SOUTHERN REGIONAL POWER COMMITTEE … REGIONAL POWER COMMITTEE BENGALURU Minutes of the Meeting of Protection System Analysis Group - 17 (PSAG-17) held on 3rd & 4th October, 2016 at

Minutes of the PSAG-17 Meeting held on 3rd & 4th October, 2016 Page 1

SOUTHERN REGIONAL POWER COMMITTEE BENGALURU

Minutes of the Meeting of Protection System Analysis Group - 17 (PSAG-17)

held on 3rd & 4th October, 2016 at NTPC-Simhadri STPS, Kalpaka SS, and HNPCL TPS

1. Introduction On 6th September, 2016, multiple trippings took place in Kalpaka – Gajuwaka – Hinduja NPCL – Simhadri

(KGHS) Corridor with Kalpaka as the epicentre. Though the triggering/ initiating cause was the failure of

the Y-ph limb of Circuit Breaker (CB) of Bus Reactor -3 (BR-3) at 400/ 220 kV Kalpaka SS of APTRANSCO,

certain anomalies had been observed in the protection system operation that became manifest in the

consequent multiple trippings in the transmission network adjoining Kalpaka SS. Major issues involved in

the incident were as follows:

Delayed clearance of fault during breaker failure of Bus Reactor - 3 at Kalpaka end.

Development of steep over voltage at Simhadri that resulted in tripping of Simhadri - Kalpaka

lines on operation of OVR, Stage-II protect ion.

Suspected over-reach of distance relays at Gajuwaka end that resulted in tripping of Gajuwaka-

Vijayawada line.

Improper Zone-2 settings for the lines emanating from Gajuwaka - Kalpaka - Simhadri – HNPCL

Corridor

Suspected mal-operation of RPD relay of Generator Transformer of Unit-1 of HNPCL

Non-implementation of line differential protection on the 400 kV transmission lines inter-

connecting various stations/ substations in the KGHS Corridor.

In the above context, NTPC-Simhadri had also requested to conduct the feasibility studies to effect

equitable distribution of power flows along their plant’s evacuation lines.

Keeping in view the importance of KGHS Corridor and the gravity of the issues involved, Member

Secretary (MS), SRPC had directed to convene a meeting of Protection System Analysis Group (PSAG-17)

to deal with all outstanding protection issues. Accordingly, a PSAG-17 team comprising Officials from

SRPC, SRLDC, KPTCL, KSEB, PGCIL (SRTS-I), APTRANSCO, NTPC, and HNPCL held their meeting on 3rd & 4th

October, 2016 at NTPC-Simhadri STPS, Kalpaka SS and HNPCL TPS, and made field visits to their Control

Rooms & Switchyards.

The List of Participants is enclosed at Annexure - I.

The Bus-level Connectivity Diagram tessellated with all involved stations/ substations & showing the

sequence of trippings that took place on 6th September, 2016 and the Single Line Diagrams of

400 kV NTPC-Simhadri STPS, 400/220 kV Kalpaka SS and 400 kV Hinduja TPS are enclosed at

Annexure-II.

Certain photic-information captured during the field visits of the stations/ substations involved is

enclosed at Annexure-X.


2. Single Line Diagram showing interconnections among 400/220 kV Gajuwaka SS, 220 kV VSS, 400 kV NTPC-Simhadri STPP, 400 kV Hinduja TPS during multiple trippings on 06.09.2016

3. Z1

STPP- Kalpaka-3

STPP- Kalpaka-2

Filters

ICT-1

Line reactor

Gajuwaka - Kalpakka-2

Jeypore-2

Gaj - Sim -1 Gaj - Sim-2

220kV Bus-1

Kalpaka - VSS-1

ICT-3 ICT-2 ICT-1

B/C-1 B/S-1

HNPCL-Kalpaka-2

Future (Kalpaka-1)

ST-1 GT-3 ST-2 GT-4

Vem-1 Vem-2 GT-2 GT-1 Standby

Transformer

400 kV SIMHADRI

ST-1 GT-1 GT-2 ST-2

HNPCL

Khammam-2

B/S-2

DF-1 DF-2 BR-1

400/ 220 kV KALPAKA

Pend-1 Pend-2 Pwd Kkd GGVM Gajuwaka

Kalpaka - VSS-2

220 kV VSS

Vijayawada 4. Z2

Filters Pole-1 Block

Filter Pole-2 Block Filters Jeypore-1


220kV Bus-2

South Bus-2

East Bus-1

East Bus-2

GAJUWAKA (HVDC & 400/ 220 kV HVAC)

ICT-2

400 kV Bus-3

Khammam-1

Vem-1

Vem-2

STPP- Kalpaka-4

BR-2

STPP- Kalpaka-1

400 kV Bus-4

South Bus-1

220kV Bus-1

220kV Bus-2

BR-2

BR-1

BR-3

Not in service

4. Z4 4. Z2 4. Z2

L/C 5. O/C

2. DT

2. DT

6. BBP

6. BBP

7. RPD

6. DT 3. Z2 (CAT)

OVR-II OVR-II

1

0

0

2. DT

2 2

5. O/C

400 kV Bus-1 400 kV Bus-2


3. Event Analysis 3.1 Kalpaka-Simhadri Line-2 Kalpaka (APTRANSCO) end:

As per FIR, line tripped at 16:43 hrs due to DT receipt from Simhadri end.

As per DR, line tripped at 16:44:14.479 hrs due to DT receipt from Simhadri end.

As per EL, line tripped at 16:43:37.398 hrs due to DT receipt from Simhadri end.

Time-sync of DR & EL with GPS needed to be ensured. Simhadri (NTPC) end:

As per FIR/EL/TR, line tripped at 16:43:46:043 hrs due to operation of OVR, Stage-II protection. However, OVR-Stage-II START event was not observed in EL. Only OVR, Stage-I START was observed at 16:43:45.931 hrs in EL.

DR not furnished to verify OVR, Stage-II operation. 3.2 Kalpaka-Simhadri Line-3: Kalpaka (APTRANSCO) end:

As per FIR, line tripped at 16:43 hrs due to BBP operation of 400 kV Bus-1. (Line-3 is on Bus-1).

As per EL, line observed to have got tripped at 16:43:37.423 hrs (some 400 msec prior to operation of BBP protection this could be due to DT receipt from Simhadri end). However, explicit DT receipt event for this line was not found in EL.

DR/ TR not furnished. Simhadri (NTPC) end:

As per FIR/DR/EL/TR, line tripped at 16:43:46:043 due to operation of OVR, Stage-II protection. However, OVR-Stage-II START event was not observed either in DR or EL. Only OVR, Stage-I start was observed at 16:43:45.931 hrs in both DR & EL. It was further observed from EL that DT receipt event was noted in both channels 1 & 2 at 16:43:46.547 hrs and 16:43:46.549 hrs respectively.

From DR, however, 100 msec time delay could be observed for OVR, Stage-II protection operation. 3.3 Kalpaka-Simhadri Line-4 Kalpaka (APTRANSCO) end:

As per FIR, line tripped at 16:43 due to DT receipt from Simhadri end.

As per EL, line tripped at 16:43:37.395 hrs due to DT receipt from Simhadri end.

DR/ TR not furnished. Simhadri (NTPC) end:

As per FIR/DR/EL/TR, line tripped at 16:43:46:043 hrs due to operation of OVR, Stage-II protection. However, OVR-Stage-II START event was not observed either in DR or EL. Only OVR, Stage-I start was observed at 16:43:45.931 hrs in both DR & EL.

From DR, however, 100 msec time delay could be observed for OVR, Stage-II protection operation. 3.4 Kalpaka- Simhadri Line-1: Kalpaka (APTRANSCO) end:

As per FIR, line tripped at 16:43 hrs on R-E fault due to operation of DPR, Zone-1.

As per DR, line tripped at 16:45:36.460 hrs on Y-E fault due to DPR, Z1 operation, severe fault currents and dip in voltages were observed in both Y & B-ph.

R-ph Voltage= 196.8 kV; Current= -0.910 kA Y-ph Voltage= -12.59 kV; Current= 14.15 kA B-ph Voltage= -125.1 kV; Current= 3.045 kA

As per Station EL, line tripped at 16:43:37.702 hrs and carrier was sent to other end at 16:43:37.702 hrs.

As per the line-specific EL, the distance relay detected a fault in Reverse-Zone at 16:28:48.633 hrs (with fault current of 3.70 In in Y-ph); then after another 420 msec, it sensed a Y-ph fault in forward direction in Zone-1. Due to this, A/R acted upon tripping the line in Y-ph at 16:28:49.055 hrs.

Time-sync of DR & EL with GPS needed to be ensured.


Simhadri (NTPC) end:

As per FIR/TR, line tripped (in Y-ph) at 16:43:46.266 hrs on Y-E fault due to DPR, Z1 operation. Main-I relay sensed the fault in Y ph DPR, Zone-I and AR was successful but tripped on pole discrepancy.

DR furnished was incorrect (No waveforms).

As per EL, Z2 start was observed; Carrier receipt was observed at 16:43:46.388 hrs; AR successful was observed at 16:43:47.290 hrs; and Pole Discrepancy Trip was observed at 16:43:47.882 hrs.

3.5 Kalpaka-Gajuwaka Line-1: Kalpaka (APTRANSCO) end:

As per FIR, line had not tripped at Kalpaka end. Gajuwaka (PGCIL-SR1) end:

As per FIR/TR, line tripped at 16:43 hrs on Y-E fault due to DPR, Z2 operation (with Z2 time = 500 msec).

As per DR, line tripped at 16:46:24.444 hrs on Y-E fault due to DPR, Z2 operation (with Z2 time = 500 msec). [Vy (ph) =41.88kV; Iy (ph) = 7.252 kA]

As per EL, line tripped at 16:43:46.454 hrs due to operation of Main-I & Main-II protections [Main-I’s GENERAL START was observed at 16:43:45.954 hrs and after about 500 msec, i.e., at 16:43:46.454 hrs MAIN-I PROTECTION TRIP was observed].

Time-sync of DR & EL with GPS needed to be ensured. 3.6 Kalpaka-Gajuwaka Line-2: Kalpaka (APTRANSCO) end:

As per FIR, line had not tripped at Kalpaka end. Gajuwaka (PGCIL-SR1) end:

As per FIR/TR, line tripped at 16:43 hrs on Y-E fault due to DPR, Z2 operation (with Z2 time = 500 msec).

As per EL, line tripped at 16:43:46.454 hrs due to operation of Main-I & Main-II protections [Main-I’s GENERAL START was observed at 16:43:45.954 hrs and after about 500 msec, i.e., at 16:43:46.454 hrs MAIN-I PROTECTION TRIP was observed].

DR not furnished (It was stated that DR was not available). 3.7 Gajuwaka-Vijayawada Line-1: Gajuwaka (PGCIL-SR1) end:

As per FIR/TR, line tripped at 16:43 hrs due to DPR, Z4 (Reverse zone) operation.

As per DR/EL, line tripped at 16:43:46.477 hrs. (with Z4 time = 500 msec)due to DPR, Z4 operation. Vijayawada (PGCIL-SR1) end:

As per FIR/TR, line tripped at 16:43 hrs due to DPR, Z2 operation.

As per DR, line tripped at 16:43:46.439 hrs due to DPR, Z2 operation (with Z2 time = 500 msec).

As per EL, line tripped at 16:44:01.091 hrs due to DPR, Z2 operation (with Z2 time = 500 msec).

Time-sync of DR & EL with GPS needed to be ensured. 3.8 Gajuwaka ICT-1 (PGCIL-SR1):

As per FIR/EL/TR, ICT-1 tripped at 16:43:46.607 hrs due to operation of Directional O/C and E/F protections.

DR not furnished. 3.9 Kalpaka ICT-1 (APTRANSCO):

As per FIR, line tripped at 16:43 hrs due to BBP operation of 400 kV Bus-1.

As per EL, line tripped at 16:43.37.855 hrs due to BBP operation of 400 kV Bus-1.

DR/ TR not furnished. 3.10 Kalpaka-Vemagiri Line-1: Kalpaka (APTRANSCO) end:



As per DR, line tripped at 16:45:28.318 hrs due to BBP operation. [Vy (ph) = 21.44 kV and Iy (ph) = 2.853 kA; a delay of 600 msec had been observed from the instant of fault occurrence to BBP operation.]

As per EL, line tripped at 16:43:37.881 hrs due to BBP operation of 400 kV Bus-1.

Time-sync of DR & EL with GPS needed to be ensured. Vemagiri (APTRANSCO) end:

As per FIR/ DR/EL, line tripped at 16:43:27.176 hrs due to DT receipt from Kalpaka end.

Furnished EL was not proper. 3.11 Kalpaka-HNPCL Line-1: Kalpaka (APTRANSCO) end:


As per DR, line tripped at 16:43:48.020 hrs. (It was observed that there was sudden decrease in all phase currents at 16:43.47.650 hrs; also Z4 elements got reset at this instant)

In EL, no events corresponding to this line trip were observed. (EL needed to be configured/triggered for HNPCL events)

HNPCL end:

As per TR/DR, line tripped at 16:43:32.075 hrs due to DT receipt from Kalpaka end.

EL not furnished.

It was also stated in TR that Unit-I’s GT tripped at 16:43 hrs due to operation of PRD relay.

Unit-I’s tripping details (DR & EL) not furnished.

4. Event Anatomy

As the necessary files like DR & EL for all involved trippings had not been furnished (ostensibly due to non-

availability or non-triggering of the same), the anatomy/ dissection of the Event had to be based on the

limited information made available as brought out at Item No. 3. Further, as the time-synchronization of

almost all stations’ DR’s & EL’s was found to be not in order, the sequence construction was chiefly based on

the relative time difference between the starting & ending tripping events (roughly around 550 msec), and

duly supplemented by the deliberations of the Committee. Since Kalpaka SS was the focal point for all

tripping events, it’s Stand-alone EL and line-specific EL’s (Annexure - III) had been used in tandem with

other stations’ EL’s to zero in on the underlying pattern and arrive at the most plausible explanation for the

sequence of events as given below:

Sl.

No.

Element Line Length (km)/

Type of Conductor

From end To end

1 Kalpaka –Simhadri line-2 3.72/ Twin Moose DT OVR-II

2 Kalpaka –Simhadri line-3 3.72/ Twin Moose DT (conclusion from EL) OVR-II

3 Kalpaka –Simhadri line-4 3.72/ Twin Moose DT OVR-II

4 Kalpaka –Simhadri line-1 3.72/ Twin Moose Z1 Z2 [CAT] (Y-ph);

PDR (R-ph; B-ph)

5 Kalapaka-Gajuwaka line-1 3.39/ Twin Moose Not Tripped Z2


7 Gajuwaka-Vijayawada line-1 316.9/ Twin Moose Z4 Z2

8 Gajuwaka ICT-1 --- O/C Relays

9 Kalpaka ICT-1 --- BBP operation

10 Kalpaka-Vemagiri Line-1 166.93/ Twin

Moose

BBP operation DT

11 Kalpaka-HNPCL Line-1 7.35/ Twin Moose BBP operation DT

12 Unit-I’s GT --- PRD Relay


It all started with the failure of the Y-ph limb of the Circuit Breaker (CB) of the Bus-Reactor – 3 (BR-3) of

400/ 220 kV Kalpaka SS at 16:43:37.293 hrs resulting in blasting of BR-3 side Interruptor of the CB and

falling down of the Connecting Conductor to BR-3, and ended in about 550 – 600 msec with the touching

of the broken Connecting Conductor to the adjacent Pole/ supporting structure. (Snapshots 9-12 of

Annexure – X may please be referred to).

The above failure (opening of Y-ph) resulted in the occurrence of neutral current that was kept sustained

from R & B phases, and caused sudden rise in phase currents, and immediately caused the following:

Picking up of the distance relays in Reverse Zone at Kalpaka end and in Zone-2 at Simhadri end on

Kalpaka – Simhadri lines 1 & 2 & 3 & 4.

Picking up of the Over Voltage Relays in Stage-II at Simhadri end on Kalpaka - Simhadri lines 2, 3 & 4.

Picking up of the distance relays in Zone-2 at Gajuwaka end on Gajuwaka – Kalpaka lines 1 & 2.

Picking up of the distance relays in Zone-2 at Vijayawada end & in Zone-4 at Gajuwaka end on

Vijayawada - Gajuwaka line.

Owing to sudden rise in Voltage at Simhadri end, Kalpaka – Simhadri lines 2 & 3 & 4 tripped from

Simhadri end in about 100 msec due to operation of OVR, Stage-II protection. The tripping of these lines

effectively shifted their contribution to BR-3 neutral current on to Simhadri – Kalpaka line-1. This event

also resulted in over-loading of 400/ 220 kV ICT-1 at Gajuwaka SS.

At about 420 msec from the instant of breaker failure, a Y-E fault occurred on Kalpaka – Simhadri line-1,

which was sensed by distance relays in Zone-1 at Kalpaka end and in Zone-2 at Simhadri, and resulted in

opening of the line (in Y-ph) due to A/R operation with sending of the Carrier from Kalpaka to Simhadri

end. It was noted that while the line had been opened on A/R operation from both the ends, the line did

not auto-reclose at Simhadri end owing to non-transmission of closing command to CB’s closing coil on

account of VT fuse fail. As such, the other two (R & B) phase poles got opened on PDR operation. At

Kalpaka end, before the line could auto-reclose, BBP operation took place to open the other two phase

poles of the CB.

Now, as Zone-2 and Zone-4 time settings had been set at 500 msec, Gajuwaka – Vijayawada line,

Gajuwaka – Kalpaka lines 1 & 2 tripped after elapse of 500 msec from the instant of breaker failure

(Connectivity Diagram may please be referred to in this regard). The tripping of these lines in turn led to

tripping of ICT-1 at Gajuwaka SS due to operation of O/C protection.

Then as the broken Connecting Conductor was about to hit the adjacent pole (at around 550 msec from

the instant of breaker failure), it caused simultaneous arcing directly between Connecting Conductor and

ground as well as between Bus-side Interruptor of the Breaker (which incidentally remained intact during

the event) and the ground across CB’s insulator housing (thus effectively creating a solid bus fault) as

shown in the following figure.

This solid bus fault caused in instantaneous operation of Busbar Protection on Kalpaka 400 kV Bus-1, and

resulted in tripping of all connected elements viz., B/C CB-1, B/S CB-1, 400/ 220 kV ICT-1, Hinduja line,

and Vemagiri line-1. During this event, DT had also been sent to the remote ends, namely Vemagiri and

Hinduja as per the configured BBP logic.


Around the same time as the tripping of the Hinduja – Kalpaka line, Rapid Pressure Detecting Relay of Generator Transformer (GT) of Unit-I acted upon resulting in opening up of GT’s breakers.

5. Recommendations

5.1 Revision of Bus Bar Protection (BBP) relay’s settings & Reasons for Breaker failure

The settings adopted for BBP relay on the day of occurrence of faults were 0.9 A with a Slope of 0.8. It

was observed that even though BBP relay ultimately acted instantaneously on solid bus fault (created

artificially due to the arcing as brought out above), even immediately after Y-ph limb of the CB got

broken, the current flowing through the BR-3’s neutral was on the higher side due to grounding of 400

kV Bus Section – 1 through BR-3’s R- & B phase reactances. Though these were sensed by far end

distance relays, BBP relay remained immune to them. APTRANSCO/ Kalpaka was therefore

recommended to revise the existing BBP relay settings at 400 kV Kalpaka suitably to take care of such

high flowing currents.

Similarly, it was observed that the Circuit Breaker (of Bus Reactor – 3), which got failed, had completed

only a few cycles of operation. As such, APTRANSCO was recommended to take up the issue with its

OEM and furnish a report on the reasons for premature failure of the CB.

5.2 Development of sudden & steep Over Voltage on Simhadri – Kalpaka lines 2 & 3 & 4 at

Simhadri end

It was seen that development of steep over voltages at Simhadri end on Simhadri –Kalpaka lines had

occurred simultaneously with the failure of Y-ph limb of breaker of BR-3 at Kalpaka SS and consequent

rise in the neutral current. In this regard, it was noted that NTPC Simhadri has a practice of providing

multiple earthing to line CVT’s (in the switchyard as well as in the control panel). On this, KPTCL

Towards Bus Reactor-3 Towards BUS-1

Y-ph Limb of Circuit Breaker Adjacent Pole


representative correlated with similar incidents that had occurred at UPCL, when they found out

multiple earthing of line CVT’s to be the cause for sudden rise in line voltages on their tripping. Minutes

of the meeting dated 01.12.2015 M/s KPTCL had with UPCL in this regard are enclosed at

Annexure - IV for kind reference.

As this practice of providing single secondary earthing of line CVT’s was also in line with CBIP guidelines,

NTPS-Simhadri was therefore recommended to remove multiple earthing for the secondaries of the

CVT’s protection cores by opening the earth link provided to the neutral in the relay panel, and

retaining the neutral earthing of CVT secondary only at switchyard end.

NTPC-Simhadri also informed that as a remedial action they had changed OVR setting from ‘Normal’ to

‘DFT mode’ to consider only fundamental frequency component of Voltage input.

5.3 Provision of external Auto-Reclose (A/R) relays on Kalpaka bound lines at Simhadri STPS

(Stage-I)

It was seen that while A/R functionality had been provided in BCU’s on all lines emanating from

Simhadri Stage-II, same was not the case with Kalpaka bound lines emanating from Simhadri Stage-I. As

A/R functionality was not available in the existing BCU’s at Simhadri, Stage-I, the same had been

implemented from one of the two Main relays. The disadvantage with such a scheme came to the fore

in the instant case with the tripping of Simhadri – Kalpaka line-1, when A/R remained unsuccessful due

to VT fuse fail event for the Main-II (REL316) relay from which it had been implemented.

It was therefore recommended that NTPC-Simhadri take steps to provide an external A/R relay or

incorporate A/R functionality in the existing BCU’s for each of the Kalpaka bound lines from Simhadri,

Stage-I STPS.

5.4 Suspected over-reach of the distance relay at Gajuwaka end on Gajuwaka – Vijayawada line

It was seen that even though the breaker failure was at Kalpaka end, the distance relay at Gajuwaka end

on Gajuwaka – Vijayawada line sensed it in Zone-4 (Reverse) and tripped the line after the elapse of its

time setting of 0.5 sec.

In this regard, Ramakrishna Committee guidelines for reverse zone settings were noted as follows:

Reactance reach To be set appropriately at a value less than the Zone-1 (reactance) reach of

the shortest line connected to the bus

Resistance reach To be kept similar to Zone-3 Resistive reach setting

Time Setting To be kept similar to / coordinated with Zone-2 time settings

From above, it can be seen that Gajuwaka end distance relay had overreached for its reverse zone

operation. It was therefore recommended that PGCIL (SRTS-I) suitably revise Zone-4 (reverse) reach

setting for these relays so that Kalpaka SS would not fall in its zone of operation. While setting this,

reduction in the effective reactance (by virtue of Gajuwaka’s double circuit connection to Kalpaka)

offered to Gajuwaka end distance relays on Gajuwaka – Vijayawada line for their reverse zone operation

shall be factored into.


5.5 Improper Zone-2 time settings for the lines emanating from Gajuwaka - Kalpaka - Simhadri –

HNPCL Corridor

As per Ramakrishna Committee guidelines, a Zone-2 timing of 0.35 seconds (considering LBB time of 200

mSec, CB open time of 60 ms, resetting time of 30 ms and safety margin of 60 ms) is recommended.

However, if a long line is followed by a short line, then a higher setting (typically 0.5 – 0.6 second) may

be adopted on long line to avoid indiscriminate tripping through Zone-2 operation on both lines.

In the instant case, it was seen that Gajuwaka – Kalpaka lines 1 & 2 (of length 3.39 km) had not tripped

from Gajuwaka end due to the wrongly kept time setting of 0.5 sec. Even though this error was

subsequently rectified by PGCIL (SR-I) with the concurrence from APTRANSCO (the asset belongs to

APTRANSCO), it was recommended that PGCIL, NTPC, APTRANSCO, and HNPCL ensure that they had

kept Zone-2 time setting of 0.35 sec on all short lines; and in cases of long line followed by a short line,

the same had been kept at a higher value (typically 0.5 – 0.6 sec) on long lines to avoid indiscriminate

tripping through Zone-2 operation on both lines.

5.6 Suspected mal-operation of RPD of Generator Transformer of Unit-1 of HNPCL

It was noted that tripping of CB’s of Generator Transformer (GT) of Unit-1 was due to mal-operation of

Rapid Pressure Detecting (RPD) relay mounted on the GT. It was recommended that HNPCL configure

RPD relays for ALARM only instead of tripping (due to their sensitive nature), as other protection relays

like Oil Surge and Pressure Relieving relays would come to the rescue of GT in the event of genuine

excessive oil levels/ gas formation.

5.7 Provision of Line differential Protection on all 400 kV transmission lines interconnecting

Gajuwaka SS (PGCIL-STRS1), Simhadri STPS (NTPC), Kalpaka SS (APTRANSCO), and Hinduja TPS

(HNPCL)

It can be seen that all 400 kV interconnecting lines between/ among Simhadri STPS, Kalpaka SS,

Gajuwaka SS, HNPCL TPS are very short lines, all of length less than 10 km. In addition to the short

lengths, power-flow quotient of these transmission lines is also quite high on account of the fact that

this corridor is being used to (i) import power to the extent of 1000 MW from the eastern region, and to

evacuate power from Simhadri STPS (2000 MW) and Hinduja TPS (1040 MW). The huge stakes involved

can also be gauged from the fact that any inadvertent tripping of these inter-connecting lines could

have damning/ negative effect on the power supply to the districts of North Coastal Andhra

Pradesh.

Keeping all these factors in view, SRPC in their Special Meeting held on 04.05.2016 with NTPC,

APTRANSCO & HNPCL had recommended implementing line differential protection on all 400 kV

transmission lines inter-connecting Gajuwaka SS, Kalpaka SS, Simhadri STPS, and Hinduja TPS. The same

is reiterated now; accordingly PGCIL (SRTS-I), APTRANSCO, NTPC, and HNPCL are strongly

recommended to take steps to provide line (current) differential protection as outlined below on all

400 kV transmission lines inter-connecting Gajuwaka SS, Kalpaka SS, Simhadri STPS, and Hinduja TPS.

“Line differential protection is to be provided as both Main-I & Main-II protection with

distance protection as backup (built-in feature of Main relay or standalone relay). The

Zone-1 of such back-up distance protection would be normally in disabled condition, and

would get automatically activated/ enabled in the event of communication link failure


(i.e., when line differential protection goes off) to offer primary protection. The Zone-2 &

Zone-3 & Zone-4 (reverse) of the back-up distance protection will always be kept

enabled to offer back-up protection."

5.8 Provision of Substation Maintenance Equipment (SME)

During the field visit to 400/ 220 kV Kalpaka SS of APTRANSCO, it was noted that the substation was not

having the mandated SME like Dynamic Contact Resistance Measurement (DCRM) Kit, Portable Primary

Injection (PPI) Test Kit. Considering the importance of this Substation along with VSS in the region in

providing fail-safe power supply, it was recommended that APTRANSCO shall take steps to provide

DCRM and PPI Test Kits (to be housed/ stationed at 400/ 220 kV Kalpaka SS) for maintaining the

proper upkeep of these substations. Further, as already brought out in minutes of the Special Meeting

held on 04.05.2016, APTRANSCO shall also take steps to provide a separate Thermo-Vision Scanning

Camera (to be housed/ stationed at 400/ 220 kV Kalpaka SS) to attend hot-spots on the transmission

lines & substation equipment in time.

5.9 Provision of GPS/ Time synchronization facility in all 220 kV & above substations/ generation

switchyards in Gajuwaka – Simhadri – Kalpaka Corridor

The importance of GPS or time synchronization facility in the substation/ switchyard cannot be over-

emphasized considering the role it plays in harmonising the station-specific events with the pan-Indian

power network, and the accountability & discipline it brings in the way the power system network is

operated at sub-station level. Further this is also one of the recommendations given by the Enquiry

Committee constituted by Min. of Power that took stock of the factors that led to grid disturbances in

North India on 30-31 July, 2012.

In this connection, it was noted that Gajuwaka SS of PGCIL, Hinduja TPS of HNPCL, and Simhadri STPS of

NTPC already had this facility. However, time-synchronization of their stations’ DR’s & EL’s with GPS was

not found to be in order. As such NTPC, PGCIL (SR-I) and HNPCL were recommended to ensure proper

time-synchronization.

APTRANSCO informed that provision for the same had been included in the DPR of the APTRANSCO

substations identified for R&M works. In this regard, it was pointed out as provision of GPS does not

present a problem either from cost point of view or time needed for implementation point of view; as

such it was recommended that APTRANSCO would provide GPS/ Time synchronization facility in all

their 220 kV & above substations in Gajuwaka – Simhadri – Kalpaka Corridor at the earliest.

5.10 Nomenclature for naming various files to be uploaded in web-based Tripping Monitoring

System of SRLDC Portal

The nomenclature to be followed by the Constituents in naming various files (FIR, DR, EL, TR)

corresponding to a tripping incident was brought out in the SRPC letter No. SRPC/ SE-III/ PCSC-45/ 4609

– 649 dated 26.06.2015 and in the minutes of PCSC-45 issued vide SRPC letter No. SRPC/SE-III/ PCSC-45/

2015/ 5422-455 dated 21.07.2015. As illustrated therein, the format to be followed for the user entered

part-name is given below:


Transmission Element

File Name to be given by the user

Transmission Line

SSN_DSN_line#_FT

Inter-connecting Transformer

SSN_ICT#_FT

Generating Transformer

SSN_GT#_FT

Generating Unit

SSN_Unit#_FT

Where, SSN = Source Station Name/ From end Station Name/ Sending end Station Name

DSN = Destination Station Name/ To end Station Name/ Receiving end Station Name

FT = File Type (FIR/ DR/ EL/ TR)

NTPC, PGCIL (SRTS-I), APTRANSCO, HNPCL were requested to kindly intimate the above file naming

nomenclature to all the concerned and ensure that it was strictly followed at all the stations in their

respective control area so that tripping analysis could be performed systematically.

6. System Studies System Studies carried out and presented in the meeting can be broadly divided into two Parts: A. Study results pertaining to multiple trippings in Kalpaka – Gajuwaka – HNPCL – Simhadri (KGHS) Corridor

on 6th September, 2016 B. Study results pertaining to power evacuation from Kalpaka – Gajuwaka – HNPCL – Simhadri (KGHS)

Corridor

The tabulated Study Results including Analysis & Conclusions are enclosed at Annexure – V.

The supporting Diagrams for the various scenarios considered are enclosed at Annexure – VI.

7. Control Room & Switchyard visit of NTPC-Simhadri STPS, Kalpaka SS and Hinduja TPS, Filed visit to Control Room & Switchyard of NTPC-Simhadri STPS, Kalpaka SS, and HNPCL TPS had been under

taken to get a first-hand information of the adopted relay settings & protection practices being fallowed.

In this regard, the filled-in data formats of NTPC-Simhadri STPS (Annexure - VII), Kalpaka SS

(Annexure – VIII) and Hinduja TPS (Annexure - IX) are enclosed for kind reference.

8. Acknowledgements

PSAG Team gratefully acknowledges the efforts put in by NTPC-Simhadri [esp. Sh. A. Maiti, GM (MTC) and Sh.

C. Malakondaiah, AGM (EMD) and Sh. V.V.R. Murthy, AGM (EMD)] in hosting PSAG-17 meeting.

PSAG Team also thankfully acknowledges the cooperation extended by all Constituents, namely, NTPC,

APTRANSCO, and HNPCL in facilitating the smooth conduct of PSAG-17 meeting.

*****

Annexure-I

Annexure-I

" Protection System Analysis Group (PSAG-17) Meeting;

NTPC-Simhadri, Visakhapatnam 04.10.2016

LIST OF PARTICIPANTS

S.NO. NAME IN CAPITAL LETTERS DESIGNATION ORGANISATION SIGNATURE E-Mail ID (Please write legibly toContact Numbercommunicate in future)

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~ ~18

Annexure-I

Single Line Diagram showing interconnections among 400/220 kV Gajuwaka SS, 220 kV VSS, 400 kV NTPC-Simhadri STPP, 400 kV Hinduja TPS during multiple trippings on 06.09.2016

3. Z1

STPP- Kalpaka-3

STPP- Kalpaka-2

Filters

ICT-1

Line reactor


Jeypore-2

Gaj - Sim -1 Gaj - Sim-2

220kV Bus-1

Kalpaka - VSS-1

ICT-3 ICT-2 ICT-1

B/C-1 B/S-1

HNPCL-Kalpaka-2

Future

(Kalpaka-1)

ST-1 GT-3 ST-2 GT-4

Vem-1 Vem-2 GT-2 GT-1 Standby

Transformer

400 kV SIMHADRI

ST-1 GT-1 GT-2 ST-2

HNPCL

Khammam-2

B/S-2

DF-1 DF-2 BR-1

400/ 220 kV KALPAKA

Pend-1 Pend-2 Pwd Kkd GGVM Gajuwaka

Kalpaka - VSS-2

220 kV VSS

Vijayawada

4. Z2

Filters Pole-1

Block

Filter Pole-2

Block Filters Jeypore-1


220kV Bus-2

South Bus-2

East Bus-1

East Bus-2

GAJUWAKA

(HVDC & 400/ 220 kV HVAC)

ICT-2

400 kV Bus-3

Khammam-1

Vem-1

Vem-2

STPP- Kalpaka-4

BR-2

STPP- Kalpaka-1

400 kV Bus-4

South Bus-1

220kV Bus-1

220kV Bus-2

BR-2

BR-1

BR-3

Not in

service

4. Z4 4. Z2 4. Z2

L/C 5. O/C

2. DT

2. DT

6. BBP

6. BBP

7. RPD

6. DT 3. Z2

(CAT) OVR-II OVR-II

1

0

0

2. DT

2 2

5. O/C

400 kV Bus-1 400 kV Bus-2

Annexure-II

Annexure-II

,! -

6 t ai\

,t

"'

s2 t; t5 t: lo t> : IN t; ts q l6 lz ta IF F lf

E-g

ia

-o

_ 9- s q\ .D B ]: ;

li

F - e = F

a

?5

SG

EP

F$

IF;-

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$l:

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I

a

a

=

Annexure-II

Annexure-II

Annexure-II

S/W;Date&Time;TimeInvalid;ObjectType;ObjectText;ValueText;ValueQualifier;

EventClass;AlarmClass;AlarmTransition;AlarmTransitionColor

W;06-09-2016 17:30:45.704;;SPI;KALPAKA 400KVBAY-8 ICT-2 DC SUPPLY

AUTO CH. OVER;OFF;;1;1;3;;




AUTO CH. OVER;ON;;1;1;1;102-102-255;


AUTO CH. OVER;ON;;1;1;1;102-102-255;

W;06-09-2016 17:16:01.973;;SPI;KALAPAKA400KV BAY-6 STPP-3 CB B-PH

CLOSED;ON;;1;1;3;;

W;06-09-2016 17:16:01.966;;SPI;KALAPAKA400KV BAY-6 STPP-3 CB Y-PH

CLOSED;ON;;1;1;3;;

W;06-09-2016 17:16:01.964;;SPI;KALAPAKA400KV BAY-6 STPP-3 CB R-PH

CLOSED;ON;;1;1;3;;

W;06-09-2016 17:14:44.392;;SPI;KALAPAKA220KV BAY-4 ICT-1 LV CB Y-

PH CLOSED;ON;;1;1;3;;

W;06-09-2016 17:14:44.392;;SPI;KALAPAKA220KV BAY-4 ICT-1 LV CB R-


W;06-09-2016 17:14:44.387;;SPI;KALAPAKA220KV BAY-4 ICT-1 LV CB B-


W;06-09-2016 17:14:27.874;;SPI;KALAPAKA400KV BAY-7 ICT-1 HV CB B-


W;06-09-2016 17:14:27.870;;SPI;KALAPAKA400KV BAY-7 ICT-1 HV CB

Y-PH CLOSED;ON;;1;1;3;;


R-PH CLOSED;ON;;1;1;3;;

W;06-09-2016 17:12:10.976;;SPI;KALAPAKA400KV BAY-10 VMG-1 CB R-PH

CLOSED;ON;;1;1;3;;

W;06-09-2016 17:12:10.974;;SPI;KALAPAKA400KV BAY-10 VMG-1 CB B-PH

CLOSED;ON;;1;1;3;;

W;06-09-2016 17:12:10.972;;SPI;KALAPAKA400KV BAY-10 VMG-1 CB Y-PH

CLOSED;ON;;1;1;3;;

W;06-09-2016 17:10:23.464;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB

TRIP CKT -1 FAULTY;OFF;;1;1;3;;


TRIP CKT-2 FAULTY;OFF;;1;1;3;;

W;06-09-2016 17:10:23.381;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB B-



TRIP CKT-2 FAULTY;ON;;1;1;1;102-102-255;


TRIP CKT -1 FAULTY;ON;;1;1;1;102-102-255;


TRIP CKT-2 FAULTY;OFF;;1;1;3;;

W;06-09-2016 17:10:22.921;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB R-


W;06-09-2016 17:10:22.919;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB Y-



TRIP CKT-2 FAULTY;ON;;1;1;1;102-102-255;


OPERATIAON LOCK OUT;OFF;;1;1;3;;

Annexure-III

Page 1 of 9


OPERATIAON LOCK OUT;ON;;1;1;1;102-102-255;


DC SUPPLY-1/2 FAIL;OFF;;1;1;3;;






DC SUPPLY-1/2 FAIL;ON;;1;1;1;102-102-255;










DC SUPPLY-1/2 FAIL;OFF;;1;1;3;;






DC SUPPLY-1/2 FAIL;ON;;1;1;1;102-102-255;





W;06-09-2016 17:09:47.310;;SPI;KALPAKA 220KVBAY-4 ICT-1 LV GR-A/B

3 PH PROTN. TRIP;OFF;;1;1;3;;

W;06-09-2016 17:08:12.915;;SPI;KALPAKA 400KVBAY-14 STPP-1 LOW AIR

PRESSURE ALARAM;OFF;;1;1;3;;





W;06-09-2016 17:05:44.524;;SPI;KALPAKA 400KVBAY-3 BC-1 CB B-PH

CLOSED;ON;;1;1;1;102-102-255;

W;06-09-2016 17:05:44.523;;SPI;KALPAKA 400KVBAY-3 BC-1 CB Y-PH

CLOSED;ON;;1;1;1;102-102-255;

W;06-09-2016 17:05:44.521;;SPI;KALPAKA 400KVBAY-3 BC-1 CB R-PH

CLOSED;ON;;1;1;1;102-102-255;

W;06-09-2016 17:05:22.351;;SPI;KALPAKA 400KVB/B SEC-1 BAY-11A

TRIP RELAY OPERATED;OFF;;1;1;3;;

W;06-09-2016 17:05:22.351;;SPI;KALPAKA 400KVB/B SEC-1 BAY-3








Annexure-III

Page 2 of 9





W;06-09-2016 17:04:43.918;;SPI;KALPAKA 400KVB/B SEC-1 BUS-T1 CT

CKT DEFECT/RELAY BLOCK;OFF;;1;1;3;;


CKT DEFECT/RELAY BLOCK;ON;;1;1;1;102-102-255;

W;06-09-2016 17:04:38.611;;SPI;KALPAKA 400KVB/B SEC-1 BUS-1 CT












W;06-09-2016 16:58:06.256;;SPI;KALAPAKA400KV BAY-13 STPP-2 BROKEN

CONDUCTOR PROTN.;OFF;;1;0;0;;


CONDUCTOR PROTN.;ON;;1;0;0;;


CLOSED;ON;;1;1;3;;


CLOSED;ON;;1;1;3;;


CLOSED;ON;;1;1;3;;

W;06-09-2016 16:57:41.409;;SPI;KALAPAKA400KV BAY-13 STPP-2 MAIN-1/2

POWER SWING BLOCK;OFF;;1;0;0;;

W;06-09-2016 16:57:41.220;;SPI;KALAPAKA400KV BAY-13 STPP-2 MAIN-1/2

POWER SWING BLOCK;ON;;1;0;0;;




CONDUCTOR PROTN.;ON;;1;0;0;;

W;06-09-2016 16:56:01.640;;SPI;KALPAKA 400KVBAY-14 STPP-1 LOW AIR

PRESSURE ALARAM;ON;;1;1;1;102-102-255;

W;06-09-2016 16:56:01.574;;SPI;KALPAKA 400KVBAY-14 STPP-1 CB TRIP

CKT-2 FAULTY;OFF;;1;1;3;;




CLOSED;ON;;1;1;3;;


CLOSED;ON;;1;1;3;;


CKT-1 FAULTY;ON;;1;1;1;102-102-255;


CKT-2 FAULTY;ON;;1;1;1;102-102-255;


CLOSED;ON;;1;1;3;;

Annexure-III

Page 3 of 9

W;06-09-2016 16:55:40.917;;SPI;KALPAKA 400KVBAY-14 STPP-1 GR-B 3

PH PROTN.TRIP;OFF;;1;0;0;;

W;06-09-2016 16:55:39.544;;SPI;KALPAKA 400KVBAY-14 STPP-1 GR-A 3


W;06-09-2016 16:54:33.775;;SPI;KALPAKA 400KVBAY-14 STPP-1 DT CH-2

RECEIVED;OFF;;1;0;0;;




CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:54:33.044;;SPI;KALPAKA 400KVBAY-14 STPP-1 GR-B 3

PH PROTN.TRIP;ON;;1;0;0;;

W;06-09-2016 16:54:33.040;;SPI;KALPAKA 400KVBAY-14 STPP-1 GR-A 3



RECEIVED;ON;;1;0;0;;



W;06-09-2016 16:53:03.950;;SPI;KALAPAKA400KV BAY-5 STPP-4 GR-B 3


W;06-09-2016 16:53:02.731;;SPI;KALAPAKA400KV BAY-5 STPP-4 GR-A 3



CLOSED;ON;;1;1;3;;


CLOSED;ON;;1;1;3;;


CLOSED;ON;;1;1;3;;






CLOSED;ON;;1;1;3;;


CLOSED;ON;;1;1;3;;


CKT-1 FAULTY;ON;;1;1;1;102-102-255;


CKT-2 FAULTY;ON;;1;1;1;102-102-255;


CLOSED;ON;;1;1;3;;

W;06-09-2016 16:49:37.866;;SPI;KALAPAKA400KV BAY-13 STPP-2 GR-A/B

3 PH PROTN.TRIP;OFF;;1;0;0;;


AUTO CH. OVER;ON;;1;1;1;102-102-255;


AUTO CH. OVER;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:56.396;;SPI;KALPAKA 400KVBAY-9 VMG-2 CARRIER

PROTN. CH-1/2 FAIL;OFF;;1;1;3;;

Annexure-III

Page 4 of 9

W;06-09-2016 16:43:51.247;;SPI;KALPAKA 400KVBAY-9 VMG-2 CARRIER

PROTN. CH-1/2 FAIL;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:39.919;;SPI;KALAPAKA400KV BAY-13 STPP-2 DT CH-2








W;06-09-2016 16:43:38.079;;SPI;KALPAKA 220KVBAY-3 VSS2 POWER

SWING BLOCK;OFF;;1;1;3;;

W;06-09-2016 16:43:37.989;;SPI;KALPAKA 220KVBAY-3 VSS2 POWER

SWING BLOCK;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.959;;SPI;KALPAKA 400KVB/B SEC-1 MAIN BUS-

1 R-PH PROTN OPTD;OFF;;1;1;3;;


1 Y-PH PROTN OPTD;OFF;;1;1;3;;

W;06-09-2016 16:43:37.950;;SPI;KALAPAKA400KV BAY-16 KMM-2 MAIN-2

CVT FUSE FAIL;OFF;;1;1;3;;

W;06-09-2016 16:43:37.940;;SPI;KALAPAKA400KV BAY-17 KMM-1 MAIN-1/2

CVT FUSE FAIL;OFF;;1;1;3;;


1 B-PH PROTN OPTD;OFF;;1;1;3;;

W;06-09-2016 16:43:37.914;;SPI;KALPAKA 400KVBAY-24 PGCIL-2 MAIN-1

CARRIER RECEIVE;OFF;;1;0;0;;

W;06-09-2016 16:43:37.896;;SPI;KALAPAKA220KV BAY-4 ICT-1 LV CB Y-

PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.895;;SPI;KALAPAKA220KV BAY-4 ICT-1 LV CB B-

PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.895;;SPI;KALAPAKA220KV BAY-4 ICT-1 LV CB R-

PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.885;;SPI;KALAPAKA400KV BAY-10 VMG-1 CB Y-PH

CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.884;;SPI;KALAPAKA400KV BAY-10 VMG-1 CB B-PH

CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.883;;SPI;KALPAKA 220KVBAY-4 ICT-1 LV GR-A/B

3 PH PROTN. TRIP;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.883;;SPI;KALPAKA 400KVBAY-3 BC-1 CB Y-PH

CLOSED;OFF;;1;1;3;;

W;06-09-2016 16:43:37.881;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB B-

PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.881;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB Y-

PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.881;;SPI;KALAPAKA400KV BAY-10 VMG-1 CB R-PH

CLOSED;OFF;;1;1;1;102-102-255;


Y-PH CLOSED;OFF;;1;1;1;102-102-255;


R-PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.880;;SPI;KALAPAKA400KV BAY-11A BUS SEC-1 CB R-

PH CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.880;;SPI;KALAPAKA400KV BAY-7 ICT-1 HV CB B-

PH CLOSED;OFF;;1;1;1;102-102-255;

Annexure-III

Page 5 of 9

SRPC

Highlight

SRPC

Highlight

W;06-09-2016 16:43:37.879;;SPI;KALPAKA 400KVBAY-3 BC-1 CB B-PH

CLOSED;OFF;;1;1;3;;

W;06-09-2016 16:43:37.879;;SPI;KALPAKA 400KVBAY-3 BC-1 CB R-PH

CLOSED;OFF;;1;1;3;;


TRIP RELAY OPERATED;ON;;1;1;1;102-102-255;







W;06-09-2016 16:43:37.869;;SPI;KALPAKA 400KVB/B SEC-1 BAY-11A





1 B-PH PROTN OPTD;ON;;1;1;1;102-102-255;


1 Y-PH PROTN OPTD;ON;;1;1;1;102-102-255;


1 R-PH PROTN OPTD;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.816;;SPI;KALAPAKA400KV BAY-23 PGCIL(GWK)-1

MAIN-2 CARRIER RECEIVE;OFF;;1;0;0;;



W;06-09-2016 16:43:37.781;;SPI;KALAPAKA400KV BAY-17 KMM-1 MAIN-1/2

CVT FUSE FAIL;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.767;;SPI;KALAPAKA400KV BAY-16 KMM-2 MAIN-2

CVT FUSE FAIL;ON;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.753;;SPI;KALPAKA 400KVBAY-14 STPP-1 MAIN-1

CARRIER SEND;OFF;;1;0;0;;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CARRIER SEND;ON;;1;0;0;;



W;06-09-2016 16:43:37.463;;SPI;KALAPAKA400KV BAY-6 STPP-3 MAIN-1







CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;

Annexure-III

Page 6 of 9

SRPC

Highlight

SRPC

Highlight

SRPC

Highlight

SRPC

Highlight

SRPC

Highlight


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;


CLOSED;OFF;;1;1;1;102-102-255;

W;06-09-2016 16:43:37.412;;SPI;KALAPAKA400KV BAY-5 STPP-4 GR-B 3


W;06-09-2016 16:43:37.411;;SPI;KALAPAKA400KV BAY-5 STPP-4 GR-A 3


W;06-09-2016 16:43:37.411;;SPI;KALAPAKA400KV BAY-13 STPP-2 GR-A/B

3 PH PROTN.TRIP;ON;;1;0;0;;










CARRIER RECEIVE;ON;;1;0;0;;





W;06-09-2016 16:43:37.297;;SPI;KALAPAKA400KV BAY-23 PGCIL(GWK)-1

MAIN-2 CARRIER RECEIVE;ON;;1;0;0;;






CONDUCTOR PROTN.;ON

Annexure-III

Page 7 of 9

SRPC

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MODURES - Events SIMHADRI-1

-------------------------------------------------------------------------

-----

27447 2016-09-06 16:28;48.633 GenStart

ON

27448 D: 00000 00:00;00.000 1 HV-Distance Start O/C

ON

27449 D: 00000 00:00;00.001 17 I0-Invers Start

ON

27450 D: 00000 00:00;00.006 1 HV-Distance Start R+S+T

ON

27451 D: 00000 00:00;00.006 1 HV-Distance Start E

ON

27452 D: 00000 00:00;00.006 1 HV-Distance Start S

ON

27453 D: 00000 00:00;00.006 1 HV-Distance Delay 1

ON

27454 D: 00000 00:00;00.010 16 blk inp def BinOutput

ON

27455 D: 00000 00:00;00.015 17 I0-Invers Start

OFF

27456 D: 00000 00:00;00.021 1 HV-Distance Meas Bward

ON

27457 D: 00000 00:00;00.031 3 EarthFltGnd2 0.42 UN

27458 D: 00000 00:00;00.031 3 EarthFltGnd2 3.70 IN

27459 D: 00000 00:00;00.031 3 EarthFltGnd2 MeasBwd

ON

27460 D: 00000 00:00;00.031 3 EarthFltGnd2 Start

ON

27461 D: 00000 00:00;00.290 1 HV-Distance Meas Bward

OFF

27462 D: 00000 00:00;00.311 1 HV-Distance Delay >= 2

ON


ON


OFF

27465 D: 00000 00:00;00.346 Bin.Inp. Nr. 2/ 1 (CARR RECD )

ON

27466 D: 00000 00:00;00.346 11 CARR RECV-1 BinOutput

ON


ON

27468 D: 00000 00:00;00.395 Bin.Inp. Nr. 2/ 1 (CARR RECD )

OFF


OFF


OFF

27471 D: 00000 00:00;00.420 1 HV-Distance Meas Fward

ON

Annexure-III

Page 8 of 9

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27472 D: 00000 00:00;00.421 GenTrip

ON

27473 D: 00000 00:00;00.421 1 HV-Distance Trip CB S

ON

27474 D: 00000 00:00;00.426 10 DisturbanceR BinOutput

ON

27475 D: 00000 00:00;00.431 1 HV-Distance

36.88 [refLength]

27476 D: 00000 00:00;00.431 1 HV-Distance

4.94 + j 3.06 Z (RE)

27477 D: 00000 00:00;00.431 1 HV-Distance Trip CB 1P

ON

27478 D: 00000 00:00;00.476 1 HV-Distance Start O/C

OFF

27479 D: 00000 00:00;00.481 1 HV-Distance Start E

OFF


OFF

27481 D: 00000 00:00;00.481 1 HV-Distance Delay >= 2

OFF

27482 D: 00000 00:00;00.481 1 HV-Distance Meas Fward

OFF

27483 D: 00000 00:00;00.481 1 HV-Distance Start R+S+T

OFF

27484 2016-09-06 16:28;49.116 GenStart

OFF

27485 2016-09-06 16:28;49.120 1 HV-Distance Trip CB S

OFF

27486 2016-09-06 16:28;49.120 GenTrip

OFF

27487 2016-09-06 16:28;49.120 1 HV-Distance Trip CB 1P

OFF

27488 2016-09-06 16:28;49.120 1 HV-Distance Start S

OFF

27489 2016-09-06 16:28;49.123 10 DisturbanceR BinOutput

OFF

27490 2016-09-06 16:28;49.123 3 EarthFltGnd2 MeasBwd

OFF

27491 2016-09-06 16:28;49.123 3 EarthFltGnd2 Start

OFF

27492 2016-09-06 16:28;49.130 16 blk inp def BinOutput

OFF

27493 2016-09-06 16:35;22.478 Bin.Inp. Nr. 1/ 1 (BREAKER CLOSE INPUT )

ON


OFF


ON


OFF

27497 2016-09-06 19:03;45.451 MMI is on

ON

�

Annexure-III

Page 9 of 9

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Annexure-IV

System Studies

A. Study results pertaining to multiple trippings in Kalpaka – Gajuwaka – HNPCL – Simhadri

(KGHS) Corridor on 6th September, 2016

Sl. No.

Element Line Length (km)/ Type of Conductor

From end To end

1 Kalpaka –Simhadri line-2 3.72/ Twin Moose DT OVR-II 2 Kalpaka –Simhadri line-3 3.72/ Twin Moose DT (conclusion from EL) OVR-II

3 Kalpaka –Simhadri line-4 3.72/ Twin Moose DT OVR-II 4 Kalpaka –Simhadri line-1 3.72/ Twin Moose Z1 Z2-CAT (Y-ph); PDR (R-ph; B-ph)


6 Kalapaka-Gajuwaka line-2 3.39/ Twin Moose Not Tripped Z2 7 Gajuwaka-Vijayawada line-1 316.9/ Twin Moose Z4 Z2

8 Gajuwaka ICT-1 --- O/C Relay operation 9 Kalpaka ICT-1 --- BBP operation

10 Kalpaka-Vemagiri Line-1 166.93/ Twin Moose BBP operation DT 11 Kalpaka-HNPCL Line-1 7.35/ Twin Moose BBP operation DT

12 Unit-I’s GT --- PRD Relay

Incident-1 (I1): Tripping of Kalpaka – Simhadri lines – 1,2,3,4

Incident-2 (I2): Tripping of Kalpaka – Gajuwaka lines – 1,2 & Gajuwaka – Vijayawada line-1 & Gajuwaka ICT-1

Incident-3 (I3): Tripping of Kalpaka ICT-1 & Kalpaka-Vemagiri line-1 & Kalpaka-HNPCL line-1 & HNPCL Unit-I

Incident-4 (I4): HVDC Gajuwaka Reduction by 160 MW

Incident-5 (I5): NTPC-Simhadri Generation Reduction by 250 MW

Annexure-V

Page 1 of 7

Existing Network (06.09.2016)

Case-1: BaseCase (06.09.16)

Case-2: Case-1 + I1

Case-3: Case-1 + I1 + I2

Case-4: Case-1 + I1 + I2 + I3

Case-5: Case-1 + I1 + I2 + I3 + I4

Case-6: Case-1 + I1 + I2 + I3 + I4 + I5

Power Flows: Existing Network (06.09.2016) Case No: Simhadri-

Kalpaka lines -1&2&3& 4

Simhadri – Gajuwaka lines- 1 &2

Simhadri – Vemagiri lines- 1 &2

Gajuwaka-Vijayawada line-1

Kalpaka-Khammam lines -1 & 2

Kalapaka - Gajuwaka lines – 1 & 2

Kalpaka-Vemagiri Lines - 1&2

Kalpaka-HNPCL Line-1

Case-1: BaseCase (06.09.16)

272 49 198.4 183.3 231.2 -70.6 249.3 -249.9

Case-2: Case-1 + I1

NC 562 229.4 180.8 225.4 -582.4 229.5 -249.9

Case-3: Case-2 + I2

NC -248.8 1040.2 NC 106.5 NC -212.3 -249.9

Case-4: Case-3 + I3

NC -248.8 1040.2 NC -7.2 NC NC/-444.5 NC/0

Case-5: Case-4 + I4

NC -169.4 960.9 NC -14.9 NC NC/-426.7 NC/0

Case-6: Case-5 + I5

NC -169.4 829.4 NC -27.7 NC NC/-396.8 NC/0

Annexure-V

Page 2 of 7

B. Study results pertaining to power evacuation from Kalpaka – Gajuwaka – HNPCL – Simhadri

(KGHS) Corridor

B.1 Existing Network (Normal)

Case-7: BaseCase (Normal) ------------------- (N-0)

Case-8: Case-7 + Tripping of Simhadri-Kalpaka line -1 -------------------- (N-1)

Case-9: Case-7 + Tripping of Simhadri-Kalpaka lines - 1 & 2 -------------------- (N-2)

Case-10: Case-7 + Tripping of Simhadri-Kalpaka lines - 1, 2, 3 & 4 -------------------- (N-4)

B.2 Reconfigured Network-1 (with deletion of 400 kV Khammam – Kalpaka D/C line and addition of 400 kV

Khammam - Gajuwaka D/C line)

Case-11: New BaseCase-1 -------------------- (N-0)

Case-12: Case-11 + Tripping of Simhadri-Kalpaka line – 1 -------------------- (N-1)

Case-13: Case-11 + Tripping of Simhadri-Kalpaka lines – 1 & 2 -------------------- (N-2)

Case-14: Case-11 + Tripping of Simhadri-Kalpaka lines - 1, 2, 3 & 4 -------------------- (N-4)

B.3 Reconfigured Network-2 (with joining of existing 400 kV Khammam – Kalpaka D/C and 400 kV Kalpaka -

Gajuwaka D/C line by bypassing Kalpaka)

Case-15: New BaseCase-2 --------------------- (N-0)

Case-16: Case-15 + Tripping of Simhadri-Kalpaka line - 1 --------------------- (N-1)

Case-17: Case-15 + Tripping of Simhadri-Kalpaka lines – 1 & 2 --------------------- (N-2)

Case-18: Case-15 + Tripping of Simhadri-Kalpaka lines - 1, 2, 3 & 4 --------------------- (N-4)

Annexure-V

Page 3 of 7

Power Flows: Existing Network (Normal) Case No: Simhadri-

Kalpaka lines -1,2,3, 4




Kalpaka-Khammam lines -1 & 2




Case-7: BaseCase (Normal)

266.4 52.1 206.5 193.7 243.6 -49.6 259.8 -249.9

Case-8: Case-7 + Tripping of Simhadri-Kalpaka line-1

NC/ 344.5 67.2 207.4 193.6 243.5 -64.7 259.2 -249.9

Case-9: Case-7 + Tripping of Simhadri-Kalpaka lines – 1 & 2

NC/ 487.4 94.9 209.1 193.5 243.1 -92.4 258.1 -249.9

Case-10: Case-7 + Tripping of Simhadri-Kalpaka lines 1, 2, 3 & 4

NC 554.6 236.8 191.2 237.9 -550 240.3 -249.9

Power Flows: Reconfigured Network-1 (with deletion of 400 kV Khammam – Kalpaka D/C line and addition of 400 kV Khammam - Gajuwaka D/C line) Case No: Simhadri-

Kalpaka lines -1,2,3,4




Gajuwaka-Khammam lines -1 & 2




Case-11: New BaseCase-1

246.8 90.9 206.9 192.5 243 152.2 260.8 -249.9

Case-12: Case-11 + Tripping of Simhadri-Kalpaka line – 1

NC/ 319.2 105 207.7 192.4 242.9 138.1 260.2 -249.9

Case-13: Case-11 + Tripping of Simhadri-Kalpaka lnies 1 & 2L1,L2

NC/ 451.5 130.7 209.2 192.2 242.8 112.3 259.1 -249.9

Annexure-V

Page 4 of 7


NC 557.1 234.3 189.3 240.6 -315.1 241.7 -249.9

Power Flows: Reconfigured Network-2 (with joining of existing 400 kV Khammam – Kalpaka D/C line and 400 kV Kalpaka - Gajuwaka D/C line by bypassing Kalpaka) Case No: Simhadri-

Kalpaka lines -1,2,3,4




Gajuwaka-Khammam lines -1 & 2




Case-15: New BaseCase-2

175.8 231.2 208.6 188.2 239.6 --- 264.7 -249.9

Case-16: Case-15 + Tripping of Simhadri-Kalpaka line-1

NC/ 233.6 232 209.1 188.5 239.8 --- 264 -249.9

Case-17: Case-15 + Tripping of Simhadri-Kalpaka lines – 1 & 2

NC/ 347.8 233.5 210.1 188.9 253.5 --- 262.6 -249.9


NC 446.7 344.7 248.9 289 --- 73.9 -249.9

Annexure-V

Page 5 of 7

B.4 Analysis & Conclusions:

NTPC-Simhadri STPS (2x500 MW + 2x500 MW) has eight evacuation (twin moose) lines, viz., 400 kV Simhadri –

Kalpaka 2xD/C lines, 400 kV Simhadri – Vemagiri D/C line, 400 kV Simhadri – Gajuwaka D/C line. As such, it is

eminently placed in meeting system security requirements [‘N-1’ & ‘(N-1)-1’ compliance].

In the immediate network connecting Simhadri STPS, while Gajuwaka and HNPCL are effective generation centres,

Kalpaka and Vemagiri are effective load centres; as such flow on 400 kV Simhadri – Gajuwaka D/C line is always less

under normal operating conditions. Similarly, since the load at Kalpaka is being met from Simhadri STPS and HNPCL

TPS, flow on 400 kV Gajuwaka – Kalpaka D/C line is also always less under normal operating conditions. Again since

Vemagiri has other avenues in addition to Simhadri for meeting its load, evacuation from Simhadri-STPS is mainly

through 400 kV Simhadri – Kalpaka 2 x D/C lines. This explains the unequal/ inequitable distribution of power flows

along the evacuating lines from Simhadri STPS.

It can be seen from the study results for the existing network [Existing Network (Normal)] that even though Simhadri

– Gajuwaka lines and Gajuwaka – Kalpaka lines are floating under normal operating conditions, they get loaded

significantly under the contingency of tripping of Simhadri – Kalpaka lines.

Now, w.r.t. NTPC’s request of conducting feasibility studies to effect equitable distribution of power flows along its

evacuating lines by shifting 400 kV Kalpaka – Khammam D/C line from Kalpaka to Gajuwaka, the following must be

noted before considering any alternatives:

1. In steady state there is absolutely no issue for evacuation with 8 lines.

2. The multiple trippings event on 06.09.2016, the motive behind NTPC’s request, was an N-8 event (N-4 at

Simhadri).

3. Even during this event, the line loadings were relieved once Gazuwaka import was reduced, and SRLDC was even

preparing for reversing when Kalapaka lines were synched.

4. It would do well to fix quicker protection issues as brought in the Recommendations given at Item No. 5, before

going for any network reconfiguration citing a rarest (N-8) tripping event as that occurred on 06.09.2016.

Annexure-V

Page 6 of 7

Alternative-1: Reconfiguring the Network by deleting 400 kV Khammam – Kalpaka D/C line and adding 400

kV Khammam - Gajuwaka D/C line in its place (Reconfigured Network – 1)

With this reconfigured network, loading of Simhadri – Gajuwaka lines and Gajuwaka – Kalpaka lines has not

increased to the desired extent either under normal or contingency conditions. Moreover, since this requires

laying of new lines from Kalpaka to Gajuwaka alongside constructing additional 400 kV bays at Gajuwaka and

results in increased short circuit fault level at Gajuwaka, this option is ruled out.

Alternative-2: Reconfiguring the Network by joining the existing 400 kV Khammam – Kalpaka D/C line with

400 kV Kalpaka - Gajuwaka D/C line by bypassing Kalpaka (Reconfigured Network – 2)

With this reconfigured network, loading of Simhadri – Gajuwaka lines and Gajuwaka – Khammam lines has

considerably increased. Due to this, equitable distribution of power along the evacuating lines of Simhadri STPS

both under normal and contingency conditions can be observed to be significantly improved.

However, it must be noted that this reconfiguration requires providing (i) Circuit Breakers with PIR and (ii)

suitable Line Reactors at Gajuwaka end for 400 kV Gajuwaka – Khammam D/C lines.

Even though this Alternative seems to be a good option, there is a need to consider this reconfiguration taking

into account the upcoming transmission network that could have effect on this corridor like Hinduja evacuation

system, Srikakula – Garividi - Kalpaka lines, Vemagiri – Khammam – Hyderabad lines, etc.

Thus, while NTPC, with the concurrence of APTRANSCO, is free to approach PSPA-II Division of CEA

and CTU for the appropriateness of this reconfiguration, and decide accordingly for consideration by

Standing Committee on Power System Planning for Southern Region, it is essential that they ensure all

outstanding protection issues at its Simhadri STPS are fixed before doing so.

*****

Annexure-V

Page 7 of 7

250.9

117.2

248.9

126.2

19.99

1.0506

250.9

117.2

248.9

126.2 1.0587

19.99

1.0506

17.49

17.49

1.0587

414009GAZUWAKA

1.0400.0

414011KALPAKKA

1.0400.0

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.1

254025JP_GZW_HVDC

1.0400.1

70.6

17.1

70.6

15.0

70.6

17.1

70.6

15.0

49.0

54.9

5.5

49.0

54.9

49.0

5.5

181.2

23.2

183.3

63.1

1

0.0

300.0

F

R1

R1

0.0

45.3

R2

0.0

45.3

R3

0.0

57.1

3 400.0

69.7R

4 400.0

69.7R

R10.0

57.1

R1

0.0

59.2

R2

0.0

59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.8

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.2

272.0

23.7

272.0 25.4

272.0

23.7

25.4

272.0

23.7

25.4

272.0

23.7

25.4

249.

3 1

28.

5

247

.146

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249.

3 1

28.

5

247

.146

.6

249.920.1

250.0 23.7

249.920.1

250.0

231.2 227.4

10.2

231.2

81.4

227.4

10.2

1 391.4

69.7R

2 391.4

69.7R

196.9

18.7 111.6

196.9

18.7

198.4

111.6

162.4

6.8

163.0

162.4

6.8

163.0

14.1

104.8

1.9

105.1

1 500.0

47.4R

161.5

34.6

161.0

25.3

R1

0.0

46.8

1 0.0

300.1

272.0

272.0

272.0

59.7

23.7 14.1

49.0

81.4

198.4

412024GAZUWAKA-PG

1.0213.4

1.0

00

0

1.0

00

0

265.3

5.3 1.0

00

0

1.0

00

0

35.0

412051KALPAKKA

1.0213.5

250.7

9.1

1.0

00

0

1.0

00

0

35.6

250.7

9.1

1.0

00

0

1.0

00

0

35.6

250.7

9.1

1.0

00

0

1.0

00

0256.0

35.6

166.1

18.9

166.2

18.4

166.1

18.9

166.2

18.4

256.0

256.0

271.3

CASE-1

Page 1 of 18

Annexure-VI

250.9

117.2

248.9

126.2

19.99

1.0506

250.9

117.2

248.9

126.2 1.0587

19.99

1.0506

17.49

17.49

1.0587

414009GAZUWAKA

1.0399.9

414011KALPAKKA

1.0400.0

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.1

254025JP_GZW_HVDC

1.0400.1

582.6

65.2

582.4

65.3

582.6

65.2

582.4

65.3

561.

2

103.

4

44.8

561.

2

103.

4

562.0

44.8

178.8

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1

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R1

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R2

0.0

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R3

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57.1

3 400.0

63.7R

4 400.0

63.7R

R10.0

57.1

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R2

0.0

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414012SIMHADRI-I

1.0400.0

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1.0407.7

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1.0400.0

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1.0406.2 2

29.

5 1

27.

6

227

.642

.7

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6

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249.917.0

250.0 20.5

249.917.0

250.0

225.4 221.8

8.8

225.4

81.8

221.8

8.8

1 391.4

63.7R

2 391.4

63.7R

227.4

23.8 111.3

227.4

23.8

229.4

111.3

167.0

7.8

167.8

167.0

7.8

167.8

14.7

107.8

1.3

108.2

1 500.0

41.0R

165.5

35.3

164.9

24.2

R1

0.0

46.8

1 0.0

300.1

60.0

20.5 14.7

562.0

81.8

229.4

412024GAZUWAKA-PG

1.0213.5

1.0

00

0

1.0

00

0

268.2

4.0 1.0

00

0

1.0

00

0

34.3

412051KALPAKKA

1.0213.6

246.5

9.9

1.0

00

0

1.0

00

0

35.6

246.5

9.9

1.0

00

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9.9

1.0

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35.6

161.6

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161.8

17.3

161.6

17.8

161.8

17.3

251.6

251.6

274.3

CASE-2

Page 2 of 18

Annexure-VI

250.9

117.3

248.9

126.1

19.97

1.0506

250.9

117.3

248.9

126.1 1.0587

19.97

1.0506

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17.49

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414009GAZUWAKA

1.0399.9

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1.0399.8

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1.0400.0

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1.0404.3

254025JP_GZW_HVDC

1.0400.1

248.

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9

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4 400.0

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57.1

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58.4

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0.0

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1.0402.1

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12.

3 3

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3 3

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106.5 105.6

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106.5

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105.6

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1 391.4

59.3R

2 391.4

59.3R

1000.6

271.1 62.6

1000.6

271.1

1040.2

62.6

309.1

59.2

311.7

309.1

59.2

311.7

47.3

199.8

30.7

201.3

1 500.0

21.3R

247.9

65.4

246.6

14.6

R1

0.0

46.7

1 0.0

300.1

78.3

10.6 47.3

248

.8

82.9

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412024GAZUWAKA-PG

1.0212.8

1.0

00

0

1.0

00

0

1.0

00

0

1.0

00

0

412051KALPAKKA

1.0213.0

232.6

19.0

1.0

00

0

1.0

00

0

42.1

232.6

19.0

1.0

00

0

1.0

00

0

42.1

232.6

19.0

1.0

00

0

1.0

00

0237.2

42.1

187.4

7.6

187.6

6.9

187.4

7.6

187.6

6.9

237.2

237.2

CASE-3

Page 3 of 18

Annexure-VI

250.9

117.3

248.9

126.2

20.00

1.0504

250.9

117.3

248.9

126.2 1.0588

20.00

1.0504

17.49

17.49

1.0588

414009GAZUWAKA

1.0399.9

414011KALPAKKA

1.0392.7

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0402.7

254025JP_GZW_HVDC

1.0400.1

248.

9

23.7

27.4

248.

9

23.7

248

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1

0.0

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F

R1

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1.0400.0

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1.0400.0

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1.0392.7

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1.0404.8

444.

5 2

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10.3

7.2

94.2

7.3

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66.1R

2 391.4

66.1R

1000.4

259.3 76.3

1000.4

259.3

1040.2

76.3

284.4

59.7

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284.4

59.7

286.7

51.2

183.9

31.2

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1

273.0

69.5

271.4

22.4

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0.0

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80.5

0.0 51.2

248

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412024GAZUWAKA-PG

1.0209.3

1.0

00

0

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00

0

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00

0

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00

0

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1.0209.3

1.0

00

0

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00

0

225.0

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00

0

1.0

00

0

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225.0

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00

0

1.0

00

0229.5

39.3

108.7

13.4

108.8

13.5

108.7

13.4

108.8

13.5

229.5

CASE-4

Page 4 of 18

Annexure-VI

170.4

72.4

169.5

79.0

20.00

1.0685

170.4

72.4

169.5

79.0 1.1191

20.00

1.0685

17.49

17.49

1.1191

414009GAZUWAKA

1.0400.4

414011KALPAKKA

1.0393.2

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0403.1

254025JP_GZW_HVDC

1.0415.3

169.

5

71.3

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5

71.3

169

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21.0

1

0.0

300.6

F

R1

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4 400.0

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R10.0

57.1

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1.0400.0

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1.0400.8

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1.0393.2

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1.0404.9

426.

7 3

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12.8

14.9

91.9

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2 391.4

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927.1

223.7 44.7

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223.7

960.9

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253.4

50.5

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412024GAZUWAKA-PG

1.0209.5

1.0

00

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00

0

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00

0

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00

0

412051KALPAKKA

1.0209.6

1.0

00

0

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00

0

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00

0

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00

0

40.2

223.8

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1.0

00

0

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00

0228.2

40.2

108.2

12.7

108.3

12.8

108.2

12.7

108.3

12.8

228.2

CASE-5

Page 5 of 18

Annexure-VI

170.4

72.4

169.5

79.0

20.00

1.0685

170.4

72.4

169.5

79.0 1.1191

20.00

1.0685

17.50

17.50

1.1191

414009GAZUWAKA

1.0400.4

414011KALPAKKA

1.0394.4

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0404.0

254025JP_GZW_HVDC

1.0415.3

169.

5

71.3

21.0

169.

5

71.3

169

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21.0

1

0.0

300.6

F

R1

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0.0

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0.0

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4 330.0

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R10.0

57.1

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0.0

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0.0

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1.0400.0

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1.0402.7

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424004KHAMMAM

1.0405.1

396.

8 4

8.7

402

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17.4

27.7

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1.6R

2 330.0

1.6R

804.4

174.4 4.4

804.4

174.4

829.4

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35.3

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0.0

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412024GAZUWAKA-PG

1.0210.0

1.0

00

0

1.0

00

0

1.0

00

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00

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412051KALPAKKA

1.0210.0

1.0

00

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00

0

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00

0226.1

42.2

107.4

11.2

107.4

11.3

107.4

11.2

107.4

11.3

226.1

CASE-6

Page 6 of 18

Annexure-VI

326.6

148.7

323.2

175.0

19.90

1.0355

326.6

148.7

323.2

175.0 1.0275

19.90

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

49.6

63.5

49.6

61.4

49.6

63.5

49.6

61.4

52.0

41.0

8.3

52.0

41.0

52.1

8.3

191.4

25.7

193.7

63.0

1

0.0

299.7

F

R1

R1

0.0

45.3

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0.0

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0.0

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4 400.0

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R10.0

57.1

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0.0

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414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

266.47.5

266.4 9.3

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259.

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3

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3

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250.0 16.1

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250.0

243.6 239.4

13.3

243.6

80.6

239.4

13.3

1 391.4

46.3R

2 391.4

46.3R

204.8

19.5 111.0

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19.5

206.5

111.0

176.7

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177.5

176.7

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177.5

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114.0

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167.7

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266.4

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206.5

412024GAZUWAKA-PG

1.0214.3

224.6

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00

0

1.0

00

0

228.8

28.8

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00

0

1.0

00

0

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412051KALPAKKA

1.0214.3

215.4

11.2

1.0

00

0

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1.0

00

0

1.0

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1.0

00

0

1.0

00

0219.2

30.6

104.5

17.6

104.6

17.7

104.5

17.6

104.6

17.7

219.2

219.2

228.8

CASE-7

Page 7 of 18

Annexure-VI

326.6

148.7

323.2

175.0

19.89

1.0355

326.6

148.7

323.2

175.0 1.0275

19.89

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

64.8

63.9

64.7

61.9

64.8

63.9

64.7

61.9

67.2

41.6

7.8

67.2

41.6

67.2

7.8

191.3

25.7

193.6

63.0

1

0.0

299.7

F

R1

R1

0.0

45.3

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0.0

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0.0

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4 400.0

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R10.0

57.1

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0.0

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59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

344.5

11.2

12.6

344.5

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344.5

11.2

12.6

259.

2 1

28.

3

256

.948

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259.

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249.910.4

250.0 13.9

249.910.4

250.0

243.5 239.2

13.3

243.5

80.6

239.2

13.3

1 391.4

46.7R

2 391.4

46.7R

205.7

19.6 111.0

205.7

19.6

207.4

111.0

176.9

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177.7

176.9

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114.1

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1 500.0

27.8R

167.9

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0.0

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281.9

344.5

344.5

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60.2

13.9 15.3

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80.6

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412024GAZUWAKA-PG

1.0214.3

224.6

7.6 1.0

00

0

1.0

00

0

228.9

28.8

224.6

7.6 1.0

00

0

1.0

00

0

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412051KALPAKKA

1.0214.3

215.2

11.2

1.0

00

0

1.0

00

0

30.6

215.2

11.2

1.0

00

0

1.0

00

0

30.6

215.2

11.2

1.0

00

0

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00

0219.1

30.6

104.4

17.6

104.4

17.7

104.4

17.6

104.4

17.7

219.1

219.1

228.9

CASE-8

Page 8 of 18

Annexure-VI

326.6

148.7

323.2

174.9

19.89

1.0355

326.6

148.7

323.2

174.9 1.0275

19.89

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

92.4

65.1

92.4

63.1

92.4

65.1

92.4

63.1

94.9

42.8

6.7

94.9

42.8

94.9

6.7

191.2

25.8

193.5

63.1

1

0.0

299.7

F

R1

R1

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45.3

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4 400.0

47.7R

R10.0

57.1

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0.0

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0.0

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414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

487.2

19.2

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249.97.0

250.0 10.5

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250.0

243.1 238.9

13.3

243.1

80.7

238.9

13.3

1 391.4

47.7R

2 391.4

47.7R

207.4

19.8 110.9

207.4

19.8

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114.3

0.4

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21.1R

168.1

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412024GAZUWAKA-PG

1.0214.3

224.8

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00

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00

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229.0

28.7

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00

0

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00

0

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412051KALPAKKA

1.0214.3

215.0

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1.0

00

0

1.0

00

0

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215.0

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1.0

00

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0218.8

30.6

104.1

17.5

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17.6

104.1

17.5

104.2

17.6

218.8

218.8

229.0

CASE-9

Page 9 of 18

Annexure-VI

326.6

148.7

323.2

174.8

19.85

1.0355

326.6

148.7

323.2

174.8 1.0275

19.85

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.7

414011KALPAKKA

1.0399.8

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

550.2

101.6

550.0

101.5

550.2

101.6

550.0

101.5

553.

8

80.2

21.9

553.

8

80.2

554.6

21.9

189.0

25.5

191.2

63.3

1

0.0

299.5

F

R1

R1

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45.3

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4 400.0

51.9R

R10.0

57.1

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0.0

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1.0400.0

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1.0407.5

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424004KHAMMAM

1.0406.1 2

40.

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249.9 11.7

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237.9

81.4

233.8

12.4

1 391.4

51.9R

2 391.4

51.9R

234.7

24.3 110.4

234.7

24.3

236.8

110.4

181.3

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182.1

181.3

10.4

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117.0

0.2

117.5

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171.7

35.7

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281.9

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1.0214.2

226.9

6.5 1.0

00

0

1.0

00

0

231.2

28.1

226.9

6.5 1.0

00

0

1.0

00

0

28.1

412051KALPAKKA

1.0214.3

210.8

11.9

1.0

00

0

1.0

00

0

30.5

210.8

11.9

1.0

00

0

1.0

00

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30.5

210.8

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1.0

00

0

1.0

00

0214.5

30.5

99.4

16.5

99.4

16.6

99.4

16.5

99.4

16.6

214.5

214.5

231.2

CASE-10

Page 10 of 18

Annexure-VI

326.6

148.7

323.2

175.2

19.94

1.0355

326.6

148.7

323.2

175.2 1.0275

19.94

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.9

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

152.2

3.4

152.2

5.3

152.2

3.4

152.2

5.3

90.9

53.9

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90.9

53.9

90.9

4.4

190.2

25.1

192.5

62.7

0.0

299.9

0.0

45.3

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45.3

0.0

57.1

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400.0

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0.0

57.1

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414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

246.81.8

246.8 3.6

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3.6

246.81.8

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8 1

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8 1

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249.910.7

250.0 14.3

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250.0

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391.4

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205.2

19.5 111.0

205.2

19.5

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177.4

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178.2

177.4

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178.2

15.3

114.5

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114.9

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28.5R

168.1

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281.9

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243.0

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238.8

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238.8

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412024GAZUWAKA-PG

1.0214.3

222.9

8.7 1.0

00

0

1.0

00

0

227.1

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00

0

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00

0

29.5

412051KALPAKKA

1.0214.3

216.4

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00

0

1.0

00

0

30.3

216.4

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00

0

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00

0

30.3

216.4

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00

0

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00

0220.3

30.3

106.0

18.4

106.1

18.5

106.0

18.4

106.1

18.5

220.3

220.3

227.1

CASE-11

Page 11 of 18

Annexure-VI

326.6

148.7

323.2

175.2

19.94

1.0355

326.6

148.7

323.2

175.2 1.0275

19.94

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.9

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

138.1

3.2

138.1

5.1

138.1

3.2

138.1

5.1

105.0

54.2

4.6

105.0

54.2

105.0

4.6

190.1

25.1

192.4

62.7

0.0

299.9

0.0

45.3

0.0

45.3

0.0

57.1

400.0

47.7R

400.0

47.7R

0.0

57.1

0.0

59.2

0.0

59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

319.14.0

5.6

319.14.0

5.6

319.14.0

5.6

260.

2 1

28.4

257

.848

.2

260.

2 1

28.4

257

.848

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249.98.2

250.0 11.7

249.98.2

250.0

391.4

47.7R

391.4

47.7R

206.0

19.6 110.9

206.0

19.6

207.7

110.9

177.5

9.4

178.3

177.5

9.4

178.3

15.4

114.5

0.3

115.0

500.0

23.4R

168.2

35.0

167.6

24.3

0.0

46.7

0.0

281.9

319.2

319.2

319.2

60.3

11.7

15.4

105.0207.7

242.9

80.8

238.7

13.3

242.9

80.8

238.7

13.3

412024GAZUWAKA-PG

1.0214.3

223.0

8.6 1.0

00

0

1.0

00

0

227.2

29.4

223.0

8.6 1.0

00

0

1.0

00

0

29.4

412051KALPAKKA

1.0214.3

216.3

10.7

1.0

00

0

1.0

00

0

30.3

216.3

10.7

1.0

00

0

1.0

00

0

30.3

216.3

10.7

1.0

00

0

1.0

00

0220.2

30.3

105.9

18.4

105.9

18.5

105.9

18.4

105.9

18.5

220.2

220.2

227.2

CASE-12

Page 12 of 18

Annexure-VI

326.6

148.7

323.2

175.1

19.93

1.0355

326.6

148.7

323.2

175.1 1.0275

19.93

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.9

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

112.3

2.5

112.3

4.5

112.3

2.5

112.3

4.5

130.6

55.1

5.3

130.6

55.1

130.7

5.3

190.0

25.1

192.2

62.8

0.0

299.8

0.0

45.3

0.0

45.3

0.0

57.1

400.0

49.0R

400.0

49.0R

0.0

57.1

0.0

59.2

0.0

59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

451.49.6

10.4

451.49.6

10.4

259.

1 1

28.4

256

.848

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259.

1 1

28.4

256

.848

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249.94.1

250.0 7.7

249.94.1

250.0

391.4

49.0R

391.4

49.0R

207.5

19.8 110.9

207.5

19.8

209.2

110.9

177.7

9.5

178.5

177.7

9.5

178.5

15.4

114.6

0.3

115.1

500.0

15.4R

168.3

35.0

167.7

24.3

0.0

46.7

0.0

281.9

451.5

451.5

60.4

7.7 15.4

130.7209.2

242.8

80.8

238.6

13.3

242.8

80.8

238.6

13.3

412024GAZUWAKA-PG

1.0214.3

223.1

8.5 1.0

00

0

1.0

00

0

227.3

29.4

223.1

8.5 1.0

00

0

1.0

00

0

29.4

412051KALPAKKA

1.0214.3

216.0

10.7

1.0

00

0

1.0

00

0

30.2

216.0

10.7

1.0

00

0

1.0

00

0

30.2

216.0

10.7

1.0

00

0

1.0

00

0219.9

30.2

105.6

18.3

105.7

18.4

105.6

18.3

105.7

18.4

219.9

219.9

227.3

CASE-13

Page 13 of 18

Annexure-VI

326.6

148.7

323.2

174.9

19.89

1.0355

326.6

148.7

323.2

174.9 1.0275

19.89

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.8

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

315.2

29.2

315.1

27.7

315.2

29.2

315.1

27.7

556.3

88.2

29.8

556.3

88.2

557.1

29.8

187.2

24.7

189.3

63.1

0.0

299.7

0.0

45.3

0.0

45.3

0.0

57.1

400.0

55.8R

400.0

55.8R

0.0

57.1

0.0

59.1

0.0

59.1

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.5

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

241.

7 1

28.3

239

.645

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241.

7 1

28.3

239

.645

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249.9 18.4

250.014.8

249.9 18.4

250.0

391.4

55.8R

391.4

55.8R

232.2

23.8 110.4

232.2

23.8

234.3

110.4

180.7

10.4

181.5

180.7

10.4

181.5

16.0

116.6

0.2

117.1

500.0

29.7R

170.0

35.4

169.4

23.8

0.0

46.7

0.0

281.9

60.7

14.8 16.0

557.1234.3

240.6

81.3

236.5

13.1

240.6

81.3

236.5

13.1

412024GAZUWAKA-PG

1.0214.3

224.8

7.5 1.0

00

0

1.0

00

0

229.1

28.7

224.8

7.5 1.0

00

0

1.0

00

0

28.7

412051KALPAKKA

1.0214.3

211.8

11.3

1.0

00

0

1.0

00

0

30.1

211.8

11.3

1.0

00

0

1.0

00

0

30.1

211.8

11.3

1.0

00

0

1.0

00

0215.6

30.1

101.0

17.4

101.1

17.5

101.0

17.4

101.1

17.5

215.6

215.6

229.1

CASE-14

Page 14 of 18

Annexure-VI

326.6

148.7

323.2

175.0

19.90

1.0355

326.6

148.7

323.2

175.0 1.0275

19.90

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

231.0

58.0

7.2

231.0

58.0

231.2

7.2

186.1

24.5

188.2

63.1

0.0

299.7

0.0

45.3

0.0

45.3

0.0

57.1

400.0

45.0R

400.0

45.0R

0.0

57.1

0.0

59.2

0.0

59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

175.8 1.8

175.8 0.3

175.8 1.8

0.3

175.8 1.8

0.3

175.8 1.8

0.3

264.

7 1

28.1

262

.248

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264.

7 1

28.1

262

.248

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249.912.6

250.0 16.1

249.912.6

250.0

391.4

45.0R

391.4

45.0R

206.9

19.6 110.8

206.9

19.6

208.6

110.8

180.1

9.9

181.0

180.1

9.9

181.0

15.6

116.2

0.0

116.7

500.0

32.2R

170.1

35.2

169.5

23.9

0.0

46.7

0.0

281.9

175.8

175.8

175.8

60.5

16.1

15.6

231.2208.6

239.6

81.3

235.5

12.8

239.6

81.3

235.5

12.8

412024GAZUWAKA-PG

1.0214.3

216.6

10.0 1.0

00

0

1.0

00

0

220.6

29.7

216.6

10.0 1.0

00

0

1.0

00

0

29.7

412051KALPAKKA

1.0214.3

220.5

9.7

1.0

00

0

1.0

00

0

30.1

220.5

9.7

1.0

00

0

1.0

00

0

30.1

220.5

9.7

1.0

00

0

1.0

00

0224.5

30.1

111.8

19.7

111.9

19.8

111.8

19.7

111.9

19.8

224.5

224.5

220.6

CASE-15

Page 15 of 18

Annexure-VI

326.6

148.7

323.2

175.0

19.90

1.0355

326.6

148.7

323.2

175.0 1.0275

19.90

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

231.8

58.0

7.2

231.8

58.0

232.0

7.2

186.3

24.5

188.5

63.1

0.0

299.7

0.0

45.3

0.0

45.3

0.0

57.1

400.0

45.6R

400.0

45.6R

0.0

57.1

0.0

59.2

0.0

59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

233.5 0.7

1.2

233.5 0.7

1.2

233.5 0.7

1.2

264.

0 1

28.1

261

.548

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264.

0 1

28.1

261

.548

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249.910.2

250.0 13.7

249.910.2

250.0

391.4

45.6R

391.4

45.6R

207.4

19.7 110.8

207.4

19.7

209.1

110.8

180.0

9.9

180.9

180.0

9.9

180.9

15.6

116.2

0.0

116.7

500.0

27.4R

170.0

35.2

169.4

23.9

0.0

46.7

0.0

281.9

233.6

233.6

233.6

60.5

13.7

15.6

232.0209.1

239.8

81.3

235.7

12.9

239.8

81.3

235.7

12.9

412024GAZUWAKA-PG

1.0214.3

217.1

9.9 1.0

00

0

1.0

00

0

221.1

29.7

217.1

9.9 1.0

00

0

1.0

00

0

29.7

412051KALPAKKA

1.0214.3

220.1

9.8

1.0

00

0

1.0

00

0

30.1

220.1

9.8

1.0

00

0

1.0

00

0

30.1

220.1

9.8

1.0

00

0

1.0

00

0224.2

30.1

111.3

19.6

111.4

19.7

111.3

19.6

111.4

19.7

224.2

224.2

221.1

CASE-16

Page 16 of 18

Annexure-VI

326.6

148.7

323.2

175.0

19.90

1.0355

326.6

148.7

323.2

175.0 1.0275

19.90

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.8

414011KALPAKKA

1.0399.9

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0407.0

254025JP_GZW_HVDC

1.0387.8

233.3

58.1

7.2

233.3

58.1

233.5

7.2

186.7

24.6

188.9

63.1

0.0

299.7

0.0

45.3

0.0

45.3

0.0

57.1

400.0

46.9R

400.0

46.9R

0.0

57.1

0.0

59.2

0.0

59.2

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.6

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0406.1

347.83.0

4.4

347.83.0

4.4

262.

6 1

28.2

260

.248

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262.

6 1

28.2

260

.248

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249.96.2

250.0 9.8

249.96.2

250.0

391.4

46.9R

391.4

46.9R

208.4

19.8 110.7

208.4

19.8

210.1

110.7

179.8

9.9

180.7

179.8

9.9

180.7

15.6

116.0

0.0

116.5

500.0

19.5R

169.8

35.2

169.2

23.9

0.0

46.7

0.0

281.9

347.8

347.8

60.5

9.8 15.6

233.5210.1

240.1

81.2

236.0

13.0

240.1

81.2

236.0

13.0

412024GAZUWAKA-PG

1.0214.3

218.0

9.6 1.0

00

0

1.0

00

0

222.0

29.6

218.0

9.6 1.0

00

0

1.0

00

0

29.6

412051KALPAKKA

1.0214.3

219.3

9.9

1.0

00

0

1.0

00

0

30.1

219.3

9.9

1.0

00

0

1.0

00

0

30.1

219.3

9.9

1.0

00

0

1.0

00

0223.4

30.1

110.3

19.4

110.4

19.5

110.3

19.4

110.4

19.5

223.4

223.4

222.0

CASE-17

Page 17 of 18

Annexure-VI

326.6

148.7

323.2

174.6

19.83

1.0355

326.6

148.7

323.2

174.6 1.0275

19.83

1.0355

13.79

13.79

1.0275

414009GAZUWAKA

1.0399.6

414011KALPAKKA

1.0399.8

414020SIMHADRI-II

1.0400.0

414008NUNNA

1.0406.9

254025JP_GZW_HVDC

1.0387.8

446.2

63.4

8.3

446.2

63.4

446.7

8.3

245.2

38.8

248.9

60.1

0.0

299.4

0.0

45.3

0.0

45.3

0.0

57.1

400.0

43.5R

400.0

43.5R

0.0

57.1

0.0

59.1

0.0

59.1

414012SIMHADRI-I

1.0400.0

414014VEMAGIRI

1.0407.5

414027HINDUJA

1.0400.0

424004KHAMMAM

1.0405.8

73.9

119

.4

73.

619

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73.9

119

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73.

619

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249.9 18.8

250.015.3

249.9 18.8

250.0

391.4

43.5R

391.4

43.5R

340.3

46.3 107.2

340.3

46.3

344.7

107.2

147.9

4.9

148.5

147.9

4.9

148.5

13.3

95.5

3.0

95.8

500.0

30.6R

144.2

31.4

143.8

29.6

0.0

46.7

0.0

281.9

59.2

15.3 13.3

446.7344.7

289.0

76.8

283.0

26.1

289.0

76.8

283.0

26.1

412024GAZUWAKA-PG

1.0214.2

345.9

32.0 1.0

00

0

1.0

00

0

356.0

18.5

345.9

32.0 1.0

00

0

1.0

00

0

18.5

412051KALPAKKA

1.0214.3

116.1

36.7

1.0

00

0

1.0

00

0

42.9

116.1

36.7

1.0

00

0

1.0

00

0

42.9

116.1

36.7

1.0

00

0

1.0

00

0117.4

42.9

26.9

19.8

26.9

19.3

26.9

19.8

26.9

19.3

117.4

117.4

356.0

CASE-18

Page 18 of 18

Annexure-VI

400 kV Kalpaka Line-1 distance protection - check list

No. Relay configuration - Line distance protection 1 Name and length of line2 Series compensated? Y/N3 Is this a cable feeder / line feeder/ composite feeder (line+cable)?4 Which mode of communication is used (PLCC/ OPGW)

Details of type relays Main-1 Relay Main-2 Relay Other Relays(Back-up relays, DR, FL etc.)

Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 Alstom P444 ABB REL670Whether the relay is functional?? Yes/ No Yes YesDate of testing 28.09.2016 02-03-2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67/67N/51/51N/59 21/67N/51N/79/59/50BF

Mode of Carrier aided scheme for 21 ( If POR scheme is used whether Current Reversal Guard Logic implemented?)

Accelerated Under reach/ Permissive Under

reach/Intertripping Under reach/ Permissive Overreach/ Blocking Over reach/ Phase Comparison Protection (for

PLCC)

POR POR

Carrier aided scheme active for 67/67N Yes/ No NO NO

Mode of Carrier aided scheme for 67/67N

Directional Comparison Protection (Permissive)/Directional Comparison Protection (Blocking)

NO NO

For 87L which scheme is used? (Pilot wire communication/ digital communication) NO NOPower swing/out of step active? Yes/No yes yesSOTF active? Yes/No yes yes

Auto Reclose (79) active? Yes/No no yes(main breaker and tie breaker)

Breaker failure active Yes/ No no yes(tie Breaker Failure-1 protection)

Load Encroachment active Yes/ No yes yesStub Protection active Yes/ No NO(Not applicable) NO(Not applicable)Fault locator active? Yes/No yes yesDisturbance Recorder active? Yes/No yes yes

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? both both7 Feed from DC supply 1 / DC Supply 2 DC supply 1 DC supply 28 Connected to Dedicated CT core? Define CT core no. to which the relay is connected 1 29 CT ratio selected 2000/1 2000/110 VT ratio selected (400/√3)/(110/√3) (400/√3)/(110/√3)

5

NLine

3.72

OPGW

NTPC Simhadri STPS 1/2

Annexure-VII

Page 1 of 27


No. Relay configuration - Line distance protection Details of separate relays if applicableRelay 1 make and model ABB MAKE REB670

Functions available in Relay 1 Auto reclose/ Breaker Failure/ 67/67N/51/51N

Relay 1 Functional Yes/ NoDate of TestingRelay 2 make and model






Relay 4 Functional Yes/ NoDate of Testing

12 VT Fuse failure protection present & used to block distance function operation? Yes/No Overvoltage protection available Yes/ NoFunctional with two stage protection Yes/No

14 Are all the auxiliary relays (94) considered for Line protection (Main-1/ Main-2/ Backup) provided with supervision relays (74/ 94) ?

Yes/No

15 Do the Line Protection protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)?

Yes/No yes

yes

yes

11

Yes02.03.2016

13 yes

Yes02.03.2016

nil

ALSTOM MAKE MCTI40

Breaker Failure-2 for tie breaker

Breaker Failure-1&2 for main breaker

nil

yes


Annexure-VII

Page 2 of 27




Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 Alstom EPAC3000 ABB REL670Whether the relay is functional?? Yes/ No Yes YesDate of testing 13-04-2016 13-04-2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67/67N/51/51N/59 21/67N/51N/79/59




PLCC)

POR POR

Carrier aided scheme active for 67/67N Yes/ No Yes NO



Directional Comparison Protection (Permissive)

NO

For 87L which scheme is used? (Pilot wire communication/ digital communication) no NOPower swing/out of step active? Yes/No yes yesSOTF active? Yes/No yes yes


Breaker failure active Yes/ No no noLoad Encroachment active Yes/ No yes yesStub Protection active Yes/ No NO(Not applicable) NO(Not applicable)Fault locator active? Yes/No yes yesDisturbance Recorder active? Yes/No yes yes


3.72N

LineOPGW

5


Annexure-VII

Page 3 of 27













Yes/No


Yes/No

ALSTOM MAKE MCTI40


Yes2.3.2016

yes2.3.2016

nil

11

Yes13.04.2016


yes

yes

13 yesyes

yes

ABB MAKE REL670



Annexure-VII

Page 4 of 27




Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 Alstom EPAC3000 ABB REL670Whether the relay is functional?? Yes/ No Yes YesDate of testing 07.03.2016 07.03.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67/67N/51/51N/59 21/67N/51N/79/59




PLCC)

POR POR





NO

For 87L which scheme is used? (Pilot wire communication/ digital communication) no NOPower swing/out of step active? Yes/No yes yesSOTF active? Yes/No yes yes


Breaker failure active Yes/ No no yes(tie Breaker Failure-1 protection)

Load Encroachment active Yes/ No yes yesStub Protection active Yes/ No NO(Not applicable) NO(Not applicable)Fault locator active? Yes/No yes yesDisturbance Recorder active? Yes/No yes yes


3.72N

LineOPGW

5


Annexure-VII

Page 5 of 27













Yes/No


Yes/No

ALSTOM MAKE MCTI40


Yes7.3.2016

nil

11

Yes7.3.2016


yes

yes

13 yesyes

yes

nil


Annexure-VII

Page 6 of 27




Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 Alstom EPAC3000 ABB REL670Whether the relay is functional?? Yes/ No Yes YesDate of testing 9.3.2016 9.3.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67/67N/51/51N/59 21/67N/51N/79/59




PLCC)

POR POR





NO

For 87L which scheme is used? (Pilot wire communication/ digital communication) no noPower swing/out of step active? Yes/No yes yesSOTF active? Yes/No yes yes


Breaker failure active Yes/ No no noLoad Encroachment active Yes/ No yes yesStub Protection active Yes/ No NO(Not applicable) NO(Not applicable)Fault locator active? Yes/No yes yesDisturbance Recorder active? Yes/No yes yes


3.72N

LineOPGW

5


Annexure-VII

Page 7 of 27













Yes/No


Yes/No

ALSTOM MAKE MCTI40


Yes7.3.2016

yes7.3.2016

nil

11

Yes9.3.2016


yes

yes

13 yesyes

yes

ABB MAKE REL670



Annexure-VII

Page 8 of 27

400 kV VEMAGIRI Line-1 distance protection - check list



Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 ABB REL670 Siemens 7SA522Whether the relay is functional?? Yes/ No Yes YesDate of testing 17.5.2016 17.5.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67/67N/51/51N/59 21/67/67N/51/51N/59




PLCC)

PUR PUR

Carrier aided scheme active for 67/67N Yes/ No No No



no no

For 87L which scheme is used? (Pilot wire communication/ digital communication) no noPower swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No no noBreaker failure active Yes/ No no noLoad Encroachment active Yes/ No Yes YesStub Protection active Yes/ No NO(Not applicable) NO(Not applicable)Fault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC supply 1 DC supply 28 Connected to Dedicated CT core? Define CT core no. to which the relay is connected 1 29 CT ratio selected 2000/1 2000/110 VT ratio selected (400/√3)/(110/√3) (400/√3)/(110/√3)

5

193.5NoLinePLCC


Annexure-VII

Page 9 of 27




Relay 1 Functional Yes/ NoDate of TestingRelay 2 make and model ABB MAKE RET670


Relay 2 Functional Yes/ NoDate of TestingRelay 3 make and model ABB MAKE REC670







Yes/No


Yes/No

13 yesyes

yes


Yes17.5.2016

yes

10.3.2016yes

main breaker auto reclosure

Yes17.5.2016

Tie auto reclosure,Breaker Failure-2 for tie breaker

Yes

11

Yes17.5.2016



Annexure-VII

Page 10 of 27




Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 ABB REL670 Siemens 7SA522Whether the relay is functional?? Yes/ No Yes YesDate of testing 10-03-2016 10-03-2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67/67N/51/51N/59 21/67/67N/51/51N/59




PLCC)

PUR PUR




no no

For 87L which scheme is used? (Pilot wire communication/ digital communication) no noPower swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No Yes YesBreaker failure active Yes/ No no noLoad Encroachment active Yes/ No Yes YesStub Protection active Yes/ No NO(Not applicable) NO(Not applicable)Fault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes


5

193.5NoLinePLCC


Annexure-VII

Page 11 of 27













Yes/No


Yes/No

13 yesyes

yes


Yes10.3.2016

yes

10.3.2016yes


Yes10.3.2016


Yes

11

Yes10.03.2016



Annexure-VII

Page 12 of 27

400 kV Gajuwaka Line-1 distance protection - check list







PLCC)

POR POR




no no



5

12.82NoLinePLCC


Annexure-VII

Page 13 of 27













Yes/No


Yes/No

13 yesyes

yes


Yes11.03.2016

yes

11.3.2016yes


Yes11.3.2016


Yes

11

Yes



Annexure-VII

Page 14 of 27








PLCC)

POR POR




no no


6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 1&2 1&28 Connected to Dedicated CT core? Define CT core no. to which the relay is connected DC supply 1 DC supply 29 CT ratio selected 2000/1 2000/110 VT ratio selected (400/√3)/(110/√3) (400/√3)/(110/√3)

5

12.82NoLinePLCC


Annexure-VII

Page 15 of 27













Yes/No


Yes/No

13 yesyes

yes


Yes15.4.2016

yes

15.4.2016yes


Yes15.4.2016


Yes

11

Yes15.4.2016



Annexure-VII

Page 16 of 27

400/220 kV GT-1 Transformer protection - check list

No Relay configuration - Power Transformers protections 1 Name, voltage, power2 Are used 2 groups of protections (Group A and Group B) for transformer protection? Yes /No3 Are Group A and Group B protections connected to separate DC sources for power transformers? Yes /No4 Do the Group A and Group B protections have separate lockout relays? Yes /No

MainA A B C

Details of composite type numerical relays

Relay make and model MBCH12 (GT Differential) CDG 11 (GT Backup E/F )

GTTM22 (GT Over Flux)

MBCH12 (over all Differential)

Whether the relay is functional? Yes /No YES yes yes yesDate of testing 24.11.2014 24.11.2014 24.11.2014 24.11.2014Mention all the active protection 87T (GT Differential) 51NGT (GT Backup E/F) 99GT(GT over Flux) 87GT (Over all Differential)

differential protections Yes (Transformer) NO NO YES (GT & 400KV OVERHEAD Line)

REF protection NO NO NO NOBack-up directional O/C +E/F protection NO Only E/F Protection NO NOOverfluxing protection NA NA Yes NOConnected to Trip Coil 1/Trip Coil2/Both Both Both Both BothFeed from DC supply 1/DC supply2 DC-2 DC-1 DC-2 DC-1

Breaker failure active Yes /NoYes (Available in 50Z- 400KV Breaker LBB of both Main and Tie. Two LBB Relays for each

Breaker)

Yes (Available in 50Z- 400KV Breaker LBB of

both Main and Tie. Two LBB Relays for each

Breaker)


both Main and Tie. Two LBB Relays for each

Breaker)

Yes (Available in 50Z- 400KV Breaker LBB of both Main and Tie. Two LBB Relays for each

Breaker)

Disturbance Report active Yes /No Yes NO NO YesConnected to dedicated CT core?Define CT core no. to which the relay is connected

YES (GT LV Side - CT12 Core1 & CT11 Core1; HV - CT14 YES (CT13 Core1) -- YES (Gen CT-8 & 400KV CT Core 5)

CT ratio selected Yes /No 10000/5 - For GT LV Side & 1000/1- For GT HV Side

1000/1- GT HV Side 10000/5 - For GT LV Side & 1000/1- For GT HV Side

Is CT supervision enabled or not in case of Transformer differential protection ? Yes /No6 Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ? Yes/No

7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)? Yes/No

8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No 390 KV11 LA rating IV side Yes/No 24 KV

Yes

Yes

Yes

GENERATOR TRANSFORMER, 400 / 21 KV, 600 MVA

5

Details of type relays

Yes

Yes (GT Differential - Group - B , Over all Differential - Group - A)YesYes

Other ProtectionsBack up

NO


Annexure-VII

Page 17 of 27



MainA A B C


Relay make and model MBCH12 (GT Differential) CDG 11 (GT Backup E/F )

GTTM22 (GT Over Flux)

MBCH12 (over all Differential)

Whether the relay is functional? Yes /No YES yes yes yesDate of testing 24.11.2014 24.11.2014 24.11.2014 24.11.2014

Mention all the active protection 87T (GT Differential) 51NGT (GT Backup E/F) 9GT(GT over Flux 87GT (Over all Differential)

differential protections Yes (Transformer) NO NO YES (GT & 400KV OVERHEAD Line)

REF protection NO NO NO NOBack-up directional O/C +E/F protection NO Only E/F Protection NO NOOverfluxing protection NA NA Yes NOConnected to Trip Coil 1/Trip Coil2/Both Both Both Both BothFeed from DC supply 1/DC supply2 DC-2 DC-1 DC-2 DC-1

Breaker failure active Yes /NoYes (Available in 50Z- 400KV Breaker LBB of both Main and Tie. Two

LBB Relays for each Breaker)

Yes (Available in 50Z- 400KV Breaker LBB of both

Main and Tie. Two LBB Relays for each Breaker)

Yes (Available in 50Z- 400KV Breaker LBB of both Main and Tie. Two LBB

Relays for each Breaker)

Yes (Available in 50Z- 400KV

Breaker LBB of both Main and Tie. Two LBB Relays for

each Breaker)

Disturbance Report active Yes /No Yes NO NO YesConnected to dedicated CT core?Define CT core no. to which the relay is connected

YES (GT LV Side - CT12 Core1 & CT11 Core1; HV - CT14 Core1) YES (CT13 Core1) -- YES (Gen CT-8 & 400KV CT Core 5)

CT ratio selected Yes /No 10000/5 - For GT LV Side & 1000/1- For GT HV Side 1000/1- GT HV Side10000/5 - For GT LV Side & 1000/1- For GT HV Side

Is CT supervision enabled or not in case of Transformer differential protection ? Yes /No6 Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ? Yes/No7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)? Yes/No8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No 390 KV11 LA rating IV side Yes/No 24 KV

5


Yes

NOYesYes

GENERATOR TRANSFORMER, 400 / 21 KV, 600 MVA Yes (GT Differential - Group - B , Over all Differential - Group - A)

YesYes

Other Protections

Yes

Back up


Annexure-VII

Page 18 of 27



MainA A B C

Details of composite type numerical relaysRelay make and model ABB,RET 670 RET670Whether the relay is functional? Yes /No YES YESDate of testing SEPT 2015 SEPT 2015Mention all the active protection 87T (GT Differential) 87GT, 51NGT, 99GT

differential protections Yes (Transformer) YES (GT & 400KV OVERHEAD Line)

REF protection NO NOBack-up directional O/C +E/F protection NA 51NGT (E/F PROTECTION)Overfluxing protection NA YES (99GT)Connected to Trip Coil 1/Trip Coil2/Both BOTH BOTHFeed from DC supply 1/DC supply2 DC-1 DC-2

Breaker failure active Yes /No


both Main and Tie. Two LBB Relays for

each Breaker)



Disturbance Report active Yes /No YES YES

Connected to dedicated CT core?Define CT core no. to which the relay is connected

YES (GT LV Side - CT5 Core2 & CT7 Core2;

HV - CT1 Core1)

400KV CT - Core-5, Gen CT -A


Gen CT - 20000/5, 400KV CT - 1000/1

Is CT supervision enabled or not in case of Transformer differential protection ? Yes /No6 Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ? Yes/No

7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)? Yes/No

8 OTI/WTI working Yes /No9 h l / k /

YES

YES

YESYES

GENERATOR TRANSFORMER, 400 / 21 KV, 600 MVA Yes (GT Differential -87T - Group - A , over all Differntial - Group - B)

YesYes

5

Details of type relays Back up Other Protections

YES

9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No 390 KV11 LA rating IV side Yes/No 24 KV

YES


Annexure-VII

Page 19 of 27



MainA A B C

Details of composite type numerical relaysRelay make and model ABB,RET 670 RET670Whether the relay is functional? Yes /No YES YESDate of testing SEPT 2015 SEPT 2015Mention all the active protection 87T (GT Differential) 87GT, 51NGT, 99GT

differential protections Yes (Transformer) YES (GT & 400KV OVERHEAD Line)

REF protection NO NOBack-up directional O/C +E/F protection NA 51NGT (E/F PROTECTION)Overfluxing protection NA YES (99GT)Connected to Trip Coil 1/Trip Coil2/Both BOTH BOTHFeed from DC supply 1/DC supply2 DC-1 DC-2

Breaker failure active Yes /No

Yes (Available in 50Z-400KV Breaker LBB of both Main and

Tie. Two LBB Relays for each Breaker)



Disturbance Report active Yes /No YES YES


YES (GT LV Side - CT5 Core2 & CT7 Core2; HV - CT1

Core1)

400KV CT - Core-5, Gen CT -A


Gen CT - 20000/5, 400KV CT - 1000/1

Is CT supervision enabled or not in case of Transformer differential protection ? Yes /No6 Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ? Yes/No7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)? Yes/No8 OTI/WTI working Yes /No9 B h l /PRD ki Y /N

YESYESYESYES

GENERATOR TRANSFORMER, 400 / 21 KV, 600 MVA Yes (GT Differential -87T - Group - A , over all Differntial - Group - B)

YesYes

5


YES

9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No 390 KV11 LA rating IV side Yes/No 24 KV

YES


Annexure-VII

Page 20 of 27

Shunt reactor-1 protection - check list

No Relay configuration - Shunt reactor protections1 Name,Voltage,Power2 Are used 2 groups of protections (Group A and Group B) for shunt reactors protection? Yes /No3 Are Group A and Group B protections connected to separate DC sources for shunt reactors? Yes /No4 Do the Group A and Group B protections have separate lockout relays? Yes /No

MainA A B C


Relay make and model ABB make ,RET 670

ABB make ,RET 670

Whether the relay is functional? Yes /No yes yesDate of testing 11.05.2016 11.05.2016Mention all the active protection 87 64R/50/51/51Ndifferential protection yes no REF protection no yesBack-up directional O/C +E/F protection no noOverfluxing protection alarm noConnected to Trip Coil1 / Trip Coil2 / Both both bothFeed from DC supply 1/DC supply2 DC supply 1 DC supply 2

Breaker failure active Yes /No noBFP-1 is in RET

670 AND BFP-2 is in REC670

Disturbance Recorder active Yes /No yes yes

Connected to dedicated CT core?Define CT core no.to which the relay is connected

core no.2 for differential protection

core-1,3

CT ratio selected 200/1 200/1Is CT supervision enabled or not in case of Reactor differential protection ? Yes /No no no

5Are all the Lock out relays (86) considered for Reactor protection provided with supervision relays (74/ 86) ?

Yes/No

6 Do the Reactor protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)?

Yes/No

7 OTI/WTI indications working Yes /No8 B h lt /PRD ki Y /N

yes

400 KV BUS REACTOR,400 KV,63 Mvar

yesyes

yes

yes

4


yes

8 Bucholtz/PRD working Yes/No9 LA rating HV side Yes/No 390KV

yes


Annexure-VII

Page 21 of 27

Synchro-check - check listNo Relay configuration - Synchro-check protections

Details of type relaysDetails of composite type numerical relays

1 Relay make and model ABB,REC 6702 Whether the relay is functional? Yes /No yes3 Date of testing 28.09.20164 Voltage measurement P-Por P-N P-N5 What is the set value of voltage difference (∆U) ? % 106 What is the set value of Phase angle difference (∆φ ) ? ° 257 What is the set value of frequency slip? (Δf) mHz 300 mHz/sec8 What is the set time delay of output relay? (DELAY) sec 100msec9 Settings value for dead bus/line % <30% Ubase


Annexure-VII

Page 22 of 27

BB - check list

No BB and BF protectionBUSBAR PROTECTION

1 Main BB available or not ? Yes/NoBack-up busbar protection to be provided by either of the following: For 132kV & 220kV - Remote -end distance relay overreaching elements (second zone) Yes/No - Reverse looking element of the local distance relay Yes/No - Directional back-up overcurrent relays at remote end. Yes/No

3 Redundant BBP available or not? Yes/No1 and 1/2 Circuit Breaker schemeSingle busbarDouble busbar

Main-1, Main-2 & Transfer

Main 1 relay Make for ex: REB 500Main 1 relay functional Yes/NoMain 1 relay type Low/High impendanceConnected to Trip Coil1 / Trip Coil2

Feed from DC supply 1/DC supply2

Main 2 relay Make for ex: REB 500Main 2 relay functional Yes/NoMain 2 relay type Low/High impendanceConnected to Trip Coil 1/Trip Coil2Feed from DC supply 1/DC supply2

7 Trip to both coils in case of one BBP Yes/NoBB1

Main-1BB1

Main-2BB2

Main-1BB2

Main-2BB1

Main-1BB1

Main-2BB2

Main-1BB2

Main-2BB1

Main-1BB1

Main-2BB2

Main-1BB2

Main-28 Dedicated CT core for each BB protection Yes/No yes yes yes yes

To be filled for High Impedance busbar protection na na na naa) Is the high impedance protection used for simple busbar arrangement like 1 and 1/2 breaker scheme or single busbar arrangement

Yes/No na na na na

b) Whether the CT ratios and charcteristics are same (Vk etc ) Yes/No na na na na

2

na N/AN/A

N/AN/A

220 kV 400 kV 765 kV

N/A

yes

N/A

N/Ayes

yes

4 Type of bus Bar arrangement (Select from the choices)

1 and 1/2 Circuit Breaker scheme

low impedance low impedance

Busbar 1(BB1)

Busbar 2 (BB2)

yes

Busbar 1(BB1)

Busbar 1,3(BB1)

DC supply 1

ABB MAKE REB 670 ABB MAKE REB 670

Busbar 2 (BB2)

Busbar 2,4 (BB2)

ABB MAKE REB 670 ABB MAKE REB 670

both trip coils

yes yes

both trip coils

DC supply 1both trip coils both trip coils

DC supply 2

5

low impedanceyes yes

low impedance

DC supply 2

6

b) Whether the CT ratios and charcteristics are same (Vk etc.) Yes/No na na na nac) Whether stability check has been conducted? Yes/No na na na nad) Is CT supervision relay provided or not? Yes/No na na na nae) In case of busbar protection where isolator contacts are used for zone selectivity/ CT selection, please fill the below items:

na na na na

- Is check zone enabled or not?? Yes/No na na na na- Is Check zone measurement connected to separate CT cores ? Yes/No na na na na- If check zone Is not enabled, Is the relay setting increased to value higher than the heaviest loaded feeder current.

Yes/No na na na na

9


Annexure-VII

Page 23 of 27

BB - check list

No BB and BF protection 220 kV 400 kV 765 kVTo be filled for Low Impedance busbar protection a) Centralised BBP Yes/No no no no nob) or discentralized BBP with peripheral units? Yes/No yes yes yes yesb) Whether stability check has been conducted? Yes/No yes yes yes yesc) Is CT supervision enabled or not ? Yes/No yes yes yes yesd)In case of busbar protection where isolator contacts are used for zone selectivity/ CT selection, please fill the below items:

- Is check zone enabled or not ? Yes/No

main-1,main-2

are available

main-1,main-2

are available

main-1,main-2

are available

main-1,main-2

are available

- If check zone Is not enabled, Is the relay setting increased to value higher than the heaviest loaded feeder current.

Yes/No yes yes yes yes

11 One zone for one bus Yes/No

12 Are all the Busbar protection Lock out relays (86BB) provided with supervision relays (74/ 86BB) ?

Yes/No

13 Do all the Busbar protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)?

Yes/No

BREAKER FAILURE PROTECTION

14 Breaker failure included in BB protection Yes/No

15 Breaker failure included in Line/transformer protections Yes/No

16 Separate BFP provided Yes/No

17 If separate BFP is provided, furnish Make/ Model

10

yes

yes for stage-1 tie feeders BFP-1 is in REL670 AND bfp-2 IS SEPARATE RELAY MCTI40,ALSTOM make.For stage#2 tie feeders BFP-1 is in RET 670 and BFP-2

is in REC 670

yesyes for stage-1 tie feeders BFP-1 is in

REL670 AND bfp-2 IS SEPARATE RELAY MCTI40,ALSTOM make.For stage#2 tie feeders BFP-1 is in RET 670 and BFP-2

yes,except for tie feeders

yes

yes

18 BFP relay functional Yes/No yes yes yes yes19 BFP conditons: Current presence Yes/No20 BFP conditons: CB closed position Yes/No21 BFP retrip active (first stage) Yes/No22 Tripping time for BFP (second stage) 0.2s< t <0.3s Yes/No

23Are Breaker Failure potection auxiliary relay for Stage-1 (94BF) and Lock out relay for Stage-2 (86BF) provided with supervision relays (74/ 94BF & 74/86BF)

Yes/No

24 Do all the Breaker Failure protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)

Yes/No

yes

yesno

is in REC 670

yes

yes200msec


Annexure-VII

Page 24 of 27

DC system - check list

No DC supply systems 220V DC 1 220V DC 2 48V DC 1 48V DC 2

1 Type of BatteriesNon Sealed/Sealed lead with

recombination of gas/Nickel-Cadmium/Other

Nickel-Cadmium Nickel-Cadmium Nickel-Cadmium Nickel-Cadmium

2 Number of Cells per bank 169 169 38 383 Date of procurement/ commissioning of the Battery 2011 2011 2001 20014 Is the battery functional and in good condition? Yes/No yes yes yes yes5 Availability of Battery Charger Yes/No yes yes yes yes6 Date of procurement/ commissioning of the Charger 2011 2011 2001 20017 Is the Charger functional ? Yes/No yes yes yes yes

8 Used combination for chargingTwo sets of battery and charger /single battery with charger /one

battery with two chargersMeasured voltage (to be measured at the farthest panel) 240 V 240 V 48 V 48 VPositive to Earth 131 V 131 V 0 0Negative to Earth 109 V 120 V 48 48

10 Availability of Battery Ground Fault Detectors? Yes/No yes yes yes yes

12 The protection relays and trip circuits are segregated into two independent system feed through fuses from two different DC sources

Yes/No N/A N/A

Maintenance/ Testing PlanWhat is the maintenance/testing plan/schedule followed by the utility for maintenance of battery and charger?

13 six monthly

two sets of battery and chargers two sets of battery and chargers

9

yes


Annexure-VII

Page 25 of 27

AC system - check list

No Supply I Supply IIname of source ODHT-1 TRF 11/.415 KV ODHT-2 TRF 11/.415 KV

Yes/No yes yes415 V 415 V

Auto/Manual

Yes/No

Auto/Manual

3

1

AC Supply SystemSource of AC HT suppliesIn case of two AC HT supplies,the supplies are arranged from independent sourcesVoltage/Source of supplySupply changeover method between Supply I and Supply II

4 Maintenance/Testing PlanWhat is the maintenance plan/ schedule followed by the utility for maintenance of DG ? everyday

2

The SS to furnish the supply changeover scheme/ single line diagram

autoSupply changeover method between Normal AC Supply and DG auto

AutoDGDG available yesDG:Make and rating power Cummins,1500 KVA

What loads are supplied by the DG ?

Switchyard 220V charger-1,2,switchyard 48v charger-1,2,emergency lighting,primary water pump-37.5KW,PAPH-A-11KW,PAPH-B-11 KW,SAPH-A-18.5KW,SAPH-B-

18.5KW,SEAL OIL PUMP-2(4 KW,7.5KW),SAPH-18.5KW,AC JOP-60 KW,220 V Ch-1 main plant,TDBFP-AOP-2(90 KW each),VACCUM PUMP-132 KW,AOP-110 KW,GT MARSHALING

KIOSK-90KW and other auxillaries-10 KW (

DG starting is Auto/manual


Annexure-VII

Page 26 of 27

Communication system - check list

No Communication System 765 kV System 400 kV System 220 kV System 132 kV System

a) Type of communication for Main-1 Protection PLCC/ OPGWOPGW for stage#1,PLCC

for stage#2

b) Type of communication for Main-2 Protection PLCC/ OPGWOPGW for stage#1,PLCC

for stage#2

c) Mode used for Data communicationOPGW for stage#1,PLCC

for stage#2

d) Mode used for Speech communicationOPGW for stage#1,PLCC

for stage#2

PLCC Details

a) Do you use PLCC for teleprotection of distance relays ? Yes/NoOPGW for stage#1,PLCC

for stage#2

b) Specify type of Coupling Ph-Ph/ Ph-G/ Inter-Circuit Ph-Phc) Whether redundant PLCC channels provided for 400 kV & 765 kV lines Yes/ No yesd) Specify number of PLCC channels per circuit One/ Two Twoe) No. of protection channels No. of data channels

No. of speech channels2,2,1

f) Whether dependability & security of each tele-protection channel measured and record kept?

Yes/No PGCIL maintians the system

g) Is the PLCC equipment and channels healthy & functional Yes/No yesOPGW Detailsa) Redundancy maintained by providing two sets of Fibre Optic Equipment Yes/ No yesb) Card level redundancy (Power supply card, protection card, CPU board) maintained in each fibre optic equipment

Yes/ No APTRANSCO maintains the system

c) Separate DC battery supply or common DC battery supply separately fused for each fibre optic equipment.

Yes/No yes

d) Are the Fibre Optic equipment and channels healthy & functional Yes/No yesTime Synchronization Equipment Detailsa) Whether GPS based time synchronizing equipment is provided at the substation for time synchronizing of Main relays/ DR/ Event logger/ SAS/ PMU/ Line Current Differential Relays

Yes/ No yes

b) Are Time Synchronization Equipment (TSE) complete with antenna, all cables, processing equipments etc. provided to receive synchronizing pulse through Global Positioning system (GPS) compatible for synchronization of event logger, disturbance recorder and SCADA/ automation system.

Yes/ No yes

c) Are the Main Relays/ DR/ Event Logger/SAS/ PMU/ Line current differential relays time synchronized.

Yes/ No yes

Disturbance Recorder and Event Logger DetailsCheck all these items for individual relay.a) Is the Disturbance recorder provided on all the feeders of 765kV, 400 kV & 220 kV Substations?

Yes/ No yes

b) Is the Fault locator provided on all the line feeders of 765kV, 400 kV & 220 kV Substations?

Yes/ No yes

c) Whether the Disturbance recorder is Standalone or part of main relay Yes/ No part of maind) Whether Disturbance Recorder is having automatic fault record download facility to a central PC

Yes/ No yes

e) Disturbance Recorders functional ? Yes/ No yesf) Whether substation (765, 400, 220 kV) is having Event Logger facility (stand alone or built-in-SAS)

stand alone/ built-in-SAS built-in-SAS

g) Event Logger functional ? Yes/ No yes

4

5

1

2

3


Annexure-VII

Page 27 of 27

220kV KALAPAKA‐BRANDIX‐1No. Relay configuration - Line distance protection

1 Name and length of line2 Series compensated? Y/N3 Is this a cable feeder / line feeder/ composite feeder (line+cable)?4 Which mode of communication is used (PLCC/ OPGW)


Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 GE Make, D60 ALSTOM,MICOM P437Whether the relay is functional?? Yes/ No Yes YesDate of testing 26.04.2016 26.04.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21 21,51,51N




PLCC)

Permissive Underreach Permissive Underreach




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No NoBreaker failure active Yes/ No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No No NoFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC Supply -1 DC Supply -18 Connected to Dedicated CT core? Define CT core no. to which the relay is connected Core-5 Core-49 CT ratio selected 800/1 800/110 VT ratio selected 220kV/110V 220kV/110V11 Details of separate relays if applicable12 VT Fuse failure protection present & used to block distance function operation? Yes/No

Overvoltage protection available Yes/ NoFunctional with two stage protection Yes/No


Yes/No


Yes/No Yes

5

Yes

13 NON/A

Yes

220kV Kalapaka-Brandix-1, 20.18 kmsN

line feederPLCC

Kalpakka SS

Annexure-VIII

Page 1 of 41

220kV KALAPAKA‐BRANDIX‐2



Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 GE Make, D60 ALSTOM,MICOM P437Whether the relay is functional?? Yes/ No Yes YesDate of testing 18.04.2016 18.04.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21 21,51,51N




PLCC)





For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No NoBreaker failure active Yes/ No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No NO NOFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC Supply -2 DC Supply -28 Connected to Dedicated CT core? Define CT core no. to which the relay is connected Core-5 Core-49 CT ratio selected 800/1 800/110 VT ratio selected 220kV/110V 220kV/110V11 Details of separate relays if applicable12 VT Fuse failure protection present & used to block distance function operation? Yes/No



Yes/No


Yes/No Yes

Yes

13 NON/A

Yes

5

220kV Kalapaka-Brandix-2, 20.18 kmsN

line feederPLCC

Kalpakka SS

Annexure-VIII

Page 2 of 41

220kV KALAPAKA‐DAIRYFARM‐1



Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 ABB,REL100 ABB,REL316Whether the relay is functional?? Yes/ No Yes YesDate of testing 14.03.2016 14.03.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21 21,51




PLCC)





For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No NoBreaker failure active Yes/ No No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No Yes YesFault locator active? Yes/No YesDisturbance Recorder active? Yes/No Yes Yes No

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC supply 1 DC supply 2 8 Connected to Dedicated CT core? Define CT core no. to which the relay is connected Core 5 Core 49 CT ratio selected 800A/1A 800A/1A10 VT ratio selected 220kV/110V 220kV/110V

Details of separate relays if applicableRelay 1 make and model







Yes/No


Yes/No Yes

Yes

13 NoNo

Yes

5

Yes14.03.2016ABB, RAAAM

ABB, RAICA

Breaker Failure

11

Auto Reclose

No14.03.2016

220kV Kalapaka-Dairy Farm-1, 51.89 kmsN

line feederPLCC

Kalpakka SS

Annexure-VIII

Page 3 of 41

220kV KALAPAKA‐DAIRYFARM‐2







PLCC)














Yes/No


Yes/No Yes

Yes

13 NoNo

Yes

5

Yes04.01.2016ABB, RAAAM

ABB, RAICA

Breaker Failure

11

Auto Reclose

No04.01.2016

220kV Kalapaka-Dairy Farm-2, 51.89 kmsN

line feederPLCC

Kalpakka SS

Annexure-VIII

Page 4 of 41

220kV KALAPAKA‐VSS‐1







PLCC)














Yes/No


Yes/No Yes

Yes

13 NoNo

Yes

5

11Yes

09.12.2014ABB, RAAAM

Auto Reclose

No09.12.2014

ABB, RAICA

Breaker Failure

220kV Kalapaka-VSS-1, 3.70 kmsN

line feederOPGW

Kalpakka SS

Annexure-VIII

Page 5 of 41

220kV KALAPAKA‐VSS‐2No. Relay configuration - Line distance protection







PLCC)














Yes/No

15Do the Line Protection protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)?

Yes/No Yes

Yes

13 NoN/A

Yes

5

11Yes

31.03.2015ABB, RAAAM

Auto Reclose

No31.03.2015

ABB, RAICA

Breaker Failure

220kV Kalapaka-VSS-2, 3.70 kmsN

line feederOPGW

Kalpakka SS

Annexure-VIII

Page 6 of 41

400 kV KALAPAKA‐SIMHADRI‐1


Details of type relays Main-1 Relay Main-2 RelayOther Relays

(Back-up relays, DR, FL etc.)

Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 ABB,REL100 ABB,REL316Whether the relay is functional?? Yes/ No Yes YesDate of testing 26.05.2016 26.05.2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21 21,67N,51



reach/Intertripping Under reach/ Permissive

Overreach/ Blocking Over reach/ Phase Comparison

Protection (for PLCC)

Permissive Overreach (Current Reversal Guard

Logic implemented)


Logic implemented)




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No YesBreaker failure active Yes/ No No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No Yes NoFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes(External DR (i-650))

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC supply 1 DC supply 2

8 Connected to Dedicated CT core? Define CT core no. to which the relay is connected Core 5 Core 4

9 CT ratio selected 1000A/1A 1000A/1A10 VT ratio selected 400kV/110V 400kV/110V

400kV Kalapaka-Simhadri-1, 3.72kms

OPGW

Nline feeder

5

Kalpakka SS

Annexure-VIII

Page 7 of 41


No. Relay configuration - Line distance protection Details of separate relays if applicableRelay 1 make and model LBB


Relay 1 Functional Yes/ NoDate of TestingRelay 2 make and model Over Voltage stage-I


Relay 2 Functional Yes/ NoDate of TestingRelay 3 make and model Over Voltage stage-II


Relay 3 Functional Yes/ NoDate of TestingRelay 4 make and model Auto reclose





Yes/No


Yes/No Yes

ABB ,RAAAM

Auto reclose

Yes26.05.2016

Yes

Over Voltage

Yes26.05.2016

Yes

Yes

13 Yes

Yes26.05.2016ABB, RXEG

11


Over Voltage

ABB, RAICA

Breaker Failure

Kalpakka SS

Annexure-VIII

Page 8 of 41

400 kV KALAPAKA‐SIMHADRI‐2No. Relay configuration - Line distance protection











Logic implemented)


Logic implemented)






8 Connected to Dedicated CT core? Define CT core no. to which the relay is connected

Core 5 Core 4


5

400kV Kalapaka-Simhadri-2, 3.72kmsN

line feederOPGW

Kalpakka SS

Annexure-VIII

Page 9 of 41

400 kV KALAPAKA‐SIMHADRI‐2No. Relay configuration - Line distance protection

Details of separate relays if applicableRelay 1 make and model LBB

Functions available in Relay 1Auto reclose/ Breaker

Failure/ 67/67N/51/51N











12 VT Fuse failure protection present & used to block distance function operation? Yes/No



Yes/No


Yes/No

Breaker Failure

Yes

17.08.2016

Yes

13 YesYes

Yes

Yes

11


Over Voltage


Over Voltage

Yes17.08.2016ABB ,RAAAM

Auto reclose

ABB, RAICA

Kalpakka SS

Annexure-VIII

Page 10 of 41












Logic implemented)


Logic implemented)




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No YesBreaker failure active Yes/ No No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No Yes NoFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes(External DR (i-650))-N/W



Core 5 Core 4


5


line feederOPGW

Kalpakka SS

Annexure-VIII

Page 11 of 41


















Yes/No


Yes/No

Breaker Failure

Yes

16.09.2016

Yes

13 YesYes

Yes

Yes

11


Over Voltage


Over Voltage


Auto reclose

ABB, RAICA

Kalpakka SS

Annexure-VIII

Page 12 of 41












Logic implemented)


Logic implemented)







Core 5 Core 4


5


line feederOPGW

Kalpakka SS

Annexure-VIII

Page 13 of 41


















Yes/No


Yes/No

Breaker Failure

Yes

06.05.2016

Yes

13 YesYes

Yes

Yes

11


Over Voltage


Over Voltage


Auto reclose

ABB, RAICA

Kalpakka SS

Annexure-VIII

Page 14 of 41

400 kV KALAPAKA‐KHAMMAM‐1










Permissive Under reach Permissive Under reach







Core 5 Core 4


400kV Kalapaka-Khammam-1, 364 kmsN

line feederPLCC

5

Kalpakka SS

Annexure-VIII

Page 15 of 41


















Yes/No


Yes/No

ABB, RAICA

Breaker Failure

Yes

11


Over Voltage


Over Voltage


Auto reclose

Yes

05.08.2016

Yes

13 YesYes

Yes

Kalpakka SS

Annexure-VIII

Page 16 of 41


















Core 5 Core 4


400kV Kalapaka-Khammam-2, 364 kmsN

line feederPLCC

5

Kalpakka SS

Annexure-VIII

Page 17 of 41


















Yes/No


Yes/No Yes

Yes

13 YesYes

Yes

Auto reclose

ABB, RAICA

Breaker Failure

Yes

11


Over Voltage


Over Voltage


Kalpakka SS

Annexure-VIII

Page 18 of 41

400 kV KALAPAKA‐VEMAGIRI‐1

















Core 5 Core 4


400kV Kalapaka-Vemagiri-1, 166.93 kmsN

line feederPLCC

5

Kalpakka SS

Annexure-VIII

Page 19 of 41


















Yes/No


Yes/No

ABB, RAICA

Breaker Failure

Yes

11


Over Voltage


Over Voltage


Auto reclose

Yes

07.05.2016

Yes

13 YesYes

Yes

Kalpakka SS

Annexure-VIII

Page 20 of 41


















Core 5 Core 4


400kV Kalapaka-Vemagiri-2, 166.93 kmsN

line feederPLCC

5

Kalpakka SS

Annexure-VIII

Page 21 of 41


















Yes/No


Yes/No

ABB, RAICA

Breaker Failure

Yes

11


Over Voltage


Over Voltage


Auto reclose

Yes

30.07.2015

Yes

13 YesYes

Yes

Kalpakka SS

Annexure-VIII

Page 22 of 41

400 kV KALAPAKA‐GAJUWAKA‐1











Logic implemented)


Logic implemented)




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No YesBreaker failure active Yes/ No No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No Yes NoFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes(External DR (i-650))- N/W



Core 5 Core 4


400kV Kalapaka-PGCIL(GWK)-1, 3.39 kmsN

line feederOPGW

5

Kalpakka SS

Annexure-VIII

Page 23 of 41


















Yes/No


Yes/No

ABB, RAICA

Breaker Failure

Yes

11


Over Voltage


Over Voltage


Auto reclose

Yes

13.04.2016

Yes

13 YesYes

Yes

Kalpakka SS

Annexure-VIII

Page 24 of 41












Logic implemented)


Logic implemented)




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No No No YesBreaker failure active Yes/ No No No YesLoad Encroachment active Yes/ NoStub Protection active Yes/ No Yes NoFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes(External DR (i-650))- N/W



Core 5 Core 4


400kV Kalapaka-PGCIL(GWK)-2, 3.39 kmsN

line feederOPGW

5

Kalpakka SS

Annexure-VIII

Page 25 of 41


















Yes/No


Yes/No

ABB, RAICA

Breaker Failure

Yes

11


Over Voltage


Over Voltage


Auto reclose

Yes

22.09.2016

Yes

13 YesYes

Yes

Kalpakka SS

Annexure-VIII

Page 26 of 41

400/220 kV ICT-1Transformer protection - check list

No Relay configuration - Power Transformers protections

1 Name, voltage, power

2 Are used 2 groups of protections (Group A and Group B) for transformer protection?

Yes /No

3 Are Group A and Group B protections connected to separate DC sources for power transformers?

Yes /No

4Do the Group A and Group B protections have separate lockout relays?

Yes /No

A B A B

Details of composite type numerical relays 87T 64 67&67N (HV)

67&67N (LV) 99 (HV) 99 (LV) LBB(HV) LBB(LV)

Relay make and model ABB, RADSB ABB, RADHD ABB, RAPDK ABB, RAPDK

ABB, RALK ABB, RALK ABB, RAICA

ABB, RAICA

Whether the relay is functional? Yes /No Yes Yes Yes Yes Yes Yes Yes YesDate of testing 05.11.2015 05.11.2015 05.11.2015 05.11.2015 05.11.2015 05.11.2015 05.11.2015 05.11.2015Mention all the active protection Differential REF O/C + E/F O/C + E/F Over Fluxing Over Fluxing LBB LBBdifferential protections YesREF protection YesBack-up directional O/C +E/F protection Yes YesOverfluxing protection Yes YesConnected to Trip Coil 1/Trip Coil2/Both Both Both Both Both Both Both Both BothFeed from DC supply 1/DC supply2 DC Supply-1 DC Supply-2 DC Supply-1 DC Supply-2 DC Supply-1 DC Supply-2 DC Supply-2 DC Supply-2Breaker failure active Yes /No Yes YesDisturbance Report active Yes /No NO NO NO NO NO NO NO NOConnected to dedicated CT core?Define CT core no. to which the relay is connected

Core-5 Core-1 (Bushing CT)

Core-4 Core-4 Core-2 (BCVT)Core-3 (BVT) Core-4 Core-4

CT ratio selected Yes /No 500/1(HV), 1200/1(LV)

1000/1 500/1 1200/1 400kV/110V 220kV/110V 500/1 1200/1

Is CT supervision enabled or not in case of Transformer differential Yes /No

Yes

Yes

Yes

Back up

ICT-1 (315MVA, 400kV/220kV)

5

Details of type relays Main Other Protections

protection ?Yes /No

6Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ?

Yes/No

7Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)?

Yes/No

8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No11 LA rating IV side Yes/No 216kV, 10kA

YesYes

Yes

Yes

390kV, 10kA

Kalpakka SS

Annexure-VIII

Page 27 of 41

400/220kVICT‐2Transformerprotection‐checklistNo Relay configuration - Power Transformers protections1 Name, voltage, power

2 Are used 2 groups of protections (Group A and Group B) for transformer protection?

Yes /No


Yes /No

4 Do the Group A and Group B protections have separate lockout relays? Yes /No

A B A BDetails of composite type numerical relays 87T 64 67&67N (HV)67&67N (LV) 99 (HV) 99 (LV) LBB(HV) LBB(LV)

Relay make and model ABB, RADSBABB,

RADHDABB,

RAPDK ABB, RAPDK ABB, RALK ABB, RALKABB,

RAICAABB,

RAICAWhether the relay is functional? Yes /No Yes Yes Yes Yes Yes Yes Yes YesDate of testing 10.02.2015 10.02.2015 10.02.2015 10.02.2015 10.02.2015 10.02.2015 10.02.201510.02.2015Mention all the active protection Differential REF O/C + E/F O/C + E/F Over Fluxing Over Fluxing LBB LBBdifferential protections YesREF protection YesBack-up directional O/C +E/F protection Yes YesOverfluxing protection Yes YesConnected to Trip Coil 1/Trip Coil2/Both Both Both Both Both Both Both Both BothFeed from DC supply 1/DC supply2 DC Supply-1 DC Supply-2 DC Supply-1 DC Supply-2 DC Supply-1 DC Supply-2 DC Supply-2DC Supply-2Breaker failure active Yes /No Yes YesDisturbance Report active Yes /No NO NO NO NO NO NO NO NO


Core-5Core-1

(Bushing CT)Core-4 Core-4 Core-2 (BCVT) Core-3 (BVT) Core-4 Core-4


1000/1 500/1 1200/1 400kV/110V 220kV/110V 500/1 1200/1

Is CT supervision enabled or not in case of Transformer differential protection ?

Yes /No

5


ICT-2 (315MVA, 400kV/220kV)

Yes

Yes

Yes

Main Back up Other Protections

p6 Are all the Lock out relays (86) considered for Transformer protection Yes/No7 Do the Transformer protection panels have supervision relays for DC Yes/No8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No11 LA rating IV side Yes/No

390kV, 10kA216kV, 10kA

YesYesYesYes

Kalpakka SS

Annexure-VIII

Page 28 of 41

400/220 kV ICT-3 Transformer protection - check listNo Relay configuration - Power Transformers protections 1 Name, voltage, power2 Are used 2 groups of protections (Group A and Group B) for transformer protection? Yes /No


Yes /No


A B A B A B

Details of composite type numerical relays Differential(HV)

REF 67&67N (HV)

67&67N (LV)

LBB(HV) LBB(LV)

Relay make and modelALSTOM_

MiCom P643

ALSTOM_ MiCom P633

ALSTOM_ MiCom P141

ALSTOM_ MiCom P141

ALSTOM_ MiCom P141

ALSTOM_ MiCom P141

Whether the relay is functional? Yes /No Yes Yes Yes Yes Yes YesDate of testing 19.01.2015 19.01.2015 19.01.2015 19.01.2015 19.01.2015 19.01.2015Mention all the active protection Differential REF O/C + E/F O/C + E/F LBB LBBdifferential protections YesREF protection YesBack-up directional O/C +E/F protection Yes YesOverfluxing protection Yes(HV) Yes(LV)Connected to Trip Coil 1/Trip Coil2/Both Both Both Both Both Both BothFeed from DC supply 1/DC supply2 DC Supply-1 DC Supply-2 DC Supply-1 DC Supply-2 DC Supply-2 DC Supply-2Breaker failure active Yes /No Yes YesDisturbance Report active Yes /No Yes Yes Yes Yes Yes Yes


Core-5Core-1

(Bushing CT)Core-4 Core-4 Core-4 Core-4


1000/1 500/1 1200/1 500/1 1200/1

Is CT supervision enabled or not in case of Transformer differential protection ? Yes /No

5

Details of type relays Main Back up

Yes

Other Protections

ICT-3 (315MVA, 400kV/220kV)Yes

Yes

Yes

6Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ?

Yes/No

7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 Yes/No8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No11 LA rating IV side Yes/No

Yes390kV, 10kA216kV, 10kA

Yes

YesYes

Kalpakka SS

Annexure-VIII

Page 29 of 41

Shunt reactor protection - check listNo Relay configuration - Shunt reactor protections

1 Name,Voltage,Power

2 Are used 2 groups of protections (Group A and Group B) for shunt reactors protection?

Yes /No

3 Are Group A and Group B protections connected to separate DC sources for shunt reactors?

Yes /No


Back upA B A


Relay make and model ABB, RADHA ABB, RADHDABB,

RAKZBABB,

RAICAWhether the relay is functional? Yes /No Yes Yes Yes YesDate of testing 21.05.2016 21.05.2016 21.05.2016 21.05.2016

Mention all the active protection Differential REF Back-up Impedance

BFR

differential protection Yes REF protection YesBack-up directional O/C +E/F protection YesOverfluxing protection No No No NoConnected to Trip Coil1 / Trip Coil2 / Both Both Both Both BothFeed from DC supply 1/DC supply2 DC Supply-2 DC Supply-1 DC Supply-1 DC Supply-2B k f il ti Yes /No Yes

Yes

400kV Bus Reactor-1, 63 MVAR

Yes

Yes

4

Details of type relays Other Protection

Main

Breaker failure active Yes /No YesDisturbance Recorder active Yes /No No No No NoConnected to dedicated CT core?Define CT core no.to which the relay is connected

Core-1 Core-2 Core-3 Core-3

CT ratio selected 200/1 200/1 200/1 200/1

Is CT supervision enabled or not in case of Reactor differential protection ? Yes /No

5 Are all the Lock out relays (86) considered for Reactor protection provided with supervision relays (74/ 86) ?

Yes/No


Yes/No

7 OTI/WTI indications working Yes /No8 Bucholtz/PRD working Yes/No9 LA rating HV side Yes/No 390kV, 10kA

Yes

YesYes

Yes

No

Kalpakka SS

Annexure-VIII

Page 30 of 41

Shunt reactor protection - check list

No Relay configuration - Shunt reactor protections



Yes /No


Yes /No

4 Do the Group A and Group B protections have separate lockout relays? Yes /NoBack up

A B ADetails of composite type numerical relays

Relay make and model ABB, RADHA ABB, RADHD

ABB, RAKZB

ABB, RAICA

Whether the relay is functional? Yes /No Yes Yes Yes YesDate of testing 01.10.2015 01.10.2015 09.07.2016 01.10.2015


BFR

differential protection Yes REF protection YesBack-up directional O/C +E/F protection YesOverfluxing protection No No No NoConnected to Trip Coil1 / Trip Coil2 / Both Both Both Both BothFeed from DC supply 1/DC supply2 DC Supply-2 DC Supply-1 DC Supply-1 DC Supply-2Breaker failure active Yes /No YesDisturbance Recorder active Yes /No No No No No

Yes


Yes

Yes

4


Main



CT ratio selected 200/1 200/1 200/1 200/1Is CT supervision enabled or not in case of Reactor differential protection ? Yes /No


Yes/No


Yes/No


Yes

YesYes

Yes

No

Kalpakka SS

Annexure-VIII

Page 31 of 41





Yes /No


Yes /No



Relay make and model Siemens_ 7UT5121

Siemens_ 7SR11

Siemen_ 7SA610

Siemens_ 7SV6001



BFR

differential protection Yes REF protection YesBack-up directional O/C +E/F protection YesOverfluxing protection No No No NoConnected to Trip Coil1 / Trip Coil2 / Both Both Both Both BothFeed from DC supply 1/DC supply2 DC Supply-1 DC Supply-2 DC Supply-2 DC Supply-1Breaker failure active Yes /No YesDisturbance Recorder active Yes /No Yes YesConnected to dedicated CT core?

MainYes


Yes

Yes

4






Yes/No


Yes/No


No

Yes

YesYes

Yes

Kalpakka SS

Annexure-VIII

Page 32 of 41

Shunt reactor protection - check listNo Relay configuration - Shunt reactor protections



Yes /No


Yes /No



Relay make and model ABB, RADHA ABB, RADHD ABB, RAKZB

ABB, RAICA



BFR


Yes

400kV Khammam-1 Line Reactor, 63 MVAR

Yes

Yes

4


Main

Disturbance Recorder active Yes /No No No No NoConnected to dedicated CT core?Define CT core no.to which the relay is connected




Yes/No


Yes/No


Yes

YesYes

Yes

No

Kalpakka SS

Annexure-VIII

Page 33 of 41





Yes /No


Yes /No



Relay make and model ABB, RADHA ABB, RADHD ABB, RAKZB

ABB, RAICA



BFR


Yes

Yes

Yes

400kV Khammam-2 Line Reactor, 63 MVAR

4

MainDetails of type relays Other Protection

Disturbance Recorder active Yes /No No No No NoConnected to dedicated CT core?Define CT core no.to which the relay is connected




Yes/No


Yes/No


Yes

YesYes

Yes

No

Kalpakka SS

Annexure-VIII

Page 34 of 41

Synchro-check protections - check listNo Relay configuration - Synchro-check protections


1 Relay make and model ABB, RASC2 Whether the relay is functional? Yes /No Yes3 Date of testing4 Voltage measurement P-P or P-N P-N5 What is the set value of voltage difference (∆U) ? % 7.56 What is the set value of Phase angle difference (∆φ ) ? ° 57 What is the set value of frequency slip? (Δf) mHz 2008 What is the set time delay of output relay? (DELAY) sec 109 Settings value for dead bus/line % 30

Kalpakka SS

Annexure-VIII

Page 35 of 41

BB protection - check listNo BB and BF protection

BUSBAR PROTECTION1 Main BB available or not ? Yes/No

Back-up busbar protection to be provided by either of the following:

For 132kV & 220kV

- Remote -end distance relay overreaching elements (second zone)

Yes/No

- Reverse looking element of the local distance relay Yes/No - Directional back-up overcurrent relays at remote end. Yes/No



Main 1 relay Make for ex: REB 500Main 1 relay functional Yes/No

Main 1 relay type Low/High impendance

Connected to Trip Coil1 / Trip Coil2F d f DC l 1/DC l 2

BothBoth Both Both Both

5

ABB, RADSSABB, RADSS

High impendance

Yes

Both Both Both

ABB, RADSS ABB, RADSS

High impendanceHigh impendanceHigh impendance

Yes Yes Yes

Busbar 2 (BB2)

Yes Yes


Busbar 1(BB1)

Busbar 2 (BB2)

Busbar 1(BB1)

2 N/A

No No

N/A

Yes

Yes

220 kV 400 kV

N/A Yes

Yes Yes

Feed from DC supply 1/DC supply2Main 2 relay Make for ex: REB 500Main 2 relay functional Yes/No

Main 2 relay type Low/High impendance

Connected to Trip Coil 1/Trip Coil2Feed from DC supply 1/DC supply2

7 Trip to both coils in case of one BBP Yes/No

N/A6

Both Both Both Both

Yes Yes Yes Yes

Kalpakka SS

Annexure-VIII

Page 36 of 41

BB protection - check listNo BB and BF protection 220 kV 400 kV

BB1 Main-

1

BB1 Main-

2

BB2 Main-

1

BB2 Main-

2

BB1 Main-

1

BB1 Main-2

BB2 Main-

1

BB2 Main-

28 Dedicated CT core for each BB protection Yes/No Yes N/A Yes N/A Yes N/A Yes N/A

To be filled for High Impedance busbar protection N/A N/A N/A N/Aa) Is the high impedance protection used for simple busbar arrangement like 1 and 1/2 breaker scheme or single busbar arrangement

Yes/NoSingle Bus

N/ASingle Bus

N/ASingle Bus

N/ASingle Bus

N/A

b) Whether the CT ratios and charcteristics are same (Vk etc.) Yes/No Yes N/A Yes N/A Yes N/A Yes N/Ac) Whether stability check has been conducted? Yes/No Yes N/A Yes N/A Yes N/A Yes N/Ad) Is CT supervision relay provided or not? Yes/No Yes N/A Yes N/A Yes N/A Yes N/A

e) In case of busbar protection where isolator contacts are used for zone selectivity/ CT selection, please fill the below items:

N/A N/A N/A N/A

- Is check zone enabled or not?? Yes/No Yes N/A Yes N/A Yes N/A Yes N/A- Is Check zone measurement connected to separate CT cores ? Yes/No No N/A No N/A No N/A No N/A- If check zone Is not enabled, Is the relay setting increased to value higher than the heaviest loaded feeder current.

Yes/No N/A N/A N/A N/A

To be filled for Low Impedance busbar protection a) Centralised BBP Yes/Nob) or discentralized BBP with peripheral units? Yes/Nob) Whether stability check has been conducted? Yes/Noc) Is CT supervision enabled or not ? Yes/No

9

c) Is CT supervision enabled or not ? Yes/No

d)In case of busbar protection where isolator contacts are used for zone selectivity/ CT selection, please fill the below items:

- Is check zone enabled or not ? Yes/No- If check zone Is not enabled, Is the relay setting increased to value higher than the heaviest loaded feeder current.

Yes/No

10 N/A

Kalpakka SS

Annexure-VIII

Page 37 of 41

BB protection - check listNo BB and BF protection 220 kV 400 kV11 One zone for one bus Yes/No


Yes/No


Yes/No

BREAKER FAILURE PROTECTION14 Breaker failure included in BB protection Yes/No15 Breaker failure included in Line/transformer protections Yes/No16 Separate BFP provided Yes/No17 If separate BFP is provided, furnish Make/ Model18 BFP relay functional Yes/No19 BFP conditons: Current presence Yes/No20 BFP conditons: CB closed position Yes/No21 BFP retrip active (first stage) Yes/No22 Tripping time for BFP (second stage) 0.2s< t <0.3s Yes/No


Yes/No

24Do all the Breaker Failure protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)

Yes/No

ABB, RAICA ABB, RAICAYes Yes

Yes Yes

No No0.2s 0.2s

No No

Yes YesYes Yes

No NoYes Yes

No No

Yes Yes

Yes

NO NO

Yes

Kalpakka SS

Annexure-VIII

Page 38 of 41

DC system - check listNo DC supply systems 220V DC 1 220V DC 2 48V DC 1 48V DC 2



Sealed Maintenance Free VRLA




2 Number of Cells per bank 104 No's 104 No's 24 No's 24 No's3 Date of procurement/ commissioning of the Battery 03/05/2011 22/10/2009 12/06/2012 17/06/20164 Is the battery functional and in good condition? Yes/No Yes Yes Yes Yes5 Availability of Battery Charger Yes/No Yes Yes Yes Yes6 Date of procurement/ commissioning of the Charger 27/01/2002 27/01/2002 31/12/2001 04/07/20157 Is the Charger functional ? Yes/No Yes Yes Yes Yes

8 Used combination for charging

Two sets of battery and charger /single battery with charger /one battery with

two chargers

Measured voltage (to be measured at the farthest panel)

Positive to Earth 128 V 128 V 0 V 0 VNegative to Earth 102 V 102 V -48 V -48 V

10 Availability of Battery Ground Fault Detectors? Yes/No Yes Yes Yes Yes

12The protection relays and trip circuits are segregated into two independent system feed through fuses from two different DC sources

Yes/No N/A N/A

Maintenance/ Testing Plan

What is the maintenance/testing plan/schedule followed by the utility for maintenance of battery and charger?

13 Once in 15 Days

Two Sets of Battery & Charger Two Sets of Battery & Charger

9

Yes

Kalpakka SS

Annexure-VIII

Page 39 of 41

AC system - check listNo Supply I Supply II

name of source 33kV Parawada 33kV ChinagantyadaYes/No

Auto/Manual

Yes/No

Auto/Manual

3 The SS to furnish the supply changeover scheme/ single line diagram

ManualSupply changeover method between Normal AC Supply and DG manual

DG:Make and rating power Make:Cummins India Ltd 625kVAWhat loads are supplied by the DG ? 1.Control room2.Charging of battery banks .3.supply to compressors DG starting is Auto/manual

1.open the LV braeker of incomming AC supply 2.Start DG Set in idele condition for few minuits and then chage to running mode.3.After getting

the rated voltage close the DG set braker and then close the LV incomming braker.

DGDG available Yes

2

4

Maintenance/Testing Plan

What is the maintenance plan/ schedule followed by the utility for maintenance of DG ?

Once in every week DG set test run will be conducted for veryfying healthier operation

YES415V1

AC Supply SystemSource of AC HT suppliesIn case of two AC HT supplies,the supplies are arranged from Voltage/Source of supplySupply changeover method between Supply I and Supply II Manual

Kalpakka SS

Annexure-VIII

Page 40 of 41

Communication System DRNo Communication System 765 kV System 400 kV System 220 kV System REMARKS

a) Type of communication for Main-1 Protection PLCC/ OPGW PLCC/ OPGW PLCC/ OPGWb) Type of communication for Main-2 Protection PLCC/ OPGW PLCC/ OPGW PLCC/ OPGWc) Mode used for Data communication PLCC/ OPGW PLCC/ OPGWd) Mode used for Speech communication PLCC/ OPGW PLCC/ OPGWPLCC Detailsa) Do you use PLCC for teleprotection of distance relays ? Yes/No Yes Yesb) Specify type of Coupling Ph-Ph/ Ph-G/ Inter-Circuit Ph-Ph Ph-Phc) Whether redundant PLCC channels provided for 400 kV & 765 kV lines Yes/ No Yes Yesd) Specify number of PLCC channels per circuit One/ Two Two Onee) No. of protection channels No. of data channels

No. of speech channels

4 No's Protection & 1No. Data Channel and 2 No's Speech Channels

2 No's Protection & 1No. Data Channel and 2 No's Speech Channels

f) Whether dependability & security of each tele-protection channel measured and record kept?

Yes/No Yes Yes

g) Is the PLCC equipment and channels healthy & functional Yes/No Yes YesOPGW Detailsa) Redundancy maintained by providing two sets of Fibre Optic Equipment Yes/ No No Nob) Card level redundancy (Power supply card, protection card, CPU board) maintained in each fibre optic equipment

Yes/ No Yes Yes


Yes/No Yes Yes

d) Are the Fibre Optic equipment and channels healthy & functional Yes/No Yes YesTime Synchronization Equipment Detailsa) Whether GPS based time synchronizing equipment is provided at the substation for time synchronizing of Main relays/ DR/ Event logger/ SAS/ PMU/ Line Current Differential Relays

Yes/ No No No


Yes/ No Yes Yes


Yes/ No No No

Disturbance Recorder and Event Logger DetailsCheck all these items for individual relay.

a) Is the Disturbance recorder provided on all the feeders of 765kV, 400 kV & 220 kV Substations?

Yes/ No Yes No


Yes/ No Yes Yes

c) Whether the Disturbance recorder is Standalone or part of main relay Yes/ No Standalone Standaloned) Whether Disturbance Recorder is having automatic fault record download facility to a central PC

Yes/ No No No

e) Disturbance Recorders functional ? Yes/ No Yes Nof) Whether substation (765, 400, 220 kV) is having Event Logger facility (stand alone or built-in-SAS)

stand alone/ built-in-SAS Standalone Standalone

g) Event Logger functional ? Yes/ No Yes Yes

N/A

400kV Simhadri-3, PGCIL(GWK)-1&2

DRs are not working

Event Logger time is synchronizing with GPS

4

5

1

2

3

Kalpakka SS

Annexure-VIII

Page 41 of 41

400 kV KALPAKA-1 Line distance protection - check list



Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 ALSTOM MICOM P444 ABB REL670Whether the relay is functional?? Yes/ No Yes YesDate of testing 05-02-2016 05-02-2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67N/51/51N 21/67N/51/51N




PLCC)

Permissive over reach Permissive over reach




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No Yes YesBreaker failure active Yes/ No No NoLoad Encroachment active Yes/ No No NoStub Protection active Yes/ No Yes YesFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC-1 DC-28 Connected to Dedicated CT core? Define CT core no. to which the relay is connected 4 59 CT ratio selected 2000/1 2000/110 VT ratio selected 400/0,11 400/0,11

400kv Kalpaka Line-2/7.31 kmNO

Line FeederOPGW

5

Hinduja TPS 1/2

Annexure-IX

Page 1 of 12


No. Relay configuration - Line distance protection Details of separate relays if applicableRelay 1 make and model











Yes/No


Yes/No

11

Yes05-02-2016

AlSTOM MICOM P442

Auto Reclose

Yes05-02-2016

AlSTOM MICOM P141

Breaker Failure

Yes

Yes

13 YesYes

Yes

Hinduja TPS 2/2

Annexure-IX

Page 2 of 12




Details of composite type numerical relaysRelay make and model for ex: Siemens 7SA522 ALSTOM MICOM P444 ABB REL670Whether the relay is functional?? Yes/ No Yes YesDate of testing 13-06-2016 13-06-2016Mention all the active protections-21, 87L, 67, 67N, 51, 51N 21/87L/67/67N/51/51N 21/67N/51/51N 21/67N/51/51N




PLCC)

Permissive over reach Permissive over reach




For 87L which scheme is used? (Pilot wire communication/ digital communication)Power swing/out of step active? Yes/No Yes YesSOTF active? Yes/No Yes YesAuto Reclose (79) active? Yes/No Yes YesBreaker failure active Yes/ No No NoLoad Encroachment active Yes/ No No NoStub Protection active Yes/ No Yes YesFault locator active? Yes/No Yes YesDisturbance Recorder active? Yes/No Yes Yes

6 Relay Connected to Trip Coil-1/ Trip Coil-2 or both? Both Both7 Feed from DC supply 1 / DC Supply 2 DC-1 DC-28 Connected to Dedicated CT core? Define CT core no. to which the relay is connected 4 59 CT ratio selected 2000/1 2000/110 VT ratio selected 400/0,11 400/0,11

400kv Kalpaka Line-2/7.31 kmNO

Line FeederOPGW

5

Hinduja TPS 1/2

Annexure-IX

Page 3 of 12


No. Relay configuration - Line distance protection Details of separate relays if applicableRelay 1 make and model











Yes/No


Yes/No

11

Yes13-06-2016

AlSTOM MICOM P442

Auto Reclose

Yes13-06-2016

AlSTOM MICOM P141

Breaker Failure

Yes

Yes

13 YesYes

Yes

Hinduja TPS 2/2

Annexure-IX

Page 4 of 12

400/220 kV ICT-1 Transformer protection - check list

No Relay configuration - Power Transformers protections1 Name, voltage, power2 Are used 2 groups of protections (Group A and Group B) for transformer protection? Yes /No3 Are Group A and Group B protections connected to separate DC sources for power transformers? Yes /No4 Do the Group A and Group B protections have separate lockout relays? Yes /No

MainA A B C

Details of composite type numerical relaysRelay make and model AREVA/P643Whether the relay is functional? Yes /No YesDate of testing 18-02-2015Mention all the active protectiondifferential protections YesREF protection YesBack-up directional O/C +E/F protection YesOverfluxing protection YesConnected to Trip Coil 1/Trip Coil2/Both BothFeed from DC supply 1/DC supply2 YesBreaker failure active Yes /No YesDisturbance Report active Yes /No YesConnected to dedicated CT core?Define CT core no. to which the relay is connectedCT ratio selected Yes /No NoIs CT supervision enabled or not in case of Transformer differential protection ? Yes /No

6 Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ? Yes/No7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)? Yes/No8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No11 LA rating IV side Yes/No

AREVA/P643,220V DCYesYesYes

NoNA

5


YesYesYesYesYes

Hinduja TPS 1/1

Annexure-IX

Page 5 of 12

400/220 kV ICT-2 Transformer protection - check list

No Relay configuration - Power Transformers protections1 Name, voltage, power2 Are used 2 groups of protections (Group A and Group B) for transformer protection? Yes /No3 Are Group A and Group B protections connected to separate DC sources for power transformers? Yes /No4 Do the Group A and Group B protections have separate lockout relays? Yes /No

MainA A B C

Details of composite type numerical relaysRelay make and model AREVA/P643Whether the relay is functional? Yes /No YesDate of testing 04-03-2016Mention all the active protectiondifferential protections YesREF protection YesBack-up directional O/C +E/F protection YesOverfluxing protection YesConnected to Trip Coil 1/Trip Coil2/Both YesFeed from DC supply 1/DC supply2 YesBreaker failure active Yes /No YesDisturbance Report active Yes /No YesConnected to dedicated CT core?Define CT core no. to which the relay is connectedCT ratio selected Yes /No NoIs CT supervision enabled or not in case of Transformer differential protection ? Yes /No

6 Are all the Lock out relays (86) considered for Transformer protection provided with supervision relays (74/86) ? Yes/No7 Do the Transformer protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)? Yes/No8 OTI/WTI working Yes /No9 Bucholz/PRD working Yes/No10 LA rating HV side Yes/No11 LA rating IV side Yes/No NA

5


Yes

Other Protections

YesYesYesYes

Back up

AREVA/P643,220V DCYesYesYes

Yes

Hinduja TPS 1/1

Annexure-IX

Page 6 of 12

Synchro-check protections - check listNo Relay configuration - Synchro-check protections


1 Relay make and model Alstom & SKE2 Whether the relay is functional? Yes /No Yes3 Date of testing4 Voltage measurement P-Por P-N P-P5 What is the set value of voltage difference (∆U) ? % 46 What is the set value of Phase angle difference (∆φ ) ? ° 10˚7 What is the set value of frequency slip? (Δf) mHz 0.078 What is the set time delay of output relay? (DELAY) sec9 Settings value for dead bus/line % N.A

Hinduja TPS 1/1

Annexure-IX

Page 7 of 12

BB protection - check list

No BB and BF protectionBUSBAR PROTECTION

1 Main BB available or not ? Yes/NoBack-up busbar protection to be provided by either of the following: For 132kV & 220kV - Remote -end distance relay overreaching elements (second zone) Yes/No - Reverse looking element of the local distance relay Yes/No - Directional back-up overcurrent relays at remote end. Yes/No



Main 1 relay Make for ex: REB 500Main 1 relay functional Yes/NoMain 1 relay type Low/High impendanceConnected to Trip Coil1 / Trip Coil2Feed from DC supply 1/DC supply2Main 2 relay Make for ex: REB 500Main 2 relay functional Yes/NoMain 2 relay type Low/High impendanceConnected to Trip Coil 1/Trip Coil2Feed from DC supply 1/DC supply2

7 Trip to both coils in case of one BBP Yes/NoBB1

Main-1BB1

Main-2BB2

Main-1BB2

Main-2BB1

Main-1BB1

Main-2BB2

Main-1BB2

Main-2BB1

Main-1BB1

Main-2BB2

Main-1BB2

Main-28 Dedicated CT core for each BB protection Yes/No

To be filled for High Impedance busbar protection a) Is the high impedance protection used for simple busbar arrangement like 1 and 1/2 breaker scheme or single busbar arrangement

Yes/No

b) Whether the CT ratios and charcteristics are same (Vk etc.) Yes/Noc) Whether stability check has been conducted? Yes/No

Yes

2

N/AN/A

220 kV 400 kV 765 kV

N/A N/AN/A

N/AYes N/A


1 and 1/2 Circuit Breaker scheme

Busbar 1(BB1)

Busbar 2 (BB2)

Yes Yes5

ALSTOM P741 ALSTOM P741

Busbar 1(BB1)

Busbar 2 (BB2)

Busbar 1(BB1)

Busbar 2 (BB2)

Yes

Low LowBoth 1&2 Both 1&2

6

ALSTOM P741

Low Low

ALSTOM P741Yes

Yes Yes

c) Whether stability check has been conducted? Yes/Nod) Is CT supervision relay provided or not? Yes/Noe) In case of busbar protection where isolator contacts are used for zone selectivity/ CT selection, please fill the below items:- Is check zone enabled or not?? Yes/No- Is Check zone measurement connected to separate CT cores ? Yes/No- If check zone Is not enabled, Is the relay setting increased to value higher than the heaviest loaded feeder current.

Yes/No

9

Hinduja TPS 1/2

Annexure-IX

Page 8 of 12

BB protection - check list

No BB and BF protection 220 kV 400 kV 765 kVTo be filled for Low Impedance busbar protection a) Centralised BBP Yes/No Yesb) or discentralized BBP with peripheral units? Yes/Nob) Whether stability check has been conducted? Yes/Noc) Is CT supervision enabled or not ? Yes/Nod)In case of busbar protection where isolator contacts are used for zone selectivity/ CT selection, please fill the below items:- Is check zone enabled or not ? Yes/No Yes- If check zone Is not enabled, Is the relay setting increased to value higher than the heaviest loaded feeder current.

Yes/No

11 One zone for one bus Yes/No


Yes/No


Yes/No

BREAKER FAILURE PROTECTION14 Breaker failure included in BB protection Yes/No15 Breaker failure included in Line/transformer protections Yes/No16 Separate BFP provided Yes/No17 If separate BFP is provided, furnish Make/ Model18 BFP relay functional Yes/No19 BFP conditons: Current presence Yes/No20 BFP conditons: CB closed position Yes/No21 BFP retrip active (first stage) Yes/No22 Tripping time for BFP (second stage) 0.2s< t <0.3s Yes/No


Yes/No

24 Do all the Breaker Failure protection panels have supervision relays for DC supply-1 & DC supply-2 (74/DC-1 & 74/DC-2)

Yes/No

Yes

10

Yes

YesYes

Yes

ALSTOM P141

YES

Hinduja TPS 2/2

Annexure-IX

Page 9 of 12

DC system - check list

No DC supply systems 220V DC 1 220V DC 2 48V DC 1 48V DC 2



Non sealed Nickel-Cadmium Non sealed Nickel-Cadmium Non sealed Nickel-Cadmium Non sealed Nickel-Cadmium

2 Number of Cells per bank 170 170 38 383 Date of procurement/ commissioning of the Battery4 Is the battery functional and in good condition? Yes/No Yes Yes Yes Yes5 Availability of Battery Charger Yes/No Yes Yes Yes Yes6 Date of procurement/ commissioning of the Charger7 Is the Charger functional ? Yes/No Yes Yes Yes Yes

8 Used combination for chargingTwo sets of battery and charger /single battery with charger /one

battery with two chargers Measured voltage (to be measured at the farthest panel) 245 239.5 53.6 53.5Positive to Earth 129.9 125.5Negative to Earth 115.5 114.5

10 Availability of Battery Ground Fault Detectors? Yes/No Yes Yes Yes Yes

12 The protection relays and trip circuits are segregated into two independent system feed through fuses from two different DC sources

Yes/No N/A N/A

Maintenance/ Testing PlanWhat is the maintenance/testing plan/schedule followed by the utility for maintenance of battery and charger?

13 Monthly

Single Battery Bank with Charger Single Battery Bank with Charger

9

Yes

Hinduja TPS 1/1

Annexure-IX

Page 10 of 12

AC system - check list

No Supply I Supply IIname of source 11KV Switch gear of ST-1 11KV Switch gear of ST-2

Yes/No Yes Yes400v 400v

Auto/Manual

Yes/No

Auto/Manual

3

1

AC Supply SystemSource of AC HT suppliesIn case of two AC HT supplies,the supplies are arranged from independent sourcesVoltage/Source of supplySupply changeover method between Supply I and Supply II

4 Maintenance/Testing PlanWhat is the maintenance plan/ schedule followed by the utility for maintenance of DG ? Monthly

AutoDGDG available Yes

2

The SS to furnish the supply changeover scheme/ single line diagram

AutoSupply changeover method between Normal AC Supply and DG Auto

DG:Make and rating power Cummins/1500KVAWhat loads are supplied by the DG ? Emergency/Lighting LoadsDG starting is Auto/manual

Hinduja TPS 1/1

Annexure-IX

Page 11 of 12

Communication system - check list

No Communication System 765 kV System 400 kV System 220 kV System 132 kV Systema) Type of communication for Main-1 Protection PLCC/ OPGW OPGWb) Type of communication for Main-2 Protection PLCC/ OPGW OPGWc) Mode used for Data communicationd) Mode used for Speech communicationPLCC Detailsa) Do you use PLCC for teleprotection of distance relays ? Yes/Nob) Specify type of Coupling Ph-Ph/ Ph-G/ Inter-Circuitc) Whether redundant PLCC channels provided for 400 kV & 765 kV lines Yes/ Nod) Specify number of PLCC channels per circuit One/ Twoe) No. of protection channels No. of data channels

No. of speech channelsf) Whether dependability & security of each tele-protection channel measured and record kept?

Yes/No

g) Is the PLCC equipment and channels healthy & functional Yes/NoOPGW Detailsa) Redundancy maintained by providing two sets of Fibre Optic Equipment Yes/ No Yesb) Card level redundancy (Power supply card, protection card, CPU board) maintained in each fibre optic equipment

Yes/ No Yes


Yes/No UPS is provided

d) Are the Fibre Optic equipment and channels healthy & functional Yes/No YesTime Synchronization Equipment Detailsa) Whether GPS based time synchronizing equipment is provided at the substation for time synchronizing of Main relays/ DR/ Event logger/ SAS/ PMU/ Line Current Differential Relays

Yes/ No Yes


Yes/ No Yes


Yes/ No Yes

Disturbance Recorder and Event Logger DetailsCheck all these items for individual relay.a) Is the Disturbance recorder provided on all the feeders of 765kV, 400 kV & 220 kV Substations?

Yes/ No Yes


Yes/ No Yes

c) Whether the Disturbance recorder is Standalone or part of main relay Yes/ No Yesd) Whether Disturbance Recorder is having automatic fault record download facility to a central PC

Yes/ No

e) Disturbance Recorders functional ? Yes/ No Yesf) Whether substation (765, 400, 220 kV) is having Event Logger facility (stand alone or built-in-SAS)

stand alone/ built-in-SAS Built-in-SAS

g) Event Logger functional ? Yes/ No Yes

4

5

1

2

3

NA

Hinduja TPS 1/1

Annexure-IX

Page 12 of 12

1. NTPC-Simhadri STPS (Pic-1)


Annexure-X

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Annexure-X

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Annexure-X

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8. Hinduja TPS (Pic-8)

Annexure-X

Page 4 of 6

9. Kalpaka SS (Pic-1) 10. Kalpaka SS (Pic-2)

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11. Kalpaka SS (Pic-3) 12. Kalpaka SS (Pic-4)

*****

Annexure-X

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Documents

SOUTHERN REGIONAL POWER COMMITTEE … REGIONAL POWER COMMITTEE BENGALURU Minutes of the Meeting of Protection System Analysis Group - 17 (PSAG-17) held on 3rd & 4th October, 2016 at