SOUTHERN REGIONAL POWER COMMITTEE - · PDF fileSOUTHERN REGIONAL POWER COMMITTEE ... Single line diagram of the station with switching devices, ... 765/400kV ICT-1 at Thiruvelam

SOUTHERN REGIONAL POWER COMMITTEE

BANGALORE

Agenda for the 43

rd Meeting of Protection Coordination Sub-Committee of

SRPC to be held on 29.04.2015 Wednesday)

1. Introduction

2. Confirmation of Minutes of last PCSC meeting

Confirmation of minutes of 42nd

Protection Coordination Sub-Committee meeting

held on 26.03.2015.

3. Grid Occurrences (w.r.t. SRLDC)

3.1 Grid Disturbance (GD), Grid Incidences (GI), and trippings due to failure of Auto-

reclosing (A/R), and Mal-operation of PLCC equipment that occurred during the

last one-month period (March-April, 2015) would be discussed in the PCSC meeting [Annexure-I]

Constituents are requested to furnish the following information in respect of the

above grid occurrences to have fruitful discussions in the PCSC forum.

(a) Single line diagram of the station with switching devices, CT, PT and relay

details

(b) Relay settings adopted

(c) Remedial measures/ Action taken

3.2 In compliance of Regulations 5.2 (r) of IEGC – as per the provisions under clause

1.5 of IEGC 2010, the Constituents are requested to furnish the following information in respect of Grid Occurrences (indicated as in Annexure-II) latest

by 20.04.2015:

(a) First Information Report (FIR)

(b) Event Logger (EL) output

(c) Disturbance Recorder (DR) output

(d) Trip event analysis report (with pre and post fault system conditions)

Non-furnishing of Tripping details including Disturbance Recorder/Sequential

Event logger output would be discussed in the meeting.

4. Kudankulam SPS (load relief by the constituents) with 2 Units in operation

A meeting was held with NPCIL/ KKNPP on 07.04.2015 at SRPC, Bengaluru to

discuss the operational and accounting issues in respect of KKNPP Units. In the

meeting, the following issues with respect to Kudankulam SPS were noted:

Presently Trip Signal 1 only was commissioned and would be triggerred when

power loss on account of tripping of Units at Kudankulam is more than 500 MW

Agenda for the 43rd Protection Coordination Sub Committee Meeting to be held on 29.04.2015 Page 2

and would be sent via Kolar to shed loads in Andhra Pradesh, Tamil Nadu,

Karnataka, Kerala.

It was noted that the SPS for two units in operation needed to be configured at

KKNPP. Constituents were to identify additional loads of 700-800 MW for Trip

Signal-2. As per NLDC new feeders are to be identified by the SR-Constituents

for the above quantum of load shedding.

It was agreed that the implementation of SPS (for 2 units in operation) would

be deliberated in the next Protection Sub Committee Meeting as the Unit II was

likely to be synchronized shortly.

5. Submission of reports/compliance by Constituents

5.1 Status of pending Protection Coordination Sub-Committee (PCSC)

Recommendations

Status of the pending PCSC recommendations (from 30th

PCSC to 41st PCSC) as

circulated vide our email dated 01.04.2015 (Annexure-III) may please be sent

latest by 24.04.2015.

5.2 Remedial measures for "Transmission Line under Forced Outage"

The constituents are requested to send the remedial measures/ actions taken by them for the tripping events as circulated vide our emails. (Annexure-IV)

The trip events are based on the daily reports at SRLDC website

http://srldc.in/DailyReport.aspx under the menu: Reports->Daily-> "TL under

Forced Outage")

5.3 Certificate for Healthiness of Batteries

As per the MoP direction given in pursuant to recommendations of the

Enquiry Committee (NEW grid disturbance on 30th

& 31st July, 2012), RPC’s

are required to obtain from their respective Constituents the monthly

certificate for healthiness of batteries, installed at 220 KV and above voltage

level Substations (for power supply to Relays, RTUs and PLCC equipment)

and furnish the same to CEA/ MoP.

With reference to above, the Constituents are requested to submit the

certificate on healthiness of batteries on monthly basis (i.e. on 7th

day of the

month) to SRPC.

The sought status for the month of February, 2015 is still awaited from the

following SR-Constituents:

APTRANSCO, TSGENCO (Hydro), KPTCL, PED, PGCIL (SR-II),

NTPC-Ramagundam, NTECL, GMR, NTPL, CEPL, SEPL.

6. Network Configuration Changes

As per the information furnished by SR-Constituents to the OCC forum in their 105th

Meeting held on 10.03.2015 (Minutes circulated on 28.03.2015), it is observed that no

network configuration changes (additions/ deletions/ modifications of transmission

elements) took place in southern grid during the month of February, 2015.

http://srldc.in/DailyReport.aspx


KPTCL vide their mail dated 25.03.2015 informed that the following new transmission

elements had been added in the month of March, 2015.

Sl. No.

Name of the Element

Connected Sub Station

Date and time of Commissioning

Remarks

1 220kV Hiriyur-Gowribidanur

D/C line

Hiriyur PGCIL and

Gowribidanur SS

4.3.2015 at 21.10 and 21.15Hrs

Load taken on 9.3.2015 at 21.22 and 21.26Hrs

2 63MVAR Bus Reactor

400kV SS Guttur 23.03.2015 at 15.57Hrs

7. Dynamic study data submission

In the earlier meetings of PCSC, the forum had decided to collect the Dynamic

study data from the utilities to study the Southern Region system. The dynamic

study format was circulated to the constituents to send the Generator, Excitation

system, Governor, HVDC parameters. The forum opined that the dynamic study

details of the IPPs also are necessary to conduct the study of SR system.

All the SLDCs were requested to direct the embedded IPPs connected at 220 KV

and above voltage level to send the completed dynamic study format to SRPC,

Secretariat.

It is requested that the dynamic study data in the stipulated format may be sent to

SRPC at the earliest by email.

8. Protection Logic checking of Critical Substations

Logic checking of following Critical Substations in the Southern Region had been

approved in the SRPC meeting held on 18.05.2013 at Bangalore.

(i) 400 kV Guttur (vi) 400 kV Kurnool

(ii) 400 kV Ramagundam (vii) 400 kV Almatti

(iii) 400 kV Kalpaka (viii) 220 kV Edamon

(iv) 400 kV Nelamangala (ix) 400 kV VTS

(v) 400 kV Hoody (x) 400 kV Vemagiri

9. Compliance of Hon’ble CERC Orders.

9.1 Petition No. 146/MP/2013 with I.A. 36/2013: Order dated 20.02.2014

Compliance of Regulations 5.2 (r) of the Grid Code: Issue regarding non-

furnishing of FIR / Trip Analysis Report, EL, DR, etc. was also

highlighted. It is pointed out that the above reports are to be submitted /

uploaded on SRLDC web application within 24 hours as mandated under

IEGC / CEA Regulations.

Implementation of Phase-I and Phase-II of Protection Audit

Recommendations: All the constituents are requested to submit the updated

status of the compliance (those who have not completed recommendations

mentioned in the Phase I and Phase II) to SRPC Secretariat at the earliest.

The following constituents are to submit the updated status of filing of


petition/affidavit to SRPC Secretariat at the earliest: APTRANSCO.

Compliance of Regulations 5.2 (e) & 5.2 (l) of the Grid Code and Regulation

3(1)(e) of CEA Grid Standards: The constituents are requested to strictly

comply with these provisions by ensuring standard protections systems having

the reliability, selectivity, speed and sensitivity to isolate the faulty equipment

and protect all components from any type of faults, within the specified fault

clearance time and providing protection coordination

Ensuring proper maintenance of transmission lines and adopting best O&M

practices: The constituents are requested to conduct line patrolling regularly

as per the SRPC transmission line patrolling guidelines (available under the

menu item "All Uploads Operation Miscellaneous Transmission Line

Patrolling Protocol / Guidelines for Southern Region" on SRPC website).

(http://www.srpc.kar.nic.in/website/2014/operation/patrolling.pdf).

9.2 Petition No. 167/Suo- Motu/2012: Order dated 22.02.2014

The Constituents are requested to follow approved protection philosophy

ISTS licensees are requested to submit details of updated distance protection relay

setting of all inter-regional lines to POSOCO & RPCs.

All SLDCs are requested to install/activate sound recording system in their control

rooms within three months from the date of issue of this order.

The Constituents are requested to submit the progress of implementation to

SRPC and SRLDC as specified in the Hon'ble CERC Order.

9.3 Petition No. 263/MP/2012: Order dated 19.12.2013

Constituents are requested to implement the quantum of relief by AUFR and df/dt

relays by identifying additional feeders and keep them functional within one month

of issuing this order.

SLDCs are also requested to map these relays on their respective SCADA

system within three months of issuance of this order.

The Constituents are requested to submit the progress of implementation to

SRPC and SRLDC as specified in the Hon'ble CERC Order.

10. Other Protection Issues, if any, with the permission of the Chair

11. Sending Agenda items for the PCSC meetings

As per the Guidelines of CEA/MOP, it has been decided to conduct the PCSC

meetings on monthly basis. It is requested that Agenda Items for the PCSC meetings,

if any, may please be sent latest by 5th

working day of the month to SRPC Secretariat

to compile and circulate the same so as to have fruitful discussions in the PCSC

meetings.

12. Date of next PCSC meeting

The 44th

PCSC meeting would be conducted on 28.05.2015 (Thursday) at SRPC,

Bangalore.

*******

http://www.srpc.kar.nic.in/website/2014/operation/patrolling.pdf

Gird occurrences

1. / - Details of Grid Disturbances:

Sr. No.

. . /

Details of Event

/ Date &

मय /Time / Reason

/Remarks

/ Category

1

Disturbance in

North Kerala

system

02-04-2015

at 00:32 hrs Complete outage of 220kV

Mylatty, 220kV Taliparamba,

220kV Kanhirode and 220kV

Vadakara substations occurred

due to tripping of 220kV

Areakode-Vadakara and 220kV

Areakode-Kanhirode feeders.

220kV Areakode-Nallanam line-

2 also got tripped during the

incident.

Load loss : 313 MW

GD-1

2. / - Details of Grid incidents:

Sr. No.

.

.

/

Details of Event

/ Date &


/Remarks

/ Category

1

Tripping of

765/400kV ICT-1 at

Thiruvelam

substation

25-03-2015 at 20:25 hrs

AC Supply failed during pump

operation and oil return valve of

ICT-B phase mal operated

2

Multiple tripping at

400/230kV Hosur

substation of

Powergrid

26-03-2015 at 15:40 hrs

230kV Bus-2 at Hosur(PG) got

tripped as spurious initiation got

extended to LBB relay of 230kV

Hosur-Hosur(PG) line at

Hosur(PG) end due to shorting of

contacts in lockout relay.

400/230kV ICT-2, ICT-3, 230kV

Hosur-Vinnamangalam, 230kV

Hosur(PG)-Hosur which were

connected to Bus-2 got tripped

along with bus coupler breaker

GI-2

3

Tripping of 400kV

Kaiga-Guttur line-

1&2

27-03-2015at

14:33 hrs Line-1&2 tripped on operation of

over voltage stage-2 protection at

Guttur end and direc trip was

received at Guttur.

4

Tripping of

400/220kV ICT -2 at

Mahboobnagar

28-03-2015 at 6:40 hrs

ICT tripped on operation of REF

protection

5

Tripping of 400kV

Alamathy-

SVChatram line-

1&2 and 400/230kV

ICT at S.V.Chatram

29-03-2015

at 15:29 hrs Line-2 tripped on R-phase to earth fault. Line autoreclosed at SVChatram end and failed to reclose at Alamathy end. B-phase to earth fault in line-1. Line tried for for A/r but due to permanent fault line did not reclose. ICT tripped on operation of over flux protection

GI-2

Annexure-I

Sr. No.

.

.

/

Details of Event

/ Date &


/Remarks

/ Category

6

Tripping of VTPS-

Malkaram line-2 30-03-2015

at 11:51 hrs R-phase to earth fault occurred in

line, protection at Malkaram

sensed fault in zone-1 and in

zone-3 at VTPS end.

7

Tripping of HVDC

Talcher-Kolar pole-1 30.03.2015 at

19:30 hrs Pole 1 generated ESOF at Kolar

end on operation of O/C+ E/F

relay of the Converter

Transformer.

GI-2

8

Tripping of

400/220kV ICT-1 at

BTPS

31-03-2015

at 05:06 hrs ICT-1 tripped on operation of

Back up earth fault protection

during R-phase to earth fault in

220kV BTPS-Lingapur line.

9

Tripping of 400kV

Kurnool-Srisailam

01-04-2015

at 12:59 hrs

and 14:59 hrs

Line tripped on operation of

STUB protection at Kurnool end.

From D.R of Kurnool station, I>4

i.e. overcurrent trip was observed.

10

Tripping of 220kV

Sedam-Tandur line

06-04-2015

at 13:55 hrs

Line tripped at Sedam end only on

operation of Over Current and

Master trip relay

11-04-2015

at 18:12 hrs

Tripped at Sedam end only

11

Tripping of Talcher-

Kolar pole -1

09-04-2015

at 12:04 hrs

HVDC Talcher-Kolar Pole-2

tripped due to Converter

transformer R-ph OLTC PRV

micro switch mal operation at

Kolar.

12

Multiple tripping at

400kV Raichur(PG)

and Raichur thermal

power station of

KPCL

11-04-2015

at 18:04 hrs

400kV Raichur(PG)-Gooty line-2,

400kV Raichur TPS-Raichur(PG)

line-1&2, 400kV Raichur-

Mahboobnagar, Unit#5 at RTPS

tripped during the incident

GI-2

13

Tripping of HASSAN

- UPCL 1 12-04-2015

at 12:58 hrs

B-phase to earth fault in line. Line

tripped in zone-2 from Hassan end

14

Tripping of

400/220kV ICT-1 at

BTPS

14-01-2015

at 1:09 hrs

ICT tripped due to operation of

Over current and Earth fault relay

Annexure-I

3. Lines tripping due to PLCC mal-operation/ tripping at one end

Sr. No.

.

.

/

Details of Event

/ Date &


/Remarks

/ Category

1

400kV Guttur-

Narendra line-1 11-03-2015 at 17:16 hrs

line tripped at Narendra end only

on direct trip receive and line was

holding from Guttur

--

2 Tripping of 400kV

Guttur-Hiryur line-1 16-03-2015

at 14:10 hrs Line tripped at Guttur end only

and was holding from hiryur.

3

Tripping of 220kV

Regulapadu-Alipur

line

11-04-2015

at 18:13 hrs

Tripped at Alipur end only and

line was holding from Ragulapadu

end

4. Failure or non-operation of Auto reclose during transient fault

Sr. No.

Element Date & Time

Reason

1 Tripping of 220kV Chitoor-

Tiruvelam line 19-03-2015 at 15:18 hrs

Line tripped on R-phase to earth fault. Line did not autoreclose. D.R/ E.L not provided

2

Tripping of 220kV Ambewadi-

Ponda line-1 19-03-2015 at 18:55 hrs

Line tripped on operation of B-

phase to earth fault. Line dis not

auto reclose

3

Tripping of 400kV

Krishnapatnam-Nellore line 20-03-2015 at 03:02 hrs

Line tripped on a B-phase to earth

fault. From D.R and E.L of

Nellore end, auto reclose could

not be verified. Data of

Krishnapatnam was not submitted

4

Tripping of 400kV Khammam-

Kalpakka line-1&2 on 22-03-

2015

22-03-2015 at

14:45 hrs Attempt for auto-reclose could not

be established at Khammam end.

Current could not be observed in

current channels of D.R of

Kalpakka. E.L of Kalpakka

Station was not furnished. Time

difference is observed in D.R of

Khamman and Kalpakka. Also

Time sync needs to be checked

for E.L of Khammam.

5

Tripping of 400kV Hyderabad-

Kurnool line

01-04-2015 at

12:59 hrs

Y-phase to earth fault had

occurred in line. At Hyderabad

end line did not try auto-reclose as

there was CB A/R lockout. At

Kurnool end line tried for auto-

reclose after occurrence of fault in

Y phase. Due to persistent fault

line tripped.

6

Tripping of 400 kV NCTPS -

Vallur 2

03-04-2015 at

22:10 hrs

Line tripped on Y-phase to earth

fault. Line auto reclosed at Vallur

end and did not reclose at NCTPS

end

Annexure-I

7


Vallur 2

07-04-2015 at

2:41 hrs


fault. Line did not reclose at

NCTPS end. From Vallur end E.L

and D.R A/r start is observed.

Successful A/r at Vallur could not

be established with D.R and E.L

8


Vallur 2

07-04-2015 at

23:13 hrs




end

9


Vallur 1

08-04-2015 at

22:28 hrs

Line tripped on R-phase to earth



end

10


Vallur 1

11-04-2015 at

4:29 hrs




end

11


Vallur 1

12-04-2015 at

3:47 hrs




end

12

Tripping of 400 kV DICHIPALLY

- RAMAGUNDAM 05-04-2015 at

13:43 hrs


fault. Unsuccessful A/r or attempt

for A/r could not be established

with furnished D.R/ E.L

13 Tripping of 400 kV TALAGUPPA

- NEELAMANGALA 11-04-2015 at 2:22

hrs

Line tripped on Y-N Fault. Na

data available to establish A/r

14

Tripping of 400kV Raichur-

BTPS line

11-04-2015 at

17:52 hrs

Tripped due to B-phase fault.

Status of implementation of A/r

scheme for the line

15

Tripping of 400 kV Nellore –

Sriperambadur line 12-04-2015 at

20:37 hrs


fault. Line autoreclosed during 1st

attempt and during 2nd

fault, line

did not trip but R-pole got opened

and remaining poles opened due

to pole discrepancy.

16

Tripping of 220kV Idukki-

Udumalpet line

03-04-2015 at hrs B-phase to earth fault in line. Line

autoreclosed at Udumalpet end

and did not reclose at iddukki

12-04-2015 at 1:43

hrs

R-phase to earth fault in line. Line

autoreclosed at Udumalpet end.

Line tripped in zone-2 from

idukki

12-04-2015 at

15:12 hrs

B-phase to earth fault in line. Line

autoreclosed at Udumalpet end

and did not reclose at iddukki

Annexure-I

Annexure-II

Annexure-II

Annexure-II

Annexure-II

Annexure-II

Annexure-II

Annexure-II

Meeting No /

Index

Details of Event Date Reason PCSC Recommendations Utility Responsible for

implementation

Status of Recommendations

as on 16.04.2015

Remarks

39/III/1 Tripping of 400kv

VTPS-Satenapalli line-

1 &2

10, 11, 13, 14,15

Dec 2014 voltage.

grading in over voltage protection

needs to be verified.

PCSC forum recommended APTRANSCO to check up the

drop off to pick up ratio of the Overvoltage relay and correct

it (if needed).

APTRANSCO/ APGENCO APTRANSCO informed vide their e-mail dated

27.02.15 that the issue pertains to APGENCO.

Pending

40/IV/2 400 kV HYDERABAD -

KURNOOL line

07-01-2015

at 6:17 hrs

Line tripped on Rphase to earth

fault. A/R lock out

observed in E.L of Hyderabad end

APTRANSCO was requested to check up the A/R feature at

both the ends and submit the remedial measures to the PCSC

forum.

APTRANSCO Yet to be informed Pending

41/II/2 Tripping of 400kV

Srisailam-Mamidapalli-2

line and 400kV Srisailam-

Satenapalli-1 line

23-01-2015 at

16:10 hrs

Bus-2 at Srisailam became dead

while converting Srisailam generator

to condenser mode. Direct trip was

received at Mamidapalli and

Satenapalli end.

furnish the reasons for BBP operation at

Srisailam LLB and the remedial action taken to PCSC forum.

TSGENCO Yet to be informed Pending

30/I/A RTPS Tripping incidents

and the Spl meeting held

at RTPS on 13th and

14th March 2014

Mar-14 Spl meeting held at RTPS on 13th

and 14th March 2014

The PCSC forum recommended for replacement of existing

electromechanical relays with Numerical relays.

KPCL 1. e- Tender folated for the retrofit of existing static

relays with Numerical version for lines

M.nagar,M.bad,ICT-1 & 2 -Technical Bid opened

& price bid yet to be opened.

2. Retrofit of existing bus bar (CAG-34) with

numerical version -Budgetetory offers obtained and

is under process.

3. Order placed on M/s Siemens to replace relays.

The work will be Completed by May - 2015.

Pending

33/II/3 400kV

Hiriyur-BTPS line-2

22-05-14 &

23/05/2014

B phase to ground fault had

occurred in line and line auto

reclosed at Hiriyur end but failed to

reclose at BTPS end.

The PCSC forum requested KPCL to enable the A/R feature

at RTPS end before next PCSC meeting (i.e. 31st July, 2014.

KPCL 1. A/R for 220kV lines enabled already.

2. Shtu down of lines availed to commission the

auto reclosing schme fro 400 kV line at BTPS.

3. A/R shall be enabled in next shutdown

Pending

34/III/1 400kV

Raichur-BTPS line

26-06-2014 Transient fault in R-phase.

Line did not auto reclose

A/R at BTPS end to be made operational within one month KPCL 1. A/R for 220kV lines enabled already.

2. Shtu down of lines availed to commission the

auto reclosing schme fro 400 kV line at BTPS.

3. A/R shall be enabled in next shutdown

Pending

Pending Implementation of PCSC Recommendations (30th to 41st)

Andhra Pradesh

Telangana

Karnataka

Annexure-III

38/GD/3.5 GD-1 at Kadra and

Kodasalli hydro power

station

13-11-2014 at

19:31hrs

A fault had occurred in 220 kV

Kadra and

Kodasalli. As A result, de-

energization of

220kV bus occurred at Kadra and

Kodasalli.

1. The PCSC forum requested KPCL to speed up the

installation of Numerical Distance Protection relay in Kadra

–Kaiga and Kodasalli –Kaiga.

2. The PCSC forum requested KPCL to submit the

implementation status of PSAG-10 recommendations within a

week’s time.

KPCL All the recommendations of PSAG - 10 are

completed except the following pending issue:

i)e-NIT floated on 28.07.2014 for procurement of

Numerical distance relays & GPS. Bid evaluation

is under progress. The work will be completed by

December - 2015. Hower, as per the

recommendations of PSAG, Relays were

temporarily rearranged, replaced and wired up.

testing & commissioning shall be completed with

the assistance of KPTCL by March 1st week ,

2015.

Pending

34/I/6 400/220 kV ICT-1 & 2 at

MUNIRABAD

16-07-2014 As reported directional over current

relay of ICT’s operated due to

snapping of line jumper in 220kV

Lingapur line.

1. Bus bar protection shall be provided by asset owner ( i.e

KPTCL) .

2. Settings for main distance protection & Overcurrent

protection shall be examined and reviewed.

3. Time synchronization of the Substation shall be ensured.

4. Correct DR shall be submitted to the SRLDC for trip

analysis.

KPTCL Management approval is obtained for taking up the

work of providing bus bar protection to 220kV

buses at Guddadahally (Munirabad) Sub Station

along with replacement of 3 core/age old CTs of

220kV bays belong to KPTCL.

Under implementation

Mail recieved on 25-03-2015 (KPTCL):

1. KPTCL has taken action to provide bus bar

protection to 220kV buses.

2. Over current relay Settings of ICTs to be

reviewed by PGCIL.

Pending

38/GD/3.1 GD-1 at Mahalingapura

Substation of KPTCL

25-10-2014 Fault had occurred in 220kV

Mahalingapura-Narendra line-2.

Due to the

failure of relay operation at

Mahalingapura,

breakers at remote end tripped

which

resulted in bus dead condition.

1. PCSC forum recommended KPTCL to replace the old static

distance protection relays with numerical relays.

2. PCSC forum also requested KPTCL to provide a broken

conductor alarm indication in Control Room.

3. Standing instruction needed to be given to the all substation

personnel for not changing the relay settings without approval of

RT/MRT wing.

KPTCL Mail received on 25-03-2015 (KPTCL):

1.Existing Back up relays will be replaced by

numerical type distance relays.Procurement is in

tendering stage.

2. Alarm for Broken conductor is in service.

3. Clear instructions have been given to station

staff.

Pending

38/GD/3.2 GD-1 at Guttur

Substation of KPTCL

05-11-2014 at

11:42 hrs

Circuit breaker of 400kV Guttur-

Hiriyur

line-1 failed at Guttur end while

availing

shutdown for replacement of CVT.

The

failure of breaker caused bus fault at

Guttur.

KPTCL was requested to expedite the early implementation of

pending recommendations of:

1. Protection Audit (Phase-I & Phase-II)

2. PSAG-4, PSAG-5, and PSAG-8


Replacement of failed breaker of Hiriyur-1 line,

400kV BC and TBC is taken up at Guttur. Work is

entrusted to M/s Alstom.Complaince will be

furnished to SRPC upon completion of these

works.

Pending

39/I/5 Tripping of 400/220kV

ICT-2 at Hoody

substation of KPTCL

01-12-2014 Suspected mal-operation of 220kV

side Rphase

over current relay

1. PCSC forum recommended KPTCL to replace the relay

with a different make.

2. KPTCL was also requested to train the O&M personnel

adequately before performing any maintenance works to avoid

such unwanted trippings.


C&R panels of 500MVA ICT 1&2 will be replaced

under scheduled R&M works. O&M personnel are

instructed to take sufficient care in order to avoid

unwarrented trippings.

Pending

Annexure-III

40/I/1 GD-1 at 220kV

Ambewadi Station of

KPTCL

22-12-2014 at

21:22 hrs

Triggering incident was B-phase to

earth fault in 220kV Ambewadi-

Nagzari line-1. B-pole of breaker

did not open at Ambewadi end.

LBB protection not available at

Ambewadi end. All elements tripped

on Zone-2 from remote ends.

1. Till the completion of R&M works for bus bar and LBB

protection, KPTCL shall explore the possibility of having split

bus operation at Ambewadi and submit the details of the same

to PCSC forum.

2. KPTCL shall check up the ICTs protection system for

finding the cause of not tripping for the line fault (through fault)

and submit the remedial measures.

3. KPTCL shall provide the details of the tripping of Supa hydro

station connected downstream from 110 kV bus.

KPTCL Yet to be informed Pending

40/IV/1 220kV Sedam-

Tandur line

20-12-2014

at 22:20 hrs

Line tripped on Yphase to earth

fault from both the ends

KPTCL was requested to explore the possibility of providing

A/R feature to this line and submit the remedial measures to

the PCSC forum.


41/I/1 GD-1 at 220kV Kadra

power Station of KPCL

16-02-2015 at

12:56 hrs

Triggering incident was B-phase to

earth fault had occurred in 220kV

Kadra-Kodasalli line. Line tripped

from Kodasalli end only. 220kV

Kaiga-Kadra tripped in Zone-3 from

Kaiga end. Tripping of evacuating

lines caused bus shut down at Kadra

hydro station.

1. KPCL to make functional the Main2 (EPAC) relay with

the help of KPTCL at the earliest.

2. KPCL to investigate the reason for DC fuse fail during

transient fault in 220kV Kadra-Kodasalli line including the

testing/ checking of DC supply cables, breaker control cables,

and trip coils.

3. KPCL to ensure supply for Main-1& Main-2 protections,

Trip Coils (TC1, TC2) from separate battery banks.

KPCL Yet to be informed Pending

41/I/3 Complete outage of

Nagjheri Hydro power

station of KPCL (GD-1)

22-02-2015 at

11:09 hrs

During de-synchronization of Unit-

3, the Y-pole of the CB did not

open (was locked-out). This caused

LBB protection to operate resulting

in tripping of the Bus and all

connected 220kV lines and running

units at Nagjheri power station.

1. KPCL to investigate the cause of Y-pole breaker lock-out

of Unit-3, and take suitable remedial measures within a week’s

time

2. KPCL to furnish what caused LBB initiation and furnish

LBB Scheme details to PCSC forum

3. KPCL to furnish detailed tripping report (with DR & EL)

of the incident


41/I/4 Complete outage at

220kV Sedam Substation

of KPTCL (GD-1)

27-01-2015 at

8.00 hrs

R-Phase to ground fault occurred on

220kV Sedam-Shahpur line. Fault

not cleared from Sedam end due to

stuck-breaker condition. While the

Sedam- Sahapur line tripped from

Shahapur end in Zone-1, the other

220 kv lines from Sedam tripped at

remote ends in Zone-2. This caused

complete outage of 220kV Sedam

substation.

1. KPTCL to provide Bus bar and LBB protections for 220

kV bus at Sedam S/s.

2. KPTCL to implement A/R feature on 220 kV Sedam-

Tandur inter-state line.


41/II/11 Tripping of 400kV BTPS

- Hiriyur line-2

13-02-2015 at

17:07hrs

Line tripped at BTPS end only. furnish remedial measures taken to prevent

recurrence of PLCC mal-operation at BTPS.


Tamil Nadu

Annexure-III

36/II/9 400kV Arasur-Mettur

Line I

29-09-2014 Mettur S/s to Enable A/R Scheme. TANTRANSCO 1. During the 38th PCSC meeting, TANTRANSCO

informed that the Auto Reclosing facility would be

enabled within 15 days.

2 A/R scheme will be implemented after the

commissioning of 400 kV Thiruvalam Line-I & II.

Pending

37/II/3 400kV Mettur-Arasur

line-1

29-09-2014 Line tripped due to Y-Phase to earth

fault.

Line did not auto reclose as Auto

reclose scheme is kept in non-auto

mode.

A/R scheme to be enabled. TANTRANSCO 1. During the 38th PCSC meeting, TANTRANSCO



2. A/R scheme will be implemented after the


Pending


Mettur-Arasur line-2

22-10-2014 Line tripped on Rphase

to earth fault.

non-auto mode.

A/R feature to be enabled. TANTRANSCO 1. During the 38th PCSC meeting, TANTRANSCO



2. A/R scheme will be implemented after the


Pending

34/I/3 Tripping of HVDC

Bhadravati Pole-1 & 2

09-07-2014 As reported, pole-1&2 tripped due

to auxiliary supply failure.

1. The PCSC forum recommended PGCIL, SRTS-I take up the

issue with WRTS to submit the report as per IEGC guidelines.

2. SRLDC is also requested to write a letter to WRLDC to

submit the reports to SR also.

3. Based on the SRTS/SRLDC correspondences, SRPC would

take it up with WR and PGCIL if the issue is not getting

resolved.

4. Complete analysis of the faults and rectification/remedial

action taken to avert similar occurrence in the HVDC Back to

Back station shall be submitted.

PGCIL 1. Implementation of Tertiary Winding of ICT for

the auxilliary power supply is going to come up

which resolves this issue.

2. PGCIL informed that all issues would be

discussed during PSAG-11 visit.

Pending

34/I/7 HVDC

BHADRAVATHI

POLE 2

18-07-2014 As reported pole-2 tripped due on

5th harmonic alarm.

1. Complete analysis of the faults and rectification/remedial

action taken to avert similar occurrence in the HVDC Back to

Back station shall be submitted.

2. The PCSC forum recommended PGCIL, SRTS-I take up the

issue with WRTS to submit the report as per IEGC guidelines.

3. SRLDC is also requested to send a letter to WRLDC to

submit the reports to SR also.

4. Based on the SRTS/SRLDC correspondences, SRPC would

take it up with WR and PGCIL if the issue is not getting

resolved.

PGCIL Yet to be informed Pending

Kerala

PGCIL

Annexure-III

39/I/1 Tripping of 400kV

Gooty-Somanahalli

22-11-2014 Line tripped due to

suspected PLCC

Mal-operation at Gooty

end.

Retrofitting of the relay or installation of Optical Fiber cable is

recommended by PCSC forum to PGCIL.



Vijayawada-Gajuwaka

line

18-12-2014 at

18:33 hrs

Line tripped due to operation of

TEED protection at Gajuwaka end

due to opening of jumper of Y phase

CT.

PGCIL shall review the TEED protection at Gajuwaka end

and submit the details to PCSC forum.



Vijayawada-Nellore line 1

22-01-2015 at

11:39 hrs

line tripped on operation of TEED

protection at Vijayawada end and

direct trip was received at Nellore

end

review the TEED protection at Vijayawada

end with their OEM group and submit action taken report to

PCSC forum.



Coastal Energen (CEPL)--

-NTPL line

07-02-2015 at

01:07 hrs and at

00:08hrs on 08-

02-2015

B-phase to earth fault had occurred

in Line during both instants. As seen

from D.R of Coastal Energen

distance relay sensed fault in zone-2

and earth fault protection had

operated which resulted in tripping

of line.

to carry out hot-line washing regularly as NTPL is

in highly polluted location.


41/II/8 Tripping of HVDC

Talcher-Kolar pole-2

10-02-2015 at

7:37 hrs

Pole-2 tripped due to ESOF from

Talcher end

test the pumps at Talcher HVDC during pole

shut-down and submit the report to PCSC forum.


41/II/16 Tripping of 400 kV

NEYVELI TS 2 -

PUGALUR

15-02-2015 at

18:38 hrs

Line tripped at pugalur end due to

direct trip receive

PGCIL to check the protection coupler of PLCC system at

Pugalur end.


41/III/1 Tripping of 400kV Gooty-

Somanahalli line

20-01-2014 at

11:44 hrs

line tripped at Gooty end only and

was holding from Somanahalli end

line

• PGCIL to furnish remedial measures taken.

• PGCIL to properly tune PLCC panels.


41/III/2 Tripping of 400kV

Udumalpet-Palakad line-

1& 400 Udumalpet-

Arasur line-2

09-02-2015 at

9:50hrs

PLCC of Udumalpet-Arasur-2 mal-

operated

• PGCIL to furnish remedial measures taken.

• PGCIL to properly tune PLCC panels.


37/I/9 Tripping of 400/220kV

ICT-1&2 at UPCL

04-10-2014 ICT-1&2 tripped during transient

fault in R-phase in 400kV Hassan-

UPCL line-1

To avoid tripping of ICTs for line fault, UPCL is requested to

review the settings of ICT’s SEF relay and consider IDMT

setting instead of existing Definite Time setting.

UPCL It has been reported by UPCL that, the work of

review of relay coordination and setings for the

entire plant is given to M//s Alstom for entire

plant. UPCL has furnished the settings given by

M/s Alstom for verification. Revised settings will

be issued this week for implementation

Pending

40/II/8 Tripping of Unit-1 at

Kudankulam

14-01-2014 at

19:20 hrs

Y-phase Differential protection of

Generating transformer of Unit-1

got operated which resulted in

tripping of Unit-1.

1. NPCIL, Kudankulam was recommended to submit all the

relevant reports of the above incident.

2. PCSC forum also requested NPCIL, Kudankulam to upload

all the reports (DR/EL/ FIR) of any incident in the SRLDC web

portal within 24 hrs of its occurrence.

NPCIL, Kudankulam Yet to be informed Pending

41/II/10 Tripping of Hassan-

UPCL line-2

12-02-2015 at

15:57 hrs

Line tripped due to high resistance

fault in B-phase. DEF picked up at

hassan end and DT was sent to

UPCL. DEF protection did not pick

up at UPCL

revise their DEF relay settings. UPCL Yet to be informed Pending

Others

Annexure-III

41/II/12 Tripping of 400KV

Coastal-NTPL line

13-02-2015 at

22:54 hrs

Line tripped B-phase to earth fault

and later tripped on R-Y phase fault.

From Coastal end D.R, Y & B poles

of breaker opened first and R-pole

appears to be opened on Pole

discrepancy.

check A/R scheme at their end. CEPL Yet to be informed Pending

41/IV/2 400kV Tuticorin PS-

NTPL line

09-02-2015 at

03:17 hrs

Y-phase to earth fault had occurred

in line. Line auto reclosed at

Tuticorin PS end and failed to

reclose at NTPL end.

NTPL to check A/R scheme at their end. NTPL Yet to be informed Pending

36/II/8 400kV Raichur-

Munirabad line

07-09-2014 B-phase to earth fault had occurred

in line.

Line auto reclosed at Munirabad end

and failed to reclose at Raichur end.

KPTCL:

PD (pole discrepancy) time delay would be changed.

PGCIL /

KPTCL

Yet to be informed Pending

37/I/6 Tripping of 400KV

Hassan-UPCL line-2

25-09-2014 High resistance fault as the fault

ampere was very less i.e., 0.6kA at

Hassan end and nearly 0.9kA at

UPCL end.

Back up earth fault protection had

operated at Hassan.

At UPCL end the high resistance

fault got converted into a R ph-B-ph

fault which resulted in operation of

distance protection Zone-1.

The reason for non-picking up of

Back up earth fault at UPCL needs

investigation.

1. At UPCL end, unused zones of distance protection

(probably zone 5 to 8) shall be disabled.

2. At UPCL end, time synchronization between main-1 and

main-2 relays shall be ensured.

3. UPCL shall ensure time synchronization with Hassan

substation.

4. Reasons for non operation of back up protection at UPCL

for high resistance fault is to be submitted.

5. Reasons for not sending DT to UPCL by Hassan end is to

be submitted.

6. Settings of UPCL are to be reviewed and informed to

PCSC forum.

UPCL /

KPTCL

It has been reported by UPCL that, the work of

review of relay coordination and setings for the

entire plant is given to M//s Alstom for entire

plant. UPCL has furnished the settings given by

M/s Alstom for verification. Revised settings will

be issued this week for implementation.

Pending


Khammam- Kalpakka line

11-10-2014 Line tripped on Yphase

to earth fault.

reclose at Khammam

end.

APTRANSCO and TSTRANSCO were requested to clear the

corridor jointly at the earliest.

PGCIL/ APTRANSCO/

TSTRANSCO

Yet to be informed. Pending

38/II/5 400kV Ramagundam-

Hyderabad line-4

27-10-2014

to earth fault.

reclose at Hyderabad

end due to

PLCCmal-operation.

Planned to replace the PLCC system within a week's time at

both the ends during the shutdown.

NTPC/ PGCIL Yet to be informed. Pending

39/I/2 Tripping of

400Kv Ghanapur-

Mamidipally

line

22-12-14

at 10:52 hrs,

24-12-14 at 11:32

hrs,

24-12-14 at 16:16

hrs

Due to PLCC Mal-operation at

HYD S/S end, DT received at

MMPLY end and line got tripped.

PGCIL is requested check up with the manufacturer to

resolve the issue and submit remedial measures to PCSC forum.

PGCIL/ TSTRANSCO Yet to be informed. Pending

Miscellaneous

Annexure-III

40/II/3 Tripping of 400

kV TALAGUPPA

– HASSAN line

01-01-2015 at

13:38 hrs

On account of R-phase to earth

fault, line

tripped at Hassan end due to

operation of

distance Zone-2 and non-receipt of

carrier. From D.R of Talaguppa end

it is

observed that fault had occurred in

Yphase.

1. PGCIL and KPTCL to ascertain the reason for the phase

discrepancy in the relay operation and take suitable remedial

measures.

2. KPTCL to check the PLCC operation at Talaguppa end

and submit the report to the PCSC forum.

PGCIL/ KPTCL Yet to be informed Pending

41/I/2 Complete outage at

220kV Bahoor

Substation of Pondicherry

(GD-1)

15-02-2015 at

11:20 hrs

Bus fault occurred in 110kV bus at

230/110kV Bahoor substation due

to failure of Y-phase main bus strain

insulator. 220kV lines connected to

Bahoor (viz., Bahoor- NLC TPS II

and Bahoor – Pondy) tripped from

remote end on operation of back up

protection.

1. PED to investigate the cause of non-operation of ICT’s

protection system (differential protection, back-up

protection) and review the relay settings suitably.

2. PGCIL to check the settings of distance relay and back-

up relays for correctness of operation.

PED/PGCIL Yet to be informed Pending

41/II/3 Tripping of 400kV NLC-

1 EXP- IL&FS line and

400kV IL&FS - Trichy

line

24-01-2015 on

13:15 hrs

400kV NLC-1 EXP- IL&FS line

tripped on a R-phase to earth fault.

Line did not auto-reclose. 400kV

IL&FS - Trichy line tripped at

Trichy due to Direct trip receive

from IF&FS.

action

taken report on the recommendations given by SRPC

Committee in their meeting held at IL&FS on 19-02-2015 to

SRPC.

IL&FS / PGCIL (SR-II)/ NLC-1

Exp


41/II/5 Tripping od 400 kV NLC

EXP- ILFS line

05-02-2015 at

06:05 hrs

Line tripped due to direct trip

receipt from IL&FS

action

taken report on the recommendations given by SRPC

Committee in their meeting held at IL&FS on 19-02-2015 to

SRPC.

IL&FS / PGCIL (SR-II)/ NLC-1

Exp


Tripping of 400kV NTPL-

Tuticorin pooling station

13-02-2015 at

23:12 hrs


fault at 22:53 hrs. Line auto

reclosed at Tuticorin pooling end

and holding. At 23:12 line tripped

on B-phase to earth fault in zone-2

time.



14-02-2014 at

1:41 hrs

B-phase to earth fault had occurred

and line auto reclosed at 01.09 Hrs

and holding from Tuticorin PS end

and line was and up hand tripping at

01.44.



14-02-2014 at

6:55 hrs

Line tripped on B-phase to earth

fault. Line did not reclose at NTPL

end

41/II/13,

41/II/14,

41/II/15

PGCIL to carry out hot-line washing regularly as NTPL is

in highly polluted location.

NTPL to review A/R scheme at their end.

PGCIL/NTPL Yet to be informed Pending

Annexure-III

S.No. Element Name Outage

date/time

Revival

date/time

Reason for Outage Sender/ Receiver Remedial Measures/ Actions taken

1 400/220 Kv ICT-1 AT SATTENAPLLI 26-02-2015/

10:19:00

26-02-2015/

11:30:00

GROUP - A PROTECTION OPERATED TSTRANSCO To-be-discussed

2 400 Kv SATTENAPALLI - SRISAILAM 2 04-03-2015/

14:25:00

04-03-2015/

15:08:00

R-N FAULT TSTRANSCO/ TSGENCO To-be-discussed

3 220 kV CHITTOR - THIRUVALEM 19-03-2015/

15:18:00

19-03-2015/

15:46:00

TRIPPED ON R-PH FAULT APTRANSCO/ TNEB TANTRANSCO: Temporary line fault.

APTRANSCO:

4 220 kV AMBEWADI - PONDA 1 19-03-2015/

18:55:00

REASON TO BE STATED LATER KPTCL To-be-discussed

5 400 kV GOOTY - NELAMANGALA 19-03-2015/

14:24:00

19-03-2015/

14:44:00

TRIPPED B-PH FAULT PGCIL (SR-I)/ KPTCL To-be-discussed


12:40:00

DISTANCE PROTECTION RELAY ACTED KPTCL To-be-discussed

7 400 kV TALAGUPPA - NEELAMANGALA 20-03-2015/

13:37:00

20-03-2015/

14:07:00

DISTANCE PROTECTION ACTED (REASON

AWAITED)

KPTCL To-be-discussed

8 220 kV SABARGIRI - THENI 20-03-2015/

13:08:00

20-03-2015/

13:46:00

TRIPPED ON R-Y-PH FAULT KSEB/ TNEB TNEB: Temporary line fault. AR operated & subsequently

lockout at Theni end. KSEB:

9 400 Kv KRISHNAPATNAM - NELLORE 20-03-2015/

03:02:00

DISTANCE PROTECTION APGENCO/ APTRANSCO To-be-discussed

10 400 Kv KRISHNAPATNAM - CHITTOOR 20-03-2015/

05:05:00

20-03-2015/

05:29:00

DT RECEIVED AT KRSNPTNM APGENCO/ APTRANSCO To-be-discussed

11 400 kV KHAMMAM - MAMIDIPALLY 1 21-03-2015/

13:09:00

21-03-2015/

13:56:00

B -N FAULT PGCIL (SR-I)/ TSTRANSCO PGCIL (SR-I):The feeder Auto reclosed and tripped on B-N

persistent fault in line.

TSTRANSCO:

12 400 kV KAIGA - GUTTUR 1 21-03-2015/

17:44:00

21-03-2015/

18:44:00

DT RECEIVED AT KGA END KAPS/ KPTCL To-be-discussed

13 400 kV KAIGA - GUTTUR 2 21-03-2015/

20:03:00

21-03-2015/

20:30:00


14 400 kV KAIGA - GUTTUR 2 21-03-2015/

17:44:00

21-03-2015/

18:58:00


15 400 kV KHAMMAM - KALPAKKA 1 22-03-2015/

14:05:00

22-03-2015/

20:55:00

B-N FAULT PGCIL (SR-I)/ APTRANSCO PGCIL (SR-I): The feeder Auto reclosed and tripped on B-N

persistent fault in line

APTRANSCO:


12:53:00

22-03-2015/

13:28:00

R - N FAULT PGCIL (SR-I)/ APTRANSCO PGCIL (SR-I): The feeder Auto reclosed and tripped on B-N


APTRANSCO:


14:45:00

22-03-2015/

20:57:00



APTRANSCO:


12:01:00

22-03-2015/

20:21:00

B - N FAULT PGCIL (SR-I)/ TSTRANSCO PGCIL (SR-I): The feeder Auto reclosed and tripped on B-N


TSTRANSCO:


13:36:00

22-03-2015/

13:58:00



APTRANSCO:

Pending Remedial Measures/ Actions taken

for the Critical Tripping Incidents (as on 16.04.2015)

Annexure-IV


18:32:00

25-03-2015/

19:15:00

B-N FAULT PGCIL (SR-I)/ TSTRANSCO PGCIL (SR-I): The feeder Auto reclosed and tripped on B-N


TSTRANSCO:


16:15:00

DISTANCE PROTECTION KPTCL To-be-discussed

22 400 kV KAIGA - GUTTUR 1 27-03-2015/ 13:40:00 27-03-2015/ 15:26:00 TRIPPED WHILE CHECKING RELAY KGS/KPTCL To-be-discussed

23 400 Kv RAICHUR PG - GOOTY 1 28-03-2015/ 19:34:00 28-03-2015/ 19:52:00 TRIPPED DURING RELAY TESTING AT RAICHUR PGCIL (SR-I) To-be-discussed

24 220 kV AMBEWADI - PONDA 1 28-03-2015/ 11:01:00 28-03-2015/ 11:24:00 TRIPPED ON B-N FAULT KPTCL To-be-discussed

25 400/220 kV ICT-2 AT MAHABOOB

NAGAR

28-03-2015/ 06:40:00 RESTRICTED EARTH FAULT TSTRANSCO To-be-discussed

26 400 Kv ALM - SVCTM-II 29-03-2015/ 15:29:00 29-03-2015/ 16:51:00 B -N FAULT TNEB R-N fault at the time of 400 kV Alamathy - Sunguvarchatram - I

Feeder tripping. (Both the feeders in the same tower).

27 400/230 Kv ICT-1 AT

SUNGUVARCHATRAM

29-03-2015/ 15:29:00 29-03-2015/ 16:32:00 OVER FLUX PROTECTION OPERATED TNEB It is 400/110kV ICT-3 at Sunguvarchatram. On 29.03.2015 @

15.29.38Hrs., 400/110KV, 3×66.67MVA, ICT-3 tripped on V/f

trip due to sudden rise in voltage (around Va=321 &

Vc=333KV) and actuation of V/f Trip of ICT-3 occurs few

milliseconds after the fault tripping of 400KV Alamathy-1

Feeder and 400KV Alamathy-2 feeder. ICT-3 was put back into

service at 16:30:18 Hrs

28 400 Kv ALM - SVCTM-I 29-03-2015/ 15:29:00 PHASE TO PHASE FAULT TNEB Line Fault due to jumper cut in B phase. Feeder normalised on

30.03.2015 @ 12:10 hrs. after attending the fault.

29 220 kV AMBEWADI - PONDA 1 30-03-2015/ 13:10:00 30-03-2015/ 20:40:00 B - N FAULT KPTCL To-be-discussed

30 400 Kv VTPS - MALKARAM 2 30-03-2015/ 11:51:00 30-03-2015/ 20:41:00 R -N FAULT APGENCO/ TSTRANSCO To-be-discussed

31 400/220 kV ICT-1 AT BTPS 31-03-2015/ 05:06:00 REASON AWAITED KPCL To-be-discussed

32 400 kV KURNOOL - SRISAILAM 01-04-2015/ 15:01:00 01-04-2015/ 15:30:00 B-N FAULT APTRANSCO/ TSGENCO To-be-discussed

33 400 kV HYDERABAD - KURNOOL 01-04-2015/ 13:01:00 01-04-2015/ 13:45:00 TRIPPED PGCIL(SR-I)/ APTRANSCO To-be-discussed

34 400 kV HYDERABAD - KURNOOL 01-04-2015/ 15:01:00 01-04-2015/ 17:34:00 TRIPPED PGCIL(SR-I)/ APTRANSCO To-be-discussed

35 400 kV KURNOOL - SRISAILAM 01-04-2015/ 13:01:00 01-04-2015/ 13:46:00 B-N FAULT APTRANSCO/ TSGENCO To-be-discussed

36 220 kV IDUKKI - UDUMALPET 03-04-2015/ 16:39:00 03-04-2015/ 17:25:00 TRIPPED ON B-PH FAULT KSEB/ TNEB TNEB: Temporary fault due to heavy rain at Edukki area. AR

operated & Lockout at Udumalpet end.

KSEB:

37 400 Kv NCTPS - VALLUR 2 03-04-2015/ 22:10:00 DIFFERENTIAL PROTECTION OPERATED TNEB/ NTECL TNEB: No visible fault. AR operated & holding at Vallur end.

NTECL:

38 400 kV DICHIPALLY - RAMAGUNDAM 05-04-2015/ 13:43:00 05-04-2015/ 22:23:00 R - N FAULT TSTRANSCO/ NTPC NTPC: The line tripped on R-N fault at 13:43 Hrs on 5/4/2015.

An attempt was made to charge from Dichipally end at 15:40 hrs.

But it tripped on SOTF. APTRANSCO have informed that they

rectified the fault. Subsequently, it was charged from

DICHIPALLY end, but it has tripped on over voltage at

ramagundam end. Finally the line was charged from RDM end at

22:30 hrs and subsequently synchronized at dichipally end.

APTRANSCO:

39 400 kV GUTTUR - NARENDRA 2 06-04-2015/ 17:07:00 06-04-2015/ 17:23:00 H/T BY MISTAKE BY NARENDRA OPERATOR

KPTCL/ PGCIL (SR-II)

To-be-discussed

40 220 kV SEDAM - TANDUR 06-04-2015/ 13:53:00 06-04-2015/ 16:25:00 OCR OPERATED KPTCL/ TSTRANSCO To-be-discussed

41 400 Kv NCTPS - VALLUR 2 07-04-2015/ 02:41:00 DIFFERENTIAL PROTECTION OPERATED TNEB/NTECL To-be-discussed

42 400 Kv NCTPS - VALLUR 2 07-04-2015/ 23:13:00 TRIPPED ON Y-PH FAULT TNEB/NTECL To-be-discussed

43 400 Kv NCTPS - VALLUR 1 08-04-2015/ 22:28:00 TRIPPED ON R-PH FAULT TNEB/NTECL To-be-discussed

44 HVDC TALCHER - KOLAR POLE 09-04-2015/ 12:04:00 09-04-2015/ 14:18:00 CONVERTER TRANSFORMER R PHASE OLTC

PRD OPERATED PGCIL (SR-II)

To-be-discussed

45 765 KV RAICHUR - KURNOOL 10-04-2015/ 18:45:00 10-04-2015/ 21:16:00 Y-B FAULT PGCIL (SR-I) To-be-discussed

46 400 Kv KAYATHAR - KARAIKUDI 1 11-04-2015/ 09:58:00 SF6 LEAKAGE IN REACTOR BREAKER TNEB To-be-discussed

47 400 kV TALAGUPPA - NEELAMANGALA 11-04-2015/ 02:22:00 11-04-2015/ 02:49:00 Y-N FAULT

KPTCL

To-be-discussed

Annexure-IV

48 400 kV MAHABOOB NAGAR - RAICHUR 11-04-2015/ 18:07:00 11-04-2015/ 18:50:00 TRIPPED ON R-PH FAULT

TSTRANSCO /KPCL

To-be-discussed

49 400 Kv NCTPS - VALLUR 1 11-04-2015/ 04:29:00 DIFFER PROTECYION IN R-EARTH DUE TO FOG

& 220 KV LINE TRIPPING DUE TO FOG

TNEB/NTECL

To-be-discussed

50 765 KV RAICHUR - KURNOOL 11-04-2015/ 18:04:00 11-04-2015/ 18:55:00 TRIPPED ON Y-B FAULT PGCIL (SR-I) To-be-discussed

51 220 Kv REGULAPADU- ALIPUR LINE 11-04-2015/ 18:13:00 11-04-2015/ 19:20:00 EFR RELAY ACTED

APTRANSCO/ KPTCL

To-be-discussed

52 220 kV SEDAM - TANDUR 11-04-2015/ 18:12:00 11-04-2015/ 19:36:00 EFR RELAY ACTED KPTCL/ TSTRANSCO To-be-discussed

53 400 kV RAICHUR - BTPS 11-04-2015/ 17:42:00 11-04-2015/ 19:02:00 TRIPPED ON B-PH FAULT KPCL To-be-discussed

54 400/110 kV ICT 2 AT ALAMATHY 11-04-2015/ 11:30:00 11-04-2015/ 17:31:00 SF6 GAS LEAKAGE TNEB To-be-discussed

55 400 Kv RAICHUR PG - GOOTY 2 11-04-2015/ 18:04:00 TRIPPED AT RCR END DUE TO LA FAILURE

PGCIL (SR-I)

To-be-discussed

56 400 Kv NCTPS - VALLUR 1 12-04-2015/ 03:47:00 DISTANCE PROTECTION TNEB/NTECL To-be-discussed

57 220 kV IDUKKI - UDUMALPET 12-04-2015/ 01:43:00 12-04-2015/ 02:18:00 B PHASE DISTANCE PROTECTION KSEB/ TNEB To-be-discussed

58 220 kV IDUKKI - UDUMALPET 12-04-2015/ 15:12:00 12-04-2015/ 16:26:00 B-N FAULT KSEB/ TNEB To-be-discussed

59 400 Kv NELLORE - SPDR 12-04-2015/ 20:37:00 12-04-2015/ 21:11:00 R-N FAULT

PGCIL (SR-I)/ PGCIL (SR-II)

To-be-discussed

60 400 Kv HASSAN - UPCL 1 12-04-2015/ 12:58:00 12-04-2015/ 13:23:00 TRIPPED ON B-PH FAULT PGCIL (SR-II) /KPTCL To-be-discussed

61 220 kV GUMMUDIPUNDI - SULLURPET 13-04-2015/ 17:15:00 13-04-2015/ 17:37:00 DISTANCE PROTECTION

TNEB/ APTRANSCO

To-be-discussed

62 400 kV ALAMATHI - VALLUR 1 13-04-2015/ 19:43:00 DISTANCE PROTECTION

TNEB/NTECL

To-be-discussed

63 400 Kv HASSAN - UPCL 1 14-04-2015/ 11:08:00 14-04-2015/ 11:39:00 TRIPPED ON B-PH FAULT PGCIL (SR-II) /KPTCL To-be-discussed

64 400 kV GHANAPUR - MAMIDIPALLY 14-04-2015/ 03:42:00 TRIPPED AT MDPL END ONLYPGCIL (SR-I) /TSTRANSCO

To-be-discussed

65 400/220 kV ICT-1 AT BTPS 14-04-2015/ 01:09:00 MAIN PROTECTION OPERATED

KPCL

To-be-discussed

66 220 kV YERANDAHALLY - HOSUR 14-04-2015/ 19:12:00 14-04-2015/ 19:37:00 B - N FAULT KPTCL/TNEB To-be-discussed

Annexure-IV

Documents

SOUTHERN REGIONAL POWER COMMITTEE - · PDF fileSOUTHERN REGIONAL POWER COMMITTEE ... Single line diagram of the station with switching devices, ... 765/400kV ICT-1 at Thiruvelam