the fault the CGPL single

phase to neutral voltage has reduced from 237 kV to 95 kV. It was further observed that

with the tripping of 400 kV CGPL-Bhachau 1 and 400 kV Bhachau-Ranchodpura D/C the

voltage has uplifted to 108 kV. However, with the clearance of fault from the system, the

CGPL voltage instead of recovering, declined gradually.


Figure 12: Voltage and current of R phase of 400 kV CGPL-Bhachau 2 which

tripped at the last.

This gradual decline in voltage without any appreciable change in the current was

observed from all the remaining five feeders emanating from CGPL.

Further, on analyzing the Active and reactive power Flow on the lines it was found that

during the fault generators have injected VAR to feed to fault. Figure 13 Shows the P/Q

plot on 400 kV CGPL-Bhachau 2 circuit observed from CGPL end. Prior to the fault

generators were in MVAR absorption mode as per the capability curve. With the Y phase

fault, Generators started injecting VAR to feed the fault which increased further with the

fault conversion the three phase fault which is anticipated in case of a generator feeding

the fault..

After the clearance of fault, Generators went to MVAR absorption mode with normal

active power flow. However, the Active power started reducing gradually on all the lines

with suppression of voltage as observed and it eventually became zero.

Trigger13-07-16

2:37:10 AM.226

t/s0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1

iL1/kA

0

1

2

3

t/s0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1

uL1/kV

0

50

100

150

200

Y phase fault on 400kV Bhachau-Varsana1 at Varsana Fault converted

to three phasefault

400 kV Bhachau-CGPL 1 trip in Zone2

Three phase fault cleared on400 kV Bhachau-Varsana 2

Voltage reduction started from 151 kVand reached to 8 kV within 290ms

As voltage started going up. Relay detected unstable powerswing for all 5 remaining lines from CGPL at CGPL end.


Figure 13: (A) No Fault in the system. All generators in absorbing VAR so Line MVARvalue is on -ve side (B) Y Phase Fault in the system. VAR went on Positive side due tofault feeding from CGPL generators. (C)Three Phase Fault in the system. VARcontribution from CGPL has further increased due the three phase fault. (D) Just priorto three Phase Fault clearance from the system. Generator in injection mode. (E) Afterthree Phase Fault clearance from the system. Generator in absorption mode. MVAR onthe line changed from +990 MVAR to -190 MVAR. (F) With decrease in voltage, Activepower flow on the line getting reduced. This is observed for all line emanating fromCGPL.

A B

C D

E F


The gradual decrease in the voltage of CGPL bus, after the fault clearance is indicative of

the fact that a power swing was set up. This gradual decrease in voltage of CGPL from

151 kV (after fault clearance) to 8 kV occurred within 290 ms., whereas the current on the

feeders has not changed significantly during this period of voltage decay as can be

observed in figure 14. The CGPL line Distance Protection Relays sensed the apparent

impedance entering in zone 3 followed by zone 2 and eventually zone 1. As soon the

impedance locus entered zone 1, the voltage started going up. All the five line relays

issued the trip command from CGPL end in zone 1 power swing. The power swing digital

status was not available in DRs from CGPL however, same is available in the event

logger of these lines at CGPL end and is placed at Annexure 4. Out of Step protection

also acted at CGPL and tripped units at about same time.

Figure 14: Impedance locus movement during the event at CGPL where it can be seen

how during voltage suppression the impedance has entered zone 1 causing tripping.

As it can be observed that Real power to the network through the five remaining lines

from the CGPL after the fault had started reducing. This resulted in the reduction in

electrical power on these lines causing difference in mechanical power to the generator

1. Apparent Impedance seenby relay when no fault insystem

2. Apparent Impedance of Y Phaseseen by relay in zone 2 when Yphase fault in the system.

3. Apparent Impedance of allthree Phases by the relay in zone2 when three phase fault in thesystem.

4. Apparent Impedance seenby relay when three phasefault got cleared.

5. Apparent Impedance seen by relay when voltage suppressionstarted. After this movement of impedance local all the threephase can be seen. The impedance locus has entered zone 1.

6. As voltage rise started to occur, it was detected asunstable power swing and again the impedanceentered zone 1. With this trip command issued.


and electrical power output from the generator, resulting into over speeding of units and

high frequency at CGPL. Due to this the unit went out of step /pole slipping.

Along with these five lines 220 kV Morbi-Bhachau circuit, also sensed the power swing

at Morbi end resulting in tripping of this line along with other lines.

Further during 400 kV CGPL-Bhachau and 400 kV Bhachau-Ranchropura D/C tripping,

power swing was sensed by 400 kV CGPL-Jetpur D/C line DPS.

Low voltage at CGPL has resulted in tripping of drives and auxiliary supply failure and

the SCADA and PMU data got interrupted due to communication equipment were being

supplied power from station supply, after isolation of rest of the system from CGPL.

One PMU is installed at CGPL sub-station with Bus Voltage and Line current of CGPL-

Jetpur 2 and Unit 40. During this event, the Communication supply of CGPL at CGPL

which was sending Data to WRLDC also got affected resulting in lack of PMU data. The

data is available till 02:37:11.560 ms.

Figure 15 shows the PMU frequency plot which shows that event after the fault clearance

the frequency of CGPL bus has reached 50.24 Hz. Increase in frequency at CGPL

indicate the over speeding of generators due to load thrown-off..

Figure 16 Shows the Angular Separation of Various nodes along with CGPL w.r.t

Vindhyachal Bus.

Figure15: Frequency of CGPL with the rest of the grid.


Figure 16: Angular Separation of Various nodes along with CGPL w.r.t Vindhyachal Bus.

5.4. Post event Scenario at 02:40 Hrs

After the blackout of CGPL and tripping of Lines from Bhachau, the Gujarat system became

power deficient and power flow increased on the inter-state lines from Madhya Pradesh,

Maharashtra and on Inter-Regional AC lines from Rajasthan towards Gujarat. This can be

observed in Figure 17 which provides the scenario of the Gujarat system after the event.

Figure 17: Gujarat system at 02:40 Hrs i.e. after the blackout of CGPL. CGPL end data

got stuck due to issue at CGPL end. Import on Inter-State lines of Gujarat and Inter-

Regional lines from Rajasthan has increased.Report of Black out at CGPL on 13.07.2016









Regional lines from Rajasthan has increased.Report of Black out at CGPL on 13.07.2016









Regional lines from Rajasthan has increased.



Immediately after the event, the restoration activities were started by WRLDC control room

in coordination with CGPL/Gujarat SLDC and PGCIL. Start-up supply was extended to

CGPL from 400 kV CGPL-Chorania circuit at 03:40 Hrs. After this one by one other

transmission elements were taken in service as provided in table 1 which have tripped during

event 1, event 2 and event 3. Generators were also restored subsequently as provided in table

2.

Table 1 : Transmission Elements Restoration

Element Date of

Restoration

Time of Restoration

400 kV Varsana-Hadala* 12-07-16 21:41 (It again tripped

on bus 2 fault at 21:50

Hrs)

400 kV Bhachau-Ranchodpura 2 13-07-16 03:11

220 kV Bhachau-Morbi 13-07-16 03:24

400 kV CGPL-Chorania 13-07-16 03:40

400 kV CGPL Bus 1 13-07-16 03:40

400 kV CGPL Bus 1 13-07-16 03:40

400 kV CGPL-Bhachau 2 13-07-16 04:47

400 kV Varsana-Hadala* 13-07-16 09:10

400 kV Varsana Bus 2 13-07-16 09:10

400/220 kV 315 MVA Varsana

ICT 213-07-16 11:26

125 MVAR Varsana Bus Reactor

213-07-16 11:39

400 kV APL-Varsana 1 13-07-16 11:51

400 kV APL-Varsana 2 13-07-16 11:57

400 kV Varsana-Kansari 13-07-16 18:35

400 kV Varsana Bus 1 13-07-16 18:35

50 MVAR Varsana Bus Reactor 1 13-07-16 18:46


ICT 113-07-16 18:57


400 kV CGPL-Jetpur 1 13-07-16 19:50


ICT 313-07-16 22:26

400 kV Varsana-Bhachau 2 14-07-16 16:26

400 kV CGPL-Bhachau 1 14-07-16 08:58

400 kV CGPL-Mansar 14-07-16 09:36

400 kV Bhachau-Ranchodpura 1 14-07-16 08:39

400 kV CGPL-Jetpur 2 14-07-16 10:20

400 kV Varsana-Bhachau 1 15-07-16 13:25

400 kV Bhachau-Essar Vadinar 1

(Idle changed from Bhachau)16-07-16 07:48

400 kV Bhachau-Essar Vadinar 2

(Idle changed from Bhachau)16-07-16 07:48

Table 2 : Generation Restoration

Unit Name Date of

Restoration

Time of Restoration

CGPL Unit

40

13-07-16 18:36

CGPL Unit

40

14-07-16 00:45

OPGS Unit 1 15-07-16 02:39

CGPL Unit

30

16-07-16 19:07

CGPL Unit

10

21-07-16 19:10


6. Performance of defence mechanisms

1. Frequency Response Characteristic

Frequency Response Characteristics of WR and its constituents during CGPL Blackout is

enclosed at Annexure-5

2. ROCOF (df/dt) Based load Shedding

The quantum of df/dt based load shedding is enclosed at Annexure-6

3. SPS Scheme at CGPL

The SPS in service at CGPL is enclosed at Annexure-7

7. Conclusions & Recommendations:

1. RTV Silicone Coating of Insulators:

The bus fault at Varsana has occurred due to the insulator tracking and

flashover during foggy weather conditions with rains. PGCIL informed that flashover

event could be minimised if the hot-line washing and RTV silicone coating of

insulators be completed prior to the rainy season. Therefore sub-station falling under

pollution zone/saline zone should explore adopting best practices of hot line washing

prior to rainy season along with the application of RTV silicone coating to avoid such

events in future. Varsana is an important GETCO station connected to two large

generation complexes. GETCO may look into the possibility of RTV Silicone coating

in such areas.

2. Charging of Dead Bus:

Dead Bus should generally be charged through a long line or through ICTs, so

that the fault currents are less. A Dead Bus after bus fault should not preferably be

charged through short line and lines having generator connected at remote ends of

lines. Also dead bus should not be charged through line having strong source at the

other end.

Action: All utilities to please note for future.


3. Power Swing phenomenon

Prior to the event, the CGPL generation was around 2875 MW. During the event

CGPL Units had fed the three phase fault at Varsana for a duration of 350 ms. Along

with this event, three 400 kV lines also got tripped which was followed by a

continuous decline of voltage for 290 ms. The voltage started rising, this was detected

as a power swing entering in zone-1 by the line DPS at CGPL end and the lines

tripped.

The reasons for excitation of the oscillations need to be found out since these

oscillations were not damped out resulting in a severe power swing. A transient study

by modelling the proper network is required to done.

PCM may decide the modalities of carrying out these studies. The scope of these

studies shall be to examine the cause of power swing, various factors that contributed

to CGPL machines going Out of Step and suggest remedial measures.

4. Protection Coordination Issue in Zone 2

The Zone 2 settings adopted by CGPL for all the lines, at CGPL end is

300msec and the remote end settings are 350msec. The adoption of 300msec for Zone

2 at CGPL end is in view of stability of generating units and critical clearing time of

faults. It was noted that the 400kV Bacchau-Versana-1 & 2 lines are very short lines

(8.5kM). Therefore group recommended interimly that PGCIL may adopt 250msec

for 400kV Bacchau-Versana-1 & 2 and CGPL may adopt 350msec for time being,

and afterwards based on the studies for critical clearing time/stability of the generators

for faults to be carried out, it would be decided to raise the zone 2 time settings for

these lines. PGCIL/GETCO/CGPL in mutual coordination may set the relay settings

as above. PCM may vet these interim settings.

5. Permissive Trip Carrier being received as direct trip for 400 kV Bhachau-CGPL

1 at Bhachau end.

It was observed that the permissive carrier sent by CGPL for the 400 kV

CGPL-Bhachau 1 was received as direct trip by the Bhachau end. In view of this, end

to end testing of the Carrier signal has to be checked by the both utilities (CGPL and

PGCIL) in coordination with each other.


6. Bus configuration at 400 kV Varsana.

The elements should be distributed evenly on the buses (Bus A & Bus B) such

that these elements can be served optimally in the event of Bus faults to enhance the

reliability. The elements on Bus-1 & Bus-2 were not evenly loaded at 400kV Varsana

S/S. Therefore it is recommended that GETCO may explore how Bus configuration

can be changed such that, balanced loading on buses is achieved on both the 400 kV

buses at Varsana S/S.

7. SPS at CGPL :

As none of the criteria for CGPL operation was satisfied due to low generation

at CGPL, the SPS has not operated as per the design.

8. Loss of PMU data from CGPL:

After tripping of units & auxiliaries the PMU data was not available. It should

be ensured that the data from PMU should always be available.

Further in the report on similar blackout at CGPL in 2014 it was

recommended that the PMU installed on unit 40 does not serve any purpose in

analysing such events and therefore it was suggested that the same should be shifted

on 400KV CGPL- Bhachau line.

It is again recommended that the above should be done immediately.

*********************************************************************

1 2 3 4 5 6 7 8 9 10 11

Yes/No

WhetherattendedYes/No

If notattended,

reason

Yes/No


If no, expecteddate to attend

1) Zone 1 seeting of 400kV & 220kV lnes areset to 90% instead of 80% which needs to berevised to 80%.

Yes Yes … … … … ……

Directional E/F setting to be adopted inBhusawal & Nandgaon Peth Bay.

… … … Yes No …

STUB Protection to be enabled in NandgaonPeth & Bhusawal Relay.

… … … Yes No …

Zone-4 setting was 1000 ms. Yes Yes … … … … Zone-4 setting adopted400 ms according ESGgroup.

Harmonic restrain feature not adopted inboth H.V. & L.V. Back-Up Relay

… … … Yes No … Services of SiemensEngineer required.Requirement sent to TheExe.Engg 400KV RSDivision, Akola.

Only internal OPEN delta used in NDVRRelay for tripping. External Open delta foralarm is not available.

Yes Yes … … … …

Importang digital signals are not included inDR of Nandgaon peth, Bhusawal & ICT bay.

… … … Yes No … Required changes insetting file of relay iscarried out offline.However for configurationoutage , services ofsiemens engineer isrequired.Requirementalready sent to TheExe.Engg 400KV RSDivision, Akola.

Wide variation in LBB current detectorsetting.

… … … … … … Matter is taken up withM/S PGCIL.

400 KV

Required changes insetting file of relay iscarried out offline.However for configuration

Name of Zone: Amravati

Present Status of Protection Audit Deficiencies (A & B type) in MSETCL for the year 2014-15 as on 31/07/2016

Sr.No.

Name of S/sidentified for

Protection Audit

S/svoltage

(kV)Observations of protection Audit

Deficiencies that can becorrected without

procurement (Category-A)

Deficiencies involvingprocurement (Category-B)

Present Status as on31/07/2016

Akola1

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No





Sr.No.


Protection Audit

S/svoltage






2 Paras 220 KV The s/stn is audited in previous 2 years andthe descripancies are attended andcomplied. No descripancy observed duringthe PA - 2014-15

… … … … … … The s/stn is audited inprevious 2 years and thedescripancies are attendedand complied. Nodescripancy observedduring the PA - 2014-15

3 Akola 220 KV The setting of LBB relays was 0.2 Amp forEHV Lines

Yes Yes … … … … The setting revised andkept 0.8 amp as per ESGrecommendation.

1. Carrier protection & AR scheme for 220KV feeders not commissioned

No -- -- Yes Yes -- SEL 321 relays replacedunder retrofitting schemeand AR Scheme commd.

2. Load trimming scheme for ICTs is needed. Yes Yes -- No -- -- Load trimming schemecommissioned.

1. Zone 3 setting of all 220 KV & 132 KVlines was 100% of protected + 100% oflongest line at remote s/stn

Yes Yes … … … … Settings corrected as perESG recommendation as :120% (Protected line +Longest line at RemoteS/stn)

2. Zone -2 time setting of 220 kV Ambazari& 132 kV Ambazari lines needs to be revisedas these lines are followed by short line atremote S/stn.

Yes Yes … … … … Existing 350 msec settingsevised to 450 msec.

1. Zone 3 setting of all 220 KV was 100% ofprotected + 100% of longest line at remotes/stn

Yes Yes … … … … Settings corrected as perESG recommendation as :120% (Protected line +Longest line at RemoteS/stn)

2. LBB setting of T/F 1&2 was 80% of CTRconnected instead of 80% of T/F operatingcurrent

Yes Yes … … … … The settings corrected.

Badnera 220 KV6

220 KVChikhali4

220 KVAmravati5

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No





Sr.No.


Protection Audit

S/svoltage






7 Malkapur 132KV … … … … … … …

8 Dhamangaon 220 KV 1. Zone 3 setting of all 220 KV was 100% ofprotected + 100% of longest line at remotes/stn

Yes Yes … … … … Settings corrected as perESG recommendation as :120% (100% Protected line+ 100% Longest line atRemote S/stn)

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,re

ason

Yes/No


If no,expecteddate to attend

1. Zone-4 (reverse zone)timing setting ofDisatce relay is 900 mSec

Yes Yes -- -- -- completed Zone -4 (reverse Zone) timesetting revised to 350 msec

2.DG set not available -- -- -- Yes No On receipt ofmaterial

3.Only one DC source available -- -- -- Yes No On receipt ofmaterial

1.Zone-4 (reverse)timing setting of Disatancerelay is 900 mSec.

Yes Yes -- -- completed Zone -4 (reverse Zone) timesetting revised to 350 msecas per Protection auditguidelines.

2.DG set not available -- -- -- Yes No On receipt ofmaterial

3.Only one DC source available -- -- -- Yes No On receipt ofmaterial

4. 220KV & 132KV Bus section isolationcircuit Breaker not available. The saidbreaker are proposed in the 220 kV & 132kV Main Buses.

-- -- -- Yes No On Availabilityof Breaker

1.For 400kV Solapur line zone 4 & brokenconductor detection functions are OFF in M-1 & M-2. A/R function is OFF in M-2

NO NO Yes NAWork inProgress

ABB representative isawaited. communicationsoftware is not available

For 220kV Murud line zone 3 setting is morethan calculated setting

Yes Yes NA NA NA completedThe same is rectified andadopted as per calculation

For PGCIL ckt- 1 & 2 Zone 4 time setting issame as zone 3 time and Broken conductorfunction is OFF in main-2 relay of both lines.

Yes Yes NA NA NA NA

1)Zone 4 time changedfrom 1 sec to 1.1 sec 2)Broken conductor functionis enabled in main-2 relayof both lines.


Name of Zone: Aurangabad

Sr.No.

Name Of S/sIdentified for

protection Audit S/svoltage

(kV)

Observations of Protection Audit Deficiencies that can becorrected without

procurement(Category-A)

Deficiencies involvingprocurement(Category-B)

Present status as on30/07/2016

1 220KVPADEGAON

220 KV

2 220KV JALNA 220 KV

3 400kV Girwali400/

220kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,re

ason

Yes/No





Sr.No.



(kV)





BRC feature disabled. YES YES NA NO NA completed

SOTF feature is selected for all zones YES YES NA NO NA completed

PSB blocking zones selected for all zones YES YES NA NO NA completed

A/R feature is disabled NO NO YES NOon receipt ofbinary IO cards

single ph LBB initiation isnot available

Timing of Zone II for 220 KV Harangul I & II& nanded is 350 mSec.

YES YES NA NO NA completed

Some contacts of PT selection relay are notoperating.

NO NO NA YES NOAfter receipt ofrelays

Requirement submitted

Existing PT selection scheme is as per old PT.In old PT only 1 core is used for ProtectionAs well as metering purpose.

NO NO NA YES NOAfter receipt ofPT


5220 KV New TPSParli

220 KV SOTF feature is selected for all zones YES YES NA NO NA completed

1. Protected Line Lengths. YES YES NA NO NA completed

2. Brocken conductor function disabled. YES YES NA NO NA completed

3. SOTF selected for all zones. YES YES NA NO NA completed4. PSB blocking zones selected asZ1,Z2,Z3,Z4.


5. 132KV bus-bar protection fail alarm &block settings were different.


8. DC supervision scheme is not available onany panel.

NO NO NA YES NOOn PanelReplacement


9. Separate DC circuits for Main prot., B/Uprot., isolator circuits, trip ckt-1 & 2,annunciation & indication ckts, etc are notavailable in any panel.

NO NO NA YES NOOn PanelReplacement


11. The present annunciators on 132KVRenapur, 132KV Latur Line and 132/33KV TF-4 panels are faulty.

NO NO NA YES NOWork inProgress


4220 KV OLD GCR

Parli220 KV

6 220 KV GIRWALI220/132/3

3 KV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,re

ason

Yes/No





Sr.No.



(kV)





2) 132KV Jangamwadi-II Bay: Announciatorfaulty.

NO NA NA YES NOWork inProgress

Requirement

14) 220KV PT:- i) Single core has beenutilized for protection & metering as per oldscheme ii) Open delta voltage derived fromauxiliary PT

YES NA

After cablelaying & onavailabilityof outage

duringretroffiting

NO NA NA Outage awaited

16) 132KV Umri-1, 132KV Umri-II, 132KVNarsi, 132/11KV 25MVA Emco TF, 132/11KV25MVA BB TF, 50MVA 132/33KV Vijay TF,50MVA 132/33KV BBL TF: 132/33KVTripcircuit Supervision Relay

NO NA NA YES NOOn RelayReceipt


17) 132KV Umri-1, 132KV Umri-II, 132KVNarsi, 132/11KV 25MVA Emco TF, 132/11KV25MVA BB TF, 50MVA 132/33KV Vijay TF,50MVA 132/33KV BBL, 132KV Jangamwadi-1, 200MVA 220/132KV BBL ICT-1, 200MVA220/132KV BBL ICT-II, 220KV TBC TF:- C.BSupervision relays

NO NA NA YES NOOn RelayReceipt


20) cable from TF LV bay CT M.B to Panel formetering is of 4 core Aluminium cable.Hence eeds to be replaced by 4 core Coppercables.

NO NA NA Yes NO work in Progress Requirement submitted

7 220KV Waghala 220KV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,re

ason

Yes/No





Sr.No.



(kV)





7. NT switches for 132KV Jintoor & Parbhanibays are not working

NO NA NA YES NO Attended completed

8. Cables utilized in CT circuitery for 132 &220KV from CT M.B to Panels are Aluminiumtype. Needs to b replaced by copper

NO NA NA YES NO work in Progress Requirement submitted

9. Bus sectionaliers for 132 & 220KV notavailable.

NO NA NA YES NO work in Progress Requirement submitted

10. 05 nos of Battery cells detected -Ve.Replacement required

NO NA NA YES NOAfter

Procurement.Requirement submitted

13. 07 nos of D.C supervision relays foundfaulty

NO NA NA YES NOAfter

Procurement.Requirement is to besubmitted

220 KV Parbhani 220KV8

Yes/No


If notattended,

reason

Yes/No



DGA testing of ICT YES Yes - - -DGA tender is in processby O & M circle office

GPS synchonisation of Relays YES No

Issue to betaken withmanufactu

rer

- - -

Zone 1 seeting of 400kV &220kV lnes are set to 90%instead of 80% whichneeds to be revised to80%.

400KV Karad-Lonikand Line Autorecloser notin service.

YES Yes - - -Work is done. AR taken inService in July -15

Nitrojen injectoin system for ICT -I is onManual mode due to only one relay panel(CTR Make)

- - - Yes No

within 10 daysafter receipt of

relays, subject tooutage

Requirement of 400/220KV, 315MVA ICT-I relay panelalready submitted to C.OMumbai

GPS synchonisation of Relays - - - YES No -GPS synchonisation isdone for Main-I & Main-II

DG set shall be made available foremergencies

- - - YES No -Requirment is submitted toC.O.

3 220 kV Vita 220 - - - - - -OTI meter found faulty for EMCO make,220/132 kV, 100 MVA T/F

- - - Yes No Needs Procurement

R Phase element of TMD unit is faulty for220 kV Busbar Protection relay

- - - Yes No

5 220 kV Peth 220 Nil - - - - - - -

6 220 kV Ogalewadi 220 Nil - - - - - - -

Distance relay of 110 kV Vishrambag 1 line isfound removed due to its faulty power card

- - - Yes No -Relay is repaired &retrofitted on 02.02.2015

New 110 kV Busbar protection scheme isrequired in view of replacement of old faultyscheme.

- - - Yes No - Order is placed by C.O.


1

2

4

7 220 kV Miraj 220


Name of Zone : Karad

Sr.No.


Protection Audit

S/svoltage





400kV Karad 400 kV

400 KV New Koyna 400 KV

220 kV SataraMIDC

220

Yes/No


If notattended,

reason

Yes/No






Sr.No.


Protection Audit

S/svoltage





WTI & OTI of 220/33 KV T/F No.1 & 2 arefaulty.

- - - Yes No - Needs Procurement

Relays for generation feeders should be ofDirectional feature i.e. for 33 KV vankusavde1,2,3,4, 33 KV RS India 1,2 feeders foravoiding unwanted trippings along withoutgoing feeders at Malharpeth S/stn

- - - Yes No -

R and Y phase 220 KV PTs are of 2 cores(mixed metering and protection core) . Itshould be of 3 cores for correct protectionoperation and proper energy accounting.

- - - Yes No -

33 KV PT not available for 220/33 KV, T/FNo.2; and it is required for proper energyaccounting and UFR & Feeders (directionalrelay ) tripping.

- - - Yes No -

UFR should be having PT selection for 33 KVPT 1&2

- - - Yes No -

9 220 kV Lonand 220

22 kV Bus PT is having Single Cores whichshould have of 3 cores so as to separate outprotection and metering classes forcorrosponding applications.

- - - - - - -

10 220 kV Jath 220 Nil - - - - - - -

11132 kV Satara

Road132 Nil - - - - - - -

8 220 kV Malharpeth 220

Yes/No


If notattended,

reason

Yes/No






Sr.No.


Protection Audit

S/svoltage





MOG of 110/11 KV,EMCO T/F not working - - Yes No - Needs Procurement

No trip relays are available to O/C-E/F relays'of following feeders- 33KV Shirgaon LIS,33KV Shahu LIS, 11 KV Kay pulp

- - Yes No -

O/C-E/F relays of generation feeders shouldbe having directional feature i.e. for 33 KVVankusavade 1,33 KV Vankusavade 2 feeders

- - Yes No -

UFR should be having PT selection for 33 KVPTs and 11 KV PT

- - Yes No -

13 110 kV Ashta 110 Nil - - - - - - -

14 Mudshingi 220 KV

110 kV PT is having 2-cores which shouldhave of 3-cores so as to separate outProtection and metering classes forcorresponding applications

- - - Yes No needs Procurement

15110 kV Gokul

Shirgaon110 KV Nil

Directional Relay should be provided forTransformer-I & Transformer-II.

Yes NoNR Scope make Panels arereceived & replacementwork is in process

REF relays for 50 MVA Transformer-I & IIshould be replaced. Existing relays are notsuitable for REF Protection.

Yes No

220 kV PT should be of 3 Cores. Presentlythere is of 2 Cores PT.

Yes No needs Procurement

17 kale 110 KV nil

18 Halakarni 220 KV nil

19 Pawas 220 KV Busbar protection relay required Yes NoOrder given to M/S NR forbusbar relay

12

16 220 kV Mumewadi 220/33 KV

110 kV Atit 110

Yes/No


If notattended,

reason

Yes/No






Sr.No.


Protection Audit

S/svoltage





1) For 110 /33 KV Voltamp make TF Fan no-3 not working.

YesNot working fan wasreplaced on dated24.01.2015

2) Fan switch for 110/33 KV Voltamp makeTf needs to be in auto mode.

Fan switch kept on automode

3) B/U relay time setting of 110 KVRadhanagari fedder needs to be modified ifrequired.

Settings are revised as perfault level

21 Bapat Camp 110 KV nil

22 Wathar 220 KV220 KV Bus bar protection is out of servicesince 16 Mar 2014 due to relay's displayproblem.

Yes NoAfter repaired, tested andtaken into service

23 Kanakavali 132 KV nil

24 Kharepatan 220 KV Busbar relay found faulty Yes NoAwaited for M/S ABBrepresentative for repairthe same

25 Lote 220 KV nil

20 Kotholi 110KV Yes

Yes/No


If notattended,

reason

Yes/No




Yes Yes Attended

2)Earth leakage to be attended Yes Yes Attended

3) For 400KV Bhusawal & Koradi-II ckt, REL521 ABB make distance schemes (Main-I &Main-II) are provided. In REL 521 (ABB make)distance scheme, Zone-4 i.e. Back-up to busbar feature is not available.

Yes No Pending

2400KV

Khaperkheda S/Stn400KV

1)220V Set :- Cell no. 5 specific gravity to beconfirmed

Yes YesSpecific Gravity of Cell no.5 is 1220

3400KV Koradi-II

S/Stn400KV 1) Earth leakage to be attended Yes No

Notattendedby Project

agency

Pending

1)Earth leakage to be attended Yes Yes Attended 2)Battery 220V Set 1 Cell no.36 is in poorcondition & need to be replaced.

Yes Yes Attended

5400KV Chandrapur-

II S/Stn400KV

1)Charger Earth leakage problem in boostmode to be attended

Yes No

To attend the problemsome costly spares are

required and as it is stillunder guarentee periodhence matter is taken

upwith M/s.BHEL1)DC mixing problems to be attended Yes Yes Attended

2)Earth leakage (2-3 mA) to be attended Yes Yes Attended

3)MB Cable pulling problem to be attended Yes NoMatter taken up with M/sL&T dt.26.08.2015



4400KV GCR

Chandrapur S/Stn400KV


Name of Zone : Nagpur

Sr.No.


Protection Audit

S/svoltage




6400 KV Warora

S/Stn400KV

1400KV Koradi

S/Stn400KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)Earth leakage to be attended Yes YesEarth leakage attendedand presently earthleakage is NIL

2)132/11KV, 25MVA T/F: Oil leakage fromdrain valve to be attended.

Yes Yes Attended

3)Vermin proofing needs to be improved. Yes Yes Attended

4) Metal spreading is inadequate. Yes Yes Attended

5)Grass cutting is required. Yes Yes Attended

6)220KV & 132KV Isolator structure problem Yes NoPertaining to civil Dncorrespondace done withcivil Dn.

7)ICT-3 (Bharat Bijlee):- Online H2 & H2Omeasurement (model calisto make MORGONSCHFFER Canada) not working

Yes No Offer not received fromagency

8)220V 500AH Exide battery set havingEfficiency 60% Needs to be replaced/reconditioned

Yes No Requirement submitted

9)48V 200AH exide battery set efficiency70% Needs to be replaced/ reconditioned

Yes Yes Replaced can 12.03.2015

10)25 MVA, 132KV/11KV T/F-I Bph Ir is 227micro Amp. It=1219.7 micro amp. IR valuesof LA stack needs to be confirmed.

Yes Yes Ir-37 It-618 on dt. 13.01.2016

11)Hingna-I 132KV Bph Ir = 239 microA It =410 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-35 It-585 on dt. 13.01.2016

7220KV Ambazari

S/Stn220KV

7220KV Ambazari

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




12)220KV Koradi-II 220KV RphIr = 277 microA It = 252 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-25 It-570 on dt. 13.01.2016

13)Koradi-I 220KV RphIr = 175 microA It = 271 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-33 It-589 on dt. 13.01.2016

14) 200MVA, 220/132KV-ICT-III 132KV YphIr = 232 microA It = 1228 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-31 It-760 on dt. 13.01.2016

15) 200MVA, 220/132KV-ICT-II220KV BphIr = 238 microA It = 771 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-81 It-430 on dt. 13.01.2016

16)200MVA, 220/132KV-ICT-III132KV BphIr = 297 microA It = 1986 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-71 It-600 on dt. 13.01.2016

17)200MVA, 220/132KV-ICT-II132KV YphIr = 222 microA It = 1765 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-41 It-561 on dt. 13.01.2016

220KV220KV Ambazari

S/Stn7

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




18) 150MVA, 220/132KV ICT-I132KV Y-PHIr = 247 microA It = 3642 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-32 It-760 on dt. 13.01.2016

19) 25MVA, 132/11KV T/F-I132KV Y-PHIr = 208 microA It = 1144 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-24 It-571 on dt. 13.01.2016

20)25MVA, 132/11KV T/F-I132KV B-PHIr = 267 microA It = 759 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-37 It-618 on dt. 13.01.2016

21) 132KV Amrawati132KV Y-PHIr = 201 microA It = 2153 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-31 It-536 on dt. 13.01.2016

22) 132KV Hingna-I132KV B-PHIr = 374 microA It = 589 microALA needs to be replaced.

Yes Yes Ir-35 It-585 on dt. 13.01.2016

23)CTs having higher Tan delta values needsto be replaced

Yes YesPD carried out and CTsfound ok

24) In 7SA511 Zone-4 is not in operation Yes No Pending

220KV AmbazariS/Stn

220KV7

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)220KV K' Wada-II ckt: 3nos IVT's to bereplaced by CVT's


2)48V battery bank: 15th number cell isbypassed needs restoration

Yes Yes Cell Commissioned

3) K'Wada-I -2 nos,Suryalaxmi-1 no,Butibori-III - 1 No4 Nos oil leaked CVT's to be attended

Yes Yes Attended

4)Cable trench broken slippers to bereplaced.

Yes NoPertaining to civil Dn Dn.correspondace done

5) Earth leakage to be attended. Yes Yes Attended6) Grass cutting & metal spreading in yard isrequired.

Yes Yes Attended


1)Bus coupler: Y-Ph & R-ph CT oil leakageto be attended.

Yes Yes Attended

2)100MVA, 220/132KV ICT, T/F-3 & T/F-1:-Oil leakage to be attended.

Yes Yes Attended

3)Grass cutting in yard is required. Yes Yes Attended

4) Vermin proofing needs to be improved. Yes Yes Attended

5) 50MVA 220/33KV T/F-I EMCO 220KV R-PHIr = 153 microA It = 823 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-29 It-715 on dt. 28.01.2016

6)50MVA 220/33KV T/F-I EMCO 220KV B-PHIr = 223 microA It = 813 microAIR values of LA stack needs to be confirmed.

Yes Yes Ir-77 It-655 on dt. 28.01.2016

7)132KV Khapri-II 132KV B-PH Ir = 184microA It =408 microA IR values of LA stackneeds to be confirmed.

Yes Yes Ir-32 It-486 on dt. 28.01.2016

8220KV

Khaperkheda S/Stn220KV

9220 KV Butibori

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)Earth leakage to be attended. Yes Yes Attended2) 48V Battery set: Battery Bank efficiency :-50%Needs replacement/ recondition

Yes YesReplaced on Feb 15(27.02.2015 ) Battery 100%

3) Hingna –II feeder ABT meter problemneeds to attend

Yes Yes Meter replaced

4) 132/11KV, 25 MVA T/F-I132/11KV, 16 MVA T/F-II132/11KV, 50 MVA T/F-IICooling fans not working in auto mode.

Yes Yes Attended

5)For 220KV Amabazari & 220KV Pandhurnafeeder, PLCC coupling is Ph-E. Needs to beconverted to Ph-Ph to reduce the chances ofA/R failure during Ph-E fault.

Yes No CCs recivied WTs required.


7)Metal spreading is inadequate. Yes NoPertaining to civil Dn Dn.correspondace done

8) 220KV Ispat, R-Ph -118, Y-Ph – 199, B-ph -143 Repeat the CRM

Yes YesValues within permissiblrlimit R-ph - 38 Y ph - 22 Bph - 28

1)220V Battery bank :75 no. Cell is bypassed Yes Yes Attended

2)220V Battery bank:- Efficiency 65%. Batterybank needs to be replaced.

Yes Yes Attended

3)220V Battery bank:- Cell no.7,9,20,21,66,95,96 specific gravity to beconfirmed.

Yes Yes Attended

4) Oil leakage in Y ph bus PT-I needs to beattended

Yes Yes Attended

5)Oil leakage in 200 MVAICT R& Y ph HV &neutral bushing to be attended.

Yes No Pending

11220KV Bhandara

S/Stn220KV

10220KV Kalmeshwar

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




6) Vermin proofing needs to be improved Yes Yes Attended

7)Diagnostic testing progress needs to beaccelerated.

Yes Yes Attended

8)Earth resistance value to be confirmed. Yes No Pending

9) After transferring Kanhan-I feeder on TBC,it is observed that, distance protection nottransferring on TBC. Same to be confirmed/rectified with Testing Engineers

Yes Yes Attended

10)Following feeders are not closingremotely1) 132KV madgi-I & II2) 16MVA T/F HV side3) 132KV Ambhora-I4) 132KV Kardha5) 100MVA ICT HV/LV

Yes No Pending

11) 132KV Ambhora-II & 132KV Kanhanfeeder CB spring charging problem

Yes Yes Attended

1)220V Battery bank: Cell no. 26 specificgravity to be confirmed

Yes Yes Sp. Gravity is ok

2) 220V Battery bank :72 no. Cell is bypassed Yes No Requirement is forwarded

3) 220V Battery Bank efficiency :- 60%48V Battery Bank efficiency :- 70%Needs replacement/ recondition

Yes No Requirement is forwarded

4) Earth resistance value to be confirmed. Yes YesEarth Resistance valuesconfirmed and satisfactory

5) CTR is bypassed for 200MVA ICT Yes Yes CTR taken in Service 6)33KV Tiroda breaker remote closingproblem

Yes Yes Problem resolved

12220KV Kaulewada

S/Stn220KV

220KV220KV Bhandara

S/Stn11

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




7) Oil leakage of following equipments to beattended1)200MVA ICT-I & 100MVA ICT-I2)220/33KV 25MVA TF-1 & 2

Yes

Yes(Except

220/33KV25MVA TF-

1 & 2)

Requirement is forwarded

8)132KV Kachewani-I132KV Y-PHIr = 160 µA It = 1394 µAIR values of LA stack needs to be confirmed

Yes Yes Trend is under Monitoring

9) CC’s are bypassed for following feeders:-1) 132KV Madgi-1 B Ph2) 132KV Gondia-13) 132KV Gondia-2 B Ph4) 220KV Khaperkheda-2

Yes No Requirement is forwarded

1)220V DC Earth leakage problem to beattended

Yes NoWill be

attendedsoon

The work is to be carriedout by testing/by externalagency

2) Earth leakage ammeter on charger to beprovided

Yes No At an earliest Pending

3)110V DC earth leakage problem to beattended

Yes NoWill be

attendedsoon

Pending

4) 110V Charger Annunciator is not inworking condition

Yes No At an earliest Pending

5)Cracks found in REC structure of isolator Yes No At an earliest Pending

6)Oil leakage of following equipments to beattended1)66/11KV 10MVA TF2)220/66KV 50MVA TF-23)66/11KV 10MVA TF 3

Yes1) No 2)

Yes 3) No

1) Work till notattended 2)

Work attendedby agency 3)Work till not

attended

Pending

13220KV Wardha

S/Stn220KV

12220KV Kaulewada

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




7)Vermin proofing needs to be improved YesYES (Partiallycompleted)


8)Diagnostic testing progress needs to beaccelerated.

Yes Yes Attended

9) Earth resistance value to be confirmed. Yes Yes Attended

10)Metal spreading required Yes No Requirement submitted 11)HEL make CB of TF is not remotelyclosing.


1)Last C/D cycle carried out in Yr. 2012 Yes No Pending 2)Oil leakage of following equipment to beattended1)25MVA, 132/33KV TF-1 & 22) 80MVA 220/132KV ICT3)33KV Bus PT

Yes Yes Attended

3)Earth resistance value to be confirmed. Yes Yes Attended

4)Vermin proofing needs to be improved Yes Yes Attended

5) Metal spreading required Yes Yes Attended

6)Grass cutting is required. Yes Yes Attended

7)CRM not carried out in 2014-15 Yes Yes Attended

8)DGA not carried out in 2014-15 Yes Yes Attended9)ABT meter not present for followingequipments / feeder:1)220/132KV 100MVA ICT-2 HV/LV2)132/33KV 25MVA TF-1 LV3)80MVA 220/132KV ICT-I LV

Yes NoABT meters arenot available

Pending

10)220/132KV 80MVA ICT-1 (HV breaker)TC1:- RPh- 108, Y Ph:- 111, B Ph:- 109TC2:- RPh- 108, Y Ph:- 110, B Ph:- 108Repeat the timing

Yes Yes Attended

13 220KV220KV Wardha

S/Stn

14220KV Hinganghat

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)220V Battery bank:- Cell no. 4,43,45,48,68cell voltage to be confirmed

Yes YesBattery cell replaced ondtd 11.01.2016

2)Grass cutting is required. Yes Yes Attended 3)Lloyd CB PDR relay problem needs to beattended.

Yes Yesproblem attended on dtd.10.12.2015

4)Oil leakage of following equipment to beattended1)Lloyd feeder Y ph Metering PT2)TBC Y ph CT3)220/33KV 25MVA TF 1 & 24) 220/132KV 100MVA ICT5) 220/132KV 100MVA ICT LV Y Ph CT6)132KV Deoli R,Y,B ph CT7)132KV Seloo R ph CT8)33KV Sewagram Y ph CT9) 33KV Bus Y ph PT

Yes

Yes(except132KV

Deoli Y phCT &

33KV BusY ph PT

minor leakagefrom connectionbox.hence\ need

replacement



6) Diagnostic testing progress needs to beaccelerated.

Yes Yes Attended

7)Earth resistance value to be confirmed. Yes Yes Attended

8)Metal spreading required Yes No Requirement submitted 9)220/132KV 100MVA ICTAERC3 :- 3 nos. Multiplier relay faulty needsto be replaced.


15220KV Bhugaon

S/tn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)220V Set :- Cellno.1,3,5,14,16,35,36,60,61,74, 104 specificgravity to be confirmed

Yes Yes Values are within limit

2)Last C/D Cycle carried out on 12.04.2012 Yes YesCD cycle carried out on dt.14/04/2015.

3)48V Set :- Cell no.1, 16 specific gravity tobe confirmed

Yes Yes Values are within limit

4)Earth leakage ammeter on charger isfaulty

Yes NoAdministrative approvalproposal for batery chargerrepairs is submitted

5)Post Monsoon LCM not carried out. Yes YesCarried out ondt.23/02/2015

6)Earth resistance value to be confirmed. Yes YesConfirmed values arewithin limit

7)Grass cutting is required. Yes YesDone by agency ondt.10.12.2015

8)Earth leakage to be attended. Yes YesAttended but (-) ve leakageis present.

9)Oil leakage of following equipments to beattended : 1)220/33 KV 25 MVA TF 1 & 2,2)220/132 KV 50 MVA ICT 1, 3) 220/132 KV100 MVA ICT 2, 4) R ph & B Ph CT of220/132 KV 100 MVA ICT 2, 5) 220KV Virur YPh CT, 6) 220KV R Ph CT & 33KV R Ph CT of220/33 KV 25 MVA TF 2

Yes Yes Oil leakage attended

10)TBC Breaker Compressor problem Yes Yes Problem attended

11)100MVA ICT-2Cooling fans not working in auto mode.

Yes YesE-tender for repairs of T/Fcooling fan is underprocess.

12)ABT Meter not present for 33KV Kotgal-MIDC & 33KV Vyahad feeder

Yes NoAvailable meters are of 110V DC so required voltageconversion card

16220KV Gadchiroli

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)220/66KV ICT (Make :- NGEF): Coolingcontrol cabinet of this T/F is very old anddue to percolation of leakage oil from ICTtank, most of the contactors are not working,also part of the above terminal connectorsswitches are damaged.Out of 14 nos of cooling fans, 11 nos are inworking condition.

Yes NoE-tender for repairs of T/Fcooling fan is underprocess.

2)220/66KV ICT (Make :- NGEF):Tap changerposition :- Tap changer mechanism rod issealed by Mseal for arresting oil leakage,hence tap cannot be changed. Current tapposition is tap no 8 and normal tap positionis at tap no 9.

Yes No

Total O/H of Tap changerunit is required as during

the inspection ondt.06.02.2016 it is observedthat the tap changer unit is

completely wet withleakage of oil from the top.

Requires replacement.

3) 220/66KV ICT (Make :- NGEF): There are02 nos of oil pump in working condition butAC supply arrangement is not proper

Yes No

Oil pump Sr.No. 15875-DN255/4 is kept

disconneced from ACsupply which needs to beinvestigated thorougly.

4) 220/66KV ICT (Make :- NGEF): Oil levelgauge is not working presently.

Yes No

As per inspection ondt.06.02.2016, the oil levelshows'0' reading is seems

to be faulty, requiresreplacement.

220KV GadchandurS/Stn

220KV17

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




5)220/66KV ICT(Make:- EMCO)Cooling control fan:- Out of 24 nos of fansonly 09 nos are in working condition. Forremaining 15 fans either contactor or fansare to be checked.

Yes NoE-tender for repairs of T/Fcooling fan is underprocess.

6)220/66KV ICT(Make:- EMCO): Oil levelgauge:- Not working.

Yes No

The oil gauge just showingfaulty deviation of the

pointer which is incorrect.The gauge is to be

replaced.

7)220/33KV, 25MVA T/F(Make:- EMCO)AC supply MCB's and its connectors aredamaged, hence supply cannot be extend.

Yes NoTransformer is dismantledon dt. 15.01.2016 againstaugmentation scheme.

8) Detailed and latest earth results should besubmitted along with the confirmation ofICT / Transformer neutral earthingconnecting with S/stn earth grid

Yes YesEarth results taken on dtd13.06.2015

9)Vermin proofing needs to be improved. Yes YesOnly CP/RP cleaned byULTB method

10) Earth leakage to be attended.+ve to E = 152.9 ; -ve to E = 83.6

Yes NoEarth leakage meter is

required with concerneddevice.

1) 220V Battery Bank efficiency :- 50%48V Battery Bank efficiency :- <50%Needs replacement/ recondition(Date of C/D Cycle:- 04.04.2012)

Yes Yes

As per the CD cycle carriedout on dated 08.02.2015 1)220V Battery Bankefficiency :- 80% 2)48VBattery Bank efficiency :-75% .

2)TSS-1 & TSS-2 remote closing problem Yes YesReplaced by new one ondated 04.11.15 & 07.11.15.

220KV220KV Gadchandur

S/Stn17

18220KV Warora

S/Stn220KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




3) Grass cutting is required. Yes YesDone by Agency on dt.25.12.2015.

4)Oil leakage of following equipments to beattended1)220/66KV, 50MVA PTR-1,2,3,42)33KV Shegaon feeder B Ph CT

Yes YES

Till minor oil leakages fromPTR-1 & 2 33kV ShegoanCT has been replaced on22.05.15.

5)Earth resistance value to be confirmed. Yes Yes Confirmed.Value in order.

6)220/66KV PTR-1, 2,3 &4Cooling fans not working in auto mode.

Yes YesPTR-3 & 4 cooling fans areworking in AUTO Mode.

7)Post Monsoon LCM not carried out. Yes YesPost Monsoon LCM taken23.01.2016.

8) 220/66KV, 50MVA PTR-2 LV ABT meterproblem

Yes YESReplaced on dated05.04.2015.

1) Oil leakage of following equipments to beattended1)220KV TSS-2 R & Y Ph CT2)220/132KV, 100MVA ICT-I & II3) 132/33KV, 25 MVA TF- I & II

Yes

Yes (except132/33KV,

25 MVA TF-I)

Pending

2)Last C/D Cycle carried out on 12.04.2012 Yes YesCD cycle carried out ondt.14.03.2015

3) Grass cutting is required. Yes Yes Under process.4) Earth leakage ammeter on charger isfaulty

Yes Yes Attended

5) Vermin proofing needs to be improved Yes YesDone by agency on dt.02.12.2015

6) 220/33KV, 100MVA ICT-1 & 2132/33KV 25 MVA T/F-1 & 2Cooling fans not working in auto mode.

Yes No Contactor Faulty.E-tender for repairs of T/Fcooling fan is underprocess.

7) Earth resistance value to be confirmed. Yes Yes Attended

18

220KV220KV Virur S/Stn19

220KV220KV Warora

S/Stn

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




8) Metal spreading required. Yes NoRequirement sent to CivilDivision vide ltr. no. 1866Dt. 07.08.2013.

9)Post Monsoon LCM not carried out. Yes Yes Attended

10)Earth leakage to be attended. Yes NoEarth leakage Kit is notavailable. Requirementsent

1) 48V Battery bank:Cell no 18 specificgravity to be confirmed

Yes YesDone & results are withinlimit.

2)110V Battery bank Cell no 42 specificgravity to be confirmed

Yes YesDone & results are withinlimit.

3)132/33KV, 50MVA, T/F-2: Oil leakageobserved in turret CT

Yes NoTender under process atcircle level

4)132/33KV, 50MVA, T/F-3: OTI meter faulty Yes Yes Attended


6)Earth resistance value to be confirmed. Yes YesAttended & results arewithin limit.

7) 132KV UppalwadiR-Ph -191µΩY-Ph – 131 µΩB-ph -120 µΩ CRM value to be confirmed

Yes YesCRM result taken on dt.27.01.2016.R=212,Y=135,B=235

8) 25MVA, 132/11KV T/F-3 (EMCO)132KV B-PHIr = 233 microA It = 1112 microAIR values of LA stack needs to be confirmed

Yes Yes Ir=117,It=522

9)132KV Uppalwadi132KV B-PHIr = 261 microA It = 80 microAIR values of LA stack needs to be confirmed

Yes Yes Ir=118,It=467

19 220KV Virur S/Stn 220KV

20 132 KV Pardi S/Stn 132 KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




1)48V battery bank Efficiency 67%. Needs tobe replaced

Yes Yes

Efficiency wronglymentioned by M/SDevshree, Nagpur. 02 nos.of negative cells replacedby new cells. Now Efficencyincrease from 20% to 50%.

2)Vermin proofing needs to be improved Yes YesDone as ULTB workscarried out.

3)Oil leakage 25 MVA, 132/11KV T/F-I to beattended.

Yes NoTender under process atcircle level

4)Earth resistance value to be confirmed. Yes Yes Within Limit

5) 132/33KV 50MVA T/F-I (CGL)R-Ph -195Y-Ph – 195B-ph -96 Repeat the CRM

Yes Yes

5) 132/33KV 50MVA T/F-I(CGL)R-Ph -76.1Y-Ph – 73.4B-ph -64.2

6) 33KV VinkarR-Ph - 115Y-Ph – 111B-ph -110.3 Repeat the CRM

Yes Yes

6) 33KV VinkarR-Ph - 85Y-Ph – 79B-ph -55

7) 33KV KSL-I (CGL)R-Ph -191.8Y-Ph – 139.3B-ph -164.7 Repeat the CRM

Yes Yes

7) 33KV KSL-I (CGL)R-Ph -83Y-Ph – 94B-ph -89

8) 33KV VinkarR-Ph -62Y-Ph – 61B-ph -62 Repeat the timing

Yes Yes

8) 33KV VinkarR-Ph -67Y-Ph – 65B-ph -68 Megawin breakerhas the tripping time morethan 60 ms.

132 KVBesa S/Stn21 132 KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




9)33KV AanandanR-Ph -64Y-Ph – 64B-ph -64 Repeat the timing

Yes Yes

9)33KV AanandanR-Ph -36Y-Ph – 36B-ph -36

10) 33KV KSL-II (ALSTOM)R-Ph -58Y-Ph – 58B-ph -60 Repeat the timing

Yes Yes 78

1) 48V battery bank: Efficiency notconfirmed.

Yes Yes 2%

2)25MVA 132/11KV T/F-I & II Oil leakage tobe attended

Yes Yes Attended

3) Vermin proofing needs to be improved Yes Yes Attended

4)Metal spreading in yard is required. Yes Yes Attended

5)Earth leakage to be confirmed. Yes Yes

Test done but not detectedas earth leakeage isnegligable, hence cannotshow in earth meter.

6)Earth resistance value to be confirmed. Yes Yes Within range

7)132/33KV 50MVA T/F-II (CGL)R-Ph -111.2Y-Ph – 126.2B-ph -126.8 Repeat the CRM

Yes Yes

R-Ph -126.5Y-Ph – 136.7B-ph -145.6 As it is oldbreaker hence guidancerequired.

8) 33KV NaraR-Ph -47Y-Ph – 196.8B-ph -199 Repeat the CRM

Yes YesR-Ph -52.8Y-Ph – 171.9B-ph -172.9

21 132 KV Besa S/Stn

132 KV22132KV Mankapur

S/Stn

132 KV

Yes/No


If notattended,

reason

Yes/No







Sr.No.


Protection Audit

S/svoltage




9) 33KV MRS UGR-Ph -58Y-Ph – 57B-ph -57 Repeat the timing

Yes YesR-Ph -57Y-Ph – 57B-ph -58

10) 33KV Amravati road gorewadaR-Ph -62Y-Ph – 60B-ph -60 Repeat the timing

Yes YesR-Ph - 61Y-Ph – 65B-ph - 69

11)132KV Ambazari-I132KV R-PHIr = 264 microA It = 1095 microAY-Ph Ir = 280 microA It = 1067 microAB Ph Ir = 221 microA It = 1078 microAIr values of LA stack needs to be confirmed.

Yes Yes

Ir = 123 microA It = 544microAY-Ph Ir = 127 microA It =505 microAB Ph Ir = 120 microA It =543 microA

12) 132KV Hingna-I132KVY-Ph Ir = 183 microA It = 1025 microAB Ph Ir = 323 microA It = 1107 microAIr values of LA stack needs to be confirmed

Yes Yes

Y-Ph Ir =156 microA It =1017 microAB Ph Ir = 104 microA It =651 microA

13) 132KV Uppalwadi-IY-Ph Ir = 225 microA It = 1103 microAB Ph Ir = 155 microA It = 963 microAIr values of LA stack needs to be confirmed

Yes Yes

Y-Ph Ir = 196 microA It =1103 microAB Ph Ir = 137 microA It =948 microA

132KV MankapurS/Stn

132 KV22

Yes/No


If notattended,

reason

Yes/No



1 BABHALESHWAR 400Zone 1 seeting of 400kV & 220kV lnes areset to 90% instead of 80% which needs to berevised to 80%.

NA NA NA NA NA NATo be carried out byexternal agency

2 DHULE 400 Found in order NA 26.12.2014

3 KHADAKA 400 Found in order NA NA NA NA NA NA 26.12.2014

4 DEEPNAGAR 400 Found in order NA NA NA NA NA NA 26.12.2014

5 MALEGAON 220 Found in order NA NA NA NA NA NA 22.09.2014

6 NASHIK GCR 220 Found in order NA NA NA NA NA NA 30.07.2014

7 NASHIK OCR 220 Found in order NA NA NA NA NA NA 30.07.2014

8 BABHALESHWAR 220 Found in order NA NA NA NA NA NA 20.12.2014

9 DHULE 220 Found in order NA NA NA NA NA NA 26.12.2014

10 CHALISGAON 220 Found in order NA NA NA NA NA NA 26.12.2014

11 DEEPNAGAR GCR 132 Found in order NA NA NA NA NA NA 22.11.2014

12 DEEPNAGAR ECR 132 Found in order NA NA NA NA NA NA 22.11.2014


Name of Zone:Nasik

Sr.No.


Protection Audit

S/svoltage






Yes/No


If notattended,

reason

Yes/No



1 400kV Lonikand II 400kVForcebly ON/OFF command bypassinginterlocks of isolator through Areva MakeSCADA

Yes Yes.For isolators forceblyON/OFF commands

disable through SCADA

2 220kV Talegaon 220kV1) Zone 1 seeting of 400kV & 220kV lnesare set to 90% instead of 80% which needsto be revised to 80%.

YES Yes.

Siemens make distanceprotection relay suaitablefor short distance line is

provided.

3 220kV Bhosari I 220kV

For selective tripping of TBC CTs to beprovided for TBC bay. After commissioningof 220KV Bussectionalizer (ABB make PASS)modification of configuration and wiring inbusbar is required,

Yes No Jun-16For Bus Barconfiguration,matter istaken with M/S NR.

4 132kV Kharadi 132kV132kv Markal Line Backup relay is Statictype needs to be replaced. TC1 & TC2 relayare faulty, Trip Coil 2 is fault

YES Mar-16 Work is in progress

5132kV

Ganeshkhind132kV

Display of 132KV Chinchwad bay Distancerelay Make-GE is faulty.

Yes No Mar-16Matter is taken with M/SGE by O&M authority.

1) 132kV Ujani line Distance relay foundfaulty and replaced.

Yes Yes

2) 132kV Akkalkot Line problem in N/Tswitch wiring.

Yes Yes

7220kV South

solapur220kV

1) BCU and BU were clubbed and thereforeAREVA make MICOM C264 firmwareupgradation required.

Yes Yes

6 220kV Bale 220kV


Name of Zone:Pune

Sr.No.


Protection Audit

S/svoltage






1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Yes YesCarried out on 27.05.15 &completed.

2) Zone 3 setting of 400kV Kalwa line is tobe revised as per guidelines.


3) Reverse Zone (Zone 4) time delay settingfor 400kV & 220kV lines are to be revised tozone 3 time delay (700 msec)


4) PSB blocking for all zones (Z1, Z2 & Z3) &unblock time delay for 400kV lines are to berevised to 2 sec.


5) 315MVA, 400/220kV ICT - 1 & 2 HV & LVBack up relay setting are to be revised as perguidelines.


6) For 315MVA, 400/220kV ICT-2, thetransformer trip protections are not groupedas per guidelines 9i.e. Group-A & Group-B),which needs to be modified.

Yes NoWill be completed by30.04.2016

7) For 80MVR, Reactor, the protections arenot grouped as per guidelines, which needsto be modified.

Yes NoWill be completed by30.04.2016

8) DRs of 315MVA 400/220kV ICT -1 & 2 areto be reconfigured as per guidelines.

Yes NoWork in progress & Will becompleted by 30.04.2016

9) Zone 2 & 3 setting of all 220kV lines is tobe revised as per guidelines.

Yes YesCarried out on 27.05.2015& Completed.

10) 400kV & 220kV lines parameters settingare to be verified with remote end s/s.

Yes YesCarried out on 27.05.2015& Completed.

400/220kVKharghar

1 400KV


Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






11) On line direction of B/U EF relays for all220kV lines are to be confirmed.

Yes YesConfirmed on 20.10.2015& completed.

12) 50MVA, 220/33kV TF-1 TF auxiliarlyprotection relay (30GHI) is found to befaulty, which needs replacement.

Yes No

Relay received afterrepairing, same will befixed during outage___ by30.04.2016

13) For 220kV lines & 50MVA TFs, CB status& TF auxiliary BI are not taken for DR, whichneeds to be wired up.

Yes NoWork in progress & Will becompleted by 30.04.2016

1) Zone3 setting of 400kV lines are to berevised as per guidelines.

Yes Yes

2) Reverse Zone (Zone 4) feature is notavailable in 400kV Padghe-1 &2 andKharghar for both Main1 & 2 (7SA513)

Yes No

3) As per guidelines, DR signals could not beconfigured as the relays are of old version,needs to be replacement.

Yes No

1) VT fuse failure time delay for 220kV linesis set 3 sec which needs to be revised to 5sec.

Yes Yes


Yes Yes

3) Zone 2 setting of 220kV Taloja line is tobe revised as per guidelines.

Yes Yes

4) Zone 2 setting & time coordination for220kV Apta -Kalwa line is to revised incoordination with EE testing, panvel.

Yes Yes

The scheme for replacmentof all CP & RP by BCPPpanel is sent to CO forapproval on Jan 16

3 220/100KV Kalwa 220KV

2 400/220kV Kalwa 400KV

1400/220kVKharghar

400KV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






1) Zone 1 setting of 220kV Kalwa/Tambati/Bombay dying lines are set to 90%instead of 80% which needs to be revised to80%.

Yes Yes

2) Zone 2 & 3 setting of 220kV Kalwa line isto be revised considering the new 220kVAKP & Bapgaon line length.

Yes Yes

3) Zone 2 setting of 220kV ACCIL line is tobe revised.

Yes Yes

4) Reverse Zone (Zone 4) time delay settingfor all 220kV lines are to be revised to zone3 time delay (700 msec)

Yes Yes

5) PSB blocking for all zones (Z1, Z2 & Z3) &unblock time delay for all 220kV lines are tobe revised to 2 sec.

Yes Yes

6) Back up relay setting for all 220kV linesare to be revised considering ROT of500msec.

Yes Yes


Yes YES

8) The 220kV HOC line Pilot wire protection,HORM4 is not in service, which needsreplacement.

Yes No

Tender for Supply, Errection &commissioning of Numericalline differential protectionrelay & ADSS cable requiredfor communuication ispublished by Zone office butdue to poor response, againtender is being floatedseparately by zone office.

9) Zone 1 setting of 100kV Patalganga line isto be revised to 80%.

Yes Yes

4 220kV Apta 220kV

4 220kV Apta 220kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






10) Zone 2 & 3 setting of all 100kV lines areto be revised as per guidelines.

Yes Yes


Yes Yes

12) PSB feature of all 100kV lines are to bedisable.

Yes Yes


Yes Yes

14) Back up relay setting for all 100kV linesare to be revised considering ROT of500msec.

Yes Yes

15) Zone 2 setting & time coordination for220kV Apta -Kalwa line is to revised incoordination with EE testing, Kalwa.

Yes YesRevised consideringMulund as a shortest line

1) Zone 2 setting of 220kV Tarapur lines areto be revised by considering 120% ofprotected line.

Yes Yes

2) Zone -2 time of 220kV Kalwa line is to becordinated with 220kV Kalwa - AKP line.

Yes Yes


Yes Yes

4) 200MVA, 220/100MVA ICT-1 HV & LVBackup relay settings are to be revised asper guidelines.

Yes Yes

2) Zone 2 setting of 220kV HOC, Apta- 2, 3&4 lines are to be revised as per guidelines.

Yes Yes

4 220kV Apta 220kV

5 220kV Borivali 220KV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






3) Zone 3 setting of 220kV HOC is to berevised as per guidelines.

Yes Yes

4) Zone 4 setting for 220kV HOC, Apta 2, 3& 4 lines are to be revised as per guidelines(2 kM)

Yes Yes

5) Reverse Zone time delay setting for all220kV lines are to be revised to zone 3 timedelay (700 msec)

Yes Yes

6) VT fuse fail setting for 220kV Apta 3, 4 &Kharghar 1, 2 and JNPT are to be revised asper guidelnes (80mA & 40mA respectively)

Yes Yes

7) 220kV lines parameters setting are to beverified with remote end s/s and respectiveline s/Dn. For 220kV Apta 2, 3 & 4.

Yes Yes

8) For 220kV Uran - HOC line PUR scheme isnot in service, which needs to be taken intoservice.

Yes Yes

9) PSB blocking for all zones (Z1, Z2 & Z3) &unblock time delay for all 220kV lines are tobe revised to 2 sec.

Yes Yes

10) The B/U relay OC setting for 220kV Apta3, Kharghar 2 lines are to be revised as perguidelines.

Yes Yes

11) The B/U relay for all 220kV lines are tobe revised considering ROT 500msec.

Yes Yes


Yes Yes

13) DR of all 220kV Lines & TFs are to be setto trigger for any start/trip signals.

Yes Yes

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






14) For DR triggering the BI for TF are to beconfigured for transformer aux. protection.

Yes Yes

1) Zone 2 & 3 setting for 220kV Mulund,Kharghar & Sonkhar lines are to be revisedas per guidelines.

Yes Yes

2) Resitive reach for ground fault is not setfor all 220kV lines, which needs to be set asper guidelines.

Yes Yes


Yes Yes

4) The Auto reclose for all 220kV lines arenot in service, it is suggested to take A/R inservice.

Yes No

The DPR SEL421 relayconfiguration issue for ARscheme. ER support for thesame not available Followupwith ER is on to take the ARscheme in service. __ by June-2016

5) PSB unblock time delay for all 220kV linesare to be revised to 2 sec.

Yes Yes

6) TF Protections are to be grouped Group-A& B as per guidelines.

Yes Yes

7) HV B/U of 200MVA 220/100kV ICT 1 & 2are non directional, which needs to be madedirectional.

Yes Yes

8) DR of all 220kV Lines & ICTs are to be setto trigger for any start/trip signals.

Yes Yes

1) Zone 2 setting for 220kV Pirngute, Bhira,Koyana, Sonaallid & ONGC lines are to berevised as per guidelines.

Yes Yes

7 220kVTrombay 220kV

Settings are revised

8 220kV Kandalgaon 220 kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage







Yes Yes

3) AR dead time for all 220kV lines are set to0.8 sec instead of 1 sec, which needs to berevised.

Yes NoProposal underprocess__09.08.2016.

4) PSB unblock time delay for all 220kV linesare to be revised to 2 sec. Also after unblocktime is over, PSB trip should be activated.

Yes Yes


Yes Yes

6) The 100KV lines B/U OC setting is to berevised as per guidelines.

Yes Yes

8) HV B/U of 100MVA 220/100kV ICT 2 &50MVA 220/100kV ICT 1 are non directional,which needs to be made directional.

Yes Yes

1) The 220V DC source 1 & 2 for 400kV lines& ICTs are to be confirmed for Group -A & Bseparately.

Yes YesDC sources seperationwork completed inDecember 2015

2) For 400kV lines Zone Zp is to be madereverse & accordingly reverse zone reach &time are to be set as per guidelines.

Yes Yes

3) For all 400kV lines Main-1 protection ,SOTF function is disable, which needs to bemade enable.

Yes Yes

4) For 400kV Dabhole 2, overvoltage setting& time delay are to be revised as perguidelines.

Yes Yes

400/220kVNagothane

9

9400/220kVNagothane

400KV

400KV

8 220kV Kandalgaon 220 kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






5) For 400kV Padghe 1 & 2 and Dhabole 1,PSB unbloced time is to be revised to 2 sec.For 400kV dabhole 2, all zones are to beblocked with unblock time to 2 sec.

Yes Yes

6) 315MVA, 400/220kV ICT 1 & 2 and500MVA 400/220kV ICT 3, cooler controlsystem is in manual mode to be taken intoauto mode.

Yes NoWork is inprogress__29.02.2016.

7) DR of all 400 & 220kV Lines & ICT/TFs areto be set to trigger for any start/trip signals.

Yes Yes

8) DT send digital channel is to beconfigured for DR.

Yes Yes

9) CB contact in LBB circuit for 400 & 220kVlines are to be bypassed.

Yes Yes

10) For 220kV lines, zone3 time delaysettings are to be revised as guidelines.

Yes Yes

11) For 220kV ACCIL & POSCO lineSOTF/TOR to be made enabled. All 220kVLines SOTF delays is to be revised 1 sec.

Yes Yes

12) For all 220kV lines AR is set to 1ph + 3phtrip which is to be revised to 1 ph.

Yes Yes

13) PSB unblock time delay for all 220kVlines are to be revised to 2 sec.

Yes Yes

14) The 220KV lines B/U OC setting is to berevised as per guidelines.

Yes Yes


Yes Yes

400/220kVNagothane

9 400KV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






1) Zone 1 setting for all 400kV & 220kV linesare tb revised to 80% intead of 90%presenet adopted.

Yes Yes

2) Zone 2 & 3 setting for 400kV Kalwa 1 &2and Zone 3 setting for 400kV Boisar, Tarapur1 & 2 lines are to be revised as perguidelines respectively.

Yes Yes

3) For relay setting calculation of 400kVboisar line, the longest line length fromBoisar(PGCIL) s/s is considered 94kM forcalculation purpoase. However aftertelephonic discussion with PGCIL engineer,the line length is 102kM, sme may beconfirmed & accordingly setting can bechanged.

Yes Yes

4) For all 400kV lines, the SOTF feature isenabled for Z1 & Z2 fault impedance only. Itis suggested to modify the setting for allzones i.e. Z1, Z2 & z3 fault impedance.

Yes Yes

5) It is observed that in MICOM P442numerical distance protection relay , Autoreclose mode is kept 1/3 i.e. single/threephase mode. It is suggested to changed theAR mode to 1 i.e. single phase wherever it ispossible.

Yes Yes

10 400/220kV Padghe400

/ 220kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






6) For verification of correctness ofResistative reach setting for ground & phasefault, data of remote end TF capacity & %impedance considered, however for one ofthe s/s it is not matching with present Tfcapacity. It is suggested to verify the datafrom remote end and modify the settingaccordingly.

Yes Yes

7) Reverse Zone time delay setting for all400kV & 220kV lines are to be revised tozone 3 time delay (500 &700 msecrespectively)

Yes Yes

8) B/U HV & LV realy of 400kV ICT 1 , 2, 3 &4 ROT is kept 650msec, the ROT of these b/urelays are to be revised to 500msec as perguidelines.

Yes Yes

9) 400kV ICT-4 the RTCC panel is notprovided, which needs to be purchased/provided and commissioned immediately.

Yes No Scheme is being prepared

10) The local / remote operation of OLTC of400kV ICT 1, 2 & 3 are not checked as panelsare old. It is suggested to checked & if notoperative, necessary overhauling orreplacement is to be done.

Yes Yes

11) WTI / OTI reading of all 400kV ICTs arenot matching with the meter provided atRTCC, same may be checked & correced.

Yes Yes

400/ 220kV

400/220kV Padghe10

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






12) The 400kV Bus & line reactor areprovided with all static relay exceptimpedance relay, thes relays needs to bereplaced by state of art numerical relays.

Yes NoRequirement is submittedat CO

13) The differential relay RET670 ABB makeof 400kV ICT 2 is having diplay problem assuch HIM of relay is not showing any data, itis suggested to replaced the said relay byspare one and the relay for repair at M/s ABBworks.

Yes Yes

14) The Main -2 distance protection of400kV Kalwa 1 REL 670 relay is havingdisplay problem & needs replacement. Thespare relay is available at site, hence it issuggested to retrofit/replace the main 2faulty relay immediately.

Yes Yes

15) Zone 2 & 3 setting for 220kV Nashik 2and for 220kV Nalasopara line, Zone 2 & 3setting is to be revised to 120% & 200% ofline length as it is redial feeding s/s. Thesettings are revised accordingly.

Yes Yes

16) The 220kV lines B/U relay, the EF Plugsetting is to be revised to 30% as perguidelines.

Yes Yes

17) The 220kV lines B/U relay setting ROT isto be revised to 500msec as per guidelines.

Yes Yes

10 400/220kV Padghe400

/ 220kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






18) The 220kV ICT B/U HV & LV relay settingis to be revised considering the ROT500msec & 400msec respectively.

Yes Yes

19) The HV & LV bB/U relay setting for50MVA, 220/22kV TF 1 & 2 are to be revisedconsidering the ROT 500msec & 350msec asper guidelines.

Yes Yes


Yes Yes

21) The B/U relays of 440kV & 220kV ICTsare old electromechnical/static, which needsto be replaced by numerical relays.

Yes Yes

22) The local/remote operation of OLTC of220kV ICT 2, 3 & 4 and 50MVA TF 1 & 2 arenot checked. It is suggested to checked & ifnot operative, necessary overhauling orreplacement is to be done.

Yes Yes

23) The ABB make SMS is not working.Further M/s ABB is also not responding evenafter continous follow up by concerned, theissue must be taken up at CO & bring theSMS scheme in service.

Yes Yes

24) The GPS of SMS system is not working,as such relays are not synchronised with GPSand time stamped DR is not available. It issuggested to take up the issue with supplier& bring the GPS system in service.

Yes Yes

400/ 220kV

400/220kV Padghe10

10 400/220kV Padghe400

/ 220kV

1 2 3 4 5 6 7 8 9 10 11

Yes/No


If notattended,

reason

Yes/No




Name of Zone: Vashi

Sr.No.


Protection Audit

S/svoltage






25) The LBB relays for 440kV & 220kVlines/ICT/TF are not provided with separateDC circuit independent from Gr. A & Gr. Bexcept 400kV Tarapur 1 & 2 and Talegaon.The necessary modification is to be done inthis respect.

Yes Yes

400/ 220kV

400/220kV Padghe10

No. of Defectsin Category A

AttendedYes/NO

Reason fornotattended


AttendedYes/NO


1 132KV Barwala 132 22/6/122 132KV Paliyad 132 19-20/6/123 220KV Dhasa 220 07/12/20124 220 KV Botad 220 17/7/20125 132KV Vallabhipur 132 21/6/126 220KV Otha 220 07/05/20127 220KV Savarkundla 220 16/7/20128 220KV Sagapara 220 07/06/20129 220KV Vartej 220 07/10/2012

10 220KV Anjar 220 22/11/201311 132 KV Samakhiyali 132 23/05/201212 220KV Shivlakha 220 26/12/201313 220 KV Kukma 220 25/12/201314 220KV Nakhatrana 220 20/12/201315 220KV Nanikhakhar 220 27/12/201316 220KV Tappar 220 23/12/201317 132KV Ankleshwar 132 24/9/1218 132KV Valia 132 23/8/1219 220KV Acchalia 220 29/9/1220 220 KV Wagra 220 09/06/201221 220KV Dahej 220 20/9/1222 220KV Kim 220 09/05/201223 220KV Zagadia 220 22/9/1224 220KV Haldarwa 220 09/07/201225 132KV Bharuch 132 18/9/1226 132KV Wankaner 132 14/02/201427 220KV Lalpar 132 02/07/201428 132KV Jasdan 132 15/02/201429 132KV Dhrol 132 02/04/201430 220KV Gondal 220 22/02/201431 132KV Vajdi 132 03/05/201432 220KV Nyara 220 26/02/201433 132KV Vikram 132 02/07/201434 220KV Morbi 220 02/05/2014

Format for Protection AuditName of Utility: Gujarat Energy Transmission Corporation Ltd.

Sr.No.

Name of CircleName of the Substationidentified for audit

S/SVoltage

(KV)

Date on which auditconducted/completed

Observations ofProtection Audit

Remark(Defect)

Deficiences that involves procurment(Category B)

Amreli

Circle/ substaionwise

observation reportenclosed herewith.

NA

No. of Defects:-77Attended(nos.):-77Pending(nos.):- 0

Anjar



NA


Nil NA

NANil9797

Bharuch



NA


Gondal



NA


NANil

NANil7878

Deficiences that can becorrected without procurment

(Category A)

77 77

35 35


AttendedYes/NO



AttendedYes/NO


Sr.No.


S/SVoltage

(KV)



Remark(Defect)



(Category A)

35 132KV Idar 132 19/6/1236 132KV Visanagar 132 20/6/12

06/10/201206/10/2012

39 220KV Bhutiya 220 27/6/1240 220KV Jamla 220 30/6/1241 220KV Vijapur 220 22/6/1242 220KV Dhansura 220 07/04/201243 132KV Talod 132 23/6/1243 132 KV Tilakwada 132 30/4/1344 132 KV Vasedi 132 05/03/201345 220KV Godhra 220 22/5/1346 132KV Dahod 132 05/07/201347 220KV Jambuva 220 24/05/201348 220KV Chandrapura 220 24/5/1349 220KV Gavasad 220 25-6-201350 132KV Gotri 132 07/02/201351 220KV Waghodia 220 30/6/201352 132KV J' Nagar 132 31-6-201353 132KV F"Nagar 132 06/11/201354 132KV Karjan 132 07/03/201355 132KV Manjusar 132 30-6-201356 132 KV Limkheda 132 06/02/201357 132KV Nandesari 132 07/04/201357 220KV Ranavav 220 20/02/201458 132KV Bhatia 132 21/02/201459 220KV Jamnagar 220 14/02/201460 132KV Khambhalia 132 14/02/201461 132KV Naghedi 132 14/02/2014

38 220KV Agiyol 220


28 28 Nil

Himmatnagar



NA


Jambuva



NA

No. of Defects:-125Attended(nos.):-125

Pending(nos.):-

Jamnagar



NA

93 93

NA

Nil NA

125 125 Nil NA


AttendedYes/NO



AttendedYes/NO


Sr.No.


S/SVoltage

(KV)



Remark(Defect)



(Category A)

62 132 KV Bhayavadar 132 18/8/1263 132KV Junagadh 132 09/07/201264 220KV Keshod 220 09/08/201265 132 KV Dhoraji 132 22/8/1266 220KV Motipaneli 220 24/08/201267 220KV Sardargadh 220 09/07/201268 220KV Visavadar 220 25/6/1269 132KV Haripur 132 26/6/1270 132KV Talala 132 27/6/1271 220KV Timbdi 220 07/02/201272 220 KV Kansari(Dhokalva) 220 07/04/201273 132 KV Patan 132 12/02/201374 132 KV Siddhpur 132 27/11/201375 220KV Kheralu 220 26/12/201376 220KV Sankhari 220 29/11/201377 220KV Chhatral 220 21/11/201378 220KV Mehsana 220 21/12/201379 220KV Mitha 220 12/10/201380 132 KV Sabarmati 132 05/12/201281 220KV Salejada 220 30/5/1282 132KV Ode 132 30/4/1283 132KV Undel 132 20/05/1284 220KV Kapadwanj 220 06/09/201285 220 KV Bhat 220 31/05/1286 132KV Narol 132 22/05/1287 132KV Chiloda 132 24/7/12

90 132KV Mahemdabad 13219/05/12,15/7/2012

91 220KV Khanpur 220 19/7/1292 132KV Nadiad 132 18/05/12

88 220KV Karamsad 220 29/4/12

89 220KV Ranasan 220

Junagadh



Mehsana



Nadiad

17/05/12


observationreport

enclosed herewith.

NA


Pending(nos.):-0

NA


NANo. of Defects:-41Attended(nos.):-41Pending(nos.):- 0

89 89 Nil NA

41 41 Nil NA

266 266 Nil NA


AttendedYes/NO



AttendedYes/NO


Sr.No.


S/SVoltage

(KV)



Remark(Defect)



(Category A)

93 220KV Bhilad 22094 220KV Talangpore 220 08/06/201395 220KV Ambheta 220 25/5/1396 132KV Atul 132 16/05/1297 132 KV Bhestan 132 06/10/201398 220KV Ichhapore 220 06/07/201399 220KV Mota 220 05/11/2013

100 220KV Navasari 220 22/5/13101 220KV Vapi 220 09/02/2013102 220KV VAV 220 05/09/2013103 220 KV Thavar 220 09/05/2012104 220KV Tharad 220 09/01/2012105 132 KV Deesa 132 09/06/2012106 220KV Deodar 220 09/11/2012107 220KV Jangral 220 25/8/12108 220KV Palanpur 220 22/8/12109 220KV Radhanpur 220 14/9/12110 220KV Agarthala 220 29/8/12111 132KV Dhandhuka 132 29/1/2013112 132KV Sitagadh 132 30/1/2013113 132KV DHANKDHRA 132 23/1/2013114 220KV Halvad 220 25/1/2013115 220KV Limbdi 220 31/1/2013116 220KV Viragam 220 28/02/2013117 220 KV DUDHREJ 220 02/02/2013118 220 KV RAJPAR 220 02/05/2013119 220 KV BALA 220 02/06/2013120 220 KV ADALSAR 220 23/01/2013121 220 KV DHANKI 220 03/05/2013


Pending(nos.):-0

Navsari



NA


Palanpur



NA


Surendranagar



NA120 120 Nil NA

90 90 Nil NA

52 52 Nil NA

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend

400 KVKhedamara

400/ 220KV

TractebelIndia,WRLDC &

CSPTCLEngineers

12 - 20 Feb'16

1. M II protection for 220 KV BRSSI&II,Raipur,Urla,Bemetara and Thelkadihfeeders are not available.2. DC leakage to be monitored

S.No.2 Yes - S.No.

1 No 31.12.2016 -

220 KVBemetara

220/ 132KV

CSPTCLEngineers 13.03.13

1. Carrier protection is not available..2. 2nd DC battery set is not available.3. GPS time synchronizing facility is notavailable.4. M II protection for 220 KV feeder notavailable.5. DC leakage to be monitored.

S.No.5 Yes - Yes for S.No.

1 to 4 No 31.12.2016 -

220 KV Gurur 220/ 132KV


1. Carrier protection is not available..2. M II protection for 220 KV feeder notavailable.3.DC leakage to be monitored.


1 & 2 No 31.12.2016 -

220 KV Suhela 220/ 132KV


1. Carrier protection is not available..2. GPS time synchronizing facility is notavailable.3. M II protection for 220 KV feeder notavailable.4. DC leakage to be monitored.


1 to 3 No 31.12.2016 -

220 KVBhatapara

220/ 132KV


1. Carrier protection is not available..2. 2nd DC battery set is not available.3. GPS time synchronizing facility is notavailable.4. M II protection for 220 KV feeder notavailable.5. DC leakage to be monitored.6. LBB protection not available.


1 to 6 except 5 No 31.102.2016 2nd battery setcomm.

220 KV Mopka 220/ 132KV


1. Carrier protection is not available..2. 2nd DC battery set is not available.3. GPS time synchronizing facility is notavailable.4. M II protection for 220 KV feeder notavailable.5. DC leakage to be monitored.6. LBB protection not available.7. Synchronization trolly not available.


1 to 7 except 5 No 31.10.2016 -

PROTECTION AUDIT DEFFICIENCIES/OBSERVATIONS COMPLIANCE [As on 30.06.2016]Name of Utility : CHHATTISGARH POWER TRANSMISSION COMPANY LIMITED

Name of S/Sidentified for

protectionaudit

S/Svoltage

Name of 3rdparty protection

audit agency

Date on whichaudit

conductedObservations of protection audit

Deficiencies that can becorrected without procurement

(Category-A)

Deficiencies involving procurement(Category-B)

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


220 KV Banari 220/ 132KV




1 to 6 except 5 No 31.12.2016 -

220 KV Siltara 220/ 132KV




1 to 7 except 5

NoexceptS.No. 2

31.12.2016 2nd Battery setcomm.

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


220 KV Doma,Raipur

220/132KV




1 to 4 No 31.10.2016 -

220 KVParaswani

220/132KV




1 to 5 except 5

NoexceptS.No. 2


220 KV Urla 220/ 132KV




1 to 6 except 5

NoexceptS.No. 2


220 KVThelkadih

220/132KV

CSPTCLEngineers



1 to 4 except 2

NoexceptS.No. 2


220 KVBarsoor

220/132KV




1 to 6 except 5

NoexceptS.No. 2


Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


220 KV Bhilai 220/132KV


1. Carrier protection is not available.2. M II protection for 220 KV feeder notavailable.3. DC leakage to be monitored.4. LBB protection not available.


1 to 4 except 3 No 31.12.2016 -

220 KVKotmikala

220/ 132KV




1 to 7 except 5 No 31.10.2016 -

220 KVRaigarh

220/ 132KV




1 to 7 except 5 No 31.12.2016 -

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


1. Separate two sets DC system isrecommended for switchyard protection No Yes No

Estimate andRequisition forseparate DC sourcehas been sent forapproval.

2. Carrier Protection is out of service. Yes

Yes, for 220kV KorbaEast-WestI/C No. I&II

Rest feeder'scarrier prot.ckt checked& founddefiencies

Yes NoFor carrier protectionpanel/cardsprocurementrequired.

3. Disturbance Recorder and SERs arenot available. Yes No

Tenders opened &procurement underprogress.

4. Old THR make Static DPR relaysneeds to be replaced by numericalrelays

Yes Yes Attended

5. Auto re-closer is not available. Yes NoChecking ofcircuits underprogress.

Auto reclose of 220KV Korba-Budipadarckt-3 is checked &put in service.In otherfeeders A/R ckts isOK and will be put inservice afterconfirmation fromother end.

6. Bus Bar Differential scheme is notavailable. Yes No

7. All relay settings are verified andfound to be generally in order. Yes Yes

8. Multiple Earthing is not found in CTsecondary. Yes Yes

9. PSB feature is Enabled for Z2, Z3,and Z4. Yes Yes

Name of Utility : CHHATTISGARH POWER GENERATION COMPANY LIMITED

220 KV KTPS,Korba (E) 220 KV

M.K.BanchhorCSPTCL,

N.P.DewanganNTPC, N.K.BizoraCSPGCL, G.P.Rai

CSPGCL,S.C.Chakraborty

CSPGCL

25.04.2013

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


10. Synchronizing Panel is available forall feeders except Budhipadar FeederNo-III for that individual SynchronizingTrolley has provided.

Yes Yes

220 KV KTPS,Korba (E) 220 KV

M.K.BanchhorCSPTCL,

N.P.DewanganNTPC, N.K.BizoraCSPGCL, G.P.Rai

CSPGCL,S.C.Chakraborty

CSPGCL

25.04.2013

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


1) Two independent source of 220 V DCare available in Switchyard.No DCleakage observed.

YES YES

2) All relay settings are verified & foundgenerally in order. YES YES

3)Dual channel carrier protection isavailable in all 220 KV feeders but keptout YES No

Due to nonavailability ofPanel atremote end.

4) DRs are available in Numeric relaysand SER is available. YES YES

5)Multiple earthing of CT secondarycore is not available.CT secondaryearthing is provided in Panel only.

YES YES

6) 01 no synchronising trolley isavailable & in working condition. YES YES

7)PSB feature is enabled & in blockingcondition for Z2,Z3 & Z4. YES YES

8) Auto reclose is available but presentlykept out. YES No

As carrierprotection isout.

9) Bus Bar differential scheme isavailable but presently kept out. YES No

To becheckedbefore put inservice

30.06.2016 Order placed on M/sABB forrecommissioning.

1) Un availability of Main-II protection

Yes

2) Un availability of Auto reclosescheme.

Yes

220 KVDSPMTPS,

Korba220 KV

Third PartyProtection Audit

was carried out bySE(ET&I-I)

HTPS,CSPGCL,Representative of

NTPC,EE,CSPTCL,EE(Testing),DSPMTPS,CSPGCL

25.04.2013

Korba WestTPS 400 KV NTPC & CSPTCL

Engineers 26.04.2013

Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


3)Un availability of B/B differential &LBB protection

No Yes

New Bus Bar panelcommissioning workhas been completedand 400 KV Bus Barprotection is takeninto service from27.04.16.

4)GPS is available however no relay issynchronised with it. No Yes

5) Committee recommended to replaceABCB with SF6 breakers &commissioning of isolator sequentialoperation with ABCB opening.

No No 31.03.2017

Replacement ofABCB with SF6breakers is includedin the scope of workof R&M of stationproposed in year2016-17



Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


1) Second DC system is recommended .Yes No 31.03.2017

Proposed in the year16-17 in Refurbish

Scheme.2) To renovate/retrofit Main-I & Main-IIProtection with numeric relays in all outgoing feeders.

Yes

Main-I & Main-IIProtection withnumeric relays in allout going feederscompleted on28.12.2014

3) Carrier Protection is not in service.

02 no. havebeencommissioned in KEB-KWB interconnectors

Yes No 31.09.2016

In KEB-KWBinterconnector I & IIcarrier protection hasbeen taken inservice.In KW-DSPMI/C,action fromDSPM isawaited.Other 3feeders falls underCSPTCL scope

4) Disturbance Recoder and SER s arenot available.

Yes No 31.12.2016

Bay control panelsfor SCADA systemhave been received.M/s ABB is beingpersuaded tocommission thesame as early aspossible.

5) Non availability of Auto reclosescheme.

Yes No 30.12.2016

Scheme is readyfrom KWBend,waiting forconsent forconnected substations.



Remarks

Yes /No


If notattended,

reason

Yes /No


If no,expected date

to attend



protectionaudit

S/Svoltage


audit agency

Date on whichaudit



(Category-A)


6) Non availability of B/B differential

Yes No 31.12.2016 Work underprogress.

7) Non availability of LBB protection

Yes YES LBB has been kept inservice

8)GPS is available however no relay issynchronised with it.

Yes No 31.12.2016

After commissioningof SCADA panel,Relays will besynchronised.GPSfacility is available inSCADA.



MPPGCL

Name of The Entity - Madhya Pradesh Power Generation Corporation Limited. (MPPGCL)Quarterly Protection Audit Report for the period of April 2016 to June 2016

Observation of Protection Audit PRESENT STATUS

YES/NOWHETHERATTENDEDYES/NO

IF NOTATTEND,REASON


IF NO,EXPECTEDDATE TOATTEND

1 ATPS#5 220

Hathway make GPS time synchronising system is providedbut connected on 220 KV Birsinghpur-3 & Sidhi feedersonly, all other relays of feeders & transformers are to beconnected.

YES YES COMPLETED

2 ATPS#5 220REF protection not provided on 220/132 kv ICTs, it issuggested to provide the same.

NOT REQUIRED; DUE TO SHIFTING OF132 KV SWITCYARD

3 ATPS#5 220220 kv static Bus Bar Protection scheme make ABB, typeRADSS is available at site since 2000, but awaited forcommissioning.

YES YES

4 ATPS#5 220LBB Protection is not provided for any element and it issuggested to take in service at earliest

YES YES

5 ATPS#5 220ASEA make 132 kv MOCBs are in service,which is veryold and inaquate as per the increased fault MVA of thesite.It is suggested to replace same

NOT REQUIRED; DUE TO SHIFTING OF132 KV SWITCYARD

6 ATPS#5 220

Auto Reclosure feature is provided for 220 KV Birshingpur- 3, Jabalpur I & II and Sidhi feeders only. For other 220KV feeders Auto Reclose facility is available but not becommissioned due to non availability of PLCC protectioncouplers.

YES NO OCT'16DELAY IN COMPLETION DUE TO NON-AVALIABILTY OF PLCC PANELS FROMMPPTCL FOR OTHER END

7 ATPS#5 220

One set of 600 AH battery set is provided for switch yard,which is very old and in poor condition its need earlyreplacement.Battery Capacity test could not be done due tosome opertional problem.

YES NO OCT'16PROCUREMENT OF BATTERY IS INUNDER PROCESS.

8 ATPS#5 220

A stand by DC supply is available at switchyard to powerplant,DC load of 220 kv panels are running on thissupply.It is recommended by committee to provide separateDC supply arrangement for power plant and switchyard.

YES NO OCT'16 PROCUREMENT IS IN UNDER PROCESS

9 SGTPS 1 TO 4 220Partial DC leakage observed, it is advised to recify thesame.

YES YES COMPLETED

Deficiencies that can be correctedwithout procurement (Category-A)


BUS BAR PROTECTION SCHEME ANDLBB PROTECTION HAS BEENCOMMISSIONIED ON DATED08/10/2015.(COMPLETED).

Sl.No.

Name ofSub-Station

identified forProtection Audit

S/S VoltagekV

Page 1 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

10 SGTPS 1 TO 4 220220 KV Bus Bar Protection is available but not in servicedue to some problems

YES YES

11 SGTPS 1 TO 4 220LBB Protection relay are available but protection are notprovided for any element and it is suggested to put the samein service.

YES YES

12 SGTPS 1 TO 4 220SER/DR is not installed but it available in numerical relaysprovided in 220 kv pali interconnector-I and 220 kv Sukhafeeders only.

YES YES

SER/DR FACILITY IS AVAILABLE INEASUN REYROLLE MAKE CSC-101 DPRRELAY INSTALLED AT 220 KVOUTGOINING FEEDERS.

13 SGTPS 1 TO 4 220Auto reclose facility not provided on any 220 kV feeders. Itis intimated that protection couplers are not available and itis suggested to provide the same.

YES NO OCT'16

CGL MAKE PLCC PANEL DRAWINGAPPROVED ON DATED 11.01.2016 ANDMATERIAL WILL BE SUPPIED WITHIN 2-3 MONTHS.WORK LIKELY TO BECOMPLETED UPTO OCT-2016.

14 SGTPS 1 TO 4 220GPS based time synchronisation facility is not available. Itis suggested to provide the same.

YES NO OCT'16 PROCUREMENT UNDER PROGRESS.

15 SGTPS 1 TO 4 220A separate source for 220 kV dc supply is provided forelectrical control room and 220 kv switchyard. This batteryset is very old, commissioned 1991 needs replacement.

YES NO OCT'16TENDERING FOR PROCUREMENT ISUNDER PROCESS.

16 SGTPS 1 TO 4 220Emulsifier system is provided on GT and UAT for Fireprotection. Same is operate manually.

YES NO OCT'16

SYSTEM IS WORKING IN MANUALMODE AND BUDGETARY OFFER FORNITROGEN BASED FIRE PROTECTIONSYSTEM ARE OBTAINED AND SAMEWILL PROCURE AFTER TECHNICALAND ADMISTRATIVE APPROVAL.

17 SGTPS # 5 400

Static Bus Bar Protection scheme is provided on 400 kVbus make ABB Type-RADHA. A numerical Bus-Barprotection scheme may be provided as suggested by thecommittee.

YES NO SEPT'16

ORDER PLACED TO M/s SEIMENSMUMBAI VIDE ORDER NO. 511-0100/SGTPS/P&W/ENIT-0/T-3194/15-16/ET&I-III/ORD-226/4515,BRS DATED10.02.16 AND WORK SHALL BECOMPLETE WITHIN 5 TO 6 MONTHS.

18 SGTPS # 5 400DG set available in power plant and it is suggested by thecommittee to extend AC supply as stand by to 400 kVcontrol room and switchyard in case of emergency.

YES NO OCT'16CABLE WORK UNDER PROGRESS FROMACDB SWITCHYARD TO DG SET.

COMPLETED

Page 2 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

19 SGTPS # 5 400Spare unit of single phase ICT is not ready to use, it shouldbe attented and kept in ready condition in case ofemergency.

YES YES COMPLETED

20 SGTPS # 5 400High voltage problem are reported and it is suggested toprovide bus reactor or line reactor on 400 kv BRS-Damohline I & II at BRS end.

NOT POSSIBLE AS AVALIABILE SPACEHAS ALREADY BEEN UTILISED BY M/sPGCIL.

21 SGTPS # 5 400400 KV BRS - BAlCO and BRS-Vandana Power(KORBA) bays belongs to PGCIL

UNDER SCOPE OF M/s PGCIL.

22 STPS PH-I 220No GPS in control room and it is necessary for the rootcause analysis of the disturbance occurred in the grid

23 STPS PH-I 220

In the protection scheme electromechnical and static relayare in use but as per present grid norms avaliabilty ofnumerical relay is required for fault analysis and eventrecorder.

24 STPS PH-I 220Fire protection system of transformers are out of order andsuitability of nitrogen injection fire protection system maybe explored.

25 STPS PH-II 220 Scaling is observed on the terminal of some of the batteries. YES YES COMPLETED

26 STPS PH-II 220L&T make switchgear indicating lamp assembly is missingand they are vacant i.e whole are uncovered.

YES YES COMPLETED

27 STPS PH-II 220No GPS in control room and it is necessary for the rootcause analysis of the disturbance occurred in the grid

YES NO DEC'16ESTIMATE PREPARED FORAPPROVAL.

28 STPS PH-II 220Some of the cells of unit no.7 are bulged in plante typebattery set which resulting in breaking of the container andlid therfore it should be replaced at the earliest.

YES YES COMPLETED

29 STPS PH-II 220Some of the cell are bypassed due to bulging problemthereby reducing the available capacity of the bank.

YES YES COMPLETED

NOT APPLICABLE BECAUSE ALL 5UNITS OF PH-I HAS ALREADY RETIRED.

Page 3 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

30 STPS PH-II 220

Battery bank of unit 6& 7 were commissioned in the year2004 & 2001 respectively.As per CEA circular fair life ofbattery is 5 years only therefore suitable action for theirreplacement is to be initiated at the earliest.

YES NO SEPT'16

RECONDITIONING OF UNIT NO.7BATTERY BANK HAS BEEN CARRIEDOUT RECENTLY (i.e APRIL-2015) ANDFOR UNIT NO.6 LOI HAS BEEN ISSUED..

31 STPS PH-II 220No alarm for DC E/F is provided in the chargers.

YES YES COMPLETED

32 STPS PH-II 220Capacity test has not been conducted recommended to doonces in a year.

YES YES COMPLETED

33 STPS PH-II 220

In the protection scheme electromechnical and static relayare in use but as per present grid norms avaliabilty ofnumerical relay is required for fault analysis and eventrecorder.

YES NO OCT'16

GENERATOR PROTECTION NUMERICALRELAY HAS BEEN INSTALLED IN UNITNO.7.THE NUMERICAL RELAY FORUNIT NO.6 WILL BE COMMISSIONED INNEXT OVERHAULING.

34 STPS PH-II 220 Pole slip protection is not available so it shall be provided. YES NO NOT APPLICABLE

35 STPS PH-II 220Auto reclosure/Disturbance Recorder/Event Logger/SER allare not available.

YES NO DEC'16

NUMERICAL RELAY HAS BEENCOMMISSIONED IN DPR WHICHCONTAIN ALL THE MENTIONEDFEATURES,BUT CARRIER SCHEME ISNOT AVAILABLE THEREFORE AUTORECLOSING FEATURE COULD NOT BEESTABLISHED.FOR THIS CARRIERPROTECTION PANELREQUIREDTHEREFORE ESTIMATE HAS BEENSUBMITTED FOR APPROVAL.

36 STPS PH-II 220 Carrier Protection is not available in 220 kV switchyard. YES NO DEC'16TENDER WORK FOR CARRIERPROTECTION IS IN PROCESS.

37 STPS PH-II 220 Earth Mettaling is not visible in 220 kV switchyard YES NO AUG'16 WORK IS IN UNDER PROCESS.

38 STPS PH-II 220Mulsi Fire protection of the transformer is out of order,suitability of Nitrogen injection may be explored

YES NO DEC'16THE WORK OF PROVIDING FIREHYDRANT IS IN PROGRESS BYMECHANICAL DEPARTMENT.

Page 4 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

39 STPS PH-II 220Suitability of short circuit breaking capacity of circuit bkr& short time current capacity of CT's shall be reviewed inrespect of exsisting fault level's

YES NODUE TO DISCONTINUATION OF 312.5MW OF PH-I,FAULT LEVEL HAS GOTREDUCED CONSIDERABLY.

40 STPS PH-III 400220v dc battery source - no alarm for dc e/f is provided inthe chargers. YES YES COMPLETED

41 STPS PH-III 400220v dc battery source - capacity test has been conductedin the year 2011. recommended to do the capacity test oncein a year.

YES YES COMPLETED

42 STPS PH-III 400

220 V DC battery source - records indicated the voltagemeasurement of individual cells with the charger oncondition. This readings are to be taken with charger offcondition also.

YES YES COMPLETED

43 STPS PH-III 400

220 V DC battery source - Scaling is observed on theterminals of some of the batteries. Also the generalcleanliness of the batteries and battery room needimprovement.

YES YES COMPLETED

44 STPS PH-III 400ISP Feeder - Over voltage stage i and stage ii protectionhas been provided through separate rxeg-21 relays.

YES YES COMPLETED

45 STPS PH-III 400ISP Feeder - over voltage stage ii setting has been adoptedas 130% . this should be reviewed.

YES YES COMPLETED

46 STPS PH-III 400 No gps in 400kv control room . YES NO DEC'16TENDER OPENED AND CASE IS UNDERPROCESS.

47 STPS PH-III 400

220 V DC battery source - 216 V Dc battery source ofunit# 8 of 1200ah capacity - It was commissioned in theyear 2004. As per cea circular the revised fair life is 5 yearsonly. Suitable action for their replacement is to be initiatedat the earliest.

YES YES

48 STPS PH-III 400

220 V Dc battery source - 216 V DC battery source ofunit# 9 of 1200ah capacity - It was commissioned in theyear 2004. As per cea circular the revised fair life is 5 yearsonly. Suitable action for their replacement is to be initiatedat the earliest.

YES YES

ACCORDING TO CE(Engg.) JABALPURAS PER IEEE 450-1987,THE

RECOMMEND PRACTICE TO REPLACEBATTERY IS BASED ON C-10 TEST AND

NOT A TIME BOUND AND C-10 TESTFOUND SATISFACTORILY IN AUG-13 &

THE SAME WILL BE PERIODICALLYREPEATED IN AOH.

Page 5 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

49 STPS PH-III 400

220 V DC battery source - 216 V DC battery source forstation of 1200ah capacity - It was commissioned in theyear 2009. As per cea circular the revised fair life in 5years only.

YES YESITS C-10 TEST DONE AND RESULTFOUND SATISFACTORY.

50 STPS PH-III 400ISP Feeder - Reverse zone is not provided is rel 521 relay.The zone calculations may be revised.

YES NO DEC'16

REVERSE ZONE WILL BE PROVIDED INTHE NEW NUMERICAL RELAY WHICHIS PROCURED FOR MAIN 2PROTECTION .PURCHASE OF RELAYFOR MAIN-II IS IN TENDERINGSTAGE.HOWEVER PROPOSAL FORCALLING SERVICE ENGINEER FOR REL521 IS IN PROCESS.

51 STPS PH-III 400ISP Feeder - Over voltage protection has not been enabledin rel521 numerical relay.

YES YES.OVERVOLTAGE SEETING STAGE-1 &STAGE-II HAVE BEEN PROVIDEDTHROUGH SEPARATE RXEG-21

52 STPS PH-III 400Reactor - 63 MVARs bus reactor no. 1 is out since24.05.2005.

YES YES

53 STPS PH-III 400Reactor - new reactor is available. it should becommissioned early.

YES YES

54 STPS PH-III 400Fire protection of transformer - mulsifire type fireprotection system is out of order.

YES NO

TRAIL OF MULSIFIRE D,G SET TAKENSUCCESSFULLY.HWEVER POSSIBILITY

OF NITROGEN FIRE PROTECTIONSYSTEM IS BEING EXPLORED.

55 STPS PH-III 400Fire protection of transformer - suitable of nitrogeninjection fire protection system may be explored.

YES NO DEC'16 WAITING FOR RECEIPT OF OFFER

56 SSTPP 400

Carrier protection is enabled for 400 & 220 KV lines.A/Ris enabled dead time and reclaim time are taken as 700 ms& 15msec respectively.The same mar be reviewed as perCBIP guideline.According to which setting are to be 1 sec& 25 sec respectively.

YES NO DEC'16

DUE TO PROBLEM OF NONACCEPTANCE OF CHANGES IN SCADASOFTWARE.MATTER IS TAKEN WITHM/s ALSTOM AND ITS RESPONSEAWAITED.

57 SSTPP 400

Same over voltage stage-I setting is adopted for all 400 KVline.As per CBIP guide line clause no.4.3.1 of manualno.274.A time discrimination of 1sec is to be providebetween relays of different lines at an station.The mattermat be reviewed.

YES YES COMPLETED

BUS REACTOR-I SUCCESSFULLYCHARGED ON 29/12/2012.

Page 6 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

58 SSTPP 400

Over voltage stage-II setting for 400 KV line is adopted aspick up 140% time 1 sec.As per CBIP guide lines thesetting is to be taken as 150% & 0.1 sec.The setting may bereviewed.

YES YESSETTING ARE CHANGED ANDPRESENTLY EFFECTIVE.

59 SSTPP 400

Zone 3 setting for 400 KV SSTPP-Pithampur circuit 1&2is based on 100% of main line plus 100% of 400 KVPithampur-PGCIL indore line setting may be reviewed byconsidering another circuit of SSTPP-Pithsmpur as longestline.


60 SSTPP 200

Zone 3 setting for 200 KV SSTPP-Chhegaon line is basedon 100% of main line plus 100% of 220KV chhegaon-nimrani line It is reaching to next voltage line at chhegaonline. setting may be revied to restrict the reach.


61 TONS HPS 220 PLCC ROOM - Dead Rodents odor was felt. YES YES COMPLETED

62 TONS HPS 220220 KV Feeders - TMS of directional E/F is 0.1 second. Itappears very low and to be reviewed in reference to faultMVA of Tons HPS.

YES YES COMPLETED

63 TONS HPS 220

220 KV Feeders - Female contact of R & Y phases of bus-2isolator of 220 KV Rewa feeder-2 is not available. Hence,it is not possible to put on this bus in case of anyeventuality.

YES YES COMPLETED

64 TONS HPS 220RELAYS - Zone 3 time setting of 220 KV feeders is 600mili seconds and it may be 700 milli seconds as per newinstruction.

YES YES COMPLETED

65 TONS HPS 220 DG Set – Over current protection is out of service. YES NO DEC'16TENDER OPENED AND CASE IS UNDERPROCESS.

66 TONS HPS 22048 Volt DC System - Battery set is placed on the floorwithout putting insulator.

YES NO DEC'16PROCUREMENT OF BATTERY SETSHALL BE DONE UPTO 2015-16 .

67 TONS HPS 220PLCC ROOM - No PLCC cabinets for Rewa – 1, Rewa - 2& Kotar directions.

YES NO DEC'16

PROCUREMENT OF MATERIALINITIATED

Page 7 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

68 TONS HPS 220Communication - Communication to 220 KV Kotar s/s isnot available

YES NO DEC'16

69 TONS HPS 220Communication - Communication to 220 KV Rewa s/s isnot available

YES NO DEC'16

70 TONS HPS 220

Communication - Mode of communication with SLDC isvery poor which may be improved by providing Landlinephone in control room or by other suitable means. PLCCcommunication to Jabalpur is having much hauling.

YES NO DEC'16

71 TONS HPS 220RTU - Active power transducer of 220 KV Rewa feeder-2is found out.

YES YES COMPLETED

72 TONS HPS 220 RTU - Alternate data channel to SLDC is not available. YES NO DEC'16PROCUREMENT OF MATERIALINITIATED

73 TONS HPS 220220 KV Feeders - Carrier Protection & Auto re-closurefeature has not been commissioned YES NO DEC'16

TENDER OPENED AND CASE IS UNDERPROCESS.

74 TONS HPS 220220 KV Feeders - 220 KV feeders’ isolators with earthswitch are not in working order. YES NO OCT'16

MATERIAL RECEVIED AT SITE ANDWORK COMPLETED IN UPCOMINGAOH.

75 TONS HPS 220 Transformer - MOLG of all the GTs are not working. YES NO OCT'16 RECIFIED IN UPCOMING AOH

76 TONS HPS 220Station Transformer - 33 KV lightening arrestor founddisconnected.

YES NO DEC'16 RECIFIED IN UPCOMING AOH

77 TONS HPS 220

Generator Transformer - No mechanical tripping onexisting 220 KV Gas Circuit Breaker of generatortransformer and it is Single Pole Mechnism, it shall beGang operated circuit breaker.

YES NO DEC'16PROCUREMENT OF MATERIALINITIATED

78 TONS HPS 220Fire Protection – Generator fire protection is not inworking order.

YES NO DEC'16ORDER PLACED TO FIRM AND WORKSHALL BE COMPLETED SHORTLY.

PROCUREMENT OF MATERIALINITIATED

Page 8 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

79 TONS HPS 220Governor - Unit 1 & 2 are on manual mode of governoroperation.

YES YES COMPLETED

80 TONS HPS 220RELAYS - Generator Protection & transformer protectionis provided through electromechanical relays. It is to beprovided with numeric relays.

YES NO DEC'16TENDER OPENED AND CASE IS UNDERPROCESS.

81 TONS HPS 220RELAYS - The existing bus bar protection is un-commissioned and obsolete. It is to be provided throughNumeric relays.

YES YES

82 TONS HPS 220RELAYS - LBB protection is not commissioned on 220KV feeders. YES YES

83 TONS HPS 220RELAYS - Carrier protection is not available on all 220KV feeders.


84 TONS HPS 220RELAYS - 220 KV Bus coupler earth fault relay is out oforder


85 TONS HPS 220RELAYS - Some of the protection/ auxiliary relays are nothaving cover to prevent from dust, moisture and water etc.

YES YES COMPLETED

86 TONS HPS 220Earth Resistance – Earth Resistance record has notproduced for 220/33 KV switch yard & electronic earthingof DAVR.

YES NO OCT'16 DONE IN UPCOMING AOH

87 TONS HPS 220 GPS Time Synchronizer was not available. YES NO DEC'16

88 TONS HPS 220 Sequence Event Recorder was not available. YES NO DEC'16

89 TONS HPS 220 Disturbance Recorder was not available YES NO DEC'16

90 TONS HPS 220 Diagnostic Station was not available. YES NO DEC'16

TENDER OPENED AND CASE IS UNDERPROCESS.

COMPLETED

Page 9 of 10

MPPGCL




IF NOTATTEND,REASON





Sl.No.

Name ofSub-Station


S/S VoltagekV

91 TONS HPS 220The condition of emergency lighting at various floors andcontrol locations is poor.

YES YES COMPLETED

Page 10 of 10

MPPGCL protection audit statusState:- Madhya PradeshENTITY - MPPGCLQuarterly Report for the period of April 2016 to June 2016

ANNEXURE-III

PRESENT STATUS


IF NOTATTEND,REASON


IF NO, EXPECTEDDATE TOATTEND

1 BARGI HPS132 KV SUB-

STATIONDPR relay setting of the 132 KV Jabalpur 1, Jabalpur 2 and

Lakhnadon feeders to be reviewedYES YES COMPLETED


STATION

220 V DC system having positive earth fault and mixing of theDC source 1 and 2 is observed. Periodical load test of the

battery may be ensured.YES YES COMPLETED


STATIONThe 132 KV switchyard, Power House and equipment needs

more attention towards its up keeping.YES YES COMPLETED


STATIONRecords of the mock drill / trial of the fire fighting equipments

and DG set are not available at Bargi Power Station.YES YES COMPLETED


STATIONAll Existing Electomechanical / Electostatic Relays to be

replaced with numerical relays.YES NO Dec-17

Budgetary offer for replacing allelectromechanical relay with Numerical Relayfor supply with complete retrofitting job isbeing awaited.


STATION

Fire Fighting system with CO2 Cylinders are available at powerstation but it is observed that it is in the mannual mode. It

may be in the auto mode.YES NO Dec-17

The case of repairing and upgrading of CO2system is under process.


STATIONThe Facility of DR/ SER is not available at the HPS Bargi. YES NO Dec-17

The facility of DR/SER is provided in the offer ofM/s ABB for retrofitting of numerical relay panelwhich is in the process.


STATIONGPS Facilities is not available. YES NO Dec-16

Preparation of Technical specification is underprogress.


STATION

132 KV MOCB installed on 132 KV Jabalpur-1, Jabalpur-2,Lakhnadon, bus coupler bay and 20MVA transformer to be

replaced with SF6 Circuit Breaker.YES NO Dec-16

Drawing of SF6 Breaker is approved and M/sElectro services Vadodara supply the materialwithin 3 months.


STATIONLBB Relay not provided on the 132 KV Jabalpur-1, Jabalpur-2 ,

Lakhnadon Feeders.YES NO Dec-16

Provision for LBB relay on 132KV JBP-1, JBP-2,LKD feeders is being incorporated in freshprocurement case of numerical relays and shallbe commissioned in future.


STATION132 KV R phase CT of Bus Coupler (Bus-I) is not available. YES YES COMPLETED


STATIONBus Bar Protection is not in service. YES NO Dec-16

PROCUREMENT OF BUS BAR PROTECTION ISUNDER PROCESS AND AT PRESENT BUDGETARYOFFER IS ASKED FROM FIRM.

DEFICIENCIES THAT CAN BECORRECTED WITHOUT

PROCUREMENT (CATEGORY-A)

DEFICIENCIES INVOLVEINGPROCUREMENT (CATEGORY-B)

NAME OF UTILITY: MPPGCLFORMAT FOR PROTECTION AUDIT DEFICIENCIES/OBSERVATIONS COMPLIANCE

S.NO

NAME OF S/sIDENTIFIED FOR

PROTECTIONAUDIT

S/s VOLTAGEOBSERVATIONS OF PROTECTION AUDIT (DATE

AT WHICH PROTECTION AUDIT CONDUCTED i.e 22/04/13& 23/04/14.)

Page 1 of 1

MPPGCL protection audit status

State:- Madhya PradeshENTITY - MPPGCLQuarterly Report for the period of April 2016 to June 2016

ANNEXURE-II

PRESENT STATUS


IF NOTATTEND,REASON


IF NO, EXPECTEDDATE TO ATTEND

1GANDHISAGAR

HPSCarrier System is use for communication only, no carrier protection isprovided.

NA

2GANDHISAGAR

HPS

Positive side of 220 V DC sources - 1 is found earthed (Voltagebetween positive to earth is Zero and negative to earth is 240 V) Pointat which DC leakage / earthling have developed may be detected andrectified at the eariliest.

YES YES COMPLETED

3GANDHISAGAR

HPS220 V Battery charger - 2 and Battery set - 2 is very old and underreplacement.

YES YES COMPLETED

4GANDHISAGAR

HPSSynchronizing trolley is available and working properly. YES YES COMPLETED

5GANDHISAGAR

HPSCTs star point earthling of 132 KV are checked and found no multipleearthlings in the system.

YES YES COMPLETED

6GANDHISAGAR

HPS

Height of Live conductor in HV section from CB to wave trap in 132 KVManasa bay is seams to be very less. Sufficient Ground clearance maybe maintained for safety purpose.

YES YES COMPLETED

7GANDHISAGAR

HPS

Operation of DG set is available in manual mode. Provision for automode operation may be provided so that DG set starts automaticallyin black - cut condition/exigency.

YES NO JAN'17 NIT WLL BE ISSUED SHORTLY

8GANDHISAGAR

HPSAuto Check synchronizing facility is not available, which should beprovided for betterment of system.

YES NO JUNE'17BUDGETARY OFFER IS BEINGOBTAINED.

9GANDHISAGAR

HPSTesting of DPR, Differential and other Relays. Along withcorresponding CT & PT should be carried out in regular interval.

YES YES COMPLETED

10GANDHISAGAR

HPSDRs, SERs are not available for recording of system disturbances. YES NO AUG'17 OFFER ARE AWAITED

11GANDHISAGAR

HPSBack up O/c - E/F relays are not provided for all GeneratorTransformer. It should be provided at the earliest.

YES NO JUNE'17 OFFER ARE AWAITED

12GANDHISAGAR

HPS

Almost all the relays provided for Generator, Generator Transformer(GT), Station Transformer of 20 MVA are electromagnetic type. Theseexisting relay should be replaced with numerical relays for betterreliability, sensitivity, faster response and compatibility with GPSsystem.

YES NO AUG'16

TENDER FOR PROCUREMENT ANDCOMMISSIONING OF DISTANCEPROTECTION RELAY AND BACK-UPPROTECTION RELAY IS UNDEREVALUATION.

13GANDHISAGAR

HPS

Almost all relays (Distance protection, O/c, E/F relays) provided for132 KV Feeders are electromagnetic type and required to be replacedby numerical relay for better reliability, sensitivity, faster responseand comptibility with GPS system.

YES NO AUG'17BUDGETARY OFFER ARE CALLED FORESTIMATION BUT STILL AWAITED.

S.NO

NAME OF S/sIDENTIFIED FOR

PROTECTIONAUDIT

OBSERVATIONS OF PROTECTION AUDIT (DATE AT WHICHPROTECTION AUDIT CONDUCTED i.e 22/04/13 & 23/04/14.)

FORMAT FOR PROTECTION AUDIT DEFICIENCIES/OBSERVATIONS COMPLIANCENAME OF UTILITY: MPPGCL

DEFICIENCIES THAT CAN BE CORRECTEDWITHOUT PROCUREMENT (CATEGORY-A)

DEFICIENCIES INVOLVEING PROCUREMENT(CATEGORY-B)

Page 1 of 1

State:- Madhya PradeshENTITY - OMKARESHWAR POWER STATIONQuarterly Report for the period of April 2016 to June 2016

Yes NoPA

conductedon date

if not done,Target Date

for PAYes No Total

CategoryA

CategoryB

TotalCategory

ACategory

BTotal

CategoryA

CategoryB

1 OmkareshwarPower Station 220 Yes Yes 5 5 4 1

No. of Deficiencies attendedNo. of Deficiencies not yet

attendedIf identified for PA

Annexure - A.2.2

Protection Audit

Name of the utility:Omkareshwar Power Station FY:16-17

Whetheridentified for PA

in this FY

Deficienciesobserved

No. of Deficiencies

Sr.No.

Name of the S/s KV

State:- Madhya PradeshENTITY - OMKARESHWAR POWER STATIONQuarterly Report for the period of April 2016 to June 2016

Remarks

Yes/NoWhetherattendedYes/No

If notattendedreason


If noexpecteddate toattend

130 OmkareshwarPower Station 220 Auto reclosing of all the 220KV Lines are

disabled

M/s Voith Hydro & M/s ABB Ltd. hasintimated that our system is not designed forauto reclosing operation due to generatorconstant.

131 OmkareshwarPower Station 220

Only Stage-1 overvoltage protection (110%-5sec) is only provided, however whereas twostages of overvoltage protection isrecommended by CBIP

The report of CPRI,i.e. third party has beenreceived and all settings of CPRI shall bereviewed in consultation with MPPTCL.


Line protection Main -1 & Main-2 are havingdistance protection.In such cases CBIPrecommends for additional directional IDMTEarth Fault Relay

Yes

The Definite type of Directional Earth faultprotection function is configured in the relayREL 511 and is in service.However,the casefor replacement of existing REL316 relay intoREL670 or equivalent is in progress.


Generator Protection back up ImpedanceProtection is provided with time delay of 3sec, whereas,it is recommended the samemay be 2 sec maximum

Complied

134 OmkareshwarPower Station 220 Most of the protection relays needed to be

tested regularly Complied

Updated status of rectification work of deficiencies under category A & B of Omkareshwar power Station

Sr.No.

Name ofSubstation


S/SVoltage in

KVObservation of the Protection Audit




Name of Utility: JP Bina Report for the period of April 2016 -June 2016


If notattended,re

asonYes/No


If notattended,

reason

1)UAT 1&2 for unit 1 still notcommissioned Yes Yes NA NA NA NA

All the UAT of Unit 1&2 have beencommissioned (Complied)

2) GPS system notcommissioned Yes Yes NA NA NA NA

GPS system of whole station commissioned(Complied)

3) 2no. Of High Mast towerinstalled near 400KV transferbus in the switchyard

No YES NA NA NA NA

Both the high mast has been shifted to outside corners of the Switchyard( Complied)

4)DR&ER is provided in SCADAsystem. Yes yes NA NA NA NA

It is available in our SCADA system(Complied)

5)Battery cell voltage need tobe recorded with respectivecharger in OFF condition. Yes yes NA NA NA NA

Battery cell voltage is now being recordedrespective to charger in off condition.(Complied)

6)Directinal E/F relay setting 1sec. for PGCIL 1.2 Sec.forMPPTCL line is provided .This ison higher side,to be reviewed&revise Yes

Commentsfrom ourconsultantM/S TCE isgiven NA NA NA NA

Answer from our consultant M/S TCE :Directional e/f is provided to protect thesystem from high impedance line faults wherefault currents are low. So 1 sec operating timeis sufficient and can be used for both the lines.Decrease in the operating time may cause itto interfere with 3rd zone time settings.(Setting is in order. Hence complied)

7)Over voltage setting for 400kvPGCIL&MPPTCL line are not asper CBIP recomendetion(CBIPREV 274).

Yes

Commentsfrom ourconsultantM/S TCE isgiven NA NA NA NA

Our consultant TCE's reply :Please note thatan instantaneous overvoltage setting of 130%phase to phase can be used. As per standardpractice lines are capable of withstanding150% of highest system voltage at powerfrequency for 1 minute. So above settings areok. (Setting is in order. Hencecomplied)

Jaypee BinaThermal Power

Plant400 KV

SLDC,Jabalpur

14/02/2013-15/02/2013

FORMAT FOR PROTECTION AUDIT DIFFICIENCIES/OBSERVATIONS COMPLIANCE

Deficiencies that can be correctedwithout procurement(Category-A)

Deficiencies involvingprocurement(Category-B)Name of S/S

identified forprotection Audit

S/Svoltage

Name ofThird partyProtection

Audit agency

RemarkDate on

which auditconducted

Observation of protectionAudit

Page 1 / 2

Name of Utility: JP Bina Report for the period of April 2016 -June 2016


If notattended,re

asonYes/No


If notattended,

reason

FORMAT FOR PROTECTION AUDIT DIFFICIENCIES/OBSERVATIONS COMPLIANCE

Deficiencies that can be correctedwithout procurement(Category-A)

Deficiencies involvingprocurement(Category-B)Name of S/S

identified forprotection Audit

S/Svoltage

Name ofThird partyProtection

Audit agency

RemarkDate on

which auditconducted

Observation of protectionAudit

8)GT&ST fifth harmonicsblocking is done for 20%. Thismay be studies & revised.

Yes

Commentsfrom ourconsultantM/S TCE isgiven

NA NA NA NA

Reply from consultant TCE ;As perrecommendation from relay manuals, settingof 15 to 30 % is used for fifth harmonicblocking. As per our standard 20% is used fifthharmonic blocking. (Setting is in order.Hence complied)

9)It is observed that forganretor protection underfrequency relay trip setting48.5Hz for 5sec.& overfrequency relay trip setting51.0Hz for 5sec. Is taken,thesame may be reviewed.

Yes


NA NA NA NA

OUR consultant reply Frequency protectionis used mainly for alarm and as per ourpractice a time delay of 5 sec is adequate.(Setting is in order. Hence complied)

10)In turn protection has notbeen provided,through it isrecommended forGeneratormore than 100 MVA. Yes


NA NA NA NA

Our consultant TCE's reply ;As per ourstandard practice, inter-turn protection isprovided only when specifically recommendedby the manufacturer. (It is in order.Hence complied)

11)Periodical testing of relays &yard equipment must be done. Yes NA NA NA

Periodical testing of relay & yard equipmentshas been done .

Jaypee BinaThermal Power

Plant400 KV

SLDC,Jabalpur

14/02/2013-15/02/2013

Page 2 / 2

Name of Utility - MADHYA PRADESH POWER TRANSMISSION CO. LTD .JABALPUR (As on quarter ending June 2016 ) Annx-I

Yes/NoWether

attendedYes/No

if not attendedreason

Yes/NoWether attended

Yes/Noif no, expected date

to attend

1. Time synchronisation problem ofprotective relays with GPS.

Yes Yes - Yes No - 2 nos ABB make relays have to beequiiped with IRIG-B port

2. Providing of Separate Event Logger No Yes* - Yes No*As event logging facility provided inall DPR's& Differential relays it is notrequired

3. Providing of adequate fire protectionsystem. No Yes - No No

Nitrogen injection fire protectionsystem provided in all threeTransformers.

4. Replacement of 220KV Static Bus Barsystem with Numeric No No - Yes Yes - Completed

5. Providing of additional Backup elementon 315MVA Transformer -III

No No - Yes Yes - Completed

1. Replacement of 1No 132KV NGEF SF6CB of BHEL Bay

Yes Yes - Yes Yes - Completed

2. Replacement of ElectromechanicalO/C & E/F relays of Incomers withnumerical relays.

No No - Yes Yes - 3 nos Numerical O/c + E/f relaysrequired

3. Provision for taking REF protection inCircuit on 160MVA, 3x40MVA and100MVA Transformers

Yes Yes - Yes No -

REF is enabled on 160 MVA CGLXmer and 100 MVA Xmer For 160MVA BHEL Xmer, NCT is required.For 3X40 MVA Xmer, NCT andstructure is required.

4. Providing of Additional wave trap on220KV Inter Connector-II No No - Yes Yes - -

1. LBB scheme to be taken in service Yes Yes - No No - Completed

2. Providing of 220KV Bus Bar Protection Scheme Yes yes - Yes Yes - Completed

3. LAs leakage Current measurement to be done Yes Yes - No No - Completed

1. Replacement of Static/Electromechanical DPRby Numerical relays

Yes Yes - No No -

2 Commissioning of new 600AH 48V BatteryCharger

Yes Yes - No No -

3 Synchronisation of GPS system with protectionof 132KV Traction-I & II feeders

Yes Yes - No No -

State:- Madhya Pradesh

Sl. No.

Name ofSub-Station


S/SVoltage

Name of ProtectionAudit Agency

Date ofwhich AuditConducted

Observation of Protection Audit

Deficiencies that can be correctedwithout procurement

(Category-A)


Remark

ENTITY - MPPTCL

Quarterly Report for the period of April-2016 to June-2016

1 400KV S/SBhopal 400KV

InternalProtection Auditparty compirisingof representatives

of State Utilityand Power Grid

17-01-13to 18-01-

13

2 220KV S/SBhopal 220KV

InternalProtection Auditparty compirisingof representatives

of State Utilityand Power Grid

22-04-13to 23-04-

13

3220KV S/S

Mandideep220KV

Internal ProtectionAudit party

compirising ofrepresentatives ofState Utility and

Power Grid

26-04-13 to27-04-13

4220KV S/S

Mandideep220KV



Power Grid

07-05-13 to08-05-13

Page 1 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. 33KV, 25MVAr reactor of 315MVA Tr-I to betaken back in service by replacement of R phase33KV Bushing and repair of 33KV CB.

YES Yes - YES YES - -

2 Oil leakage from B phase Turret of 400KVBushing of 315MVA No-I

Yes Yes - No No - ATTENDED IN THE MONTH OF JUNE 2013

3. 33KV, 25MVAr reactor of 315MVA Tr-II to betaken back in service by replacement of R phase33KV Bushing and repair of 33KV CB.

Yes YES - No No -AFTER REPLACEMENT OF R-PHASE BUSHINGand repair of 33KV CB.REACTOR HASALREADY BEEN TAKEN IN SERVICE

4. Mixing of 220V DC source-I & II to be rectified Yes Yes - No No - DC SOURCE SEPARATED

5. Replacement of B phase CVT of 400KV Main Bus-II

Yes Yes - No No -REPLACEMENT DONE IN THE MONTH OFMARCH 2013

6. Auto Check synchronising facility is not inservice No NO - No No -

SYN. TROLLY IS AVAILABLE AND IT WILL BETAKEN IN SERVICE AFTER CHECKING THEHEALTHINESS OF THE RELAY AND ITS WIRING

7. Extending GPS connectivity to balance DPRsand Differential relays

Yes Yes - No No - -

8. Providing of Separate Event Logger Yes yes - YES YES - Event logging facility commissioned in SCADA

9. Connecting 220KV Bus Bar Panel for tripping Yes Yes - No No - TRIPPING CONNECTED ( 28 MAY 2013)

10 Testing of DPR of 220KV Interconnector-II Yes Yes - No No - TESTED1 Providing of Emergency light in Control andBattery Room

No Yes - No No -

2 Providing GPS connectivity in 400KVControlpanels

Yes Yes - No No -

3. DG set not provided Yes yes - YES YES - Completed4. 400KV Bus Bar protection out of service Yes Yes - No No -5 High resistance of Earth pit of 220KV PGCIL-IIbay

Yes Yes - No No -

6. 220KV side LBB to be commissioned Yes Yes - No No -7 Directional E/F feature to be enabled on220KV Birsinghpur and Damoh feeder.

Yes Yes - No No -

8. REF protection on 160MVA TELK Tr. To beenabled

Yes Yes - No No -

1. Zone-III setting of 220KV Gwalior-Bina-I & II tobe reviewed No Yes - No No -

2 Extending GPS time synchrinising facility to allpanels No Yes - No No -

3 220KV Bus Bar scheme to be provided No No - YES YES -New Numeric scheme commissioned in placeof old static scheme

4. Providing of NIFPS on 3x40MVA 220/132KVTransformer

Yes No - YES NO -Matter is under consideration ,however forsingle phase units scheme is not feasible.

5. Providing of DG set Yes No - YES Yes DG set received. Commissioning work underprogress

5 400KV S/S Bina 400KV



Power Grid

12-02-13 to13-02-13

6 400KV S/S Katni 400KV



Power Grid

17-01-13 to18-01-13

7 220KV S/S Gwalior 220KV



Power Grid

27-04-13 to28-04-13

Page 2 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. Relay setting of 132KV Malanpur-Banmore-Ifeeder to be reviewed No Yes - No No -

2. Zone-III setting of 220KV Malanpur-Auraiyafeeder to be reviewed

Yes Yes - No No -

3. Providing of DG set Yes No - YES No DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

4. DC leakage in 110V DC system to be removed Yes Yes - No No -

5. GPS time synchronising to be extended toTransformer panels

Yes Yes - No No -

6. Providing of NIFPS on 160MVA 220/132KVTransformer-II

Yes No - YES NO - Procurement approval is in process

7. 220KV Bus Bar protection to be taken intocircuit for tripping

Yes Yes - No No -

8 Earth resistance of 20 and 40MVA transformerpits are not taken

Yes Yes - No No -

1. SSRR3V scheme on 132KV Bhind feeder to bereplaced Yes Yes - Yes Yes -

2. 220KV and 132KV feeder DPRs Zone-II & IIIsettings to be reviewed

Yes Yes - No No -

3. DC leakage in 110V DC system to be removed Yes Yes - No No -

4. GPS time synchronising facility to be extendedto 132KV Bhind,Seondha feeder and 160MVA BBLTransformer panels

Yes Yes - No No -

5. Providing of NIFPS on 160MVA 220/132KVTransformer-II No No - YES NO - Procurement approval is in process

6. 220KV Bus Bar protection scheme to be takeninto circuit after configuration of new 160MVABBL transformer

Yes Yes - No No -

1. 220KV Bus Bar scheme to be provided Yes Yes - Yes Yes - comissioned on dt.09/02/152. 160MVA TransformerI & II panels aresynchronised with GPS system, other panelsneeds to be synchronised

Yes Yes - No No - --

3. Oil temp. indicator is not available in 20MVATransformer

Yes Yes - No No - --

4 Earth resistance meaurement to be done Yes Yes -- No No - --5. Zone-II & III settings of DPRs of 220KVPGCIL,132KV Arniya feeders to be checked

Yes Yes -- No No - --

1. CT junction Box earthing in 132KV Bays to bestrengthen

Yes Yes -- No No -

2. 220KV and 132KV CB Marshalling Box earthingto be checked and strengthen

Yes Yes -- No No -

3 IOC feature in Differential and DPR relays to beenabled from reliability point of view

Yes Yes -- No No -

4. Over fluxing alarm and Trip time settings maybe verified and corrected

Yes Yes -- No No -

8220KV S/SMalanpur

220KV



Power Grid

01-05-13 to02-05-13

9220KV S/SMehgaon

220KV



Power Grid

29-04-13 to30-04-13

10220KV S/SShujalpur

220KV



Power Grid

24-04-13 to25-04-13

11220KV S/S

Hoshangabad220KV



Power Grid

08-05-13 to09-05-13

Page 3 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. AREVA make 220KV CB marshalling Boxes arenot properly earthed

Yes Yes -- No No -

2. Minor DC leakage found in 110V DC source-II Yes Yes -- No No -

3. Five nos DPRs (220KV Handiya-I&II,Barwaha,Sarni-Iii and Transfer B/C) are not timesynchronised with GPS

Yes Yes -- No No -

4. Auto reclosed feature is to be madeoperational

Yes Yes -- No No -

5. LBB and Bus Bar protection scheme have to betaken in to circuit

Yes Yes -- No No -

6. H.Set feature of Differential relays to beenabled

Yes Yes -- No No -

1. GPS is installed but not functioning, to betaken into service

No No -- YES No - Procurement involved

2. 220KV Bus Bar protection scheme is ASEAmake needs to be replaced with numericalscheme

No No -- YES YES - New GE make BB scheme commissioned (date ofservice 15.09.2014)

3. Providing of DG set Yes Yes -- YES Yes - Completed4 Numeric DPR on 220KV Jetpura feeder to beprovided

Yes Yes -- No No -

5 DTOC setting of Transformers may be reviewedwith latest fault level and CT ratio

Yes Yes -- No No -

1. GPS is installed but intermittent outage of GPShas been reported, needs to be discussed withmanufacturer

Yes Yes -- No No -

2. Uniformity in settingds of both 160MVAtransformers may be reviewed

Yes Yes -- No No -

3. Rajgarh-II DPR relay setting to be reviewed forPhase/Ground Impedance for Zone-III

Yes Yes -- No No -

4. Providing of DG set Yes No - YES Yes - DG Set Received. Commissioning under Progress

5 V/F protection in any of Differential relay on132/33KV Transformers not enabled

Yes Yes - No No -

1. Some numerical relays are not timesynchronised with GPS

Yes Yes - No No -

2. 220KV Bus Bar protection scheme is ASEAmake needs to be replaced with numericalscheme

No No - YES YES -

3. V/F setting for 3x40MVA, 63MVA ,40MVA isnot enabled

Yes Yes - No No -

4. REF is not enabled in 220KV and 132KVTransformers, to be enabled

Yes Yes - No No -

5 LBB protection for 220KV Class Transformers tobe commissioned

Yes Yes - No No -

6. Providing of DG set Yes Yes - YES YES - Completed

12 220KV S/S Itarsi 220KV



Power Grid

06-05-13 to07-05-13

13220KV S/S South

Zone Indore220KV



Power Grid

22-04-13 to23-04-13

14220KV S/SPithampur

220KV



Power Grid

24-04-13 to25-04-13

152220KV S/S

Barwaha220KV



Power Grid

26-04-13 to27-04-13

Page 4 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. GPS system for relay time synchrinisation is outof order

Yes Yes - No No -

2. Automatic Fire Protection System( NIFPS) tobe installed on all Transformers

Yes Yes - No No -Matter is under consideration ,however forsingle phase units scheme is not feasible.

3. Fire extinguishers are available but to be placedat appropriate locations as per requirement.

Yes Yes - No No -

4. Air Conditioning system should be provided inthe Control Room

Yes No - YES NO - Matter is under consideration.

1 Bus Bar protection system is provided but is inalarm mode only.

Yes Yes - No No -

2. 110V DC System is having earth leakageproblem

Yes Yes - No No -

3. Automatic Fire Protection System (NIFPS)to beinstalled on all Transformers


4. Synchronising scheme must be provided asmany Hydel Generators are connected to the220KV and 132KV Bus.

Yes No - YES NO - NIT issueed & in process

5. Lighting Visibility in the Control Room shouldbe increased

Yes Yes - No No -

6. Fire extinguishers are available but to be placedat appropriate locations as per requirement.

Yes Yes - No No -

7. REF feature in 160MVA CGL is not enabled. Yes Yes - No No -

8. Load dropping scheme on Transformers mustbe connected.

Yes Yes - No No -

1. GPS system is available but the relays are notconnected to it.

Yes Yes - No No - -

2 Bus Bar and LBB protection of B-90 Bus Barprotection scheme is not in service due to Y phaseCT module defect.

Yes Yes - No No - Put back in service

3 Earth leakage problem in 110V DC system isthere.

Yes Yes - No No - -

4. REF feature in 160MVA BHEL is not enabled. No No - Yes No - NCT Required

5. Automatic Fire Protection System( NIFPS) tobe installed on 160MVA AREVA Transformer

Yes No - Yes No - Procurement approval is in process

6. REF protection is not available on 160MVABHEL transformer

Yes No - Yes No - NCT Required

1. Oil leakage observed from 33KV TertiaryBushing Turret of BHEL Transformer

Yes Yes - No No -

2. Fire extinguishers are not available at ControlRoom

Yes Yes - No No -

3 Providing of Emergency light in Control room Yes Yes - No No -

4 Internal panel cabeling/Wiring of Controlpanel is meshed

Yes Yes - No No -

16 220KV S/S Jabalpur 220KV



Power Grid

24-04-13 to25-04-13

17 220KV S/S Rewa 220KV



Power Grid

29-04-13 to30-04-13

18 220KV S/S Satna 220KV



Power Grid

01-05-13 to02-05-13

19 220KV S/S Damoh 220KV



Power Grid

06-05-13 to07-05-13

Page 5 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. GPS system is not connected with all relays Yes Yes - Yes Yes -

ABB MAKE NUMERICAL RELAY DOES NOTHAVE PORT FOR SYNCHRONIZATION WITHGPS SYSTEM. MATTER IS DISCUSSED WITHM/S ABB. FOR ENABLING FEATUREREQUIRED ADDITIONAL PORT ONCHARGEABLE BASIS WHICH IS IN PROCESS.

2. 48V Battery Charger is working in only Boostmode.

YES Yes - No No - Float mode is also taken in service

3. Automatic Fire Protection System (NIFPS)to beinstalled on both Transformers


4. 220KV Bus Bar scheme to be provided Yes YES - NO NO -

21 220KV S/S Barod 220KV



Power Grid

24-04-13 to25-04-13

1. GPS system is available but some relays arenot connected to it.

Yes Yes - NO NO - All relays connected


Yes Yes - NO NO - All relays connected

2. 220KV Bus Bar scheme to be provided Yes Yes - YES YES - commissioned3 V/F protection in any of Differential relay on132/33KV Transformers not enabled

Yes Yes - NO NO -

4 DTOC setting of Transformers may be reviewedwith latest fault level and CT ratio

Yes Yes - NO NO - corrected

5. Float mode of 110V DC Charger is defective Yes Yes - NO NO - Float mode is also taken in service

6 In 220KV Julwaniya-Omkareshwar, Zone-IIItime setting is 800ms.It is not programmable aspush buttons are not working and relaycommunication software is not available. It maybe rectified soon.

Yes Yes - NO NO - corrected


Yes Yes - No No - All relays connected

2. 220KV Bus Bar scheme to be provided Yes Yes - YES Yes _ New scheme commissioned

3. Float mode of 110V DC Charger is defective Yes Yes - No No - Float mode is also taken in service

24220KV S/S Indore-II

Jetpura220KV



Power Grid

08-05-13 to09-05-13

1. Time synchronisation system is available withGPS, Its connectivity was made with all 220KVDPR/Differential relays. As this has createdproblem in functioning of DPR/Differential ralays,time synchronisation system is disconnected.Rectification of the problem and connectivity oftime synchronisation system with all the relays isto be done.

Yes Yes - No No - Problem rectified &all relays connected.

25 220KV S/S Ujjain 220KV



Power Grid

26-04-13 to27-04-13

1. Time synchronisation system is available withGPS system, its connectivity is made with few220KV & 132KV relays, Connectivity for the rest ofthe system is to be done.


20 220KV S/S Sagar 220KV



Power Grid

09-05-13 to10-05-13

22220KV S/SJulwaniya

220KV



Power Grid

08-05-13 to09-05-13

23 220KV S/S Nimrani 220KV



06-05-13 to07-05-13

Page 6 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. Time synchronisation system is available withGPS system, its connectivity is made with all220KV & 132KV DPR/Differential relays. Itsconnectivity with Bus Bar Relay B-90 is to be done.

Yes Yes - No No - Done

2. CT sec. core meant for back up protection isalso used for Bus Bar protection for number of220KV bays.For Bus Bar protection scheme PSclass of CT Sec core is to be used.

Yes Yes - No No -

1. 220KV DC system voltage have been checkedw.r.t. (+ Ve) to earth=136V, (-Ve) to Earth=89V,and to be rectified

Yes Yes - No No - Rectified

2. 220V DC Source I & II mixing possibility is thereand to be checked.

Yes Yes - No No - Checked no DC source mixing

3. Float charger of 220V systemis not working inboth chargers and presently chargers are workingin Boost charging mode.

Yes Yes - No No -Float mode is made operational in both thechargers

4. Illumination in AC/DC room is very poor andsame to be rectified

Yes Yes - No No -

5. All 400KV and 220KV line relays are numericalexcept Main-Irelay of 400KV Nagda-Indore, whichhas been installed and has to be connected.

Yes Yes - No No - Taken in service

6. Separate event logger for S/S is not availableand needs to be provided.

Yes Yes - YES Yes - Event logging facility commissioned in SCADA

7. Directional E/F features is to be enabled onfollowing feeders,400KV Main-II Relay (GE D60),400KV ISP Main-II (ABB REL 521) and 400KVRajgarh I & II ( Alstom make EPAC 3000relay is tobe replaced by SEL 311C relay and feature has tobe enabled soon)

Yes Yes - No No -

8. 25MVAr 33KV Reactors installed on Tertiarywinding of ICT-II and ICT-IIIre out of order sincelong time.


26 220KV S/S Ratlam 220KV



Power Grid

06-05-13 to07-05-13

27 400KV S/S Nagda 400KV



Power Grid

17-01-13 to18-01-13

Page 7 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1. Tertiary Reactor of 315MVA Tr-I & II are notbeing taken in service due to high Tan deltavalues of Bushings, which should be replaced andreactors should be taken in to service.

Yes No - YES NOUnder Process HOWEVER 315MVA Tr-I ISTAKEN OUT OF SERVICE PERMANENTLY.

2 On 400KV side Bus Bar relay make EE type FACis electromagnetic type relay and it is very oldand obsolete. Its spares are not available,Thisscheme may be replaced with the numerical BusBar protection scheme.

Yes Yes - YES YES -New GE make BB scheme commissioned(date of service 03.11.2014)

3. REF protection of 315MVA EMCO Tr-IV is keptunder observation , which may be taken in toservice.


4 220V DC Charger make Statecon iscommissioned but not taken into service due tosome problem. It should be rectified and takeninto service.


5. Additional DC distribution Board is availableshould be taken into service to separate the DCdistribution to individual feeders.


6 GPS time synchronisation system is available ,Relays of 315MVA Transformers I,II & III areconnected. All the relays of other feeders andTransformers are to be connected.


7. Tripping/Closing time of 400KV Itarsi-I & II andAsoj-I & II CBs are not recorded.Same may becollected from PGCIL and update the record.

Yes Yes - No No - RECORDED

8. Zone-III reach setting of 400KV Asoj-I & iifeeders are given as 120% of protected line (31.23Ohm, Sec. value) Which is inadequate as backupzone protection. The time delay setting for Zone-III is given as 1000mSec.in all PGCIL feeders.Samemay be reviewed in accordance with the CBIPguidelines and uniformity of settings adopted.

Yes Yes - No No -

9. No DC leakage observed, but mixing of Dcsource-I & II dected.It should be rectified.

Yes Yes - No No - Rectified

1. The GPS system not available . No No - YES NO - under process

2. The autoreclosure scheme for 220 KVPipariya and 220 KV Narsingpur has to becommissioned.

No No - YES NO - under process

3. Metaling of yard is not done. No No - YES NO - under process

28 400KV S/S Indore 400KV



Power Grid

17-01-13 to18-01-13

Cont…28

400KV S/S Indore 400KV



Power Grid

17-01-13 to18-01-13

1 Chichli 220

Team of engineersfrom various

entities constitutedby SLDC

13.03.15

Page 8 of 26

Yes/NoWether

attendedYes/No




to attend

Sl. No.

Name ofSub-Station


S/SVoltage





(Category-A)


Remark

1.The220V 300AH (make:Exide,DOC:03-10-2007) battery set & battery charger havecompleted their useful life & needs to bereplaced.

Yes No - Yes No - Battery set received and commissioned

2. The C&R panel of 220KV JBP 1,2 are needto be replaced by integrated simplex panels orthe existing back up Electromechnical relaysshould be replaced by numerical relays.

Yes No - Yes No - under process

3. The work of 220KV Main bus -II is underprogress and would be commisioned verysoon.

Yes Yes - No No -

4. The GPS system sands make is available &found out of service due to ongoing civil worksin the substation.

Yes Yes - No No -

1. Electromechnical and electrostatic back upO/C & E/F relay of 220 KV JBP 1 & 2 feederand 160 MVA BHEL & CGL Xmer to bereplaced by numerical back up O/C & E/Frelay

Yes Yes - YES Yes - Tender is under process of finalisation

2. 220 KV Main bus -II is not availble. No No - YES NO -Since beginning this substation isconstructed with approved layout of1M+1A

3. The GPS system sands make is availableand connected except 220 KV JBP 1 & 2feeder.

Yes YES - No No - GPS connected

1. Fire protection system is not available in220/132/33 KV, 160 MVA Transformer No. I(Make – Areva)

Yes No - Yes No - Procurement approval is in process

2. LBB & Bus Bar protection scheme notcommissioned. However control panel for thescheme is available

Yes Yes - No No - Scheme commissioned

3. Auto reclosure not in service for 220 KVChichli & 220 KV Narsinghpur feeders & notcommissioned for 220 KV Itarsi feeder No. I &II.

Yes Yes - No No - Commissioned

4. DC Earth leakage is observed in 110 V DCsystem. –Ve bus is earthed Yes Yes - No No - earth leakage attended

5. GPS system of Sands make is available,but not connected in 220 KV Chichli, 220 KVNarsinghpur & 220/132/33 KV 160 MVAtransformer No. II. (Port is available on relaybut cabling is to be done.)

Yes Yes - No No - GPS connected

6. Load dropping scheme is not available Yes Yes - No No - To be connected shortly

7. Metalling in yard of 160 MVA, BHEL Maketransformer No. II is not available / to be done No No - Yes No - Retendering of work is being done

8. Time delay settings & reach settings ofzone 2, zone 3 & zone 4 in 220 KV feeders areto be reviewed and corrective measures are tobe taken.

YES Yes - No No - Setting revised

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1. Event sequence recorder is not available. Yes Yes - YES NO Event logging facility commissioned in SCADA

2.time synchronization and GPS facilitiesavailable but not in working condition YES NO - No No - MATTER IS under correspondance with firm.

3.synchronizing trolley not available. NO No - YES NO NIT issueed & in process4.220 kv Bus bar protection is connected inalarm mode only complete protection is yet tobe taken in service.

Yes Yes - No No - BUS BAR PROTECTION TAKEN INTO SERVICE

5. In Bina II circuit Auto reclosing facility is notin service due to defect in numerical relay. No NO - YES YES - -

6.220 kv Bus - Tie circuit breaker is notworking . No No - YES YES -

7.Numerical Relay is not available in 220 kvBus Coupler. No No - YES YES -

8. Zone -4 protection in all Distance protectionRelay are not commissioned. YES YES - No No -

9.Load Drop scheme are not available . YES YES - No No - -

10.REF protection is not available in both the220 kv transformer. No NO - YES No -

FEASIBILITY FOR REF PROTECTION TO BECHECKED

1 Event sequence recorder is not available. Yes No _ Yes No - Event logging facility commissioned in SCADA

2.Time synchronization and GPS facilities isnot available. No No _ Yes No - In process of procurement

3.synchronizing trolley is not available. No Yes _ No No _ NIT issueed & in process4.220 kv Bus bar protection is available butnot commissioned. No No _ Yes Yes _ Bus Bar Scheme commissioned

5.220 kv Bina PGCIL circuit breaker (telkmake)is out of service. No No _ Yes Yes _ New CB commissioned

6. 132kv capacitor bank circuit breaker is outof service. Yes Yes _ No No _

7.In 110 DC system ,earth leakage isobserved. The same needs to be rectified. Yes Yes _ No No _ _

1. Event sequence recorder is not available. No No - Yes No - Event logging facility commissioned in SCADA

2.Time synchronization and GPS facilities isavailable.Connected in 220 kv Shivpuri -1 andShivpuri-II .Need to be connected with inbalance feeders.

Yes Yes - No No -

3.synchronizing trolley not available. Yes No - Yes No - NIT issueed & in process4.In 110 V DC Source-II ,earth leakage isobserved. The same needs to be rectified. Yes Yes - No No -

5.220 kv Bus Coupler DPR relay (GE,D60)Found defective. Yes Yes - No No - DPR Relay replaced on date - 22.06.15

6.110V DC supply is looped from 160MVAtransformer C & R panel.separate DC supplyneed to be provided from DC distributionpannel.

Yes Yes - No No - Separate DC supply provided from DCdistribution panel

7. 160 MVA (AREVA MAKE)transformer,windiging Temperature indicator found faulty. Yes Yes - No No - -

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1) 160 MVA AREVA 5th harmonic setting is 25% to be revised to 40 %. Second harmonic torevised to 15 %.

Yes Yes - No No -

2) 132 KV Khachrod feeder length is 15 KM inDPR MHO setting is selected to be revised toQUAD for PH-G Zone-I.

Yes Yes - No No -

3) 132 KV Mahidpur feeder E/F TLS setting is0.15 to be revised to 0.25. Yes Yes - No No -

4) LBB of 160 MVA CGL make xmer on 132KV side are not in service . Yes Yes - YES YES - -

5) GPS is provided but not connected torelays. Yes No - YES NO - GPS being procured

6) Load dropping scheme is not provided on160 MVA Xmers. Yes Yes - No No - -

1. Relay setting calculation of 220 KV DamohLine and 132 KV Feeders of S/S has beenchecked and found that Zone-3 setting of 220KV Damoh line is on higher side, the samemay be reviewed as per recommendation ofCBIP.

Yes Yes - No No -

2. Auto-reclosing Scheme has not beenprovided in 220 KV Damoh Line. The samemay be provided as per recommendation ofCBIP.

Yes Yes - No No -

3. Carrier Protection of Permissive UnderReach (PUP) are provided for 220 KV DamohLine

Yes Yes - No No -

4. One DC source for 110V & 48V each isprovided in 220 KV sub station. Healthinessand earth leakage has been checked andfound in good condition. However, battery setis found very old and required for replacement.Year of manufacturing and year of installationof battery set is mentioned as under

-

Description: 110 Volt Battery No No - Yes No - Battery receivedDate of Mfg : NA -Date of commissioning : 15.08.2006 -Description: 48 Volt Battery No No - Yes No - In processDate of Mfg : 2002 -Date of commissioning : 15.08.2006 -

5. GPS is available and time Synchronizationof 160 MVA Xmer-2 is not commissioned. No Yes - No No -

6. DR’s facility is inbuilt feature of numericalrelay provided for Damoh Feeder & Buscoupler and 160 MVA Xmers.

Yes Yes - No No -

7. Synchronizing trolley is not available Yes No - Yes No - NIT issueed & in process

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8. Features to be disabled in numerical relayare not found during checking Yes Yes - No No -

9. Bus bar protection scheme of 220 KV isfound out of circuit due to defective module.The same may be put under service at theearliest. Time Synchronization may also beprovided with GPS. Further, B Phase PotentialTransformer (PT) of 220 KV Main Bus -2 is notavailable. Due to this reason, Main Bus -2 cannot be charged during any emergency. So thatabove PT may be installed at the earliest.

Yes Yes - No No -

10. Load drop scheme is not available Yes Yes - No No - In process

1. Testing of DPR for 220 KV lines is carriedout in yr.2007.Relay testing is required. Yes Yes - No No - -

2. GPS System of SANDS make is availablewith 02 nos of spliters, each for 10 Nos relays.It has developed some defect and matter isunder correspondence with the firm.

Yes Yes - No No __ __

3. Synchronization trolley is not available NO NO - Yes No __ NIT issueed & in process4.Load dropping scheme for x-mer is notavailable. Yes Yes - NO NO - __

5. DG Set is not available at the S/s. Yes No - Yes No __ DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

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1. Auto-reclosing is provided in 220 KV SatnaLine. However, setting of single phase DeadTime is found 0.7 S in place of 1Sec as perrecommendation of CBIP. Setting of the samemay be reviewed accordingly

Yes Yes - No No -

2. Carrier Protection of Permissive UnderReach & Directional Earth Fault (PUP & DEF)are provided for 220 KV Satna Line.

Yes Yes - No No -

3. One DC source for 110V & 48V each isprovided in 220 KV sub station. Healthinessand earth leakage has been checked andfound in good condition. However, battery setis found very old and required for replacement.Year of manufacturing and year of installationof battery set is mentioned as under

Description:110 Volt Battery NO NO - YES No -Battery Received. Commissioning underprogress

Date of Mfg : 2006Date of commissioning: 17.10.2007Description:48 Volt Battery NO NO - YES No - In processDate of Mfg : 2002Date of commissioning: 19.10.20074. Numerical Relay of 160 MVA, 220/132KVand Relay of Feeders of 132 KV are notconnected with GPS, the same may beconnected with GPS

Yes Yes - No No -

5. Synchronizing trolley is not available Yes No - No No - NIT issueed & in process6. Features to be disabled in numerical relayare not found during checking Yes Yes - No No -

7. Time synchronization is required to be donewith existing GPS Yes Yes - No No -

1. Synchronization trolley is not available No No - Yes No - NIT issueed & in process2. Load dropping scheme is to be provided on100 MVA x-mer of CGL make also withfollowing: 110% of full load on x-mer setting: - Trip to132 KV Khapasami Feeder & 132 KVChhindwara Feeder.

Yes Yes - No No - Load dropping scheme connected

3. DG Set is not available at the S/s. Yes Yes - Yes Yes - completed

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1. 110 V & 48 V Battery sets werecommissioned in 2005. Replacement of 110 V&48 V battery set are required

No No - Yes Yes - -

2. Synchronization trolley is not available No No - yes No - Not required3. 220 KV Bus-Bar Protection panel isavailable at the S/s but not commissioned. No No - Yes No 31.12.2016 due to control room extention work ,

commissioning is held up

4. DG Set is not available at the S/s. Estimatefor 25 KVA DG Set is sanctioned, recently No No - Yes No - DG SET AREIN PROCESS OF DELIVERY ON RECEIPT

WILL BE COMMISSIONED SHORTLY

1. GPS System of SANDS make is availablefor 10 Nos relays. IRIG B Port is not availablein ABB make relays. Up gradation/ addition isrequired for unconnected relays.

No No - Yes No - In process

2. Synchronization trolley is not available No No - YeS No - NIT issueed & in process

3. DG Set is not available at the S/s. YES No - YES No - DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

1. Synchronization trolley is not available. No No - YeS No - NIT issueed & in process2. Load dropping scheme is not provided YES YES - No No - Load dropping scheme connected

3. DG Set is not available at the S/s. YES No - YES No - DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

1) 220 kv Daloda-Nagda feeder Zone II settingis 105 % should be minimum 120 % ofprotected line.

YES YES - No No -

2) 220 KV Daloda-REGPL feeder(RadialFeeder) Zone-1 setting 100% of protected lineto be revised to 120 % of protected line.

YES YES - No No -

3) Bus-Bar protection is commissioned. 220KV LBB Protection has been provided on busbar protection panel. Bus bar Protection Panelis not in service to be taken in service. Waitingfor through fault on 220 KV feeder.

YES YES - No No -

4) GPS is not provided. No No - Yes NO - In process5) Load dropping scheme is not provided on160 MVA Xmer. YES YES - No No -

6) Over flux setting of 160 MVA is 120 % isalarm and 140 % trip. To be revised 110 %Alarm and trip to 120 %

Yes YES - No No -

1. Synchronizing trolley is available but notused till date. NO NO - No No - In process

2. Carrier protection panel at remote end is notavailable. NO NO - YES NO To be Procured

3. Battery bank was commissioned on16.11.2012. Battery charger was set off forabout 45 Min voltage dropped from 110 V to106 V. Leakage problem in almost all batteriessince installation.

YES YES - YES No - In process

4. GPS is not available. Bus coupler DPRoscillography triggered through each feedermaster initiation should be provided till GPS isnot available so that fault initiation can beidentified.

NO NO - YES NO under consideration with higher off.

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5. Bus bar protection is not commissioned sofar. Recently supplied. YES YES - No No - Bus Bar scheme commissioned on Dt. 09-

10-15

6. DG set not available. YES NO - YES NO - DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

7. LBB protection scheme at 132 KV notcommissioned. YES YES - No No - -

8. Direct trip scheme is not available in twofeeders Kotmikala 1 & 2. YES NO - No No - In process

9. Load drop not available. YES YES - No No - In process10. Broken conductor feature(negativesequence) not used. YES YES - No No - -

11. DR trigger for fault current sharing shouldbe configured. YES YES - No No - -

12. SF6 & air pressure status on the panel. YES NO - YES YES -13. Relay fault recording menu should beprovided to operating staff. YES YES - No No -

14. Auto reclose scheme is kept off.Recommended to be started. YES YES - No No - -

15. DC voltage (110 V and 48 V) metersshould be provided in control room. No No - YES YES -

16. Annunciation front panel is not having anyindication for auto-reclose operation. YES YES - No No - -

17. Thermo-vision is out of order and regularreadings are not taken on monthly basis. YES YES - No No - -

18. Under-frequency relay supplies are notcommissioned. YES YES - No No - -

19. Df/dt relay is not available. YES NO - NO NO not included in scheme20. Group selection through input energisationshould be provided. YES YES - No No - -

21. Over current /EF relays settings should bedirectional which are non-directional atpresent.

YES YES - No No - -

22. Transformer tertiary circulating current CTis not connected to panel for Circulatingcurrent protection.

YES YES - No No - -

23. Float charger is not in working condition. YES YES - No No - -

24. At 160 MVA transformer REF protection isnot in service. YES YES - No No - -

25. At 40 MVA transformer HV & LV, REFprotection is not in service. Yes NO - No NO Not required

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1) 220KV Ratlam-I DPR GE D-60 healthy andtrouble both LEDs are glowing. Trouble LED isdue to its own internal Battery fail signal. Thetrouble is to be attended so that if otherproblem arises it may be detected.

NO No - Yes Yes - -

2) Trip CKT Supervision relay of 220 KV TBCY phase TC_II is defective (preclose). Yes Yes - NO NO -

3) Two sets of 110 V battery sets are there.DOC are 16/1/13 & 4/2/2007 respectively.Battery sets gravity and voltages are ok. 48 Vbattery set DOC is 2/6/2005. The condition of4 nos. cells is not good (gravity 1.160).

No NO - Yes Yes -

4) A/R and carrier aided tripping not providedin 220 KV Ratlam-I & II feeder. Yes Yes - No No -

5) GPS is provided but not in service. Yes Yes - No No -6) In DPR mho characteristics is used forfeeder which are short in length(i) 132 KV Goutampura-II I length 24KmSuggested to use QUAD characteristic for Ph-G Zone-I

Yes Yes - No No - -

7) In differential relays of 160 MVA AREVAand 100 MVA AREVA Transformer 5thharmonic restrain setting is 25 % to be revisedas per guidelines.

Yes Yes - No No - -

8) Load dropping scheme is not provided on160 MVA Xmer –I & II. Yes Yes - No No - -

1) 220 KV DEWAS feeder bay is having onlyone CVT in R-ph. One additional CVT isrequired in other phase for PH-PH coupling.

Yes No - Yes No 31.09.16 In process

2) 1x110 V and 1x48 V are commissioned inJUNE-2007. Both required replacement. No No - Yes Yes - -

3) In battery room Exhaust Fan is notprovided. Yes Yes - No No - -

4) A/R is commissioned but not in service forboth feeders. Yes Yes - No No - -

5) GPS is provided but not in service. Yes Yes - No No - -6) In DPR mho characteristics is used for boththe CKTs but QUAD characteristics is requiredas line length is less than 50 Km.

Yes Yes - No No - -

7) 220 KV Indore feeder ZONE-2 reach is100% of protected line + 100 %Short lineadopted, its revision is required as per CBIPguidelines i.e. 120% of line to be protected.

Yes Yes - No No - -

8) REF protection is not provided on 100MVA220/33-33 KV Xmer as the neutral CT is notprovided. By providing external Neutral CTscheme may be commissioned.

No No - Yes No 31.12.2016 Proposal Submitted to provided thisarrangment.

9) In DPRs PT FUSE FAIL. PSB/OSB notenabled. Yes Yes - No No -

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10) In 220 Kv DEWAS feeder carriers aidedtripping is not provided which is to beprovided.

NO No - Yes Yes -

1) REF protection is provided on 160 MVAXmer but presently not enabled which isrequired to be enabled.

Yes Yes - No No - -

2) REF protection is provided on 160 MVAXmer but presently not enabled which isrequired to be enabled.

Yes Yes - No No - -

3) 110 V, 200AH battery set is available. DOCis 17/06/2008. Battery sets gravity andvoltages are ok. 48 V, 300AH battery set DOCis 19/08/2007.

Yes Yes - No No - no any deficiency. Battery sets are inhealthy condition

4) A/R and carrier aided tripping not providedin 220 KV feeder. Yes Yes - No No - Completed

5) Bus-Bar protection is not commissioned. No No - No No - Turn key project to be completed by M/sShreem

6) LBB is provided on 132 KV Xmers but notprovided in 220KV Xmer/feeder. Yes Yes - No No - -

7) GPS is not provided. No No - Yes No - In process8) Load dropping scheme is not provided on160 MVA Xmer. Yes Yes - No No - -

9) In backup relay directional feature in notenabled for both 220 KV Xmer & feeder, whichis to be enabled as per the guidelines.

Yes Yes - No No - -

10) Timings for zone2 & zone3 is to bereviewed in accordance with the coordinationfor 220KV tapped line at Dhar substation end.

Yes Yes - No No -

11) In 40 mva Xmer I&II differential relay slope2 chosen is 90%, which is to be revised as perthe guidelines.

Yes Yes - No No -

1) 220 kv Transfer panel numerical relay is tobe provided.. YES YES - YES YES - -

2) REF protection in 160MVA-I CT is notprovided in neutral bushing hence REF notprovided.

YES NO - YES NO NEUTRAL BUSHING CT IS REQUIRED

3) 132 KV feeders INT-I & INT-II (4 & 5 Kmlength) mho setting of Zone-1 to be changedto QUAD (Ph-G).

YES YES - NO NO

4) AR not configured in both 220 KV Dalodaand Nagda feeder. NO NO - NO NO 31.12.2016

NO PROVISION IS PROVIDED IN C&RPANEL OF 220 KV DALODA PANEL , &AR RECLOSURE WILL BECONFIGURED UP TO NEXT MONTH

5) Trip circuit healthy of feeders found ok. Inold 220 KV C&R panels only one set of triphealthy LEDs are provided. Not available forTCH-II.

Yes Yes - NO NO - -

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6) 110 V 600 AH and 48 V 300 AH chargersare very old (Yr of Mfg 1989) SHEETRONmake having float section defective andcharger is having fuses in load side(presentlynot in practice). Replacement of charger maybe considered.

YES Yes - YES Yes Completed

7) GPS is provided and not connected for Busbar protection panel. Yes Yes - No NO - -

8) Load dropping scheme is not provided on160 MVA-II Xmer. Yes YES - NO NO - -

1. Bus Bar Protection scheme available butnot commissioned. GE Make B-90 Bus barprotection scheme is under commissioningtherefore it is suggested that Zone-IV reachand delay of 220KV feeders can be revised tocover 220 KV so that it can operate in 200ms.

Yes Yes - NO NO - Commissioned

2. DG Set not available. Yes NO - Yes NoDG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

3. 220 KV Bhopal feeder:- relay settingschecked and verified. The zone-III reach is tobe reviewed in accordance with LILO of 220KV

Yes Yes - NO NO - Completed

4. 132/33KV, 63 MVA X'mer-1:- relay settingschecked & verified. It is suggested to revisethe step-1 bias setting to 20% to make therelay more sensetive.


5.UE make electromagnetic back up relay is inservice for 63 MVA X'mer-II on 132KV side. Itis suggested to replace it by suitable relay. It isintimated that a static back-up relay has beenarranged for this replacement.


6. 132KV Vidisha-Gulabgunj Railway Traction-I&II:- this line is protected by Backup O/C &E/F relay as main protection DPR notprovided.

NO NO - Yes No - 2 No C&R panel for 132 KV feeder isbeing released

1. DF/DT relay not available. NO NO - Yes No 31/03/2016 Df/dt Relay Required,

2. 220 KV Rajgarh-Sujalpur PGCIL-II:- relaysettings checked and verified. It is found thatthe Zone-II reach is taken as 105% of theprotected line. It may be due to the very shortline in the next section of PGCIL.

Yes Yes - NO NO - Revised

3. 132/33 40MVA X'mer-II:- relay settingschecked and verified. The bias setting is takenas 30%. It can be revised to 20% to make itmore sensitive.


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4. 220 KV Bus Bar protection commissionedrecently on date 06.02.2015. it is underobservation and taken in alarm mode. It isintimated that tripping shall be connected afterchecking performance on any through faultcondition.

Yes Yes - NO NO - Taken in service for Trip

5. DC leakage detected in 110 Volt DCsystem. DC -ive to earth value showing0.5volts it is intimated. It is intimated that ithas occurred recently already in notice,remedial action is already in process.

Yes Yes - NO NO - ATTENDED

6. DG sets is not available No NO - Yes NO - DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

7. it is suggested that Zone-4 reach and timedelay can be revised so as to cover 220KVbus only so that it can work as backup to busbar protection to operate in 200msec.


8. some of the relays are not synchronisedwith GPS, proper synchronization is to bearranged.

Yes Yes - No NO - -

1. ZONE 4 TIME SETTING PROVIDED 1000ms, HOWEVER IT SHOULD BE VERIFIEDAND REVISED AS PER CBIP GUIDLINES


2. GPS SYSTEM SANDS MAKE FAILSFREQUENTLY NEEDS RECTIFICATIONAND ITS RESTORATION AT THE EARLIESTFOR PROPER FUNCTIONING.

Yes Yes - NO NO - -

3. BATTERY ROOM SIZE IS NOTSUFFICIENT .NO SPACE FORMAINTENANCE PURPOSE AND UNSAFE,HENCE ACCOMODATING/INSTALLINGBATTERIES SUITABLY IN THE ROOM .

Yes Yes - NO NO -

4. 220 KV DC BATTERY FLOAT CHARGERIS NOT WORKING .CHARGING IS DONETHROUGH BOOST CHARGER ONLY ATLESS CURRENT. FLOAT CHARGER NEEDSTO BE MADE OPERATIONAL.

Yes Yes - No NO - -

5. NEGATIVE IS EARTHED IN D.C.SYSTEM, IT SHOULD BE RECTIFIED. Yes Yes - NO NO -

6. SYNCHRONISING TROLLY IS AVAILABLEBUT NOT IN WORKING CONDITION Yes Yes - NO NO - -

7. NO METALLING IS FOUND INSWITCHYARD. IT HAS BEEN INTIMATEDSINCE COMMISSIONING OF SUB-STATIONDATED 11.02.1998,METALLING NOT DONE.

No NO - Yes NO - Tender is under negotiation

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8. FIRE PROTECTION SYSTEM IS NOTAVAILABLE IN BOTH TRANSFORMERSEACH OF 160 MVA, 220/132 KV . ITSHOULD BE PROVIDED FOR SAFETYPURPOSE.

No NO - Yes NO - In process

1. A/R is disabled, the same should beconfigured and taken in service. Yes No - No NO -

PGCIL is presently not agree due to stresson ICT's. They have saught consent ofPGCIL Vadodara H.Q.

2. Directional feature is not available in O/CE/F relays of 220 KV & 132 KV feeders. No No - Yes No - In process

3. 110 V & 48 V Battery sets werecommissioned in 2004. The Battery sets arevery old. It requires capacity test /replacement.

No No - Yes No - In process

4. GPS system of SANDS make isavailable. It is connected to differential relaysof 3x40 MVA x-mer. It is to be connected withrest of the relays. GPS system is also showing‘GPS fail’ LED. Time of GPS unit is notmatching with connected relay. GPS systemmay be got attended.

Yes Yes - No No - GPS is repaired by firm

5. Synchronization trolley is not available. Yes No - Yes No - NIT issueed & in process

6. No multiple earthing of CT secondarycircuit is there at the substation. It is checkedby removing earthing CT secondary star pointat CT junction box of 220 KV B/C.

Yes Yes - No No -

7. LBB scheme is not provided. No No - Yes No - LBB relays & tripping relays are beingarranged

8. Load dropping scheme is not available. No No - No No - In process

9. DG set is not available. No No - Yes No - DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

10. Electromechanical relays are used forback up protection (Except 132 KV Badgaon). No No - Yes No - In process

11. In 220 KV CTs no separate core of PSclass is available for Bus Bar Protection. YES Yes - No No - -

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1. AUTO RECLOSE IS NOT ENABLED IN220 KV FEEDER RELAYS AND NECESSARYACTION SHOULD BE TAKEN FOR MAKINGIT ENABLE

Yes NO - No No - Work in progress.

2. ZONE-4 TIME SETTING IS TO BEREVISED, AT PRESENT 1000ms SETTINGPROVIDED AND TO BE SET AS PER CBIPGUIDELINE

Yes Yes - No No -

3. FIRE PROTECTION SYSTEM FOR 160MVA, 220/132/33 KV TRANSFORMER ISNOT AVAILABLE. IT NEEDS TO BEPROVIDED FOR SAFETY POINT OF VIEW.

NO No - YES NO - Procurement approval is in process

4. BATTERY SET COMMISSIONED ON06.06.08 & SERVED ITS USEFUL LIFE.STATION BATTERY NEEDS TO BEREPLACED.

No No - YES NO - In process

5. FLOAT CHARGER OF 110 V STATIONBATTERY & 48 V PLCC BATTERY IS NOTIN WORKING ORDER. PROBLEM SHOULDBE RECTIFIED FOR MAKING FLOATCHARGER OPERATIONAL.

Yes Yes - No No -

6. 220 KV S/S SIDHI CONNECTED TOAMARKANTAK THERMAL POWERSTATION THROUGH 220 KV AMARKANTAKFEEDER. HENCE, SYNCHRONIZATIONTROLLEY SHOULD BE PROVIDED.

Yes No - YES NO - NIT issueed & in process

1. GPS IS NOT AVAILABLE IN SUB-STATION, IT SHOULD BE PROVIDED FORRELAY TIME SYNCHRONIZATION.


2. AUTO RECLOSE IS NOT ENABLED IN220 KV FEEDER RELAYS AND NECESSARYACTION SHOULD BE TAKEN FOR MAKINGIT ENABLE

Yes No - No No - Work in progress

3. ZONE-4 TIME SETTING IS TO BEREVISED, AT PRESENT 1000ms SETTINGPROVIDED AND TO BE SET AS PER CBIPGUIDELINE.

Yes Yes - No No -

4. FIRE PROTECTION SYSTEM FOR 160MVA, 220/132/33 KV TRANSFORMER ISNOT AVAILABLE. IT NEEDS TO BEPROVIDED FOR SAFETY POINT OF VIEW.

No No - Yes No - Procurement approval is in process

5. FLOAT CHARGER OF 110 V BATTERYCHARGER IS NOT WORKING, PROBLEMSHOULD BE RECTIFIED FOR TAKING ITINTO SERVICE.

Yes Yes - No No -

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1. 220KV Bhopal-1 :- It is suggested to reviewthe zone-III setting in accordance with thechange in the line length at other ends. Atpresent it seems higher.

Yes Yes - No No -

2. 220/132KV, 160MVA X'mer-1:- The slope-1setting given as 30%. It can be revised to 20%to make the protection more sensitive.

Yes Yes - No No -

3. 132/33KV, 20MVA X'mer-1:- The slope-1setting given as 30%. It can be revised to 20%to make the protection more sensitive.

Yes Yes - No No -

4. Float charger of 110V Battery charger is notworking, requires rectification at earliest. Yes Yes - No No -

5. Some of the 220KV & 132KV CB timing isto be taken. It is suggested to carryout thetesting in coming maintenance schedule.if

Yes Yes - No No -

6.DG set is not available No No - Yes No - DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

1) A/R and carrier aided tripping notprovided in 220 KV feeders. YES YES - Yes No -

Out door equipments and protectioncoupler is required for 220 KV Bicholifeeder.

2) GPS is provided but not in service. YES YES - No No3) Partial negative D.C. leakage observed.Positive to earth voltage=87 volt and Negativeto earth =33 volts

YES YES - No No -

4) In backup relay directional feature in notenabled for both 220 KV X-mers & feeder,which is to be enabled as per the guidelines.

Yes YES - No No -

5) In 160 MVA TELK X-mer differential relayslope 2 chosen is 90%, which is to be revisedas per guidelines. High set settings & Fifthharmonic blocking setting also to be reviewedas per the guidelines.

Yes YES - No No -

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Remark

1. Relay setting calculation checked.Setting verified with relay for 160 MVA x-er.SOTF, PSB and VT fuse fail features areenabled in DPRs.Setting for zone 3 may bereviewed to restrict reach not to cover nextvoltage level at far end of line.

Yes Yes - No No -

2. Direct trip and A/R are not in service.The same should be configured and taken inservice. The outdoor PLCC equipment are notavailable for 220KV Itarsi feeder-1.

No No - Yes No - work under progress

3. GPS system of SANDS make isavailable. It is connected to differential relaysof 160 MVA x-mer-1. It is to be connected withrest of the relays.Time of GPS unit is notmatching with connected relay. GPS systemmay be got attended.

Yes Yes - No No - GPS connected

4. Synchronization trolley is not available. No No - Yes No - NIT issueed & in process

5. Load dropping scheme is not available. Yes Yes - No No - Load dropping scheme connected6. DG set is not available. Yes Yes - Yes Yes - Completed7. Most of the backup relays are electromechenical type. No No - Yes No Numrical relays to be procured

1. FIRE PROTECTION FOR 220KV/132KV,160 MVA TRANSFORMER IS NOTAVAILABLE AND IT SHOULD BEPROVIDED.

No No - Yes No - Procurement approval is in process

2. AS SUCH KOTAR S/S IS CONNECTEDTO TONS HYDEL POWER STATIONTHROUGH 220 KV TONS FEEDER, HENCESYNCHRONIZING TROLLEY SHOULD BEPROVIDED AT THIS SUB-STATION. ATPRESENT SYNCHRONIZING TROLLEY ISNOT AVAILABLE.

No No - Yes No - NIT issueed & in process

3. GPS SYSTEM IS NOT AVAILABLE IN SUB-STATION. No No - Yes No - In process

4. FLOAT CHARGER OF 110 V AND 48 VBATTERY CHARGER ARE NOT WORKING/OUT OF SERVICE, PROBLEM SHOULD BERECTIFIED/ ATTENDED FOR MAKING ITOPERATIONAL.

Yes Yes - No No -

5. LBB PS VALUE IS FOUND HIGH (1.05). ITSHOULD BE COORDINATED PROPERLYAS PER GUIDELINE.

Yes Yes - No No -

6. ZONE-4 TIME SETTING IS TO BEREVISED, AT PRESENT 1000ms SETTINGPROVIDED AND TO BE SET AS PER CBIP.

Yes Yes - No No -

7. NEGATIVE SUPPLY IS EARTHED IN 110V D.C. SYSTEM, WHICH SHOULD BEREMOVED AT THE EARLIEST.

Yes Yes - No No -

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8. IN 220 KV 160 MVA TRANSFORMER C&smake CSPC RELAY EARTH FAULT TMSSEEMS HIGH (1.0). IT SHOULD BEREVIEWED AND TO BE CORRECTED IFREQUIRED.

Yes Yes - No No -

1) REF protection is not provided on 160 MVAI, II & 63 MVA Xmer. Yes Yes - NO NO -

2) Numerical relays are provided for Mainprotection & found healthy in all bay . Featureof D60 relay (DPR) is used as a differentialprotection for 160 MVA Transformer No 1, itrequires replacement by other numericaldifferential relay to utilize other features likeREF etc.

No No - Yes Yes - -

3) Trip CKT Supervision relays are provided &indicating healthy condition. TCH Lamps foundoff for 16 MVA Xmer, 132 KV Kukshi –onelamp, 132 KV Inter Conn.-1 &2 one lamp,160MVA I & II 220 KV side

Yes Yes - NO NO -

4) 1x110 V and 1x48 V are commissioned inNov 2005& 2006 respectively. Both requiredreplacement being very old. In 110 Battery setone cell is out.

No No - Yes No 31.03.2016 In process

5) In battery room Exhaust Fan is notprovided. Yes Yes - NO NO -

6) A/R is not in service for both 220 KVfeeders. Yes Yes - NO NO -

7) GPS is provided but not in service. Yes Yes - NO NO - -

8) In DPR mho characteristics is used forfeeder which are short in length(i) 132 KV Int. Conn.I and II length 5.6 &6 KmSuggested to use QUAD characteristic.

Yes Yes - NO NO -

9) ZONE-3 Time setting provided 800 mswhich is to be revised to 700 ms. Yes Yes - NO NO -

10) Load dropping scheme is not provided on160 MVA Xmer –I & II. Yes Yes - NO NO -

11) DGA test results has not been carried outsince last two years for both 160 MVA Xmer inJan’14 samples sent to Oil Lab Ujjain butresults were not reliable due machine problem.To be carried out twice in a year.

Yes Yes - NO NO -

12) In 220 KV PGCIL–I & II feeder carriersaided tripping has not been provided which isto be provided.

Yes Yes - NO NO -

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1. Synchronizing trolley is not available. No No - YES NO - NIT issueed & in process

2. Carrier protection panel at remote end is notavailable YES No - YES NO - To be required.

3. Battery bank was commissioned on05.06.2006. Battery charger was set off forabout 2.5 hrs, voltage dropped from 110 V to105 V. Two cells are not working.Recommended for replacement.


4. GPS is available but not enabled in relay. Yes YES - No No - -

5. Bus bar protection kept off since 13.07.14.Needs to be taken into service YES YES - No No - -

6. DG set not available. YES No - YES NO DG SET AREIN PROCESS OF DELIVERY ON RECEIPTWILL BE COMMISSIONED SHORTLY

7. LBB protection scheme at 132 KV notcommissioned. YES NO - No No - Work in progress

8. Direct trip scheme is not connected for220KV feeders. YES NO - No No - Work in progress

9. Broken conductor feature not used. Yes YES - No No - -

10. DR trigger for fault current sharing shouldbe configured. YES NO - No No - Work in progress

11. SF6 & air pressure status on the panel. YES Yes - YES NO alarm/indication facia is to be procured

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12. Relay fault recording menu should beprovided to operating staff. YES YES - No No -

13. Auto reclose scheme is kept off.Recommended to be started after problemrectification.

YES YES - No No - -

14. DC voltage (110 V and 48 V) metersshould be provided in control room. No No - YES YES - -

15. 110V Battery charger voltage select switchis not working float charger is not in workingcondition.

YES YES - No No - -

16. Annunciation front panel is not having anyindication for auto-reclose operation. YES YES - No No - -

17. Thermo-vision is out of order and regularreadings are not taken on monthly basis. YES YES - No NO - -

18. Under-frequency relay supplies are givenwithout fuse in between. YES YES - No No - -

19. Df/dt relay is not connected. NO NO - No No - Not in plan

20. Group selection through input energisationshould be provided. YES NO - No No - Work in progress

21. Over current /EF relays settings should bedirectional which are non-directional atpresent.

YES YES - No NO

22. Transformer tertiary circulating current CTis not connected to panel. YES YES - No No - -

23. At 160 MVA transformer REF protection isnot in service. NO NO - Yes No - Work in progress

Cont…33

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Page 1 of 2

Name of the Organization: NTPC Limited-WR stations

Sr.No Deficiency Observed during BasicProtection Audit

Action taken / proposed to betaken

TimeSchedule

Name of the Sub-station / Switchyard: Vindhyachal STPP

1. Replacement of balance Staticdistance protection relays, withNumerical relays, in line withGazette notification of GOI for 400kV Satna 1 & 2 lines.

Completed Complied-Bcategory

2. 63 MVAR Bus reactor needs to betaken into service.

Put in service Complied-Bcategory

3. Main-I and Main-II Distanceprotection Schemes for all feedersneed to be different make/characteristic for 400 kV Sasan,Mahan, and Satna-III & IV lines.

Being adopted. Complied-Bcategory

4. Earth fault in 220 V switchyard DCsystem to be attended.

Ongoing routine activity Complied-Acategory

Name of the Sub-station / Switchyard: Korba STPP

1. Over voltage relay: Drop off to Pick upratio is not explicitly available inMicom relays.

Minimum Drop off / pick up ratioof 95% is available in MiComrelay and it is in order as far asover voltage protection isconcerned. With a very highreset/operate ratio, chatteringphenomena may be observed inrelay.

Complied-Acategory

2. Power swing blocking is enabled forZ2, Z3 and Z4. However de-blockingtimer is set at 2 sec. The same maybe reviewed.

Power swing blocking logic has tobe universally decided across thegrid. De-block timer of 2 sec hasbeen adopted in all NTPCstations and is in line with NRPC /ERPC recommended settingguideline.

Complied-Acategory

3. Auto re-close relay reclaim timer notuniform for all lines. Stage-I lines ishaving 10 secs and the same is 25secs for stage-II lines. This may bereviewed.

Reclaim time of 25secs to beadopted for all lines as per NTPCpractice.

Complied-Acategory

Page 2 of 2

Sr.No Deficiency Observed during BasicProtection Audit

Action taken / proposed to betaken

TimeSchedule

4. Zone 2 time delay is different fordifferent lines (300ms and 400ms).The same may be reviewed.

As per NTPC practice, Zone-2time delay of 400ms is beingadopted & it is 500ms in case oflong lines followed by short lines.The same to be adopted.

Complied-Acategory

Name of the Sub-station / Switchyard: Sipat STPP

1. Time Synchronization: All numericalrelays except 5 nos relays of 765KVand 4 nos of relays of 400KV are timesynchronized.

Taken up with OEM. Only 01relay could be synchronized withGPS successfully.

Complied-Bcategory

2. Time setting of both Stage-I andStage-2 are same in all 765KV and400KV LBB relays.

The setting has been reviewedand found in order.

Complied-Acategory

3. Over voltage relay: Drop off to Pick upratio is not explicitly available inMicom relays.

Minimum Drop off / pick up ratioof 95% is available in MiComrelay and it is in order as far asover voltage protection isconcerned. With a very highreset/operate ratio, chatteringphenomena may be observed inrelay.

Complied-Acategory

4. Power swing blocking is enabled forZ2, Z3 and Z4. However de-blockingtimer is set at 2 sec. The same maybe reviewed.

Power swing blocking logic has tobe universally decided across thegrid. De-block timer of 2 sec hasbeen adopted in all NTPCstations and is in line with NRPC /ERPC recommended settingguideline.

Complied-Acategory

Name of the Sub-station / Switchyard: Jhanor Gandhar GPS

1. Replacement of existing static relaysfor line protection with Numericaldistance relays.

PO placed. Complied-Bcategory

Zone-1B Forward Minimum of (120 % of Protected line or Zone-2) 0

** For Mundra-Jetpur-1 & 2 line, Zone-2 reaches next voltage level. So, even if Mudra-Jetpur-1 & 2 are

parallel lines, the reach of zone-2 is taken as 120% instead of 150%.

For Rest of the lines, philosophy followed as mentioned in above table.

Transmission line protection philosophy based on Ramakrishna Committee report

Zone-3 Forward 100 % of protected line + 120 % of adjacent Longest line 1 Sec

Zone-4 Reverse 10 % Zone-1 0.35 Sec

Time

Delays

Zone-1 Forward 80 % of the protected line 0 Sec

Zone-2 Forward

120% of own line impedance (for radial line)

OR

150% of own line impedance (for parallel line) **0.35 Sec

Arc Ressistance Ph-E = 15 Ohms

Zone Direction Settings

Tower Footing Ressistance = 10 Ohms

Arc Ressistance Ph-Ph = 7.5 Ohms

Values considered for calculation

Angle = 85.63963

For Calculation factors cosidered are

CT Ratio

CT Details

CT primary

CT Secondary

3636.364PT Ratio2500

0.2

72.448 56.6

Line Capacity =

Impedance in Primary

R1 X1 R0

16.08

Factor for Secondary conversion CTR/PTR

5.52416

Distance Relay Setting for 400 kV Mundra-Bhachau line-1 & 2

R1 X1 R0 X0

0.01952 0.256 0.8624Ohms/km

2000 Amp

X0Line

DistanceLine Details

1.952 25.6 20 86.24 100 Mundra-Bhachau

0.16592 2.176 1.7 7.3304 8.5 Bhachau-Versana

244.0592 283 Bhachau-Ranchorpura

PT Details

2500 PT primary 400000

1 PT Secondary 110

0.6875

Zone Settings

Zone-1 Zone-2Zone-3 considering

Longest line

=

Zone-4 (Reverse) Zone-1B

Primary Sec. Primary Sec. Primary Sec. Primary Sec. Primary Sec.

Zero Sequence Compensating Factors

R 1.56 1.07 2.93 2.01 8.58 5.90 8.58 5.90 2.34 1.61

Rph 9.06 6.23 10.43 7.17 11.06 16.08 11.06 9.84 6.77

RE 26.56 18.26 27.93 19.20 33.58 23.09 33.58 23.09 27.34 18.80

30.72X 20.48 14.08 38.40 26.40 112.54 21.12

Reactance Ohms / km primary = 0.256

Reactance Ohms / km Secondary = 0.176

77.37 2.05 1.41

Calculation of Minimum Load Impedance

Voltage = 85 %

Overload = 150 %

Zload (Min) Primary = 65.433

Zload (Min) Secondary = 44.98519

XE / XL 1/3 ((Xo / X1 - 1)) = 0.79

RE / RL 1/3 ((Ro / R1 - 1)) = 3.082

All setting impedance values are per phase


PT Ratio

PT Details

PT primary

PT Secondary

2500

CT primary 2500

CT Secondary 1

RE / RL 1/3 ((Ro / R1 - 1)) = 3.082

XE / XL 1/3 ((Xo / X1 - 1)) = 0.79




Overload = 50 %



Voltage = 85 %

4.59 3.15 68.81 47.31


59.28

30.25 20.79

12.75 8.76

X 45.88 31.54 68.81 47.31 86.22

RE 28.50 19.59 30.25 20.79 31.57 21.71

14.07 9.68 14.07 9.68

6.57 4.52

31.57 21.71

5.25 3.61

Rph 11.00 7.56 12.75 8.76

R 3.50 2.40 5.25 3.61 6.57 4.52

Primary Sec.Sec. Primary Sec.

Zone-4 (Reverse) Zone-1B

Primary Sec. Primary Sec. Primary

Zone Settings


Longest line

3636.3636

Factor for Secondary conversion CTR/PTR = 0.6875

CT Ratio

400000

110

1.83488 24.064 18.8 81.0656 94 Halvad-Chornia

CT Details

1.838784 24.1152 18.84 81.23808 94.2 Halvad-Chornia

Line Details

4.37248 57.344 44.8 193.1776 224 Mundra-Halvad

Line Capacity = 2000 Amp


R1 X1 R0 X0Line

Distance

0.01952 0.256 0.2 0.8624Ohms/km

Distance Relay Setting for 400 kV Mundra-Halvad line-1

R1 X1 R0 X0


Angle = 85.63963


CT Details

CT primary

CT Secondary

CT Ratio

Distance Relay Setting for 400 kV Mundra-Jetpur line-1 & 2

R1 X1 R0 X0

0.01952 0.256 0.2 0.8624Ohms/km



R1 X1 R0 X0Line


6.57824 86.272 67.4 290.6288 337 Mundra-Jetpur

1.30784 17.152 13.4 57.7808 67 Jetpur-Amreli-2

6.57824 86.272 67.4 290.6288 337 Jetpur-Mundra

PT Details

2500 PT primary 400000

1 PT Secondary 110

2500 PT Ratio 3636.3636


Zone Settings


Longest lineZone-4 (Reverse) Zone-1B

Primary Sec. Primary Sec. Primary Sec. Primary Sec. Primary Sec.


R 5.26 3.62 7.89 5.43 14.47 9.95 14.47 9.95 7.89 5.43

Rph 12.76 8.77 15.39 10.58 21.97 15.11 21.97 15.11 15.39 10.58

RE 30.26 20.81 32.89 22.61 39.47 27.14 39.47 27.14 32.89 22.61

X 69.02 47.45 71.17 189.80 130.49 6.90 4.75 103.53 71.17




Voltage = 85 %

Overload = 150 %



RE / RL 1/3 ((Ro / R1 - 1)) = 3.082

XE / XL 1/3 ((Xo / X1 - 1)) = 0.79

103.53



Distance Relay Setting for 400 kV Mundra-Limbdi (Chornia) line-2

R1 X1 R0 X0

0.2 0.8624Ohms/km

0.01952 0.256



R1 X1 R0 X0Line


6.10976 80.128 62.6 269.9312 313 Mundra-Limbdi (Chornia)

1.838784 24.1152 18.84 81.23808 94.2 Limbdi (Chornia)-Mansar

4.500336 59.0208 46.11 198.8263 230.55 Limbdi (Chornia)-Kosamba

CT Details PT Details

CT primary 2500 PT primary 400000

CT Secondary 1 PT Secondary 110

CT Ratio 2500 PT Ratio 3636.364

Primary Primary


Zone Settings

Primary Primary

Rph 12.39 14.83 19.01

R 4.89 7.33 11.513.36

8.52

X 64.10 96.15 150.95

RE 29.89

66.11

20.55

44.07

Reactance Ohms / km primary 0.256

19.01 14.83

36.51 32.3332.33 36.51 25.10

4.41

Reactance Ohms / km Secondary 0.176


Voltage = 85 %

Overload = 150 %



XE / XL 1/3 ((Xo / X1 - 1)) = 0.79


Zone-1BZone-1 Zone-2Zone-3 considering

Longest lineZone-4 (Reverse)

RE / RL 1/3 ((Ro / R1 - 1)) = 3.082

Secondary Secondary Secondary Secondary SecondaryPrimary

7.33

96.15

7.91

13.07

25.10

103.78

7.915.04

10.20

22.23

13.07

6.41

5.04

10.20

22.23

66.11

11.51


FORMAT -1 (PROTECTION AUDIT)

State

(D)Target date for completion

of audit.

(E ) No. of S/S where

deficiencies detected.

132 kV 220 kV 400 kV 765 kV HVDC Total 132 kV 220 kV 400 kV 765 kV HVDC Total 132 kV 220 kV 400 kV 765 kV HVDC Total

Maha 2013 334 183 24 2 543 11 76 22 0 109 323 107 2 0 434 NA NA

maha 2014 335 186 24 2 547 49 89 12 0 150 286 97 12 0 397

Guj 47 81 11 146 285 47 74 0 121 0 7 11 164 30.9.2013 for 132 & 220 kV 80 (30+ 50)

CG 18 1 19 18 1 19 0

MP gen 9 5 3 17 0 5 3 8 9 0 0 9 01/11/2014 8(5+3)

Trans+JP 62 9+1 72 62 9+1 72 0 0 0

OSP 1 1 1 1 0 0 30/09/2016 Tendered

ISP 1 1 1 1 0 0 15/09/2015

WR-I (PG) 0 0 8 3 1 12 0 0 8 3 1 12 0 0 0 0 0 0 NA

WR-II (PG) 11 3 14 11 3 14 0 0 0 4

NTPC 1 3 4 1 3 4 0 0 0

Total

(I) Reason/remarks for

rectification of deficiencies

requiring period of more than

one year.

(J) Cost estimates for removal

of deficiencies.

132 kV 220 kV 400 kV 765 kV HVDC Total 132 kV 220 kV 400 kV 765 kV HVDC Total 132 kV 220 kV 400 kV 765 kV HVDC Total

Maha 2013

Maha 2014 7 22 7 36 6 23 6 35 NA

Guj 4 30 4 38 13 24 9 46

CG 17 1 18 1 1

MP gen

Trans+JP 57 8 65 5 2+0 7

OSP 0+1 0+1

ISP 1 1

Because REL 316 is to be

replaced with latest relay

WR-I (PG) 5 2 7 0

WR-II (PG) NA

WR-I (NTPC) 1 3 4

TOTAL

1. RPCs

(State

wise)

Recommendation 9.1.1: There is a need to review protection schemes. This Committee concurs with recommendation of previous enquiry committee that a throrough third party protection audit need to be carried out in time bound manner. This

exercise should be repeated periodically and monitored by RPC's. Action : RPCs, CTU, STUs.

(F) Action plan (on observation of third party

protection audit) finalization date/Target date for

finalizing plan

(G) Detail of S/S where no procuremnet is required for

removal of deficiencies. No. of S/S

Target date for removal of deficiencies

(H) Detail of S/S where procurement is required. No. of SS

Target date of removal of deficiencies.

(A) Total No. of S/S in region. (B) No. of S/S identified for audit. ( C) No. of S/S yet to be audited

Agency

2. CTU

(Region

wise)

1. RPCs

(State

wise)

2. CTU

(Region

wise)

HCL

Text Box

Annexure 7

FORMAT -2 ( REVIEW OF ZONE - 3 PHILOSOPHY)

WRPC

Constituent \ kV 765 400 220 Total 765 400 220 Total 765 400 220 Total 765 400 220 Total

Maha 24 186 210 24 186 210 24 186 210

Guj 11 81 92 11 81 92 11 81 92 NA

CG 1 18 19 1 18 19 1 18 19

MP gen 3 5 8 3 5 8 3 5 8 NA

MP tran+JP 9+1 62 72 9+1 62 72 9+1 62 72 NA

OSP 1 1 1

ISP 1 1 1 NA

WR-I (PG) 3 8 0 3 8 0 3 8 0 NA

WR-II (PG) 3 11 14 3 11 14 3 11 14 NA

(NTPC) 3 1 4 3 1 4 3 1 4

Total No. of S/S at 220 kV &

above (132 KV & above in NER

states, J&K, Uttarakhand, HP,

Sikkims, etc)

No. of sub-stations

covered at each voltage

level.

No. of S/S where revised Z-III

setting have been

implemented.

Month and year by when revised

Z-III settings would be

implemented at remaining sub-

station.

Recommendation 9.1.2: Till protection audit is taken up, there is a need to take immediate review of zone 3 philosophy in paticular. Techniques are

available to modify characteristics of the relay so that it can distinguish between load encroachment and faults. These techniques and other

alternatives should be explored immediately. Action : RPCs, CTU, STUs.:

No. of PMUs

installed Locations

No. of PMUs functional and

time syndchronised

Target date for making

defective PMU functionalNo. of PMUs Locations

Target date for

commissioning

Maha 16 35 51

Guj 1 25 26

CG

MP+JP 1+2 1+2

WR-I (PG) 6 6

WR-II (PG) 6 6

NTPC 2 2

IPP 3 3

PurposeTrigger for SPS

operation

Result of SPS

operations

Maha

Guj 6

CG

MP+JP

WR-I (PG)

WR-II (PG) 2

WR-I (NTPC)

WR-II (NTPC)

Target date of

Finalization of

SPS

Format -3

Details of SPS Being Planned / Under studyPurpose of SPS

Trigger for SPS

operation

SPS under Implementation

result of SPS operations

(detailof load

shedding/backing down)

Target date for

commissioning

of SPS

S No. Constituent

S No. Constituent

Details of existing PMUs Total No. of

PMUs in the

State

SPS is already operational at present

Additional PMUs planned to be insatlled

List of NI PMUs installed under WRLDC pilot project Maharastra

S.No Sub-station owner Sub-stationDate of

CommissioningCT Connection (Feeders ) PT Connection S. NO. Voltage (kV) PMU Location

1 WRTS-I Boisar 10.04.2013 Phadke, Tarapur-2 Bus-1 1 400 Chandrapur

2 WRTS-I Bhadravathi 16.04.2013 Raipur-2, Raipur-3 Bus-1 2 400 Bhusawal

3 WRTS-I Solapur 400kV 18.04.2013 Kolhaur-1, Parli-1 Bus-1 3 400 New Koyna

4 NTPC Korba 10.09.2013 Bhatupara, Generator-6 Bus-2 4 400 Padghe

5 NTPC Vindhyachal 18.09.2013 Jabalpur-1, Korba-1 Bus-1 5 400 Dhule

6 WRTS-I Solapur 765kV 26.12.2013 Raichur- 1 & 2 Bus-1 6 400 Kalwa

7 WRTS-II Dehgam 13.04.2013 Gandhar-2, Pirana-2 Bus-1 7 400 Kolapur

8 WRTS-II Itarsi 20.04.2013 Jabalpur-2, Indore-2 Bus-1 8 400 Aurangabad

9 WRTS-II Satna 23.04.2013 Bina-3, Vindyachal-3 Bus-1 9 400 Lamboti

10 MPPTCL Bina MP 13.09.2013 PGCIL-1, Bhopal-1 Bus-1 10 400 Lonikand

11 CGPL CGPL Mundra 06.09.2013 Limbdi-2, GT-3 Bus-2 11 400 Girwali

12 220 Trombay

List of SEL PMUs installed under NLDC pilot project 13 220 Eklahare

S.No Sub-station owner Sub-station Date of CT Connection (Feeders ) PT Connection 14 220 Boisar

WR II

No. of PMUs Location

No. of units

functional &

Time

Synchronised

1 Vapi 1

3 GETCO Asoj 1.11.2013 Indore-1 Bus-1

4 MSETCL Kalwa 9.11.2013 Padghe-II, Kharghar Bus-1, Bus-2

List of Demo GE PMUs

S.No Sub-station owner Sub-station CT Connection PT Connection

1 WRTS-II Itarsi Jabalpur-1 Bus-1

2 WRTS-II Jabalpur Itarsi-1 Bus-1

List of IPP PMUs

S.No Sub-station owner Sub-stationCT Connection

(Feeders )PT Connection

1 APLAPL Mundra

(Siemens)Dehgam-2, Hadala Bus-1

2 WRTS-I Dhariwal (NI)Bhadrawathi-

2,Dhariwal-2Bus-1

3 TRN TRN Tamnar-1, Tamnar-2 Bus 1 , Bus 2

Bus-1, Bus-2

2 WRTS-I Raipur 08.11.2012 Korba-3, Raigarh-1 Bus-1, Bus-2

1 WRTS-II Jabalpur 02.11.2012 Itarsi-2, Vindyachal-4

Action: STUs, RPCs, Posoco, Time frame: immediate

No.Target date of

commissioning

Maha 389 389 0

Guj

149 145 4

OEM is contacted

for repairing scheme

NA TBD TBD

CG

MP+JP 283+0 283+0 0

OSP 8 8 0

ISP 12 12 0

WR-I (PG)

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

No.Target date of

commissioning

Maha 31 28 3 _ _ _ _

Guj

149 145 4

OEM is contacted

for repairing scheme

NA TBD TBD

CG

MP+JP 34+2 34+2 0

OSP 0 0 0

ISP 12 12 0

WR-I (PG)

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

POSOCO

(Petition wise)

WRLDC

Maha

Guj

CG

MP

WR-I (PG)

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

Format - 4 (Enabling UFR and df/dt relay)

Total No. of UFRs installed RPC (State)

Total No. of df/dt relayss

installed

No. of df/dt

relays functional

State wise details of UFR (as on date )

Details of additional UFRs under

implementation/planned

Details of additional df/dt relays under

implementation/planned

RPC (State)State wise details of df/dt (as on date )

No. and details of petitions filed with CERC for non-compliance

of various regulations, issued under the act, by the states

Brief of petitionfiled in CERC Status of Petition

month and year to complete

the remedial action

action being taken to

make them functional

No. of UFRs

nonfunctional

No. of df/dt

relays

nonfunctional

action being taken to

make them functional

Month and year to complete

the remedial action

No. of UFRs

functional

22 22

Format -5 Real time Security Desk

Status Details of real time security desk

at each RLDC and NLDC

Status of development of faster

algorithm for real time updation

of TTC calculations by load

despatcher under outage

conditions

Implemented Provided in WRLDC control room

FORMAT - 6 (ADUIT OF HVDC, TCSC SVC AND PSS TUNING)

Location of HVDC Audit status (completed on

dd/mm/yyyy)

Observations of the aduit and the name of

audit agency

Action plan with timeline to

remove deficiencies as per

audit.

HVDC Chandrapur Not Yet Audited

Padghe Not Yet Audited

Guj

CG

MP

WR-I (PG)

BHADRAVATI HVDC

Back to Back22.01.2013 WR-II and WRLDC Representative No discrepancy Found.

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

Location of TCSC Audit status (completed on

dd/mm/yyyy)

Observations of the aduit and the name of

audit agency



audit.

Maha

Guj

CG

MP

WR-I (PG) Raipur TCSC 06.02.2013 WR-II and WRLDC Representative No discrepancy Found.

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

Location of SVC Audit status (completed on

dd/mm/yyyy)Observations of the aduit and the name of audit agency



audit.

Maha

Guj

CG

MP

WR-I (PG) NA NA NA NA

Details ofoutage scenarios built to be used by despatcher in real time for

revising TTC calculations

Seurity Desk person prepares the Base case in the moring as per the Load

generation balance on the day available from WRLDC SCADA. After that

Contigency ranking is done by PSS/E and accordingly top contigency is

performed. Also all the emergency outage simulation is performed for

making system N-1 secure after contingency.

(B) Audit of TCSC

(A) Audit of HVDC

Recommendation: 9.9.2.: An audit of devices such as HVDC, TCSC, SVC and PSS should be done immediately to enusre that their stability features

are enabled. Further exercise of PSS tuning should be planned and implemented. Settings of these dynamic stabilizing devices should be reviewed

at appropriate intervals. Action : CTU, STUs, Generators: Time Frame : 6 months.

( C) Audit of SVC

Maha

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

RPC (state wise)

Name and Location of

generator identified for PSS

tuning.

Audit status (completed on

dd/mm/yyyy)

Action plan with time line to complete PSS

tuning.Remarks

Maha 23

Guj

CG

MP

OSP 1

ISP 1

WR-I (PG) NA NA NA NA

WR-II (PG)

WR-I (NTPC)

WR-II (NTPC)

Constituents Station Unit No. Capacity (MW)

Gujarat Wanakbori TPS 1 210

Wanakbori TPS 3 210

Chattisgarh Korba (W) TPS 1 210

Korba (W) TPS 3 210

Korba (W) TPS 2 210

Madhya Pradesh Satpura STPS 8 210

Satpura STPS 9 210

SGTPS Birsinghpur 1 210




Maharashtra Nasik TPS 3 210

Nasik TPS 5 210

Parli TPS 2 210

Parli TPS 3 210

Parli TPS 4 210

NTPC Korba STPS 2 210

Korba STPS 3 210

Korba STPS 4 210

Korba STPS 5 500

Korba STPS 6 500

REL Dahanu TPS 1 250

Dahanu TPS 2 250

(D) Status of PSS Tuning

Format-7 Voltage collapse prediction relayStatus of exploration of voltage collapse prediction relay Action: RPCs, Time Frame: 1 year

Format-8 Telemetry facilities

POSOCO

(Region

/State/CPSU

Wise)

Fault in the telemetry / Reason

for non-availability of

telemetry(B)

Nature of the communication link

for required telemetry in

column(A)

(Microwave/FO/PLCC) C

Action plan with time line to

oerationalize the required

telemetry facility (D)

Bhatiya (3rd Trf.) 220 Not Integrated Yet

Mokha 220 Not Integrated Yet

MPPTCL CHICLI 220 Not Integrated Yet

DHAR 220 Not Integrated Yet

PANAGAR 220 Not Integrated Yet

Khaparkheda GS 500 Telemetry Not availble

Deepnagar GS 1000 Telemetry Not availbleWARORA 400

LONIKAND NEW 400

Taptitanda 400

GHATGHAR

400These stations are not availbale in

New SCADA and thus not

available at RLDC/NLDC

CHANDRAPUR 2

400These stations are not availbale in

New SCADA and thus not

available at RLDC/NLDC

HARANGUL 220

KDPH 220

KOLSHET 220

Recommendation :9.10.2: Possibility of voltage collapse prediction,sensing globalpower system conditions derived from local

measurements may be explored

Name and location of Generating

station / transmission element

without telemetry faclity (A)

GETCOSub-Station is ready but all lines

are under construction stage

MSETCL

Maharastra have informed that

they are taking up for alternate

communication system from

TTSL

StatusIn Boisar, A-eberlay Collapse Prediction relay was installed on 17 Oct,12 as a demo project. A-Eberle has now decommisoned these

relay.

Action: RPCs, Posoco, Time frame: 6 months

New Stations Added , Integration

still pending

Maharastra have informed

that they are taking up for

alternate communication

system from TTSL

LATUR 220

MAHAD 220

TEMGHAR 220

TILLARI 220

GHATGHAR 220Lokmangal Shugar

Ethanol, IPPYash Agro & Energy

Ltd., IPPGangakhed Sugar &

Energy Ltd., IPP

A A Energy, IPP

JSW Steel Ltd., IPPShree Sidhbali Ispat

Ltd, IPP

RPL Urja IPP

M/s ISMT Ltd. IPP

M/s Vasantrao Dada

Patil Sahakari Sakhar

Karkhana (SSK) Ltd. IPP

CSPTCL NIL NIL NIL NIL NIL

DD MAGARWAD 220 SCADA not Available PLCCNew RTU Envisaged in New

SCADA

KARARPAD220 kV SCADA not Available PLCC

New RTU Envisaged in New

SCADA

NEW KHARADPARA220 kV SCADA not Available PLCC


SCADA

SAYALI220 kV SCADA not Available PLCC


SCADA

KHADOLI220 kV SCADA not Available PLCC


SCADA

CUNCOLIM 220KV PLCC

AMONA 220KV PLCCGOA

To be done as part of new

SCADA

MSETCL


they are taking up for alternate

communication system from

TTSL


they are taking up with IPP for

integration

DNH

Maharastra have informed

that they are taking up for

alternate communication

system from TTSL

Maharastra has informed that 4

major IPP and 8 small IPP have

been integrated. The balance 18

small IPP in the state are taking up

for integration for complete grid

visibility

HCL

Typewritten text

Annexure 8

Documents

AGENDA OF 128 - wrpc.gov.in · PDF fileWork of locating DC earth leakage was taken up by substation staff by removing fuses of DC. ... Also at 400 kV Kansri-Ranchorpura 2 and 400 kV