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पता सूचि / Address List

1. मुख ्य अमभयंता ( एिपीसी ि जऱ पररयोजना) एपीजेनको, हैदराबाद / Chief Engineer (Generation I),

APGENCO, Hyderabad

2. मुख‍्य अमभयंता (पररयोजना), एपीजेनको, हैदराबाद/ Chief Engineer (Projects), APGENCO, Hyderabad

3. मुख‍्य अमभयंता ( विद्युत प्रणाऱी), एपीट्रान‍्स‍्को, हैदराबाद/ Chief Engineer (Power System),

APTRANSCO, Hyderabad.

4. मुख‍्य अमभयंता ( उत‍्पादन), टीएसजेनको, हैदराबाद/ Chief Engineer (Generation), TSGENCO,

Hyderabad

5. मुख‍्य अमभयंता (पररयोजना), टीएसजेनको, हैदराबाद/ Chief Engineer (Projects), TSGENCO, Hyderabad

6. मुख‍्य अमभयंता ( विद्युत प्रणाऱी), टीएसट्रान‍्स‍्को, हैदराबाद/ Chief Engineer (Power System),

TSTRANSCO, Hyderabad

7. मुख‍्य अमभयंता (इऱे.डडजाईन), केपीसीएऱ, बेंगऱूर/ Chief Engineer (Ele. Designs), KPCL, Bangalore

8. मुख‍्य अमभयंता ( आर टी), केपीटीसीएऱ, बेंगऱूर/ Chief Engineer (RT), KPTCL, Bangalore

9. मुख‍्य अमभयंता, एसएऱडीसी, केपीटीसीएऱ, बेंगऱूर/ Chief Engineer, SLDC, KPTCL, Bangalore

10. मुख‍्य अमभयंता ( एनसीटीपीएस-।।), टैनजोडको, िैन‍्नै/ Chief Engineer (NCTPS-

II),TANGEDCO,Chennai

11. मुख‍्य अमभयंता (संरऺण एिं संिार), टी एन ई बी, िने‍्नै/ Chief Engineer (Protection & Communication),

TANTRANSCO, Chennai

12. मुख‍्य अमभयंता (पारेषण), प्रणाऱी प्रिाऱन, एिएमटी काऱोनी, केएसईबी, कऱमस‍्सेरी-683503/ Chief Engineer

(Transmission) System Operation, HMT Colony, KSEB, Kalamassery-683503

13. मुख‍्य अमभयंता (पारेषण) एनपीसीआईएऱ, मुंबई/ Chief Engineer (Transmission), NPCIL, Mumbai.

14. अपर तनदेशक (पररयोजना), पीसीकेएऱ, बेंगऱूर-9/ Additional Director (Projects), PCKL,Bangalore-9

15. महाप्रबंिक ( ओ एस), एनटीपीसी, दक्षऺण ऺेत्रीय मुख‍्याऱय, मसकंदराबाद/ General Manager (OS), NTPC

SRHQ, Secunderabad

16. अिीऺण अमभयंता (विद्युत), केपीसीएऱ, बेंगऱूर/ Superintending Engineer (El.), KPCL, Bangalore

17. अिीऺण अमभयंता ( विद्युत), मुख‍्य अमभयंता ( आरटी) का कायासऱय, केपीटीसीएऱ, बेंगऱूर/ Superintending

Engineer (El.), KPTCL, O/o Chief Engineer (RT), KPTCL, Bangalore

18. जी एम ( प्रिा ि अनु) दऺ-े।, पािरधिड, मसकंदराबाद/ GM (O&M), SR-I, PGCIL, Secunderabad

19. जी एम ( प्रिा ि अनु) दऺ-े।।, पािरधिड, बेंगऱूर/ GM (O&M), SR-II, PGCIL, Bangalore

20. श्री पी पी जेस‍्टीन, एजीएम ( ईएम), एनटीईसीएऱ, िने‍्नै-103/ Shri P.P.Gestine, AGM (EM), NTECL,

Chennai-103.

21. श्री ई सिींद्र कुमार, सी. एम. (विद्यतु ), टीपीएस-। विस‍्तार, एनएऱसी, नैिेऱी- 607807/ E. Sachindra Kumar,

CM (Electrical), TPS-I Expn. NLC, Neyveli-607807 (Fax No: 04142 – 257944)

22. कें द्र तनदेशक, केजीएस 3 ि 4, कैगा, कनासटक/ Station Director, KGS 3&4, Kaiga, Karnataka

23. अनुरऺण अिीऺक, केजीएस 1 ि 2 , कैगा कनासटक/ Maintenance Superintendent, KGS 1&2, Kaiga,

Karnataka.

24. अनुरऺण अिीऺक, एमएपीएस, कऱ‍्पक्‍कम/ Maintenance Superintendent, MAPS, Kalpakkam

25. अनुरऺण अिीऺक, केकेएनपी, ततरुनऱ‍्िेऱी न्जऱा, तममऱनाडु- 627106/ Maintenance Superintendent,

KKNP, Thirunelveli Dist,TN-627106

26. कायसकारी अमभयंता (पी ि एमडी), मुख‍्य अमभयंता (जी) का कायासऱय, मूऱमट्टम, केएसईबी, इडुक्‍की न्जऱ‍्ऱा/ EE

(P&MD), O/o CE (G), Moolamattom, KSEB, Idukki (dist) - 685589

27. कायसकारी अमभयंता/ प्रभागीय ईएििी, विद्युत विभाग, पुदिुरेी/ EE/ Div EHV, Electricity Department,

Puducherry

28. श्री सतीष न्जंदऱ, सीईओ, जेएसडब‍्ऱ‍्यू एनजी मऱ. नई ददऱ‍्ऱी–‍110066/‍Shri Satish Jindal, CEO, M/s JSW

Energy Ltd, New Delhi-110066

29. श्री िीरेश देिरमनी, उ म प्र, जेएसडऱ‍्ब‍्यू एनजी मऱ. तोरणगऱ‍्ऱू. बेऱ‍्ऱारी- 583275/ Shri Veeresh Devaramani,

DGM, M/s JSW Energy Ltd, Toranagallu, Bellary-583275

30. श्री आर िी भट्टए, उपाि‍्यऺ ( प्रिाऱन) यूपीसीएऱ, बेंगऱूर/ Shri R.V.Bhat, Vice President (Operations),

UPCL, Bangalore

31. सह उपाध्यrऺ ( संरऺण ि मीटररगं) , अदानी पािर मऱ , 8-ए , 'संभि' जज भिन के सामने , बोदकदेि , अहमदाबाद- 380015 , गुजरात / Associate Vice President (Protection & Metering), Adani Power

Ltd, 8-A, ‘Sambhav,’ Opp. Judge’s Bungalow, Bodakdev, Ahmedabad 380 015, Gujarat, India

*****

SOUTHERN REGIONAL POWER COMMITTEE

BENGALURU

Agenda for the 48

th Meeting of Protection Coordination Sub-Committee of

SRPC to be held on 29.10.2015 (Thursday)

1. Introduction

2. Confirmation of Minutes of last PCSC meeting

Confirmation of minutes of 47th

Protection Coordination Sub-Committee meeting

held on 15.09.2015.

3. Grid Occurrences

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 (August - October, 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) Cause of the tripping & Remedial Action taken

(c) Relay setting details

(d) Deficiencies / Observations as perceived by the Utility which needs PCSC’s

intervention.

Constituents are requested to bring/ give full particulars for the tripping events

incident to their system.

3.2 In compliance of Regulations 5.2 (r) of IEGC, the Constituents are requested to furnish the following information in respect of Grid Occurrences (Annexure-II)

latest by 20.10.2015:

(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. Submission of reports/compliance by Constituents

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

Recommendations

Status of the pending PCSC recommendations (from 30th

PCSC to 47th

PCSC) given at Annexure-III may please be sent latest by 26.10.2015.

Agenda for the 48th Protection Coordination Sub Committee Meeting to be held on 29-10-2015 Page 2

4.2 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")

4.3 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 September, 2015 is still awaited from the

following SR-Constituents:

APTRANSCO, TSGENCO (Thermal & Hydro), KPTCL, TANGEDCO,

KSEB, PED, PGCIL (SR-II), NTPC (Ramagundam), NTPL, SEL, CEPL,

MEPL & TPCIL.

5. SPS for contingency of 400 Nellore-NPS lines

It is to bring to your kind notice that continuous high flows in the order of 600 MW to

900 MW are being observed in each of the 400kV Nellore-NPS D/C lines. The issue of

over loading of these lines was also discussed in PCSC-47 held on 15.09.2015, when it

was opined to put in place an SPS to deal with system security issues that may arise on

account of tripping of one of the lines. The ‘N-1’ thermal limit of these lines (quad

Moose) is assumed as 1700 MW. However, in the event of tripping of one of 400kV

Nellore (PG) - NPS D/C lines, ‘N-1’ security of the system will be breached as the flow

on the second line crosses the thermal limit.

Presently, generation from TPCIL, MEPL and SEPL (2000 MW approx.) is being

evacuated through these lines and the situation would only get aggravated in the absence

of generation at Krishnapatnam TPS (SDSTPS). Further, generation (amounting to 600

MW) from NCC TPS, which is expected to be commissioned in March, 2016, would also

have to be evacuated through these lines.

Considering above factors and in the interest of operational security of the grid to make

it ‘N-1’ secure, it is proposed to provide an SPS for contingency of one of 400kV NPS -

Nellore (PG) D/C lines. The SPS, which necessitates backing down/ generation tripping

of 650 to 750 MW at SEPL, MEPL and TPCIL power stations, would be presented along

with study results by SRLDC for discussion and approval.

http://srldc.in/DailyReport.aspx


6. Provision of line differential protection for 400 kV Nellore-NPS D/C lines

The 400 kV Nellore (PG) - NPS lines being of short length, need for provision of line

differential protection (Main-1& Main-2) for the same has been emphasized and

discussed in several PCSC meeting of SRPC. There have been few cases in the recent past

also where distance relay at NPS/ Nellore (PG) over-reached and tripped for remote end

faults.

1. 400kV NPS-Nellore lines tripped on zone-2 from NPS end during tripping at

Krishnaptnam TPS at 18:20 hrs on 8.09.2015.

2. Line tripped at NPS end only and was holding from Nellore during CT failure at

MEPL station at 20:38 hrs on 20-05-2015

Considering their importance in grid, it is necessary to avoid unwarranted tripping of

these lines. As such, the line differential protection for these lines is envisaged to avoid

mal-operation of protection system.

7. Review of implementation of certain Protection Audit Recommendations of SR-

Constituents

Based on the status updates received from APGENCO, TANGEDCO, TANTRANSCO

w.r.t. implementation of protection audit recommendations of their stations, certain recommendations, as brought out in Annexure-V, are proposed to be reviewed for

implementation.

8. Network Configuration changes

As per the information furnished by SR-Constituents to the OCC forum in their 110th

meeting held on 06.08.2015 (Minutes circulated on 27.08.2015) and 111th meeting held

on 08.09.2015 (Minutes circulated on 28.09.2015), the following network configuration

changes (additions/ deletions/ modifications of transmission elements) took place in the

southern grid during the months of July-September, 2015.

The following assets under “ Transmission System associated with System

Strengthening –XVIII in SR grid “ along with Communication Signal from sending end

to receiving end, metering, telemetry and protection system had been put under COD

8th August 2015 (charged on 4th August 2015) :

400 kV Vijayawada (Nunna PG) - Nellore (APTRANSCO) Ckt-III along with

1 x 63MVAR line reactor.

400 kV Vijayawada (VTPS)-Nellore (APTRANSCO) along with 1 x 63

MVAR line reactor.

9.6 MW Wind Generation capacity was added in Tamil Nadu during the month of

July 2015.

COD of LANCO St-3 Unit 3A was declared on 11-08-2015.

COD of Unit II (800 MW) of SDSTPP (Krishnapatnam JV) of APGENCO was

declared on 24-08-2015 from 00:00 hrs.

Unit I (600 MW) of IL &FS was synchronized to grid on 05.08.2015.

Unit II (500 MW) of NTPL was declared COD on 29-08-2015 from 00:00 hrs.

Subsequently Unit II (660 MW) of TPCIL was declared COD w.e.f. 00:00 hrs of 15-

09-2015.

0.75 MW Wind Generation Capacity was added in Tamil Nadu during the month of

August, 2015.


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.

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.

9.4 APTRANSCO’s Petition No.95/MP/2015: Date of hearing 09-04-2015

It was noted in the Analysis and Decision part of the Order that:

“8. Noting the submissions of the petitioner, SRPC and SRLDC and activities

initiated by the petitioner for procurement of materials required for

implementation of the remarks of protecting audit, we allow time to the

petitioner till 31.12.2015 for completion of our directions in Order dated

19.12.2013 in Petition No. 146/MP/2013.”

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


“9. SRPC is directed to monitor the status of completion of works relating to

protection audit remarks in respect of 7 nos 400 kV sub-stations and 11 nos

220 kV sub-stations of APTRANSCO, protection audit remarks in Protection

Coordination Sub-Committee (PCSC) meetings and coordinate the periodic

protection audit to be carried out in Southern Region after deliberation in

SRPC and submit bi-monthly report to the Commission.”

9.5 TSTRANSCO’s Petition No.83/MP/2015: Order dated 14-05-2015

It was noted in the Order that:

“12. Noting the submission of the petitioner, SRLDC and SRPC and

considering the actions already initiated by the petitioner for implementation

of works relating to protection audit, we allow time till 31.10.2015 and

31.8.2016 for implementation of Phase-I and Phase -II works respectively.

The petitioner is directed to submit affidavit confirming the completion of

Phase I of protection audit remarks by 31.10.2015 and Phase-II of protection

audit remarks by 31.8.2016.

13. SRPC is directed to monitor the status of completion of remarks in these

substations vis-à-vis protection audit remarks in Protection Coordination Sub

Committee (PCSC) meetings. SRPC is further directed to coordinate the

periodic protection audit to be carried out in Southern Region after

deliberation in SRPC.”

9.6 Order in Petition No. 86/MP/2014 and 374/MP/2014: Order dated 18-08-2015

The time-lines given to the various SR-Constituents for completion of Phase-I and

Phase-II activities of Protection Audit Recommendations are given below:

(A) KSEBL:

18. Noting the submission of KSEBL, SRLDC and SRPC and considering the actions

already initiated by KSEBL for implementation of remarks of protection audit, we

allow time till 31.12.2015 and 31.3.2016 for implementation of Phase-II works

and R&M works at Idduki HEP respectively.

(B) TANTRANSCO: 21. After considering the submissions of TANTRANSCO, SRLDC and SRPC, it is noted

that TANTRANSCO`s request for time till 31.5.2015 for implementation of Phase–I

activities of providing numerical relays for feeder protection and Auto transformer

protection is already over. We allow time till 30.6.2016 for other Phase-I activities

such as provision of line VT, 5 core CT, Time synchronizing with GPS, Disturbance

recorder & event logger and Phase-II activities. According to SRLDC, total

implementation period is 15 to 16 months for items which involve major

procurement, design changes with major site modification/civil activities.

Accordingly, we allow 16 months time i.e up to 30.11.2016, for Renovation and

Modernization of Singarpet, Singaperumalkoil, Salem and Tondiarpet 230 kV sub-

stations from the issue of the order.

(C) NLC:

22. NLC has sought time upto 31.12.2014 and 31.3.2015 for completion of Phase-I work

of Numerical Relay Retrofitting and for Phase-II works of providing second battery

bank of PLCC respectively. It is noted that the completion dates for Phase-I and

Phase-II of protection audit remarks as requested by NLC are already over.


Therefore, no direction is required in this regard. However, we direct NLC to file a

confirmation report regarding completion of protection audit works for Phase-I and

Phase-II.

(D) KPTCL:

23. …

…

Considering the submission of KPTCL and SRLDC, we allow time to KPTCL time till

15.01.2016 for completion of Phase-I and Phase-II of protection audit remarks. No

further extension shall be granted in this regard.

(E) KPCL:

24. …

… Considering the submission of KPCL and SRLDC, we allow time to KPCL till

31.10.2015 and 31.12.2015 for completion of Phase-I for Phase-II of protection

audit remarks respectively. No further extension shall be granted in this regard.

26. We direct SRPC to (a) submit status of protection audit remarks in respect of

APGENCO, NTPC (SR), Talcher, Puducherry, PGCIL (SRTS I & II), MAPS and

TANGEDCO, (b) monitor the status of completion of remarks of protection audit in

respect of all constituents of Southern Region in Protection Coordination Sub-

Committee (PCSC) meetings, and (c) to coordinate periodic protection audit to be

carried out in Southern Region after deliberation in SRPC. All the constituents of

Southern Region are directed to file their status with SRPC on regular basis to

facilitate proper monitoring in PCSC meetings. SRPC is directed to submit bi-

annually status report to the Commission confirming the completion of Phase-I,

Phase-II and R&M works of protection audit remarks of the constituents of Southern

Region.

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 49th

PCSC meeting would be conducted on 30.11.2015 (Monday) at UPCL,

Mangalore, Karnataka.

*******

Anusha

Highlight

Grid Occurrences

For all tripping events involving failure of substation equipment, Constituents are

requested to kindly furnish the SLD or equivalent pictorial representation showing

(i) Location of the fault, and (ii) Bus-bar arrangement/ Configuration of feeders and

other connected equipment with proper CB positions (OPEN/ CLOSE) at the time of

occurrence of the fault.

1. ग्रिडडडस्टर्बन्स / ग्रिडइन्सडन्टकावििरण - Details of Grid Disturbances:

Sr. No.

क्र.सं. घटनाकावििरण /

Details of Event

तारीख/ Date &

समय /Time कारण / Reason

टटप्पणी /Remarks

शे्रणी/ Category

1

Disturbance in

220kV Tamilnadu

system

05-09-2015

at 14:04 hrs

Complete outage of 230kV

Palladam, Othakalmandapam

S/s, Coimbatore S/s, Thudialur

and Sadayapalayam S/s

GD-1

2

Complete outage of

220kV Peenya

Substation in

Karnataka

27-09-2015

at 4:23:17

hrs

all connected 220kV lines and

transformers were taken on

220kV North bus as South bus

was under shut down for

conversion of strung bus to rigid

bus and isolator replacement

under R&M works. Failure of

HV side Y phase CT of

150MVA Transformer-3

occurred at Peenya Substation

which resulted in operation of

Differential and HV REF

protection. The failure of CT

also resulted in a 220kV bus

fault in North Bus

GD-1

3

Outage of 220kV

Ambewadi station

in Karnataka

30-09-2015

at 10:41 hrs

220kV Ambewadi-Nagjheri line-

2 tripped on B-phase to earth

fault. This resulted in loss of

supply to 220kV Ambewadi bus.

220kV Ambewadi-Ponda line-

1&2 were hand tripped after

deenergization of bus at

Ambewadi.

GD-1

4

Complete outage of

220 kV HSR

substation

06-10-2015

at 16:32 hrs

All connected 220kV lines at

220kV HSR substation i.e.

Somanahalli, EPIP, Hoody and

Nagnathapura tripped during the

incident. Triggering incident was

fault in 220kV HSR-EPIP line

GD-1

Annexure-I

1 of 6

2. ग्रिडडडस्टर्बन्स / ग्रिडइन्सडन्टकावििरण - Details of Grid incidents:

Sr. No.

क्र.

सं.

घटनाकावििरण / Details

of Event





1 Tripping of 400kV

Hassan-Udupi line-2

21-08-2015

at 23:48 hrs,

04-09-2015

at 21:42 hrs,

06-09-2015

at 1:59 hrs,

04-09-2015

at 21:42 hrs,

06-09-2015

at 1:59 hrs,

08-09-15 at

20:35 hrs

400 KV Hassan-Udupi line-2

tripped on receipt of DT from

UPCL end. DR and EL of Hassan

end was not furnished

2

Tripping of 400kV

Neyveli TS-2 –

Pugalur line 25-08-2015

at 16:09 hrs Line got tripped on broken

conductor fault and direct trip was

received at Pugalur end

3 Tripping of HVDC

Bhadrawati pole-1 29-08-2015

at 15:17 hrs Pole-1 blocked due to failure of

PLC AD4301 communication link

4

Tripping of 400kV

Gajwel-Hyderabad

line 05-09-2015

at 08:09 hrs

line tripped at Hyderabad end on

operation of reactor WTI

protection and line was holding

from Gajwel

5

Tripping of 400kV

Nagarjunsagar-

Mahboobnagar line 07-09-2015

at 2:58 hrs

line tripped on operation of over-

voltage protection at

Mahboobnagar and direct trip

received at N’sagar station. DT

receive was observed in DR and

EL of N’sagar station. D.R/EL of

Mahboobnagar was not furnished

to validate the overvoltage

tripping

6

Tripping of

400/220kV

Alamathy ICT-1&2

07-09-2015

at 04:24hrs

Triggering incident was failure of

Y & B phase CT failure in 230kV

Korattur feeder

7

Tripping of 400kV

YTPS-BTPS line

and tripping of

400kV RTPS-YTPS

line

08-09-2015

at 15:58 hrs

400kV YTPS-BTPS line tripped

on zone-2 at BTPS and in Zone-1

at YTPS. 400kV YTPS-RTPS line

tripped at RTPS end on operation

of over-current protection

Annexure-I

2 of 6

Sr. No.

क्र.

सं.


of Event





8

Tripping of 220KV

Tandur -Sedam line

10.09.2015 at

16:35 hrs

Line did not trip at Tamdur end.

FIR, DR EL of Sedam end was

not furnished

9

Tripping of ICT-1&2 at CHITTOOR

15.09.2015 at

16:55 hrs

Tripped on the operation of

directional overcurrent relay

10

Tripping of 400kV

Gajwel-Hyderbad

line

17-09-2015

at 1:45 hrs

Y-phase to earth fault had

occurred in line. 360ms after

occurrence of fault, over-voltage

stg-1 got operated at Hyderabad

end which resulted in a 3 phase

trip and DT send to Gajwe

11

Tripping of ICT-

1&2 at Arasur

substation

22-09-2015

at 15:01 hrs

400/230kV ICT-1 tripped on

operation of winding temperature

and ICT-2 tripped 8 seconds after

tripping of ICT-1 on operation of

back up overcurrent protection

12

Tripping of 400 kV

Guttur-Hiryur line-1

23-09-2015

at 15:45 hrs

Tripped at Guttur end during PT

supply change over. Direct trip

was received at hiryur end.

Similar tripping had occurred at

11:08 hrs on 29-07-2015 and at

17:54 hrs on 18-05-2015.

13

Tripping of 400/220

kV ICT-2 AT VISAKHAPATNAM

24-09-2015

at 18:09 hrs

ICT-2 tripped due to operation od

busbar protection at 220kV VSS

station of APTRANSCO

14

Tripping of 400kV

Gajwel-Hyderabad

line

25-09-2015

at 23:18 hrs

B-phase to earth fault occurred in

line. Line auto-reclosed at gajwel

end and failed to reclose at

Hyderabad. As per FIR of

Hyderabad S/s, over-voltage Stg-1

protection got operated 383ms

after occurrence of fault in B-

phase.

15

Tripping of

400/220kV ICT-3 at

Neelamangala

27-09-2015

at 14:55 hrs

ICT-3 (Y-phase) got tripped on

operation of oil surge relay and it

was found that OSR got operated

due to moisture ingress

16

Tripping of 765kV

Kurnool-Thiruvelam

line-2

29-09-2015

at 12:57 hrs

line tripped on operation of REF

protection of line reactor at

Kurnool end and direct trip was

sent to Tiruvallum end. REF had

operated due to suspected mal-

operation of CT switching relays

Annexure-I

3 of 6

Sr. No.

क्र.

सं.


of Event





17 Tripping of 400 KV

Hassan -Udupi line1 5-10-2015 at 13:33

Line tripped due to B-E fault in

Z2. Main 1 relay tripped in

Z2.Three phase trip operated at

Hassan. Auto relose successful at

other end and line was charging

from other end. Then OV stage 1

picked up in Main2 relay and

operated in OV after the time

delay

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

Sr. No.

Element Date & Time

Reason

1

Tripping of 400kV

Vijayawada-Nellore(AP) line-3

05-09-2015 at

14:43 hrs&06-09-

2015 at 15:01 hrs

line tripped on a B-phase to earth

fault. Line auto-reclosed at

Nellore(AP) end and failed to

reclose at Vijayawada

2

Tripping of 400kV

Ramagundam-Hyderabad line-

4

11-09-2015 at 2:26

hrs R phase to earth fault had

occurred in line and line auto-

reclosed at Ramagundam end and

failed to reclose at Hyderabad end

3

Tripping of 400kV Gooty-

Neelamangala line

15-09-2015 on

23:55 hrs

Line tripped on R-phase to earth

fault and successfully reclosed at

Gooty end and failed to reclose

from Neelamangala end. Main-2

distance protection gave a three

phase trip

4

Tripping of 220kV Gajwel-

Shankarapally line 20-09-2015 at 2:24

hrs line tripped at Gajwel end on R-

Phase to ground fault. Reason for

non-auto reclose could be

established as DR and EL of both

ends were not furnished

4

Tripping of 400kV Udumalpet-

Tirunelveli line-2

23-09-2015 at

14:27 hrs B-phase to earth fault had

occurred in line. Line did not

auto-reclose and got tripped as

over-voltage stage-2 got operated

250 ms after occurrence of fault.

Similar tripping had occurred on

28-07-2015 at 16:48 hrs

5

Tripping of 400kV

Nagapatinam-Trichy line

26-09-2015 at

15:14 hrs

Y phase to earth fault occurred in

line. Line auto-reclosed at Trichy


Nagapatinam.

6

Tripping of 400kV Satenapalli-

Srisailam line1

26-09-2015 at

16:45 hrs

R-phase to earth fault had

occurred in line. Line did not auto

reclose from both ends. Direct trip

receive was observed in both end

Annexure-I

4 of 6

DR’s.

7

Tripping of 400kV Kayathar-

Karaikudi line-2

26-09-2015 at

17:05hrs

R Ph -earth fault had occurred in

line Line auto reclosed at

Karaikudi end and failed to

reclose at Kayathar

8

Tripping of 400kV Kayathar-

Karaikudi line-2

28-09-2015 at

15:42hrs

Y Ph -earth fault had occurred in

line Line auto reclosed at

Karaikudi end and failed to

reclose at Kayathar

9

Tripping of 400kV Neyveli

TS-2 Exp – Pugalur line

29-09-2015 at

16:42 hrs on


occurred in line. Dt was received

at Pugalur from Neyveli 130ms

after occurance of the fault. This

resulted in a 3 phase trip at

Pugalur end.

10

Tripping of 400 kV Kurnool-Srisailam line

03-10-2015 at

04:40 hrs on

Tripped at both ends on Y-Phase

to ground zone-1fault. Attempt for

auto-reclose could not be

established.

11

Tripping of SATTENAPALLI - SRISAILAM 2

05-10-2015 at

16:24 hrs

B-phase to earth fault occurred in

line. Line did not auto-reclose as

DT was received from Srisailam

end.

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

Sr. No.

क्र.

सं.


of Event





1

Tripping of 400kV

Trivandrum-

Tirunelveli line-2

at 16:36 hrs

and 16:50hrs

on 07-09-

2015

line tripped at Tirunelveli on

receipt of DT and line was

holding from Trivandrum

2

Tripping of 400kV

Kalpaka-Khammam-

2

08.09.2015 at

15:37 hrs

Tripped at Kalpaka end only on

receipt of Direct trip from

Khammam

3

Tripping of 400kV

Chittoor-

Krishnapatnam-II

08.09.2015 at

09:04 hrs

Tripped at Chittoor end on receipt

of direct trip from Krishnapatnam

4

400kV VTPS-

Malkaram line-1

10-09-2015

at 11:27 hrs

line tripped on DT receive at

Malkaram end and was holding

from VTPS

5

Tripping of 400kV

Guttur-Hiryur line-2

10:33 hrs on

18-09-2015,

9:40hrs on

19-09-2015,

13:53 hrs on

22-09-2015,

at 10:12hrs

on 30-09-

2015, 02:05

on 01-10-

line tripped at Guttur end only on

direct trip receive and was holding

from Hiryur.

Annexure-I

5 of 6

2015

6

Tripping of 400kV

Guttur-Narendra line

22-09-2015

at 13:53 hrs

line tripped at Guttur end only on


from Narendra

7

Tripping of 400kV

Nellore-Thiruvelam

line-1

24-09-2015

at 10:52 hrs

line tripped at Thiruvelam end on


from Nellore end.

8

Tripping of 400kV

Warangal-

Khammam line

29-09-2015

at 17:06 hrs

line tripped at Warangal end only

due to receipt of direct trip and

line was holding from Khammam

*****

Annexure-I

6 of 6

Annexure-II

Page 1 of 20

Annexure-II

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Annexure-II

Page 3 of 20

Annexure-II

Page 4 of 20

Annexure-II

Page 5 of 20

Annexure-II

Page 6 of 20

Annexure-II

Page 7 of 20

Annexure-II

Page 8 of 20

Annexure-II

Page 9 of 20

Annexure-II

Page 10 of 20

Annexure-II

Page 11 of 20

Annexure-II

Page 12 of 20

Annexure-II

Page 13 of 20

Annexure-II

Page 14 of 20

Annexure-II

Page 15 of 20

Annexure-II

Page 16 of 20

Annexure-II

Page 17 of 20

Annexure-II

Page 18 of 20

Annexure-II

Page 19 of 20

Annexure-II

Page 20 of 20

Meeting

No /

Index

Details of

Event

Date Reason PCSC Recommendations Utility

Responsible

for

implementatio

n

Status of Recommendations

as on 06.10.2015

Remarks

45/II/14 Tripping of

400/220 kV

ICT-1&2 at

Gooty

substation

31-05-2015at

06:37 hrs

As per FIR, ICT-1&2 tripped on

operation of directional

overcurrent and earth fault

protection. It was reported that

there was fault in 220kV

APTRANSCO system

1. APTRANSCO to check resistive reach

of the distance relays on 220 kV Gooty

SS – Gooty RS line

2. APTRANSCO to check time

coordination of distance relay on Gooty

SS – Gooty RS line at Gooty SS with

Gooty ICT’s (1 & 2) back-up protection.

APTRANSCO Yet to be informed Pending

Pending Implementation of PCSC Recommendations (30th to 47th)

Andhra Pradesh

42/II/3 Outage at

Regulapadu

station of

APTRANSC

O

21-02-2015 at

00:49 hrs

Y-Ph Metering PT failed at

220KV

Ragulapadu Substation. Fault got

cleared

by tripping of lines from remote

ends.

APTRANSCO to furnish the remedial

measures taken in consequent to the

tripping

incident along with the status of bus bar

protection and bus coupler at Regulapadu

S/s.

A/R feature to be enabled on

Regulapadu – Alipuira 220 kV inter-state

line.

APTRANSCO Mail received on 27-05-2015:

1)Failed metering PT was replaced with new PT.

2) 220kV Ragulapadu is a single bus system. Hence there

is no provision for bus coupler at Ragulapadu SS.

Mail received on 24-06-2015:

APTRANSCO Vide Ltr. Dt. 23/06/2015, requested

KPTCL to furnish the details of available tele protection

equipments and details of the equipments going to be

procure for enabling the carrier aided protection on

220KV Ragulapadu-Alipura line. Based on the KPTCL

information we will take further necessary action.

Mail recieved on 22-08-2015:

APTRANSCOhas planned to commission ABB make

ETL-41 type PLCC terminal along with NSD-50 type

protection coupler at Ragulapadu end towards Alipura.

vide our Ltr Dt 23-07-2015, it is requested KPTCL to

arrange ABB make ETL-41 cabinet with NSD-50 type

protection coupler for establishing PLC communication

between Alipura- Ragulapadu.

Pending

ANNEXURE-III

Page 1 of 24

44/III/2 Tripping of

400kV

Ghanapur-

Mamidapalli

line

15-04-2015

at 2:03 hrs

Line tripped at Mamidapalli end

only and was holding at

Ghanapur. Overvoltage

protection had operated at

Mamidapalli

TSTRANSCO to make DR

functional at Mamidipalli

TSTRANSCO TSTRANSCO informed vide their mail dated 24.06.15

that the existing relays would be replaced with numerical

relays in DPR works.

Pending

Telangana

1. TSGENCO to disable sensitive earth

fault protection provided as

supplementary to static bus-bar

protection at Srisailam LB (GIS).

2. TSGENCO to set the current setting for

phase-to-ground faults for numerical bus-

bar protection at a

suitable value so that the prominent high-

resistance earth faults occurring within

the bus-zone are

covered at Srisailam LB (GIS).

400kV Srisailam-Mamidapalli

line-2, 400kV Srisailam-

Satenapalli line-2 and 400 kV

Srisailam-Kurnool line tripped

during multiple tripping at

Srisailam power station. 400kV

Srisailam-Mamidapalli-1 and

400kv Srisailam-Satenapalli-1

was kept out of service due over-

voltage conditions. There was no

generation at Srisailam left bank

power station. Triggering

incident was failure of CT in

400kV Srisailam- Satenapalli line-

2 at Srisailam end.

18-08-2015 at

15:25 hrs

Disturbance

in Srisailam

left bank

power station

47/I/1

(GD)

TSGENCO Yet to be informed Pending

ANNEXURE-III

Page 2 of 24

Yet to be informed Pending

Karnataka

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 Mail recieved on 07-07-2015:

1. Retrofit of existing static relays with Numerical version

for lines M.nagar, M.bad and ICT- 1 & 2 -- Inspection of

the Numerical relays at M/s Siemens works completed

on 11-06-2015 and Dispatch clearance has been issued.

Materials received.

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

version – Budgetary offers obtained and is under process.


1. Replacement of Old electromagnetic relays with

Numerical relays has been completed for RTPS-BTPS

line & commissioned on 18.03.2014.

Raichur-PG1 & Raichur-PG2 lines have already

retrofitted with numerical relays.

The retrofitting of electromechanical relays with

Numerical version for ICT-1, ICT-2 and Munirabad line

has been completed.

Retrofitting work for Mehaboobnagar line is pending.

Awaiting for line shutdown.

2. Job order placed on 26.06.2015 on M/s Alstom T&D

India Ltd. Chennai for retrofitting of relays for all 220kV

lines at RTPS.

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

version– Budgetary offers obtained and is under process.

TSGENCO1. TSGENCO to check the reclaim time

of A/R and set it at 25 sec at KTPS.

2. TSGENCO to carry out PLCC end-to-

end testing in coordination with PGCIL

(SR-I) for KTPS – Khammam

line-2; retrofitting of Protection Coupler

may be carried out based on the test

results.


occurred in line. From Khammam

end DR it was observed that the

relay after dead time tried for

auto-reclose. The fault was

persisting and relay gave a single

phase

trip instead of a 3 phase trip after

1.25sec. R& B pole voltage dip

after 2 secpossibly due to

operation of pole discrepancy.

Auto-reclose close command

observed after 2.5 seconds

and all poles got closed.

30-07-2015 at

6:08 hrs

Tripping of

400kV

Khammam-

KTPS line-2

47/II/6

Pending

ANNEXURE-III

Page 3 of 24

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.


1. Retrofit of existing static relays with Numerical version

for lines M.nagar, M.bad and ICT- 1 & 2 -- Inspection of

the Numerical relays at M/s Siemens works completed

on 11-06-2015 and Dispatch clearance has been issued.

Materials received.

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

version – Budgetary offers obtained and is under process.


1. Replacement of Old electromagnetic relays with

Numerical relays has been completed for RTPS-BTPS

line & commissioned on 18.03.2014.

Raichur-PG1 & Raichur-PG2 lines have already

retrofitted with numerical relays.

The retrofitting of electromechanical relays with

Numerical version for ICT-1, ICT-2 and Munirabad line

has been completed.

Retrofitting work for Mehaboobnagar line is pending.

Awaiting for line shutdown.

2. Job order placed on 26.06.2015 on M/s Alstom T&D

India Ltd. Chennai for retrofitting of relays for all 220kV

lines at RTPS.

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

version– Budgetary offers obtained and is under process.

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. Shut down of lines availed to commission the auto

reclosing schme for 400 kV line at BTPS.


P.O. placed for procurement of timers for A/R function.

Work shall be completed by July 2015.


P.O. placed for procurement of timers for A/R function.

Work shall be completed by August 2015.


P.O.placed for procurement of timersforA/R function.

Materials received at site. Work shallbecompleted by

December2015.

Pending

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.


submit the implementation status of

PSAG-10 recommendations within a

week’s time.


1. Cover -1 of the bid is scheduled for open eing on

25.06.2015.

2. As per the recommendations of PSAG, Relays were

temporarily rearranged. testing & commissioning

completed with the assistance of KPTCL.


NIT floated on 5.5.15 through e-portal. Bid evaluation

completed. Obtaining of Administration approval to place

P.O is in progress.

However, as per therecommendationsof PSAG-10, Relays

weretemporarilyrearranged.Testing & commissioning

completed with the assistanceofKPTCL.

Pending

ANNEXURE-III

Page 4 of 24

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.


speed up the installation of Numerical

Distance Protection relay in Kadra

–Kaiga and Kodasalli –Kaiga.


submit the implementation status of

PSAG-10 recommendations within a

week’s time.


1. Cover -1 of the bid is scheduled for open eing on

25.06.2015.

2. As per the recommendations of PSAG, Relays were

temporarily rearranged. testing & commissioning

completed with the assistance of KPTCL.


NIT floated on 5.5.15 through e-portal. Bid evaluation

completed. Obtaining of Administration approval to place

P.O is in progress.

However, as per therecommendationsof PSAG-10, Relays

weretemporarilyrearranged.Testing & commissioning

completed with the assistanceofKPTCL.

Pending

Mail recieved on 27-05-2015 (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.

Mail received on 29-07-2015 (KPTCL):

Initial Tendering stage

Pending

38/GD/3.

1

GD-1 at

Mahalingapu

ra 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 27-05-2015 (KPTCL) & 29-07-2015:

1.Existing Back up relays will be replaced by numerical

type distance relays.Procurement is in tendering stage.

Remaining observations were attended.

34/I/6 400/220 kV

ICT-1 & 2 at

MUNIRAB

AD

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

Pending

ANNEXURE-III

Page 5 of 24

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

KPTCL Mail received on 27-05-2015 & 29-07-2015:

Latest satus of implementatin of Phase-1 &2

recommendations, PSAG 4,5 and 8 is being obtained

from field. The Status will be updated witin a weeks time.

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.

KPTCL Mail received on 27-05-2015 & 29-07-2015:

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

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 provide the details of the

tripping of Supa hydro station connected

downstream from 110 kV bus.

KPTCL Mail received on 28-04-2015:

1. In view of operating 220kV Ambewadi SS in split bus

mode, action is being taken up by KPTCL . Problem in

the 220kV bus coupler breaker is attended and isolator

overhauling work is under progress. Spilt bus

operation at Ambewadi will be made possible at the

earliest.

2. ICT protection system at Ambewadi and trippings

occured at Supa GS during the instance is checked up

and remedial measures already furnished in this regard.


Action is being taken by KPTCL for operating Ambewadi

in split bus mode. Problem in bus coupler breaker is

attended.Isolator overhaulling work is completed.PTs are

already provided to 220kV Bus-II. After commissioning

of Bus-II PTs, Ambewadi can be operated in split bus

mode. Pending works will be completed within a months

time.

Pending

ANNEXURE-III

Page 6 of 24

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.

KPTCL Mail recieved on 29-07-2015:

Carrier protection is being restored for 220kV Sedam-

Tandoor line at Sedam end. After restoring the carrier

protection , AR will be enabled.

Pending


1. Procurement of Bus bar and LBB protection is in the

final tendering stage.

2. Action is being taken to restore the carrier protection

for 220kV Sedam-Tandoor line. AR will be enabled

after restoration of PLCC.

KPTCL 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.

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.

27-01-2015 at

8.00 hrs

Complete

outage at

220kV

Sedam

Substation of

KPTCL (GD-

1)

41/I/4 Pending

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 Mail received on 28-05-2015:

1. Main-2 relays already installed and commissioned.

2. DC fuses are intact. Till date no such incidence

occurred.

3. Possibility of DC-1 & DC-2 arrangement and splitting

of DC will be reviewed.


1. Completed.

2. Completed.

3. Possibility of DC-1 & DC-2 arrangement and splitting

of DC will be reviewed.

Pending

ANNEXURE-III

Page 7 of 24

42/I/1

(GD)

Complete

outage of

220kV

Sedam

substation of

KPTCL

15-02-2015 at

14:24 hrs

Fault occurred in 220kV Sedam-

Shahpur line

1. KPTCL to provide Bus Bar protection

and LBB protection at Sedam S/s and

furnish

the status of their implementation to

PCSC forum.

2. KPTCL to implement A/R feature on

220 kV Sedam-Tandur inter-state line.

KPTCL Mail received on 27-05-2015: 1. Bus Bar protection will

be provded under R&U.

2. A/R yet to be enabled.





for 220kV Sedam-Tandoor line. AR will be enabled after

restoration of PLCC.

Pending

42/I/2

(GD)

Complete

outage of

220kV

Ambewadi

substation of

KPTCL

12-03-2015 at

7:51 hrs

Fault in 220kV Ambewadi-

Nagjheri line-2

1. KPTCL shall provide A/R feature on

Ambewadi – Ponda 220 kV D/C inter-

state line.

2. 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.





for 220kV Sedam-Tandoor line. AR will be enabled after

restoration of PLCC.

Pending

42/II/2 Tripping of

220kV

Chikodi-

Talandage

and

220kV

Chikodi-

Mudshingi

line

20-02-2015 at

06:40 hrs

Lines tripped during test charging

220kV

Chikodi-Belgaum line-2 from

Chikodi

end.

1. KPTCL to provide A/R feature on the

220 kV Chikkodi – Talandage, and 220

kV Chikkodi –Mudashinge inter-state

lines.

2. KPTCL to carry out E/F relay

coordination for Chikkodi - Talandage

and Chikkodi –

Mudashinge lines in coordination with

Maharashtra.


Carrier protection is put in to service. AR will be enabled

at the earliest.


Action is taken for enabling AR for Mudashinge and

Talandage lines. Work is scheduled during first week of

August 2015.

Pending


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

KPCL to check the possibility of

providing line differential protection

between RTPS and Yermarus stations.

KPCL KPCL vide their mail dated 07.07.2015 informed that

revised relay settings would be incorporated in co-

ordination with KPTCL.


Revised relay settings are awaited from KPTCL.

Revised relay settings furnished by KPTCL will be

incorporated in co-ordination with KPTCL.

Pending

ANNEXURE-III

Page 8 of 24


400kV

Raichur-

BTPS line

01-06-2015 at

01:02 hrs

line tripped on R-phase to earth

fault. Line did not auto-reclose

KPCL to make A/R operational on 400

kV RTPS – BTPS S/C line at both ends.

KPCL Mail received on 07-09-2015:

PSL, Settings, Event & DR files have been sent to OEM

for checking & reviewing. Awaiting reply from OEM for

the same.

Pending

46/II/21 Trippings at

220kV

Raichur TPS

07-06-2015 at

01:35 hrs

1. KPCL to check the operation of anti-

pumping relay on 220 kV side and keep it

in healthy condition.

2. KPCL to provide manual reset to the

220 kV side master trip relay.

3. KPCL to use both the 220 kV buses as

main buses under normal operation, and

should go for single bus operation only

during emergencies.

KPCL Yet to be informed Pending

Mail received on 07.07.2015:

The matter had been discussed with KPTCL. KPTCL

recommended to keep Zone-2 time lever to zero. If this is

acceptable, then the same shall be incorporated

immediately.


The matter has been discussed with KPTCL. KPTCL

recommended to keep Zone-2 time lever to zero.

If this is acceptable to SRLDC, then the same shall be

incorporated immediately.Reply from SRLDC is awaited.

Pending44/II/3 Tripping of

220kV

Kaiga-

Kodasalli

and 220kV

Kodasalli-

Nagjheri line-

1

22-04-2015 at

20:28 hrs

220kV Kodasalli-Nagjheri line-1

tripped from Kodasalli end on

operation of

distance protection, zone-2.

220kV Kodasalli-Nagjheri line-

1&2 is kept opened from

Nagjheri end, hence fault

could not be cleared with carrier

aided protection. Backup earth

fault relay at

Kaiga end got operated during the

event and resulted in tripping of

220kV Kaiga-

Kodasalli line from Kaiga end.

1. KPCL to check the possibility of

implementing Permissive Over Reach

(POR) with Echo feature at Kodasally

end.

2. If the above is not possible, KPCL shall

check the possibility of keeping the

220kV

Kodasalli-Nagjheri lines OPEN at

Kodasalli end and idle-charged at

Nagjheri end, and

implement the same.

KPCL

KPTCL Mail receieved on 01-08-2015:

The problem is attended on 31.07.2015 and controls of

both the bays have been made independednt with effect

from 15.22Hrs.

KPCL1. KPCL to resolve the Lingapur line CB

Isolator problem without further delay.

2. Till the above issue is resolved, KPCL

shall use the said by-pass arrangement

only after revising the remote end

(Alipura and Lingapur) relay settings

suitably.Otherwise, the bypass isolator

and the Lingapur line CB shall be kept

open.

3. KPCL to furnish an action taken report

on these trippings to PCSC forum.

On 05-07-2015, ICT-1 tripped on

operation of 400kV side earth

fault and over current and Earth

fault relay. The reason for

tripping of ICT-1 on 06-07-2015

was not furnished in FIR

5-07-2015 at

20:56 hrs& 06-

07-2015 at 6:28

hrs

Tripping of

400/220kV

ICT-1 at

Bellary TPS

46/II/16 Pending

ANNEXURE-III

Page 9 of 24


220kV

Ambewadi-

Ponda line-2

02-08-2015

at 13:20 hrs

Line tripped on a transient fault

in B-phase. There is no

provision for auto reclose.


220kV

Ambewadi-

Ponda line-1

08-08-2015 at

10:51

hrs and 09-08-

2015 at

11:15 hrs

Line tripped on a B-phase to

earth fault. Line tripped as there

is no provision for auto-reclose

220kV RTPS-Lingasugur line-2

tripped at

TPS end on operation of distance

protection zone-1. 400/220kV

ICT-2 got

tripped on operation of earth fault

protection. 220kV RTPS-

Lingasugur line-

1&3 tripped on distance

protection

zone-2 and zone-3 respectively.

Due to

tripping of ICT-2, the running

units got

overloaded and it was mentioned

that

under frequency occurred as units

are

on load control. The Units got

tripped

on under frequency.

KPTCL to activate non-directional Over

Current protection with a time delay of

600-800 msec for Fuse

failure condition at Lingasugur.

KPTCL Yet to be informed Pending06-08-2015 at

4:51 hrs

Tripping of

Unit-1&2

along with

400/220kV

ICT-2 at

Raichur TPS

47/II/13

Till A/R is put into service on Ambewadi-

Ponda line-1, KPTCL to reduce Zone-2

time setting to zero sec. at Ambewadi

end.

KPTCL Yet to be informed Pending

ANNEXURE-III

Page 10 of 24


220kV

Ambewadi-

Ponda line-1

17-08-2015

at 13:20 hrs

Line tripped on a transient fault .

There is no provision for Auto

reclose.

45/II/12 Multiple

tripping at

400/230kV

Alamathy

substation

25-05-2015at

09:08hrs

As per FIR, failure of R-phase

CT of 230kV Alamathy-Manali

feeder occurred at Alamathy end.

Hence 230KV Bus bar protection

Zone 1 & 2 Operated at Alamathy

substation. All the 230KV

feeders, 230KV Bus Coupler,

ICT-3, 4 & 5 LV breakers got

tripped.

TANTRANSCO to furnish a detailed

tripping report including reasons for

delayed clearance of fault at Almathy.

TANTRANSC

O

TANTRANSCO's letter dtd 14-07-2015 received, but

reasons for the delayed clearance of the third fault not

furnished.


The faults were cleared with out time delay at Alamathy

SS. Detailed Tripping report sent vide

Lr.No.CE/P&C/SE/D/ EPC4/AEE3/F.SRPC/ D.21/15,

dated 14.07.2015.

The reasons for the delayed clearance of the third fault

not furnished.

Pending

KSEB Mail received on 31-07-2015:

1. Reducing the sensitivity of REF protection of Unit # 4,

5, 6 at Idukki PH: - Generation wing is planning to

purchase new transformer management relays with low

impedance REF protection. Purchase procedures initiated.

2. The replacement/ repair of faulty breakers are under the

consideration of Generation wing. Breakers will be

replaced / repaired in a phased manner. Unit #3 breaker

was replaced with available breaker from the 220kV

IDMD feeder. The 220kV CBs of unit #2 and unit #3 will

be replaced with in two months.

3. No abnormalities were noticed in the PLCC equipment

at New Pallom station. It is kept under observation.

Till A/R is put into service on Ambewadi-

Ponda line-1, KPTCL to reduce Zone-2

time setting to zero sec. at Ambewadi

end.

KPTCL Yet to be informed Pending

Tamil Nadu

Kerala

Line-2 tripped on R-phase to

earth fault.

Line autoreclosed at SVChatram


Alamathy end. Bphase to earth

fault in line-1. Line tried for A/r

but due to permanent fault line

did not reclose. ICT tripped on

operation of over flux protection.

TANTRANSCO was requested to swap

the relays between two stations, so that

Main-1 and Main-2 will be of different

make at each station.

TANTRANSC

O

TANTRANSCO vide their mail dated 24.06.15 informed

that different relays in Main-I & Main-II would be

ensured at the earliest.


Different relays in Main-I & Main-II will be ensured.

Pending29-03-2015 at

15:29 hrs

43/II/5 Tripping of

400kV

Alamathy-

SVChatram

line-1&2

and

400/230kV

ICT

at

S.V.Chatram

Pending44/I/1

(GD)

Complete

outage of

Idukki Hydro

Power

Station (GD-

1)

28-04-2015 at

12:30 Hrs

220 kV breaker of unit-3 at

Idukki Power

house flashed and bus differential

protection

acted. All Generators (6Nos.)

along with all

220 kV feeders tripped during the

incident.

1. KSEB to reduce sensitivity of REF

protection appropriately at Idukki PH.

2. KSEB to replace/ repair the faulty

breaker.

3. KSEB to check the PLCC equipment at

New Pallam and inform the remedial

measures taken to PCSC forum.

ANNEXURE-III

Page 11 of 24

44/I/2

(GD)

Disturbance

in North

Kerala

system (GD-

1)

09-05-2015 at

11:18hrs

Blackout had occurred in North

kerala i.e.,

Complete outage of 220kV

Mylatty, 220kV

Taliparamba, 220kV Kanhirode,

220kV Vadakara and Shoranur

substations occurred due

to tripping of 220kV Thrissur-

Areacode and

220kV Thrissur-Shoranur

feeders.

1. KSEB to replace Quadramo relay

(static) with numerical one at

Madakkathara station.

2. After finalizing the SPS, KSEB shall

share the details of the revised SPS logic

for the

North Kerala system to PCSC forum.


1. All quadramo relays in Madakkathara is working in

good condition. Replacement of the same with numerical

one will be carried out in a phased manner.

2. The SPS settings were revised after this disturbance

and the revised logic is already forwarded to that office

vide reference (2) above. Copy of the same is attached

Pending


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.

PGCIL Mail received on 02-09-2015:

The issue was referred to BPL and OEM suggested to

upgrade the panels with design modifications. LOA has

been placed on BPL for the same. Work is expected to be

completed by Aug'15 end.

Pending


1. Reducing the sensitivity of REF protection of Unit # 4,

5, 6 at Idukki PH: - Generation wing is planning to

purchase new transformer management relays with low

impedance REF protection. Purchase procedures initiated.

2. The replacement/ repair of faulty breakers are under the

consideration of Generation wing. Breakers will be

replaced / repaired in a phased manner. Unit #3 breaker

was replaced with available breaker from the 220kV

IDMD feeder. The 220kV CBs of unit #2 and unit #3 will

be replaced with in two months.

3. No abnormalities were noticed in the PLCC equipment

at New Pallom station. It is kept under observation.

PGCIL34/I/7 HVDC

BHADRAV

ATHI 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 Reply received during 46th PCSC meeting:

Being pursued with POWERGRID, WR-1

Pending44/I/1

(GD)

Complete

outage of

Idukki Hydro

Power

Station (GD-

1)

28-04-2015 at

12:30 Hrs

220 kV breaker of unit-3 at

Idukki Power

house flashed and bus differential

protection

acted. All Generators (6Nos.)

along with all

220 kV feeders tripped during the

incident.

1. KSEB to reduce sensitivity of REF

protection appropriately at Idukki PH.

2. KSEB to replace/ repair the faulty

breaker.

3. KSEB to check the PLCC equipment at

New Pallam and inform the remedial


Pending

ANNEXURE-III

Page 12 of 24

42/II/7 Tripping of

400kV

Jeypore-

Gazuwaka

line-

1&2 and

tripping of

HVDC back

to back pole-

1&2 at

Gazuwaka

23-02-2015 at

13:34 hrs

HVDC pole-1 got tripped due to

failure

of 4 no. power supply card.

HVDC

pole-2 tripped on DC low voltage

trip.

400kV Jeypore-Gazuwaka line-

1&2

tripped due to operation of Over

voltage

protection at Gazuwaka end.

PGCIL (SR-II) to submit the report of

M/s ABB’s on preventing supply card

failures.

PGCIL Yet to be informed Pending


HVDC pole-

1&2

at Gazuwaka

and

400kV

400kV

Jeypore

Gajuwaka

line -1

14-03-2015 at

17:12 hrs

HVDC Pole-1 at Gazuwaka

tripped due to

tripping of filter banks and Pole-

2 tripped

due to operation of differential

protection.

400kV Jeypore-Gazuwaka line-1

tripped

on over-voltage from Gazuwaka

end.

PGCIL (SR-I) to furnish the reasons for

Converter Transformer differential

protection

operation for Pole-2 along with the

remedial measures taken.


Operation is in-order as per OEM manual (ABB HVDC)

Pending


HVDC

Bhadravathi

Pole-1

18-03-2015 at

13:55 hrs

Pole tripped due to failure of

auxiliary supply

PGCIL (SR-I) to submit the compliance

report on PSAG-11 recommendations to

PCSC

forum.


Tertiary Transformer charged and auxiliary power for

HVDC is being availed from tertiary widings of ICT.

Pending

43/II/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

PGCIL (SR-II) to check the possibility of

providing re-trip feature in LBB relay.

PGCIL Mail received on 02-09-2015:

The scheme was tested thoroughly found normal.

Pending

ANNEXURE-III

Page 13 of 24

44/I/3

(GD)

765 kV

Raichur-

Sholapur line

1 &

2 tripped

24-05-2015

at 19:19 hrs

Tripped on Overload. 1. PGCIL to provide the status of

healthiness of SPS contact logic in

SRLDC’s SCADA.

2. PGCIL to furnish the details of the

implemented SPS-7 scheme including

logic diagram to PCSC forum.


44/II/6 Multiple

tripping at

Vemagiri

substation of

APTRANSC

O

25-04-2015 at

10:04

hrs

400kV Vemagiri-Vijayawada line-

1&3, 400kV Vemagiri-Goutami

line-2, 400kV Vemagiri-

Konaseema line-2 and

400/220kV ICT-2 at Vemagiri

tripped during the incident.

Triggering incident

was failure of B-phase L.A in

400kV Vijayawada-Vemagiri line-

1 at Vemagiri end.

1. PGCIL (SR-I) to enable Auto reclosure

feature at Vijayawada end.

2. PGCIL (SR-I) to check distance relay

settings for Vijayawada – Vemagiri line

3, and

furnish a compliance report to PCSC

forum.


PGCIL (SR-I) to check healthiness of

PLCC panels at Hyderabad SS, and

repair/ replace

them, if necessary.

400kV Ramagundam-Hyderabad

line-3 at

ramagundam end only due to DT

receive.

400kV Hyderabad-Malkaram line-

1

tripped at Hyderbad end only and

was holding from Malkaram end.

400kV Bus-1 at Hyderabad due

to operation of bus bar protection.

23-04-2015 at

15:11 hrs

Tripping of

400kV

Ramagunda

m-Hyderabad

line-3,

400kV

Hyderabad-

Malkaram

line-1 and

400kV Bus-1

at Hyderabad

44/II/4 PendingYet to be informedPGCIL

ANNEXURE-III

Page 14 of 24

44/II/7 Tripping of

765kV

Kurnool-

Tiruvalam

line-1

and 765kV

Kurnool-

NPS-1

25-04-2015 at

18:10 hrs

REF protection of Line reactor of

Nellore-1&2 and Tiruvalam line-

1 maloperated

due to DC earth fault

1. PGCIL (SR-I) to submit the action

taken report on the measures suggested by

their OEM.

2. PGCIL (SR-I) to check for the

availability of Chatter Disable feature in

P141 and

configure it appropriately to block

operation of REF protection on DC

fluctuations.


44/II/8 Tripping of

400kV

Gooty-NPS

line-2

26-04-2015 at

13:16

hrs


occurred in

line. Lines auto-reclosed at gooty

end

and later tripped due to DT

receive from

NPS end.

PGCIL (SR-I) to coordinate STUB

protection settings with the distance

protection time

settings at NPS.



400/220kV

ICT-1 at

Gooty

Substation

03-06-2015 at

12:30 hrs

ICT tripped due to mal-operation

of differential relay

1. PGCIL to follow IS and CEA

regulations while carrying out

maintenance work.

2. PGCIL to furnish a report on what

caused the ICT-1 tripping including

remedial measures.


To avoid tripping of transmission lines on

transient faults, PGCIL is recommended

to carry out periodic patrolling of lines,

and ensure their proper maintenance by

carrying out jungle/ bushing clearance

and trimming of tree branches within the

RoW of transmission lines 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).

PendingYet to be informedPGCIL45/II/15 Tripping of

765kV

Raichur-

Solapur line-

1&2

03-05-2015 at

4:13 hrs

Lines tripped on transient fault.

Auto reclose was un-successful.

SR &NEW grid separated due to

tripping of 765kV lines

ANNEXURE-III

Page 15 of 24

46/II/1 Tripping of

400/220kV

ICT-2 at

Nagarjunsaga

r Station

16-06-2015 at

18:12 hrs&

19:18 hrs

ICT-2 tripped due to mal-

operation of 86B relay due to

suspected DC earth fault.

PGCIL (SR-I) to furnish a detailed

report on ICT-2& Bus II outage at 19.18

hrs on 16.06.2015 along with the

remedial measures taken.


46/II/4 Tripping of

400/220kV

ICT-2 at

Gooty

substation

22-06-2015 at

13:06 hrs

At 220kV Gooty Switching

Station, 220KV Gooty Receiving

Station feeder line side Y-Phase

jumper connected between line

isolator to boom resulting in a

220kV Bus fault. This resulted in

tripping of ICT-2 and 220kV

feeders connected to 220KV BUS-

II

PGCIL (SR-I) to furnish a detailed

report as to what caused LBB operation at

400 kV Gooty SS along with the remedial

measures taken.



400kV Gooty-

NPS line-1

01-07-2015 at

09:59 hrs

Breaker at NPS end tripped on

Direct Trip receipt from NPS

end. After 4 seconds, over voltage

protection operated at NPS end as

observed from EL, and direct trip

was sent to Gooty.

PendingYet to be informedPGCIL1. PGCIL (SR-I) to furnish a report

detailing the sequence of events including

the remedial measures taken to PCSC

forum.

2. PGCIL (SR-I) to verify and ensure

time-synchronizationof DR& EL with

GPS at both Gooty and NPS.

3. PGCIL (SR-I) to check and resolve,in

co-ordination with APTRANSCO, the

professed Phase-Discrepancy that is

found to be occurring between 400 kV

Gooty (PG) SS and the surrounding 220

kV network of APTRANSCO in the

event of a fault.


HVDC

Talcher-

Kolar Pole-2.

26-05-2015 at

17.55 hrs

DC line fault PendingYet to be informedPGCILTo avoid tripping due to transient faults,

PGCIL (SR-I) is recommended to carry

out periodic patrolling of lines, and

ensure proper maintenance of

transmission lines by carrying out jungle/

bushing clearance and trimming of tree

branches within the RoW of transmission

lines 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).

ANNEXURE-III

Page 16 of 24


HVDC

Bhadrawati

Pole-1

05-08-2015 at

10:53 hrs

Main pump-2 of valve cooling

got

tripped during dip in 33kV

auxiliary bus

voltage. Valve cooling flow got

reduced

due to tripping of pump and

resulting in

tripping of pole-1

PGCIL (SR-I) to furnish compliance

report on PSAG-11 recommendations

without further delay to PCSC

forum.


765 kV

RAICHUR -

SHOLAPUR

1 and 2

04-09-2015 at

19:25 hrs

Sholapur -1 and 2 Feeder got

tripped at

Raichur end on operation of over

current

protection in Main-1 distance

relay and

holding from Solapur end on

04.09.2015 at

19:24:42 Hrs


400kV Gooty-

NPS line-1

01-07-2015 at

09:59 hrs

Breaker at NPS end tripped on

Direct Trip receipt from NPS

end. After 4 seconds, over voltage

protection operated at NPS end as

observed from EL, and direct trip

was sent to Gooty.

PendingYet to be informedPGCIL1. PGCIL (SR-I) to furnish a report

detailing the sequence of events including

the remedial measures taken to PCSC

forum.

2. PGCIL (SR-I) to verify and ensure

time-synchronizationof DR& EL with

GPS at both Gooty and NPS.

3. PGCIL (SR-I) to check and resolve,in

co-ordination with APTRANSCO, the

professed Phase-Discrepancy that is

found to be occurring between 400 kV

Gooty (PG) SS and the surrounding 220

kV network of APTRANSCO in the

event of a fault.

46/II/22 Separation of

SR-grid and

NEW-grid

28-07-2015 at

11.52.22 hrs.

PendingYet to be informedPGCIL1. PGCIL (SR-I) to obtain from PGCIL

(WR-l) the reasons for DT receipt from

Sholapur end and furnish thesame along

with the remedial measures taken to

PCSC forum.

2. PGClL (SR-I) to verify the logic

implemented of SPS-1 and SPS-7 for the

76S kV Raichur - Sholapur link

byavailing the line shutdown at the

earliest opportune time.

3. PGCIL (SR-I) to furnishthe details of

the implemented SPS-1 and SPS-7

schemes including their logicdiagrams to

PCSC forum.

47/II/18 1. PGCIL (SR-I) to check the A/R scheme

implemented through BCU’s at all its

GIS/ SAS substations for correct

operation.

2. PGCIL (SR-I) to ensure time-

synchronization of DR & EL of 765 kV

Kurnool SS with GPS.

3. PGCIL (SR-I) to sort out the LEGEND

ISSUE related to tripping of the lines in

the Event Logger of Raichur.

4. PGCIL (SR-I) to check & ensure the

functionality & healthiness of

synchronization facility at Raichur end at

the earliest opportune time.


ANNEXURE-III

Page 17 of 24

765 KV

RAICHUR –

KURNOOL

2

04-09-2015 at

19:25 hrs

Kurnool -II Feeder got tripped on

B-N fault

and holding from Kurnool end

(successfully

auto-reclosed at Kurnool end)

subsequently

tripped at other end on operation

of Over

Voltage stg-1 protection at

Raichur end on

04.09.2015 at 19:24 Hrs

47/IV/1 Tripping of

400kV

Kayathar-

Karaikudi

line-

2

26-07-2015

at 23:03 hrs

Line tripped on operation of

overvoltage protection at

Karaikudi end. However voltage

was continuously observed in

D.R of Karaikudi station.

PGCIL (SR-II) to adopt SRPC provided

voltage grading for OVR, Stage-I

operation for the 400 kV lines emanating

from Karaikudi.



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

UPCL to revise their DEF relay

settings.

UPCL Mail recieved on 28-04-2015: Revised settings

issued to UPCL on 27-04-2015 for implementation.

Mail received on 27-05-2015: Revised settings have to

be implemented by UPCL

Pending with

UPCL

47/II/18 1. PGCIL (SR-I) to check the A/R scheme

implemented through BCU’s at all its

GIS/ SAS substations for correct

operation.

2. PGCIL (SR-I) to ensure time-

synchronization of DR & EL of 765 kV

Kurnool SS with GPS.

3. PGCIL (SR-I) to sort out the LEGEND

ISSUE related to tripping of the lines in

the Event Logger of Raichur.

4. PGCIL (SR-I) to check & ensure the

functionality & healthiness of

synchronization facility at Raichur end at

the earliest opportune time.


Others37/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

Mail recieved on 28-04-2015: Revised settings

issued to UPCL on 27-04-2015 for implementation.

Mail received on 27-05-2015: Revised settings have to

be implemented by UPCL

Pending with

UPCL

ANNEXURE-III

Page 18 of 24


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.

CEPL to 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


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


400kV

Coastal

(CEPL)-

Tuticorin

pooling

station

20-04-2015

at 12:35 hrs

Line tripped at Coastal energen

end only and was holding from

TTRNPS

CEPL to furnish a detailed report on this

trip event to PCSC forum.

CEPL Yet to be informed Pending

44/IV/8 Tripping of

400kV

Hassan-

UPCL line-2

06-05-2015 at

15:37 hrs

Y-phase to earth fault in line.

Line auto reclosed at

Hassan end and did not reclose at

UPCL

UPCL to check A/R relay operation at

their end.

UPCL Yet to be informed Pending

46/II/3 Tripping of

400kV

Ramagunda

m-Dichipalli

line

21-06-2015 at

03:27 hrs

Line tripped on operation of

overvoltage protection at

Ramagundam end and direct trip

was received at Dichipalli. Over-

voltage operation could not be

established with D.R & E.L

submitted by Ramagundam

station.

1. NTPC, Ramagundam to investigate

the reasons for Over Voltage alongside

checking the drop off- to- pick-up ratio of

the OV relay.

2. The tripping is not as per the grading

adopted for Overvoltage, Stage-I

protection (Grading is C2: 110% and 6

sec time delay) at Ramagundam. NTPC,

Ramagundam to check up the same.

NTPC Yet to be informed Pending

ANNEXURE-III

Page 19 of 24


400kV

Vemagiri –

GVK (JPD)

line-2

16-07-2015

at 17:02 hrs


occurred in line. Line auto

reclosed at Vemagiri end and

failed to reclose at GVK end.

GVK to put A/R into service at GVK

Jegurupadu end on 400 kV GVK

(Jegurupadu) – Vemagiri line-2.

GVK 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


Raichur end.

KPTCL:

PD (pole discrepancy) time delay would

be changed.

PGCIL /

KPTCL


38/II/5 400kV

Ramagunda

m-

Hyderabad

line-4

27-10-2014 Line tripped on Bphase

to earth fault.

Line did not auto

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

Miscellaneous

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.


Revised settings issued to UPCL on 27-04-2015 for

implementation.

Mail received on 27-05-2015 (KPTCL):

Revised settings have to be implemented by UPCL

Pending with

UPCL.

ANNEXURE-III

Page 20 of 24

40/II/3 Tripping of

400

kV

TALAGUPP

A

– 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

Mail received on 27-05-2015 (KPTCL) & 29-07-2015:

End to end testing of PLCC has been done and problem in

the PLCC is atttended.

Phase discripancy in the relay operation is to be

checked jointly.


Problem is in identification of phases at Talguppa end. To

be rectified by M/s KPTCL.

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 Mail received on 02-09-2015:

All the relay settings were checked and found ok

Pending

42/II/1 Tripping of

400kV

Coastal-

Tuticorin PS

line

19-02-2015 at

16:37 hrs

Line tripped at Coastal end only

due to suspected PLCC

maloperation

and was holding from

Tuticorin PS end. Running Unit

at

Coastal energen also got tripped

during the event.

PLCC end-to-end testing shall be carried

out by CEPL and Tuticorin PS (PGCIL-

SR II) by

06.04.2015.

CEPL/

PGCIL(SR-II)


On 11.06.2015 PLCC testing carried out by M/s ABB

Engineer. ABB suspects that the problem is with

frequency interference related issue, and suggested to

change to new frequecies.

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

Mail received on 26-05-2015 from TSTRANSCO:

On 27-12-2014 PGCIL requested to arrange services of

OEM(Manufacturer)for identifying the problem.

TSTRANSCO arranged the same on 06-01-2015 and the

manufacturer testing and concluded that the problem in

not in the newly erected digital protection coupler at both

ends and the issue is related to relay panel at Ghanapur.

[OEM minutes enclosed]

Pending

ANNEXURE-III

Page 21 of 24

43/II/12 Multiple

tripping at

400kV

Raichur(PG)

and Raichur

thermal

power station

of

KPCL

11-04-2015at

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

KPCL, KPTCL and PGCIL (SR-I) to

furnish the action taken report on the

recommendations given by PSAG

members held at Raichur on 22-04-2015

and

23-04-2015.

KPCL/KPTCL/

PGCIL(SR-I)


Tripping of

Unit 1 at

NCTPS

24-05-2015

at 19:13 hrs

ID Fan trip

Tripping of

Unit 1 at

MEPL

24-05-2015

at 19:13 hrs

Coal Mill tripped

Tripping of

Unit 1 at

Krishnapatna

m

24-05-2015

at 19:17 hrs

Generator Protection operated

Mail received on 26-05-2015 from TSTRANSCO:

It is found that the main-2 ABB make REL316 type

distance relay was defective and same was replaced with

MICOM P444 by M/s.PGCIL on 23.04-2015. After

replacement of main-II, DR can be extracted from this

relay. For EL in to service, some field winding is pending

which is being taken up in this month.

Pending

44/I/3

(GD)

1. All Tripped units, viz.,

Krishnapatinam, MEPL, Raichur,

NCTPS to submit a detailed report

on this event including the remedial


2. KPCL to check the excitation system of

Unit 8 of RTPS, and submit the remedial

measures

taken to PCSC forum.

KPCL/ MEPL/

APGENCO/

TNEB

TANGEDCO vide their mail dated 07.07.2015 informed

that as per the discussion and recommendation of 44th

meeting of PCSC held on 28.05.2015, a time delay of 2

Sec had been introduced for the above tripping for all the

ID fans at NCTPS-II.

MEPL vide their mail dated 14.09.2015 informed that

they have implemented 2 seconds delay for under voltage

tripping of all Drag Chain Feeder Conveyors. And this

has been done for both the Units.

Pending

42/II/18 Multiple

tripping at

Raichur

thermal

power station

of

KPCL

09-03-2015 at

06:36 hrs

400kV Raichur TPS-

Raichur(PG) line- 1&2, 400kV

Raichur-Mahboobnagar,

Unit#7 and ICT-2 at RTPS

tripped during the incident. B

phase to earth fault had occurred

in 400kV Raichur TPS-Raichur

line-1

1. KPCL to review REF setting (DMT or

IDMTL) for unit-7 by first week of April,

2015 and

inform the same to PCSC forum.

2. TSTRANSCO to furnish

Mehaboobnagar’s DR and EL and the

reasons for distance relay

operation at their end within a week’s

time.

3. PGCIL (SR-I) to rectify the issues

relating to A/R operation, relay reach

(Z2), reverse reach

(Z4) and SOTF auxiliary contacts within

a week’s time, and submit the actions

taken to

PCSC forum.

KPCL/TSTRA

NSCO/PGCIL

(SR-I)

ANNEXURE-III

Page 22 of 24

Tripping of

Unit-8 at

RTPS

24-05-2015

at 19:19 hrs

Tripped on Overvoltage.

PendingMEPL vide their mail dated 14.09.2015: informed the

following

1. Tan Delta Testing of winding and DGA of Insulating

Oil for all CTs was carried out and normal.

2. Could not find any problem during internal checks

hence we are in touch with ABB for rectification work.

Will be done by the end of 15th Oct'15

3. End to end testing of Carrier signals was carried out

and found them healthy.

MEPL/

PGCIL(SR-I)/

SEL

45/I/2

(GD)

Complete

outage of

MEPL power

station

20-05-2015 at

20:38 hrs

Y phase CT failure at MEPL led

to tripping of 400kV NPS-

MEPL, 400kV SEPL-MEPL line

and Unit-2 at MEPL. Uni-1 was

not in service at the time of

tripping

1. MEPL to ensure healthiness of all

CT’s by carrying out Tan Delta and DGA

tests wherever necessary.

2. MEPL to take suitable action to

correct the operation of tie-CB Bay

Control Unit that caused LBB/ BBP

operation.

3. PGCIL (SR-1) to carry out end-to-end

PLCC testing in coordination with MEPL

and ensure that carrier-aided protection

on MEPL – NPS line is in healthy

condition.

4. SEL to properly time-coordinate their

Over Current phase and Earth fault relays

in consultation with MEPL.

44/I/3

(GD)

1. All Tripped units, viz.,

Krishnapatinam, MEPL, Raichur,

NCTPS to submit a detailed report

on this event including the remedial


2. KPCL to check the excitation system of

Unit 8 of RTPS, and submit the remedial

measures

taken to PCSC forum.

KPCL/ MEPL/

APGENCO/

TNEB

TANGEDCO vide their mail dated 07.07.2015 informed

that as per the discussion and recommendation of 44th

meeting of PCSC held on 28.05.2015, a time delay of 2

Sec had been introduced for the above tripping for all the

ID fans at NCTPS-II.

MEPL vide their mail dated 14.09.2015 informed that

they have implemented 2 seconds delay for under voltage

tripping of all Drag Chain Feeder Conveyors. And this

has been done for both the Units.

Pending

Yet to be informed Pending47/I/2

(GD)

Complete

outage of

Krishnapatna

m TPS

08-09-2015 at

18:20 hrs

As per FIR submitted, CT

damage observed in Chitoor-

Main bay (404). Main breakers

connected to bus-1 (401, 404,

407, 410) got tripped on

operation of bus bar protection.

Unit-1 tripped on operation of

MFT. Unit-2 was not in service

1. APGENCO to furnish to PCSC forum

(i) A3-size Single Line Diagram of

SDSTPS, and (ii) the sequence of

events with time stamp showing the

protection that opened Tie-CB (405) at

SDSTPS.

2. APGENCO to review STUB/TEED

protection in all dias at SDSTPS and

ensure that they are configured

for instantaneous operation.

3. APGENCO to properly configure the

STATE of the tripping events so that they

get recorded

appropriately like TRIP/ OPERATED in

their corresponding Event Loggers.

4. APGENCO to ensure time sync of all

DR’s and EL’s at SDSTPS.

5. PGCIL (SR-I) to provide line

differential protection for 400 kV NPS

–Nellore-PG lines 1 & 2.

APGENCO/

PGCIL (SR-I)

ANNEXURE-III

Page 23 of 24

47/II/9 Tripping of

400kV

Coastal-

NTPL line

and running

units

at NTPL

03-08-2015 at

15:43 hrs


occurred in 400kV Coastal NTPL

line. Line autoreclosed at NTPL

end and failed to

reclose at Coatal end. Auto

reclose block was persisting due

to PLCC channel fail. Also

running Units-1&2 at NTPL

tripped on operation of GT

differential protection.

1. NTPL to ensure (i) proper DATE

settings, and (ii) time-sync with GPS for

DR and EL at NTPL.

2. CEPL to furnish remedial measures

taken regarding PLCC channel failure.

NTPL/ CEPL Yet to be informed Pending

PendingYet to be informedKPTCL/

KPCL/ NPCIL

47/II/7 Tripping of

220kV Kadra-

Karwar line-

1&2 and

220kV

Kaiga-Kadra

line

31-07-2015 at

11:44 hrs

220kV KAdra-Karwar lines-1&2

tripped

on earth fault in B-phase in zone-

2.

Kaiga-Kadra line tripped at

Kaiga end

only on operation of directional

eath

fault protection.

1. KPTCL/ KPCL to see the possibility of

implementing Weak Infeed logic with

Echo feature enabled by Under

Voltage (27) element on Kadra-Karwar

lines 1 &2, and implement the same if

feasible.

2. NPCIL to time-coordinate Kaiga’s

DEFR settings with (i) Zone-2 settings at

Kaiga, and (ii) primary protections of the

lines emanating from Kadra and

Kodasalli.

3. KPCL to ensure time-sync of EL’s, and

healthiness of the Fault Locators at

Kadra.

ANNEXURE-III

Page 24 of 24

Sl.No. Element NameOutage

date/time

Revival

date/time

Reason for

OutageSender/ Receiver

Remedial Measures/ Actions

taken

1220 kV AMBEWADI -

PONDA 123-06-2015/11:39:00

EARTH FAULT

RELAY

OPERATED

KPTCL/ GOA To-be-discussed

2

400 Kv

KRISHNAPATNAM -

NELLORE

20-07-2015/11:27:00 20-07-2015/12:00:00

BUS -1 TRIPPED :

REASON

AWAITED

APGENCO/

APTRANSCO/ PGCIL

(SR-I)

APGENCO: BUS-1 was tripped

at Power Grid Sub-

Station(PGCIL), Nellore during

the operation of the Isolators,

which is not pertaining to

APGENCO.

APTRANSCO: Line tripped at

Krishnapatnam end only.Line is

in service from Nellore-AP.

PGCIL (SR-I):

3400 kV VIJAYAWADA -

VTPS IV 126-07-2015/00:05:00

TRIPPED DUE

TO B-PHASE CT

BLAST

PGCIL(SR-I)/

APGENCO

APGENCO: This issue pertains

to PGCIL.

PGCIL(SR-I):

4GOOTY-

NELAMANGALA02-08-2015/09:18:00 02-08-2015/10:57:00

TRIPPED AT

SHOLAPUR END

ONLY.

KPTCL To-be-discussed

5400/220 kV ICT-1 AT

KAIGA04-08-2015/21:56:00

Y-PH LA

FAILUREKAPS To-be-discussed

6

220 kV

YERANDAHALLY -

HOSUR

17-08-2015/12:50:00 B-N FAULT KPTCL / TNEB

KPTCL: Transient fault. Stood

OK after test charging.

TANTRANSCO: Temporary

Fault and AR lockout at Hosur

end. The Feeder was normalized

at 13:14 Hrs.

Pending Remedial Measures/ Actions taken

for the Critical Tripping Incidents (as on 06.10.2015)

Annexure-IV

Page 1 of 10

7220 kV EDAMON -

EDAPPON18-08-2015/16:32:00 18-08-2015/17:01:00

TRIPPED ON Y-

PH FAULTKSEB

PGCIL (SR-II): Portion of the

line in which fault occured

owned and maintained by M/s

KSEB. May be clarified from M/s

KSEB.

KSEB:

8220 kV KUNDRA -

KAYAMKULAM18-08-2015/16:32:00

TRIPPED ON Y-

PH FAULTKSEB / NTPC




KSEB. May be clarified from M/s

KSEB.

KSEB:

9400 kV GUTTUR -

HIRIYUR 123-08-2015/10:01:00 23-08-2015/13:12:00

BUS BAR

CONNECTIONKPTCL/ PGCIL(SR-II) To-be-discussed

10400 kV NEYVELI TS 2 -

PUGALUR25-08-2015/16:09:00 25-08-2015/17:50:00

TRIPPED DUE

TO ARCHING ON

BUS-1

ISOLATOR AT

NLC

NLC/ PGCIL(SR-II)

PGCIL (SR-II): Tripped on

receipt of DT from TS2 end, (

Understood that due to isolator

problem at TS2 end.)

NLC:

11400 kV SRISAILAM-

MAMIDIPALLI 226-08-2015/15:40:00 26-08-2015/18:40:00 JUMPER CUT

TSGENCO/

TSTRANSCOTo-be-discussed

12400 kV KAIGA - GUTTUR

228-08-2015/15:17:00 28-08-2015/16:18:00 B - N FAULT KAPS/ KPTCL




KPTCL. May be clarified from

M/s KPTCL.

KPTCL:

13400 kV KHAMMAM -

KALPAKKA 103-09-2015/02:26:00 R-B FAULT

PGCIL (SR-I)/

APTRANSCOTo-be-discussed

Annexure-IV

Page 2 of 10

14 400 Kv HASSAN - UPCL 1 03-09-2015/11:23:00 03-09-2015/11:55:00 R-N FAULT PGCIL (SR-II)/ UPCL

PGCIL (SR-II): Line owned and

maintained by M/s KPTCL. May

be clarified from M/s KPTCL.

KPTCL:

15 400 Kv HASSAN - UPCL 1 03-09-2015/12:15:00 03-09-2015/15:19:00 R-N FAULT PGCIL (SR-II)/ UPCL




KPTCL:

16220 kV SABARGIRI -

THENI04-09-2015/13:23:00 04-09-2015/13:56:00 Y -N FAULT

KSEB/

TANTRANSCO

TANTRANSCO: Temporary

fault. AR lockout at Theni end.

Feeder normalised at 13:56 hrs.

KSEB:

17400 kV GAJWEL -

HYDERABAD05-09-2015/08:09:00 05-09-2015/08:44:00

TRIPPED DUE

TO MAL

OPERATION OF

REACTOR WTI

AT HYD

TSTRANSCO/

PGCIL(SR-I)To-be-discussed

18400 Kv VIJAYAWADA -

NELLORE - AP - 305-09-2015/14:43:00 05-09-2015/15:59:00 B - N FAULT

PGCIl (SR-I)/


19220 kV KANIAMPET -

KADAKOLA05-09-2015/12:05:00 05-09-2015/12:25:00

TRIPPED ON R-

PH FAULTKSEB/ KPTCL



KSEB:

20400 Kv VIJAYAWADA -

NELLORE - AP -06-09-2015/15:01:00 06-09-2015/15:07:00 B-N FAULT

PGCIl (SR-I)/


21400 kV TRIVENDRUM -

TIRUNELVELI 207-09-2015/16:50:00 07-09-2015/17:09:00

MALOPERATIO

N OF DTPGCIL (SR-II)

PGCIL (SR-II): PLCC mal-

operation at TVM end. Rectified

the faulty card.

Annexure-IV

Page 3 of 10

22220 Kv REGULAPADU-

ALIPUR LINE07-09-2015/03:23:00 07-09-2015/04:32:00 EFR ACTED

APTRANSCO/

KPTCL



APTRANSCO:

23400 kV RAMAGUNDAM -

CHANDRAPUR 207-09-2015/22:20:00

DISTANCE

PROTECTION

ACTED

NTPC/ PGCIL (WR-I) To-be-discussed

24400 kV TRIVENDRUM -

TIRUNELVELI 207-09-2015/16:36:00 07-09-2015/16:47:00

MALOPERATIO

N OF DTPGCIL (SR-II)

PGCIL (SR-II): PLCC mal-

operation at TVM end.

25 400 Kv BTPS - YTPS 08-09-2015/15:58:00 08-09-2015/17:27:00 R-N FAULT KPCL To-be-discussed

26400 kV KHAMMAM -

KALPAKKA 208-09-2015/15:37:00 08-09-2015/15:54:00

TRIPPED AT

KLPA END

ONLY

PGCIL (SR-I)/


27 400 Kv RAICHUR - YTPS 08-09-2015/15:58:00 08-09-2015/17:22:00 R-N FAULT KPCL To-be-discussed

28

400 Kv

KRISHNAPATNAM -

CHITTOOR -2

09-09-2015/09:04:00 09-09-2015/09:52:00 DT RECEIVEDAPGECNO/


29400 Kv VTPS -

MALKARAM 110-09-2015/11:27:00 10-09-2015/11:37:00

TRIPPED AT

MLKRM END

ONLY

APGENCO/


30220 KV BHAVINI -

SIRUSERI 210-09-2015/00:48:00 10-09-2015/01:34:00 R-N FAULT

NPCIL/

TANTRANSCOTo-be-discussed


110-09-2015/15:21:00 10-09-2015/19:16:00

TRIPPED ON B-

PH FAULTKAPS/ KPTCL





M/s KPTCL.

KPTCL:

32220 kV SEDAM -

TANDUR10-09-2015/16:35:00 10-09-2015/19:15:00

TRIPPED DUE

TO LOSS OF

INFEED AT

SEDAM

KPTCL/


Annexure-IV

Page 4 of 10

33400 kV RAMAGUNDAM -

HYDERABAD 411-09-2015/22:26:00 11-09-2015/23:02:00

PLCC

MALOPERATIO

N

NTPC/ PGCIL (SR-I) To-be-discussed


112-09-2015/11:07:00 12-09-2015/11:55:00

TRRIPPED ON B-

PH FAULTKAPS/ KPTCL





M/s KPTCL.

KPTCL:

35 400 Kv HASSAN - UPCL 1 12-09-2015/13:48:00 12-09-2015/14:48:00 B - N FAULT PGCIL (SR-II)/ UPCL




KPTCL:

36400 kV TALAGUPPA -

NEELAMANGALA14-09-2015/11:21:00

TRIPPED ON Y-N

FAULTKPTCL To-be-discussed

37400 kV GOOTY -

NELAMANGALA15-09-2015/23:55:00 16-09-2015/00:13:00

TRIPPED ON R-

PH FAULTPGCIL (SR-I)/ KPTCL To-be-discussed

38400 Kv IL&FS -

NAGAPATTANAM-115-09-2015/10:51:00 15-09-2015/13:39:00 Y-N FAULT IL&FS/ PGCIL (SR-II) To-be-discussed

39400/220 kV ICT-1 AT

CHITTOOR15-09-2015/16:55:00 15-09-2015/19:51:00

WHILE CLOSING

BUS COUPLER

AUTO TRIP

COMMAND

SENT TO ICT'S

APTRANSCO To-be-discussed

40400/220 kV ICT-2 AT

CHITTOOR15-09-2015/16:55:00 15-09-2015/19:58:00

WHILE CLOSING

BUS COUPLER

AUTO TRIP

COMMAND

SENT TO ICT'S


Annexure-IV

Page 5 of 10

41400 kV GAJWEL -

HYDERABAD17-09-2015/01:45:00

TRIPPED ON Y-N

FAULT

TSTRANSCO/ PGCIL

(SR-I)To-be-discussed


117-09-2015/14:55:00

TRIPPED ON

DISTANCE

PROTECTION

KAPS/ KPTCL To-be-discussed

43400 KV ALAMATHI -

THIRUVALLAM-117-09-2015/16:45:00

TRIPPED ON

LINE TO

GROUND FAULT

TANTRANSCO To-be-discussed

44400 kV GUTTUR -

HIRIYUR 218-09-2015/10:33:00 18-09-2015/11:01:00

D/T RECEIVED

FROM HIRIYUR

END

KPTCL/ PGCIL (SR-

II)To-be-discussed


119-09-2015/13:55:00 19-09-2015/14:59:00

TRIPPED ON B-

PH FAULTKAPS/ KPTCL To-be-discussed

46400 kV GUTTUR -

HIRIYUR 219-09-2015/09:40:00 19-09-2015/09:55:00

TRIPPED AT

GUTTUR END

ONLY

KPTCL/ PGCIL (SR-

II)To-be-discussed

47400 Kv GAJWEL -

SHANKARPALLY 220-09-2015/02:24:00 20-09-2015/04:27:00 LINE FAULT TSTRANSCO To-be-discussed


121-09-2015/11:26:00 21-09-2015/12:10:00

TRIPPED ON B-N

FAULTKAPS/ KPTCL To-be-discussed

49220 Kv CHIKKODI -

MUDUSHINGI21-09-2015/10:58:00 21-09-2015/17:35:00

TRIPPED ON PH-

PH FAULTKPTCL To-be-discussed


VEMAGIRI 121-09-2015/17:20:00 21-09-2015/17:44:00

TRIPPED ON

PLCC TESTING

PGCIL (SR-I)/


51400 kV GUTTUR -

NARENDRA 222-09-2015/13:53:00 22-09-2015/14:19:00

DT RECIEVED

AT GUTTUR

END

KPTCL/ PGCIL (SR-

II)To-be-discussed

52400/230 Kv ICT-1 AT

ARASUR22-09-2015/15:01:00 22-09-2015/17:24:00

TRIPPED ON

OVER LOADINGPGCIL (SR-II) To-be-discussed

Annexure-IV

Page 6 of 10

53400/230 Kv ICT-2 AT

ARASUR22-09-2015/15:01:00 22-09-2015/16:52:00

TRIPPED ON

OVER LOADINGPGCIL (SR-II) To-be-discussed


KADAKOLA22-09-2015/22:30:00 22-09-2015/22:51:00

TRIPPED ON

DISTANCE

PROTECTION

KSEB/ KPTCL To-be-discussed

55400 kV GUTTUR -

HIRIYUR 123-09-2015/10:32:00 23-09-2015/12:46:00 DT RECEIVED

KPTCL/ PGCIL (SR-

II)To-be-discussed

56400 kV GUTTUR -

HIRIYUR 123-09-2015/15:45:00 23-09-2015/16:24:00

DT RECEIVED

AT GUTTUR

END

KPTCL/ PGCIL (SR-

II)To-be-discussed


KADAKOLA23-09-2015/12:06:00 23-09-2015/12:36:00 B-N FAULT KSEB/ KPTCL To-be-discussed

58400/220 kV ICT-2 AT

GUTTUR23-09-2015/10:48:00 23-09-2015/13:27:00

RELAY

MALOPERATIO

N

KPTCL To-be-discussed


KADAKOLA24-09-2015/04:20:00

TRIPPED DUE

TO BREAKER

PROBLEM-POLE

DISCREPENCY

KSEB/ KPTCL To-be-discussed

60400 Kv NELLORE -

THIRUVALLAM 124-09-2015/10:52:00 24-09-2015/11:49:00

DT RECEIVED

AT THVLM

PGCIL (SR-I)/ PGCIL

(SR-II)To-be-discussed

61400/220 kV ICT-2 AT

VISAKHAPATNAM24-09-2015/18:09:00 24-09-2015/18:44:00

220 KV SIDE

BUS BAR

PROTECTION

OPERATED

PGCIL (SR-I) To-be-discussed

62220 kV AMBEWADI -

PONDA 124-09-2015/13:20:00 24-09-2015/17:25:00 B-N FAULT KPTCL/ GOA To-be-discussed

63400/220 Kv ICT-2 AT

SATTENAPLLI24-09-2015/08:33:00 24-09-2015/11:26:00

RELAY

MALOPERATIO

N


64400 kV GAJWEL -

HYDERABAD25-09-2015/23:18:00 25-09-2015/23:34:00

TRIPPED ON B-N

FAULT

TSTRANSCO/ PGCIL

(SR-I)To-be-discussed

Annexure-IV

Page 7 of 10


NELLORE 125-09-2015/10:10:00 25-09-2015/10:55:00 Y-N FAULT PGCIL (SR-I) To-be-discussed

66

400 Kv

KRISHNAPATNAM -

CHITTOOR -1

25-09-2015/21:34:00 25-09-2015/22:09:00TRIPPED ON R-N

FAULT

APGENCO/


67400 Kv NAGAPATNAM-

TIRCHY-126-09-2015/15:14:00 26-09-2015/15:30:00

TRIPPED ON Y-

PH FAULTPGCIL (SR-II) To-be-discussed

68400 Kv SATTENAPALLI -

SRISAILAM 126-09-2015/16:45:00

TRIPPED ON R-

PH FAULT

APTRANSCO/

TSGENCOTo-be-discussed

69400 Kv KAYATHAR -

KARAIKUDI 226-09-2015/15:16:00 26-09-2015/17:54:00

TRIPPED ON R-

PH FAULT

TANTRANSCO/

PGCIL (SR-II)To-be-discussed

70400 Kv KAYATHAR -

KARAIKUDI 126-09-2015/17:05:00 26-09-2015/17:46:00

TRIPPED ON R-

PH FAULT

TANTRANSCO/


71220 kV AMBEWADI -

PONDA 127-09-2015/15:53:00 27-09-2015/16:38:00

DUE TO BUS

DEAD AT

AMBAWADI

STATION


72220 kV AMBEWADI -

PONDA 227-09-2015/15:53:00 27-09-2015/18:43:00

DUE TO BUS

DEAD AT

AMBAWADI

STATION


73400 KV ALAMATHI -

THIRUVALLAM-127-09-2015/11:32:00 27-09-2015/16:53:00

TRIPPED DUE

INSULATOR

DECAPPING

TANTRANSCO To-be-discussed


127-09-2015/14:52:00

TRIPPED ON B-



228-09-2015/16:32:00 28-09-2015/17:18:00 B - N FAULT KAPS/ KPTCL To-be-discussed

76400 Kv KAYATHAR -

KARAIKUDI 228-09-2015/15:42:00 28-09-2015/16:24:00 Y- N FAULT

TANTRANSCO/


Annexure-IV

Page 8 of 10

77400 kV WARANGAL -

KHAMMAM29-09-2015/17:06:00 29-09-2015/18:27:00

PLCC

MALOPERATIO

N

PGCIL (SR-I) To-be-discussed

78765 KV KURNOOL -

THIRUVALLM 229-09-2015/12:57:00 29-09-2015/15:39:00

REF

PROTECTION

ACTED

PGCIL (SR-I)/ PGCIL

(SR-II)To-be-discussed

79400 kV NEYVELI TS 2

(EXP) - PUGALUR29-09-2015/16:42:00 29-09-2015/17:24:00 R - N FAULT NLC/ PGCIL (SR-II) To-be-discussed


129-09-2015/12:02:00 29-09-2015/12:45:00

TRIPPED ON B-


81220 kV AMBEWADI -

PONDA 230-09-2015/10:41:00 30-09-2015/11:03:00

BUS DEAD AT

AMBEWADI

END


82400 kV GUTTUR -

HIRIYUR 230-09-2015/10:12:00 30-09-2015/11:56:00

PLCC

MALOPERATIO

N

KPTCL/ PGCIL (SR-

II)To-be-discussed

83220 kV AMBEWADI -

PONDA 130-09-2015/10:41:00 30-09-2015/11:03:00

BUS DEAD AT

AMBEWADI

END


84220 Kv CHIKKODI -

MUDUSHINGI01-10-2015/20:10:00 Y-N FAULT KPTCL To-be-discussed

85220 kV SABARGIRI -

THENI02-10-2015/16:31:00 02-10-2015/16:59:00

DISTANCE

PROTECTION

KSEB/


86400 KV ALAMATHI -

THIRUVALLAM-102-10-2015/18:36:00 R-N FAULT TANTRANSCO To-be-discussed

87400 kV WARANGAL -

BOOPALPPALLI 104-10-2015/14:42:00 04-10-2015/15:52:00

TRIPPED ON B-

PH FAULT

PGCIL (SR-I)/



204-10-2015/14:27:00

TRIPPED ON B-


89400 Kv PONDY-

SVCHATRAM04-10-2015/22:55:00 Y-N FAULT PGCIL (SR-II) To-be-discussed

Annexure-IV

Page 9 of 10

90 400 Kv NCTPS - SVCTM-I 05-10-2015/14:31:00 05-10-2015/15:44:00TRIPPED ON R-

PH FAULT

TANGEDCO/


91400 Kv SATTENAPALLI -

SRISAILAM 205-10-2015/16:24:00 B-PH FAULT

APTRANSCO/

TSGENCOTo-be-discussed

Annexure-IV

Page 10 of 10

S.

No

Name of

Substation Details of work Status of Implementation of Protection Audit Recommendations Remarks

1 220 KV- Dr.

NTTPS, Stage-I,

220 KV Switch

yard. VTS

Only 220 V DC Source with one battery

set is available for entire 220 kV SS.It is

recommended to have redundant DC

source.

Redundant 220 kV DC supply is available from station Battery Bank. Pending

7 230 kV Basin

Bridge Substation No Earth fault protection on HV & LV

side of transformer. Same to be providedE/F settings for AUTOs not being adopted in TANTRANSCO. Pending

8 230 kV Ennore

(ETPS) Earth fault relay to be provided on HV &

LV sides of Auto t/p # 1, 2 and TO # 3 t/f.

Over fluxing relayto be provided.

E/F settings for AUTOs not being adopted in Tantransco. Pending

9 230 kV Korattur

Substation No E/L relay protection on ATR 1, 2 & 3

HVs. Same to be providedE/F settings for AUTOs not being adopted in Tantransco. Pending

10 230 kV Mylapore

Substation No Earth fault protection on HV & LV

side. Same to be reviewed and providedE/F settings for AUTOs not being adopted in Tantransco. Pending

11 230 kV Tondiarpet

Substation 100 MVA, 230/110 kV transformer # 1

&2, back up O/C relays setting need

review. Earth fault relays to be provided

on both HV & LV side of ICT's

Uniform setting adopted for O/C. E/F settings for AUTOs not being adopted in

TantranscoPending

Review of implementation of certain Protection Audit Recommendations of

SR-Constituents (PCSC-47)

APGENCO (THERMAL) [Phase-II]

TANGEDCO (Phase-I)

TANTRANSCO (Phase-I)

Annexure-V

1

Additional Agenda for 48th PCSC meeting Page 1

SOUTHERN REGIONAL POWER COMMITTEE

BENGALURU

Additional Agenda for the 48th

meeting of Protection Coordination Sub-Committee (PCSC-

48) of SRPC to be held on 29.10.2015

1. Non- furnishing of Tripping Details

The members were intimated about non- furnishing of tripping details for the grid incidents that occurred

during the period 1st - 15

th October, 2015 vide SRPC letter dated 20.10.2015 (Annexure-VI). The issue

would be discussed in the meeting.

2. Review of implementation of certain Protection Audit Recommendations of APTRANSCO

APTRANSCO vide their letter dated 01-10-2015, requested to drop certain protection audit

recommendations of their 220 kV Bommur and 400 kV Kurnool Substations. In this regard, PCSC forum may appropriately review the recommendations given at Annexure-VII.

3. Provision of Auto-Reclosure on lines (400 kV & 220 kV) emanating from Kaiga NPP

A special meeting was held at SRPC, Bengaluru on 20-10-2015 to discuss grid related issues with

representatives of NPCIL, CTU and APTRANSCO as a follow-up to 28th SRPC meeting held on

10-10-2015. During the deliberations relating to providing Auto-Reclosure on lines (400 kV & 220 kV)

emanating from Kaiga NPP, the following were noted:

As regards A/R provision on

220 kV lines emanating from Kaiga (U1 & U2), their representative informed

that they are ready to provide A/R from Kaiga end, however, readiness from

the other ends, viz., Kadra and Kodasalli needed to be found out. Further,

closing of Kodasalli – Nagjheri line from Nagjheri end also needs to be

considered for better reliability.

400kV Kaiga- Guttur D/C, their representative informed that even though they

are ready to provide A/R from Kaiga end, the same cannot be put into service

until the trippings on these lines are brought down to minimum by KPTCL. The

KPTCL management has been apprised of the severity of the issue and

affirmative action from them in this regard is still awaited.

After deliberations, it was decided that the issue would be discussed in detail in the

forthcoming Protection Co-ordination Sub-Committee meeting.

Accordingly, it is proposed to further deliberate on the above issue.

4. Meeting of Standing Committee of Experts to investigate the failure of equipment at 220 kV and

above substations

It is intimated that the meeting of Standing Committee of Experts to investigate the failure of equipment

at 220 kV and above substations would be held on 4th November, 2015 at 2:30 PM in Conference Room, 6

th

Floor (North), CEA, Sewa Bhawan, R.K Puram, New Delhi (Annexure-VIII). Members may kindly note.

*****

Annexure-VI

Page 1 of 10

Annexure-VI

Page 2 of 10

Annexure-VI

Page 3 of 10

Annexure-VI

Page 4 of 10

Annexure-VI

Page 5 of 10

Annexure-VI

Page 6 of 10

Annexure-VI

Page 7 of 10

Annexure-VI

Page 8 of 10

Annexure-VI

Page 9 of 10

Annexure-VI

Page 10 of 10

Review of implementation of certain Protection Audit Recommendations

of APTRANSCO

Name of

the SS

Protection audit observations Remarks

400KV

Nannur

item 5, of

Phase I.

400KV Kurnool (Nunnur) Gooty

feeder main I protection on SEL-

421 the “out of step

tripping/blocking”. Settings are

different from approved settings.

This is to be reviewed.

This line pertaining to PGCIL and hence

may be dropped from the list.

220KV

Bommur

item 3 of

phase1.

REF is not used in

APTRANSCO for 220KV

substations

At present differential protection is used

as a main protection and O/C & E/F

protection as a back up protection for the

PTRs at 220KV level. REF protection is

being used as an additional protection by

using bushing CTs of PTR at 400KV

level. For providing REF protection for

the existing PTRs at 220KV Bommur SS

transformer neutral side CTs are to be

provided. And also spare core is not

available on the phase side CTs for REF

protection. So the CTs on Phase side

also need to be replaced. There will be

clearance problem and constraint of place

in the event of erection of neutral side

CTs. This will have cumulative effect in

the yard. Hence the proposal for

providing REF protection for the existing

transformers at 220KV level may be

dropped.

ANNEXURE-VII

ANNEXURE-VIII

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