पता - SRPC, Bengaluru · 2017. 5. 25. · Agenda for the 64th Meeting of PCSC scheduled to be held on 25th May, 2017 Page 1 SOUTHERN REGIONAL POWER COMMITTEE. BENGALURU. Agenda

पता सू�च / Address List

1. मुख ् य अ भयंता (एचपीसी व जल पKरयोजना) एपीजेनको, हैदराबाद/ Chief Engineer (Generation I), APGENCO, Hyderabad

2. मुख ् य अ भयंता (पKरयोजना), एपीजेनको, हैदराबाद/ Chief Engineer (Projects), APGENCO, Hyderabad

3. मुख ् य अ भयंता (�व�युत �णाल�), एपीMान ् स ् को, हैदराबाद/ Chief Engineer (Power System), APTRANSCO,

Hyderabad.

4. मुख ् य अ भयंता ( उत ् पादन), ट�एसजेनको, हैदराबाद/ Chief Engineer (Generation), TSGENCO, Hyderabad

5. मुख ् य अ भयंता (पKरयोजना), ट�एसजेनको, हैदराबाद/ Chief Engineer (Projects), TSGENCO, Hyderabad

6. मुख ् य अ भयंता (�व�युत �णाल�), ट�एसMान ् स ् को, हैदराबाद/ Chief Engineer (Power System), TSTRANSCO,

Hyderabad

7. मुख ् य अ भयंता (इले.Oडज़ाईन), केपीसीएल, ब�गलूर/ Chief Engineer (Ele. Designs), KPCL, Bangalore

8. मुख ् य अ भयंता ( आर ट�), केपीट�सीएल, ब�गलूर/ Chief Engineer (RT), KPTCL, Bangalore

9. मुख ् य अ भयंता, एसएलडीसी, केपीट�सीएल, ब�गलूर/ Chief Engineer, SLDC, KPTCL, Bangalore

10. मुख ् य अ भयंता (एम.ट�.एस), टैनजोडको, चैन ् नै/ Chief Engineer (MTS), TANGEDCO, Chennai

(Fax No: 044 – 28585804)

11. मुख ् य अ भयंता (जल �व�युत), टैनजोडको, चैन ् नै/ Chief Engineer (Hydro),TANGEDCO, Chennai

(Fax No: 044 – 28553356)

12. मुख ् य अ भयंता (संर�ण एव ं संचार), ट� एन ई बी, चने ् नै/ Chief Engineer (Protection & Communication),

TANTRANSCO, Chennai

13. मुख ् य अ भयंता (पारेषण), �णाल� �चालन, एचएमट� कालोनी, केएसईबी, कलमस ् सेर�-683503/ Chief Engineer

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

14. अधी�क अ भयंता-।, �व�युत �वभाग, 137, एनएससी बोस साल,ै पुदचुरे�- 605001/ Superintending

Engineer –I, Electricity Department, 137, NSC Bose Salai, Puducherry – 605001 (Fax No: 0413-

2331556)

15. जी एम ( �चा व अनु) द�-े।, पावर�Uड, सकंदराबाद/ GM (O&M), SR-I, PGCIL, Secunderabad

16. जी एम ( �चा व अनु) द�-े।।, पावर�Uड, ब�गलूर/ GM (O&M), SR-II, PGCIL, Bengaluru

17. महा�बंधक (ओ एस), एनट�पीसी, द��ण �े�ीय मुख ् यालय, सकंदराबाद/ General Manager (OS), NTPC SRHQ,

Secunderabad

18. मुख ्य महा�बंधक ,ट�पीएस-। �वस ्तार ,एनएलसी ,नैवेल� - 607807/ Chief General Manager, TPS-I Expn. NLC,

Neyveli-607807 (Fax No: 04142 – 265303)

19. मुख ् य अ भयंता (पारेषण) एनपीसीआईएल, मुंबई/ Chief Engineer (Transmission), NPCIL, Mumbai.

20. क� � "नदेशक, केजीएस, कैगा, कना#टक/ Station Director, KGS, Kaiga, Karnataka

21. क� � "नदेशक, एमएपीएस, कल ् पक् कम/ Station Director, MAPS, Kalpakkam

22. क� � "नदेशक, केकेएनपीपी, "तXनल ् वेल� िजला, त मलनाडु- 627106/ Station Director, KKNPP, Thirunelveli

Dist, TamilNadu-627106

23. Yी पी पी जेस ् ट�न, एजीएम (ईएम), एनट�ईसीएल, चने ् नै-103/ Shri P.P. Gestine, AGM (EM), NTECL,

Chennai-103.

24. Yी एम �भाकर, महा�बंधक (� व अ), एनट�पीएल, हाब#र ए� टेट, तूतुकुडी- 628004/ Sh. M. Prabhakar,

GM (O&M), NTPL, Harbour Estate, Tuticorin – 628004 (Fax No: 0461 – 2352842)

25. Yी सूय# �काश, उपा] य� (�चालन व अनुर�ण), जेएसड^ _ यू एनज` ल. तोरणग_ लु, ब_ लार� – 583275/

Shri Surya Prakash, Vice President (Operations & Maintenance), M/s JSW Energy Ltd, Toranagallu,

Bellary-583275

26. Yी शांताराम प,ै सह उपा] य� (�व�युत एवं पKरयोजना), जेएसड^ _ यू एनज` ल. तोरणग_ लु, ब_ लार� –

583275/ Shri Shantharam Pai, Associate Vice President (Electrical & Projects), M/s JSW Energy

Ltd, Toranagallu, Bellary-583275

27. Yी आर वी भbए, उपाध ् य� ( �चालन) यूपीसीएल, ब�गलूर/ Shri R.V.Bhat, Vice President (Operations), UPCL,

Bangalore

28. सह उपा] य� ( संर�ण व मीटKरगं), अदानी पावर ल, 8-ए, 'संभव' जज भवन के सामने, बोदकदेव,

अहमदाबाद- 380015, गुजरात / Associate Vice President (Protection & Metering), Adani Power Ltd,

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

29. Yी dब�युत च$बत` (�धान �व�युत एवं सी आई अनुर�ण) ट�पीसीआईएल, e यानपुरम / नेलf तूX Uाम, मुतुकूर

मंडल, एसपीएसआर ने_ लूर- 524344/ Sh. Bidyut Chakraborty (Head Electrical and C&I Maintenance),

TPCIL, Pyanampuram/ Nelaturu Village, Muthukur Mandal, SPSR Nellore – 524344 (Fax No: 0861

– 305 2304)

30. Yी आर एस कुमार� वामी, सलाहार(�व�युत), सीईपीएल, मेलमरडूर Uाम, ओ+b�पदरम ता_ लूक, तूतुकुडी-

628105, त मलनाडु/ Sh. R.S. Kumaraswamy, Advisor (Electrical), CEPL, Melamarudur Village,

Ottipidaram Taluk, Tuticorin – 628 105, Tamil Nadu (Fax No: 0461 – 2614297)

31. Yी ;कशोर आक# ट, वKर. उपा] य� (� व अ), आईएल व एफएस, ट�पीसीएल, सी पुदपेुbै डाक, परनगीपेbै,

भुवन�गKर ता_ लूक, कुडलूर िजला, त मलनाडु- 608502/ Sh. Kishore Arcot, Sr. Vice President (O&M),

IL&FS Tamilnadu Power Company Ltd., C.Pudhupettai (post), Parnagipettai, Bhuvanagiri Taluk,

Cuddalore Dist, Tamilnadu – 608502 (Fax No: 0414-4252991)

*****

Agenda for the 64

th Meeting of PCSC scheduled to be held on 25

th May, 2017 Page 1

SOUTHERN REGIONAL POWER COMMITTEE BENGALURU

Agenda for the 64th Meeting of Protection Coordination Sub-Committee of SRPC to be held on 25th May, 2017 (Thursday)

1. Introduction

2. Confirmation of Minutes of last PCSC meeting

Confirmation of minutes of 63rd Protection Coordination Sub-Committee meeting held on 26.04.2017.

3. Grid Occurrences

3.1 Grid Disturbances (GD), Grid Incidences (GI), and trippings due to failure of Auto-reclosing (A/R), and mal-operation of PLCC equipment that occurred during the period March-April, 2017 given at Annexure-I would be discussed in the PCSC meeting.

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

Constituents are requested to bring/ furnish full particulars of the tripping events pertaining to their system.

3.2 In compliance of Regulations 5.2 (r) of IEGC, the Constituents are required to

furnish the following information in respect of Grid Occurrences within 24 hrs of occurrence of the same to SRLDC/ SRPC: (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 (FIR/DR/EL/TR) for the period 01.04.2017 – 30.04.2017 had been brought to Constituents’ notice vide letters (i) No. SRPC/ SE-III/ PCSC-63/ 2017/2107 - 08 dated 18.04.2017 and (ii) No. SRLDC/ SRC&S/2017/ dated 12.04.2017. Non-compliance in this regard 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 (up to 62nd PCSC meeting) given at Annexure-II may please be sent latest by 22.04.2017.

Agenda for the 64th

Meeting of PCSC scheduled to be held on 25th

May, 2017 Page 2

4.2 Remedial measures for "Transmission Elements under Forced Outage"

The Constituents are requested to furnish the remedial measures/ action taken by them for the tripping events as circulated vide our emails. (Annexure-III)

The tripping 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 have been requested to submit the certificate on healthiness of batteries on monthly basis (i.e. status for a month shall be sent by the 7th day of the following month) to SRPC Secretariat.

The sought status for the month of April, 2017 is awaited from the following SR-Constituents:

APGENCO (Thermal), KPCL, KPTCL, TANTRANSCO, PED, PGCIL (SR-II) & JSWEL

5. Status of Implementation of Line Differential Protection (LDP) in Nellore and

Simhadiri complexes

Line differential protection has been recommended to be implemented for all 400 kV lines at Nellore and Simhadri Complexes vide various PCSC/ PSAG/Special meetings.

Complex Constituents responsible for implementation

Nellore PGCIL (SR-I), APGENCO, APTRANSCO, TPCIL, MEPL, SEL and NCC

Simhadri PGCIL (SR-I), NTPC, APTRANSCO and HNPCL

All above Constituents are requested to kindly present the status of implementation of LDP and concrete action taken so far in this regard.

6. Review of Implementation of Protection Audit Recommendations (PAR) of

SR-Constituents Hon’ble CERC vide their Order dated 15.12.2016 issued in respect of KSEB petition (88/MP/2016) and KPTCL petition (135/MP/2016), has directed SRPC to monitor the status of completion of PAR regularly in PCSC meetings and submit bi-monthly report to the Commission confirming the completion of Phase-I and Phase-II of PAR of the Constituents of Southern Region.

http://srldc.in/%20DailyReport.aspx

Agenda for the 64th

Meeting of PCSC scheduled to be held on 25th

May, 2017 Page 3

In this regard, the present status of PAR implementation by SR-Constituents as maintained by SRPC is enclosed at Annexure-IV. All SR-Constituents are requested to kindly update the latest status of implementation of their respective PAR, and furnish the same in soft copy (Excel format) latest by 08.06.2017 to SRPC Secretariat ([email protected]).

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

8. 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.

9. Date of next PCSC meeting

The 64th PCSC meeting would be conducted on 29.06.2017 (Thursday) from

10:30 hrs in the Conference Hall of SRPC Secretariat, Bengaluru.

*****

Grid Occurrences - 64

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.

I. Details of Grid Disturbances:

Sl. No.

Details of Event Date & Time Reason Remarks Category

1 Complete outage of North Chennai TPS STG-2

24-Apr-17 at 21:02hrs

Tripping of evacuating lines due to fault led to tripping of Unit

Gen Loss: 435 MW

GD-1


25-Apr-17 at 18:27hrs

Tripping of evacuating lines due to fault led to tripping of Unit

Gen Loss: 435 MW

GD-1


26-Mar-17 at 21:09hrs

Tripping of evacuating lines due to fault led to tripping of unit at NCTPS Stg-2

Gen Loss: 167 MW

GD-1


26-Mar-17 at 23:14hrs

Tripping of evacuating lines due to fault led to tripping of unit at NCTPS Stg-1

Gen Loss: 250 MW

GD-1

II. Details of Grid Incidents:

Sl. No. Details of Event Date & Time Reason Category

1

Tripping of 400/220KV 315MVA ICT-1and 230kV elements at 400kV Vemagiri substation of APTRANSCO

09-04-2017 at 12:31 hrs

Suspected mal-operation of Busbar protection had caused tripping of 220kV Bus-1 at Vemagiri.

GI-2

2

Tripping of 400/220kV ICT-2&3 at 400kV Ghani substation of APTRANSCO

10-04-2017 at 17:29 hrs

ICT-2&3 got tripped due to operation of 220KV Bus-2 busbar protection at 400/220KV Ghani substation.

GI-2

3 Tripping of 400/220kV Dichipally ICT-3

14-04-2017 at 13:19 hrs

ICT-3 at dichipally tripped on operation three phase trip relays i.e. 86A and 86B relays

GI-2

Annexure-I

Page 1 of 4

4 Tripping of 400kV lines and ICT’s at Guttur substation of KPTCL

17-04-2017 at 00:40 hrs

Lightening arrestor flashover had occurred in 400kV Guttur-Narendra line-1 at Guttur end

GI-2

5 Tripping of 765/400 kV ICT-1 at 765kV Vemagiri(PG)

18-04-2017 at 15:56 hrs

ICT-I tripped on Mal-operation of Y-phase Buchholz relay

GI-2

6 Tripping of 400/220 kV ICT-1 at Nelamangala

20-04-2017 at 17:08 hrs

ICT tripped due to mal-operation of Buchholz relay

GI-2

7 Tripping of 400 kV Guttur-Narendra line-1

21-04-2017 at 18:01 hrs

Line tripped on operation of over-voltage protection at Guttur end and direct trip was received at Narendra. DR and EL of Guttur station were not furnished to validate the tripping

GI-2

8 Tripping of 400 kV Tirunelveli-Kudankulam line-3

23-04-2017 at 05:56hrs

R-phase to earth fault had occurred in line. Tie CB LBB got operated at Tirunelveli end due to sluggish operation of Tie CB

GI-2

9 Tripping of 400/220 kV ICT-2 and 3 at Hoody substation of KPTCL

26-04-2017 at 15:40 hrs

ICT-2 tripped on suspected mal-operation Oil surge relay of B-phase transformer. ICT-3 tripped due to overloading.

GI-2

10 Tripping of 220 kV Alipura - Regulapadu line

29-04-2017 at 09:25 hrs

line tripped at Alipura on earth fault GI-1

III. Details of Trippings due to Failure or Non-operation of Auto-Reclose:

Sl. No. Element Date & Time Reason

Category

1 Tripping of 400kV Uruvakonda-Jamalamadugu line-1

02-04-2017 at 17:58 hrs

R-phase to earth fault and line did not auto-reclose. Fault clearing time - 500ms

GI-2

2 Tripping of 400kV Ghanapur-Mamidapalli line

04-04-2017 at 19:01hrs

B-phase to earth fault. Line auto reclosed from Mamidapalli end and tripped from Ghanapur

GI-2

3

Tripping of 400kV Kudgi-Tumkur line-1

09-04-2017 at 00:13 hrs

R-phase to earth fault had occurred in line. At Tumkur end line auto-reclosed and later tripped due to direct trip receive. At Kudgi end breaker did not attempt for auto-reclose.

GI-2

4 Tripping of 400kV Mysore-Kozhikode line

10-04-2016 at 20:53 hrs

R-phase to earth fault had occurred in line. A/R was successful at Mysore and Main & Tie CB's tripped at Kozhikode end.

GI-2

Annexure-I

Page 2 of 4

5

Tripping of 400kV Krishnapatnam-Nellore line-2

11-04-2017 at 2:41 hrs

Line tripped on due to Y-phase earth fault. Line auto-reclosed at Nellore (AP) and did not auto-reclose at Krishnapatnam.

GI-2

6

Tripping of 400kV Krishnapatnam-Nellore line-1

12-04-2017 at 2:51 hrs

Line tripped on due to Y-phase earth fault. Line auto-reclosed at Nellore (AP) and did not auto-reclose at Krishnapatnam.

GI-2

7 Tripping of 400kV Alamathy-NCTPS-2

12-04-2017 at 3:31 hrs

Y-phase to earth fault. A/r not in service due to communication link failure

GI-2

8 Tripping of 400 kV Alamathy-NCTPS-1

12-04-2017 at 03:43 hrs

B-phase to earth fault. A/r not in service due to communication link failure

GI-2

9 Tripping of 400kV Krishnapatnam line-2

13-04-017 at 3:59 hrs

Y-phase to earth fault. line auto-reclosed from Nellore end and did not auto-reclose from Krishnapatnam end

GI-2

10 Tripping of 400kV Krishnapatnam line-1

13-04-2017 at 4:38hrs

Y-phase to earth fault. line auto-reclosed from Nellore end and did not auto-reclose from Krishnapatnam end

GI-2

11 Tripping of 400kV Vijayawada-Vemagiri line -2

18-04-2017 at 16:29 hrs

R-phase to earth fault had occurred in line. Auto-reclose was successful at Vemagiri end and breaker tripped at Vijayawada

GI-2

12 Tripping of 400kV Vijayawada-Nellore line

19-04-2017 at 16:57 hrs

Y-phase to earth fault had occurred in line and auto reclose was successful at Nellore end and breaker tripped at Vijayawada

GI-2

13 Tripping of 400kV Krishnapatnam-Chitoor line

20-04-2017 at 15:34 hrs

R-phase to earth fault had occurred in line. Auto-reclose was successful at Chitoor and auto reclose was not successful at Krishnapatnam end.

GI-2

14 Tripping of 400kV ALAMATHI- NCTPS ST2 line-1

23-04-2017 at 19:53 hrs

R-phase to earth fault had occurred in line. Line did not auto-reclose due to communication Link Fail between Alamthy and NCTPS

GI-2

15 Tripping of 765kV Srikakulam-Vemagiri line-1

27-04-2017 at 14:51 hrs

Y-phase to earth fault had occurred in line and line did not attempt auto-reclose.

GI-2

16

Tripping of 765kV Kurnool-Nellore PS line-2

27-04-2017 at 22:22 hrs

R-phase to earth fault had occurred in line. Auto-reclose was successful at Kurnool end and breaker at Nellore PS end did tripped and did not attempt for auto-reclose.

GI-2

17

Tripping of 400 kV Alamathy -NCTPS line-2

28-04-2017 at 1:00 hrs

Line tripped due to R-phase to earth fault. Auto-reclose is not in service as Fibre optic cable link is not healthy

GI-2

Annexure-I

Page 3 of 4

IV. Details of Trippings due to PLCC mal-operation:

Sl. No. Element Date & Time Reason

Category

1 Tripping of 400kV Munirabad-Guttur line

09-04-2017 at 18:04 hrs Line tripped due to direct trip receive

from Guttur end.

GI-2

09-04-2017 at 18:52 hrs

2 Tripping of 400kV Cudappah-Chitoor line

15-04-2017 at 19:00 hrs

Line tripped at Cudappah end only on direct trip receive and was holding from Chitoor end

GI-2

16-04-2017 at 10:59 hrs

3 Tripping of 400kV Gooty-Tumkur line

20-04-2017 at 10:38 hrs

Line tripped at Gooty end only and was holding from Tumkur end

GI-2

4 Tripping of 400kV VTPS-Malkaram line

20-04-2017 at 16:24 hrs

Line tripped on Direct Trip Receive at Malkaram and was in service from VTPS

GI-2

5 Tripping of 400kV Ramagundam-Dichipally line

29-04-2017 at 23:54 hrs

Line tripped due to operation of over voltage protection at Dichipally end. Ramagundam end did not trip as direct trip was not received from remote end.

GI-2

6 Tripping of 400kV Hyderabad-Kurnool line

30-04-2017 at 18:04 hrs

Line tripped on over-voltage protection at Kurnool end. Line was holding from Hyderabad end as direct trip was not received from Kurnool.

GI-2

*****

Annexure-I

Page 4 of 4

Meeting No /

Index

Details of Event Date & Time Reason PCSC Recommendations Utility responsible for

Implementation

Status of Recommendations

as on 15.05.2017

Remarks

61/IV/3 Tripping of 400 kV Vijayawada-

Vemagiri line-2

16-12-2016 at

21:52 hrs

&

26-12-2016 at

10:52 hrs

Line tripped on operation of over-voltage protection at

Vemagiri end and Direct Trip was received at

Vijayawada.

APTRANSCO to make DR & EL functional from Vijayawada end

for the line 400 kV Vijayawada – Vemagiri.

APTRANSCO Yet to be informed Pending

APTRANSCO mail dated on 31-08-2016:

To avoid the unwanted malopeartions due to the external LBB trip

initiation from PGCIL, Vide letter Dt: 04-08-2016, APTRANSCO has

requsted the PGCIL to arrange the Master trip relay and breaker contacts

of ICT-1 &2 LV side to enable the internal LBB feature in the Busbar

protection scheme at 220kV Gooty Switching station. Waiting for the

PGCIL response.


To avoid the unwanted maloperations due to the external LBB trip

initiation from PGCIL, vide letter Dt: 04-08-2016, ARTRANSCO has

requested the PGCIL to arrange the Master trip relay and breaker contacts

of ICT-1&2 LV side to enable the internal LBB feature in the Busbar

protection scheme at 220kV Gooty Switching station. Waiting for the

PGCIL response.


Waiting for the PGCIL response.

APTRANSCO mail dated 04.03.2017

SRPC is requested to coordinate with PGCIL in takind necessary action.

Pending

APGENCO to furnish a report on the remedial action implemented

w.r.t. overreaching of Krishnapatnam end distance relays during the

tripping of 400 kV Nellore (PG) - NPS line-1

APGENCO Yet to be informed Pending

Pending Implementation of PCSC Recommendations (up to 62nd Meeting)

Complete outage of 220kV Yerraguntla

substation and tripping of running Units

at Rayalaseema TPS

52/I/2 (GD) PendingMail received on 27-07-2016:

1.The drop out relays of reducer oil pumps time setting was increased for

all mills.So there will not be any trip under transient low voltage condition.--

--Complied

2.The recommendation regarding 2 sec time delay will be implemented

during unit shut down and will be intimated immediately after

implementation.------Pending

APGENCO 1. APGENCO to check associated logic for lube oil pump for correct

operation under transient low voltage conditions at Rayalaseema TPS,

Unit-1.

2. APGENCO to keep appropriate time delay/ fault ride through

delay (typically 2 sec) in VFD speed sensor relay at all its generating

Units including Rayalaseema TPS Units.

HV B-Ph Current transformer of 100MVA Power

Transformer -1 failed resulting into a bus fault on

220KV Bus-1. Unit-1 and Unit-5 at RYTPS tripped

during the fault at Yerraguntla substation

21-02-2016 at

10:39 hrs

Andhra Pradesh

APTRANSCO1.APTRANSCO to check the healthiness of the connecting cable

between Gooty (PGCIL) and Gooty (APTRANSCO), and replace it,

if required.

2.APTRANSCO to ensure that the distributed architecture employed

in implementing busbar protection at their Gooty 220 kV SS does not

introduce any unwarranted delays in transmitting the triggering signals

to the Central Unit.

LBB protection got operated for 400/220kV ICT-2

breaker which had resulted in tripping of 220kV Bus-

2 at 220kV Gooty Substation

24-06-2016 at

16:04 hrs

Tripping at 220kV Gooty Substation of

APTRANSCO

56/II/13

57/II/9 Tripping of 400 kV Nellore (PG) - NPS

line-1, 400 kV Krishnapatnam-Nellore

(AP) lines -1&2 and 400kV NPS -

MEPL line

18-07-2016 at

19:05 hrs

Triggering incident was snapping of Y phase

conductor in 400kV Nellore (PG) - NPS line-1.

Distance relay at Krishnapatnam end over-reached in

Zone-1, and resulted in tripping of 400kV

Krishnapatnam – Nellore (AP) lines - 1&2 from

Krishnapatnam end. Distance relay at MEPL over-

reached and resulted in tripping of MEPL-NPS line

from MEPL end.

Annexure-II

Page 1 of 30

58 TSGENCO The issue was discussed in PCSC-58 meeting held on 18.10.2016, when

PCSC forum agreed to de-link the implementation of the Item from the

scope of Protection Audit Recommendations (PAR), and pursue it as part

of PCSC Recommendations.

Pending

62/III/4 Tripping of 400 kV Sattenapalli –

Srisailam line-1

24-02-2017

at 06:48 hrs

R-ph to earth fault. Line did not auto-reclose at

Srisailam end.

TSGENCO (Hydro) to configure all protection relays DR‟s time scale

for a post-triggering period of 2 sec.

TSGENCO Yet to be informed Pending

Triggering incident was R-phase to earth fault in 220

kV Vijayawada TPS - Podili line. Breaker at

Vijayawada TPS end was under lockout and this

resulted in operation of LBB protection and further

leading to tripping of 220 kV Bus-1 at Vijayawada

TPS

02-06-2016 at

00:41 hrs

55/II/21

Telangana

APTRANSCO mail dated on 31-08-2016 & 15-11-2016:

1.Pending

2.Pending

3.PLCC carrier aided protection wasprovided.----Completed

A/R feature ----Pending


At Podili on VTS feeder the old CGL make penumatic operated breaker is

to be replaced with new one.

APTRANSCO mail dated on 04.03.2017:

The existing neumatic mechanism of breaker does'nt support for enabling

of A/R feature on VTS feeder at Podili.

APGENCO/

APTRANSCO

TSGENCO TSGENCO mail dated 30.03.2017:

1. According to SRPC phylosphy power swing block settings are changed

to ALL ZONES BLOCK EXCEPT ZONE1.

---------- Completed

2. M/s. Siemens is requested to depute the service Engineer to update the

firm ware of existing SIPROTEC relays in 400KV switch yard. This work

will be completed on or before 15.04.2017. -------------- Pending

Pending

Provision of line differential protection for Jurala line 1 & 2 (line length-1.45 KM) feeders at 220 kV Jurala HPS [Carry-Over from Protection Audit Recommendations]

Pending1.APGENCO to ensure full-fledged redundancy of supply to the

auxiliaries of all Units in the to-be-reviewed LT arrangement by (i)

ensuring that each Unit‟s auxiliaries are fed from two Station

Transformers connected to different buses, or (ii) any other better

design.

2.APGENCO to keep LBB time setting as 200 msec at their

Vijayawada TPS.

3.APTRANSCO to take steps to provide PLCC carrier

communication & Auto-reclosure facility between VTPS and Podili

SS.

24-12-2016 at

10:52 hrs

61/III/5 Tripping of 400 kV Khammam - KTPS

line-2

Line tripped on B-phase to earth fault. First fault was

persistent for 380 ms. Auto-reclose was successful at

Khammam end during 1st fault. 2nd fault occurred

during re-claim time of breaker hence Khammam end

breakers also got tripped.

1. TSGENCO to implement the SRPC agreed philosophy for Power

Swing Blocking in all distance relays on the feeders emanating from

KTPS.

2. For the line under consideration, TSGENCO to consult relays

OEM to migrate to new versions of Firmware (from to 4.72.01) and

Pset (to 4.70.02).

Multiple tripping at Vijayawada TPS

(Gen Loss : 750 MW)

Annexure-II

Page 2 of 30

62/IV/5 Tripping of 400 kV Gajwel-

Bhoopalapalli line-1

16-02-2017

at 15:00 hrs

Line tripped at Bhoopalapally on DT receive and was

holding from Gajwel.

For the line under consideration, TSTRANSCO to carry out the

following in coordination with TSGENCO:

(i) Healthiness of PLCC system components (hardware and software)

at both ends shall be checked and faulty components shall be repaired/

replaced.

(ii) End-to-end communication for DT/ permissive & other signals

may be ensured by testing at both the ends.

(iii) Frequency bandwidth tuning of PLCC link for faithful

transmission of signals shall be carried out.

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

Tripping of 400kV Nagarjunsagar-

Mahboobnagar line

48/II/5 Pending

For the line under consideration, the following shall be carried out by

TSTRANSCO in coordination with PGCIL (SR-I):

(i) End-to-end communication for DT/ permissive & other signals


(ii) Healthiness of PLCC system components (hardware and software)


replaced.

line tripped on direct trip receive at Gajwel and was

holding from Hyderabad

06-10-2016 at

12:16 hrs

Tripping of 400 kV Gaiwel-Hyderabad

line

59/IV/3 Pending

TSTRANSCO TSTRANSCO mail dated on 21-12-2016:

Due to employee bifurcation process and consequent relieving of

engineers, the data could not be given. However the data for the

subsequent disturbances are being communicated regularly.

TSTRANSCO to furnish a detailed report on the tripping event

along with remedial measures taken to PCSC forum.

220 kV feeders and ICT‟s connected to Bus-1 at 220

kV Ghanapur Station tripped on operation of Bus-bar

protection during fault in 220 kV Ghanapur -

Chandrayangutta lines 1&2

1.TSTRANSCO make DR‟s & EL‟s functional on all feeders distance

protection and busbar protection at their 220 kV Ghanapur SS.

2.TSTRANSCO to modify A/R Block logic such it gets blocked not

on account of mere Z2/ Z3 pick-up, but only when Z2/ Z3 protection

issues trip command at their 400 kV Mamidipalli SS for all feeders.

3.TSTRANSCO to spare one potential-free contact to PGCIL (SR-II)

for triggering DR/EL of 400/ 220 kV ICT‟s at their 400 kV Ghanapur

SS.

21-09-2016 at

19:10 hrs

Multiple trippings at 220 kV Ghanapur

substation

59/II/3 TSTRANSCO TSTRANSCO mail dated on 21-12-2016:

1. DRs and ELs are already functional and also submitted in the 59th

PCSC Meeting.

2. A/R Block logic is been modified.

3.---Pending

Pending

TSTRANSCO mail dated on 21-12-2016:

(i) Letter is been given to field for conducting end to end testing of 400kV

Gajwel-Ghanapur line.

(ii) Healthiness of PLCC system components will be checked while

conducting end to end testing.

TSTRANSCO

TSGENCO /

TSTRANSCO

Yet to be informed Pending

Annexure-II

Page 3 of 30

RTPS Tripping incidents and the Spl

meeting held at RTPS on 13th and 14th

March 2014

The PCSC forum recommended for replacement of existing

electromechanical relays with Numerical relays.

Karnataka

Spl meeting held at RTPS on 13th

and 14th

March

2014

Mar-1430/I/A Pending Mail recieved on 28-05-2015:

1. e- Tender folated for the retrofit of existing static relays with Numerical

version for lines M.nagar,M.bad,ICT-1 & 2 -Technical Bid & Price bid

opened . Bid evaluation and approval to place P.O. is in progress.

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

Budgetetory offers obtained and is in process.

3. Order placed on M/s Siemens to replace relays. The work will be

completed by May - 2015.

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–


Mail recieved on 21-10-2015 and 23-11-2015:

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 the

following lines/ICTs have been completed/commissioned as follows:

a) ICT-2 –Commissioned on 01-08-2015

b) ICT-1 ---Commissioned on 08-08-2015

c) Munirabad line--- Commissioned on 16-08-2015.

d) Mehaboobnagar line-- Commissioned on 09-09-2015.

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–


KPCL

Annexure-II

Page 4 of 30

A fault had occurred in 220 kV Kadra and Kodasalli.

As A result, de-energization of 220kV bus occurred at

Kadra and Kodasalli.

13-11-2014 at

19:31hrs

41/I/1

Tripping of

400/220kV ICT-1 at

BTPS

43/II/14

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.

38/GD/3.5 GD-1 at Kadra and Kodasalli hydro

power station

GD-1 at 220kV Kadra power Station of

KPCL

ICT tripped due to operation of Over current and

Earth fault relay

14-01-2015 at

1:09

hrs

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.

Mail received on 07-07-2015 , 21-10-2015 and 23-11-2015:

1. Completed.

2. Completed.

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

reviewed.

KPCL to check the possibility of providing line differential protection

between RTPS and Yermarus stations.

Pending

PendingKPCL


1) e-NIT floated on 28.07.2014 for procurement of Numerical distance

relays & GPS. As there is change in scope of work and quantity of relays

by more than 25%, which is not permitted as per KTPP act. Hence, tender

cancelled and refloated on 05.05.2015 with revised scope of work and

revised PQR.

2. However, as per the recommendations of PSAG, Relays were

temporarily rearranged, replaced and wired up. testing & commissioning

shall be completed with the assistance of KPTCL.


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.


NIT floated on 5.5.15 through e-portal. Bid evaluation completed. LOA's

issued to M/s Schneider Electric Infrastructure Ltd. on 08.10.2015.


LOA's issued to M/s Schneider Electric Infrastructure Ltd. on 08.10.2015.

Engineering work is in progress.

Status informed during Special Meeting held on 03.06.2016:

LOA‟s issued to M/s Schneider on 08.10.2015. Inspection of relays

completed and received at site. DI issued for all balance materials except

furnitures.

PendingKPCL1. The PCSC forum requested KPCL to speed up the installation of

Numerical Distance Protection relay in Kadra –Kaiga and

Kodasalli –Kaiga.

2. The PCSC forum requested KPCL to submit the implementation

status of PSAG-10 recommendations within a week‟s time.

KPCL vide their mail dated 07.07.2015 informed that revised relay settings

would be incorporated in co-ordination with KPTCL.

Mail received on 07-09-2015 , 21-10-2015 and 23-11-2015:

Revised relay settings are awaited from KPTCL.

Revised relay settings furnished by KPTCL will be incorporated in co-

ordination with KPTCL shortly.

Annexure-II

Page 5 of 30

49/II/15 Trippings at Raichur TPS 12-11-2015 at

00:30 hrs

Running Unit-4, 5 and Unit-8 and 400kV RTPS-

Yeramaras TPS feeder got tripped due to de-

energization of both 400kV Bus-1&2 at Raichur TPS

1. KPCL to carry out hot-line washing of RTPS-connected lines

regularly to avoid trippings due to fog and dust.

2. KPCL may see the feasibility of providing breaker flashover

protection at RTPS, and implement the same if possible.

KPCL Status informed during Special Meeting held on 03.06.2016:

1. Hot line washing was done previously.tender process is on for silicon

coating of insulators.

Pending

54/II/4 Tripping of 400 kV Raichur TPS-

Mahboobnagar line

05-04-2016 at

10:23 hrs

Line tripped on operation of Backup impedance

protection of line reactor. Direct trip was received at

Mahboobnagar end.

KPCL to keep the functioning of the concerned electro-mechanical

back-up impedance protection relay under observation, and replace it

with a spare at the earliest.

KPCL Yet to be informed Pending

54/II/9 Pending

46/II/21 Trippings at 220kV Raichur TPS 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.

1.KPCL to undertake the following remedial measures to avoid

breaker flashovers:

(i) Replacing all porcelain insulators with composite insulators

(ii) Carrying out hot-line water washing of all insulators on regular

basis.

(iii) Applying Room Temperature Vulcanizing (RTV) Silicone high

voltage insulator coatings to all bus-connected ceramic insulators of

equipment like CT, PT, CB, Isolators etc.

2.KPCL to take steps to provide dedicated breaker flashover

protection to all breakers at Raichur TPS at the earliest.

KPCL

1. KPCL to revise the settings of GT‟s back-up O/C and E/F

protections considering their individual contribution to solid bus fault

at 220 kV bus of Nagjheri PH.

2. KPCL to upload/ make available various tripping files

(FIR/DR/EL/TR) for all tripping involving their stations in compliance

of IEGC Regulation 5.2 (r).

54/I/4 Tripping of Nagjheri Generators 220 kV Nagjheri - Bidnal line tripped on B-E fault at

12:28 Hrs. At the same time, five running generating

units (1, 2, 3, 4 & 6) at Nagjheri tripped on operation

of Generator Transformer‟s back-up Over Current &

Earth Fault protection.

07-06-2015 at

01:35 hrs


1) Anti-pumping contactors of all the nine 220KV Lines are in circuit and

tested periodically during AOH works of lines along with other protections.

2) Completed.

3) Possibility to use both the 220kV buses as main bus under normal

operation is under review.


1) Completed

3) Two bus operation for 220kV buses : In place of existing CT switching

relays, High speed manual heavy duty change over switch of sufficient

current capacity will be retrofitted to all feeders at 220kV station and same

will be operated manually during changeover of feeder by one bus to the

other and this arrangement may facilitate to put both buses in service. Time

required for this retrofit is around 90days . However, this work will be

taken up only after retrofitting of electromagnetic relays with numerical

relays for Main-2 protection of all 220kV lines, for which work is in

progress.

Yet to be informed

Yet to be informed

KPCL

Pending

Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed.

Unit-4 got tripped on operation of Generator

Differential, Reverse power & LBB protection.

Operation of LBB protection led to tripping of BUS-2

at RTPS

Tripping of 400kV Raichur TPS Bus-2 13-04-2016 at

21:12 hrs

Pending

14-04-2016 at

12:29 hrs

KPCL

Annexure-II

Page 6 of 30

55/II/1

56/I/2 Complete outage of 220kV Sedam

Substation of KPTCL.

19-06-2016 at

15:27hrs

220kV Sedam-Humnabad-2 tripped at Sedam on

Distance protection, Zone-2. Sedam-RTPS-1 &2 lines

tripped at RTPS end only. 220kV Tandoor inter-state

line was hand tripped due to incoming supply failure

KPCL to disable GFC protection on all lines emanating from their

generating stations.


57/II/3 Tripping of 400/220 kV ICT-2 at Raichur

TPS

07-07-2016 at

3:32 hrs

ICT-2 tripped on operation 400/220KV ICT-2 was

tripped on operation of 220KV side Instantaneous

over current protection during B-phase to earth fault

in 220kV RTPS-Sedam-II line.

KPCL to review appropriately the high-set of ICT‟s back-up O/C

protection at their 220 kV RTPS so that they do not operate for a

normal through fault.


58/I/2 (GD) Complete outage of 220 kV Nagjheri PH

of KPCL.

31-08-2016 at

12:47hrs

Bus dead occurred at 220kV Nagjheri PH due to

tripping of evacuating lines.

(i) KPCL to disable high-set operation of DEF relays

(ii) KPCL to block DEF relays whenever corresponding distance

protection relays pick up at Kodasally end on Nagjheri – Kodasalli

lines, and

(iii)KPCL to provide stand-alone Event Logger at their 220 kV

Nagjheri PH.


58/I/3 (GD)

Pending

PendingYet to be informed

KPCL In view of the availability of two buses along with healthy bus-

coupler at 220 kV RTPS, KPCL is recommended to put in service the

double-bus operation at 220 kV RTPS by suitably distributing loads

within 15 days.

Yet to be informedDuring testing of retrofitted distance protection in

400kV Raichur-2 feeder, LBB protection trip DC got

extended to Bus trip. This resulted in tripping of

220kV bus at RTPS and all connected 220 kV

elements. Unit-4 which is connected to 400 kV Bus

got tripped due to tripping of Station Utility

Transformer that is connected 220 kV bus

06-09-2016

at 14:40 hrs

31-05-2016 at

17:21 hrs

Direct Trip was sent from YTPS to RTPS and BTPS

01-05-2016 at

21:44 Hrs

LBB of 220kV Kodasalli breaker at Kadra end got

operated which resulted in tripping of Bus at Kadra

and in turn led to tripping of all elements

KPCL Yet to be informed

(i) KPCL to check settings of LBB protection in all relays from which

it was implemented, and ensure that their configuration, logic, and

timing are in order at their 220 kV Kadra PH.

(ii) KPCL to furnish details regarding the existing LT auxiliary

supply arrangement at their 220 kV Kadra PH, and take steps to

provide a suitable Auto-Main-Fail (AMF) panel for DG set to effect

its auto-starting in case of failure of LT supply.

(iii) KPCL to ensure time-sync of all relays (DR‟s & EL‟s) with GPS

at their 220 kV Kadra PH.

(iv) KPCL to provide stand-alone Event Logger at their 220 kV

Nagjheri PH.

KPCL

15-04-2016 at

15:36 hrs

1.KPCL to properly configure the distance relays at YTPS end on

both YTPS – BTPS line and YTPS-RTPS line with specific focus on

reaches and timings of Zone-2, Zone-3, and Zone-4 (reverse).

2.KPCL to ensure the healthiness of Direct Trip circuits and relay

coils at YTPS.

3.KPCL to ensure time sync of DR‟s and EL‟s at YTPS with GPS.

Pending

KPCL

Triggering incident was failure of R-phase CT of

400/220kV ICT-1. 400kV YTPS-RTPS line got

tripped from YTPS end. 400kV RTPS-

Mehaboobnagar line tripped on a B-phase to earth

fault.

1.KPCL to enable zero-sequence compensation feature, if not already

done, in all differential relays of transformers at RTPS.

2.KPCL to examine in detail the reasons for SOTF operation at RTPS

end for the fault on RTPS-Veltoor line, and if required relay

(configuration) settings at RTPS end may be suitably got revised with

the help of their OEM.

3.KPCL to take steps to enable auto-reclose for the Tie-CB‟s in the

dias containing Munirabad and Veltoor (Mehboobnagar) at RTPS.


Tripping of Units at Raichur TPS 54/II/13

Tripping of 400kV Bellary TPS-

Yeramarus TPS line and

400kVYeramarus TPS - Raichur TPS

line

55/II/19

Multiple tripping at 400 kV Raichur TPS

Station

Complete outage of 220 kV Kadra power

station of KPCL

Annexure-II

Page 7 of 30

58/I/7 (GD) Complete outage at Varahi Hydro Power

Station

15-09-2016 at

14:06 hrs

LBB protection operated and caused bus shut down at

Varahi PH

(i) KPCL to check and correct configuration settings of LBB

protection in all relays from which it was implemented, at their 220

kV Varahi PH.

(ii) KPCL to provide stand-alone Event Logger at their 220 kV STR

PH.


58/I/3 (GD)

58/I/5 (GD)

58/I/6 (GD) 12-09-2016 at

14:47 hrs


(i) KPCL to adopt the following VT fuse-fail logic for all 220 kV

lines emanating from NPH:

“Under VT fuse fail condition, distance protection shall normally be

kept blocked. However, upon detection of a fault (sensed by negative

sequence component), blocking of distance protection shall give rise

to operation of its inherent Over-Current protection set with a definite

time delay of 500 msec”.

(ii) KPTCL/ KPCL to revise Zone-2, Zone-3 and Zone-4 (reverse)

timings of DPR of all 220 kV lines emanating from Nagjheri PH in

line with Ramakrishna Committee guidelines.


Yet to be informed

Disturbance in Kerala system

06-09-2016

at 14:40 hrs

9-09-2016 at

11:19 hrs

LBB of 220kV Kodasalli breaker at Kadra end got

operated which resulted in tripping of Bus at Kadra

and in turn led to tripping of all elements

21-01-2017

at 00:38 hrs

KPCL

(i) KPCL to check settings of LBB protection in all relays from which

it was implemented, and ensure that their configuration, logic, and

timing are in order at their 220 kV Kadra PH.

(ii) KPCL to furnish details regarding the existing LT auxiliary

supply arrangement at their 220 kV Kadra PH, and take steps to

provide a suitable Auto-Main-Fail (AMF) panel for DG set to effect

its auto-starting in case of failure of LT supply.

(iii) KPCL to ensure time-sync of all relays (DR‟s & EL‟s) with GPS

at their 220 kV Kadra PH.

(iv) KPCL to provide stand-alone Event Logger at their 220 kV

Nagjheri PH.

KPCL

(i) KPCL to ensure the integrity of the connecting cable/ conductor

from Generating Unit-3 to its corresponding GT breaker at their STR

PH.

(ii) KPCL to ensure the healthiness of Manual Current Regulator

(MCR) of Unit-3‟s AVR at their STR PH.

(iii) KPCL to ensure the healthiness of AVR‟s of all Units of STR

PH.

(iv) KPCL to provide stand-alone Event Logger at their 220 kV STR

PH.

Complete outage of 220 kV Sharavathy

Tail Race PH

Partial disturbance occurred in central Kerala grid due

to overloading and tripping of 220 kV lines. Loss of in-

feed to 220 kV Kalamassery, 220 kV Brahmapuram,

220 kV Ambalamugal, 220 Pallom & 220 kV Kochi

occurred. Generation at Neriamangalam, Panniar,

Chengulam and Pallivasal also got affected during the

incident.

(i) SLDC, KSEB to put in place proper mechanism to ensure

adequate load-generation balance is maintained in their control area at

all times, and due vigilance is exercised in operating an already

depleted transmission network.

(ii) KSEB to put UFR in service at New Pallom end on 220 kV New

Pallom – Amabalamugal line as part of Kudankulam Regional

Islanding Scheme.

KPCL

Complete outage of 220 kV Nagjheri

substation of KPCL

PendingSpurious operation of LBB protection of line feeder

had led to tripping of 220 kV bus at Sharavathy Tail

Race power house.

PendingMail 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.

2. Completed.

3. Completed.

KPTCL Mail recieved on 23-01-2016:

1. Existing back up relays will be replaced by Main-2 protection. LOI

issued M/s Alstom for taking up the works.

KPTCL Mail Recieved dated 25-05-2016:

Under the Scope of R&U. The work will be taken up by M/s Alstom

shortly.


1. ALSTOM make P442 type Numerical relays are supplied to the site,

replacement of M-1 relays(OPTIMHO) by new relays will be taken up

shortly

KPTCL1. 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.

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.

25-10-2014GD-1 at Mahalingapura Substation of

KPTCL

38/GD/3.1


Triggering event was the fault on 220 kV Nagjheri

–Kodasalli line-2. Both buses of 220 kV Nagjeri

power station of KPCL got

de-energized.

62/I/1

Complete outage of 220 kV Kadra power

station of KPCL

Annexure-II

Page 8 of 30

220kV Sedam-

Tandur line

Line tripped on Yphase to earth fault from both the

ends

20-12-2014

at 22:20 hrs

40/IV/1 KPTCL was requested to explore the possibility of providing A/R

feature to this line and submit the remedial measures to the PCSC

forum.

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

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

R&M works.

2. O&M personnel are instructed to take sufficient care in order to avoid

unwarrented trippings. --- Completed.

KPTCL mail received on 23-01-2016:

1. New C&R panels(with numerical relays) erected for 500MVA ICT-1

&2 under R&M work, which will be commissioned shortly.


1. New C&R panels(with numerical relays) erected for 500MVA ICT-1

&2 under R&M work, which will be commissioned shortly.


1. New CRPs mounted in bay KIOSK commissioned under R&M works.

KPTCL1. 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.

Suspected mal-operation of 220kV side Rphase

over current relay

01-12-2014Tripping of 400/220kV

ICT-2 at Hoody

substation of KPTCL

40/I/1 22-12-2014 at

21:22 hrs


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.

---- Completed


1. 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.

KPTCL mail recieved on 23-01-2016:

1. Bus-II PTs yet to be commissioned.Planned to complete before end of

April-2016.


1. Yet to be attended

39/I/5

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.

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.


Carrier protection is being restored for 220kV Sedam-Tandoor line at

Sedam end. After restoring the carrier protection , AR will be enabled.


Carrier protection is being restored for 220kV Sedam-Tandoor line at

Sedam end. After restoring the carrier protection , AR will be enabled.


SEE,SCADA to update the latest status


Action is being taken to restore carrier protection.AR will be enabled once

carrier signal is restored.

KPTCL

GD-1 at 220kV Ambewadi Station of

KPTCL

Pending

Pending

Pending

KPTCL

Annexure-II

Page 9 of 30

Tripping of Unit-1&2

along with 400/220kV

ICT-2 at Raichur TPS

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.

47/II/13

48/I/2 (GD) Complete outage of 220kV Peenya

Substation in Karnataka

42/I/1 (GD) Fault occurred in 220kV Sedam-Shahpur line

41/I/4

06-08-2015 at

4:51 hrs

Yet to be informed

Pending

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.

15-02-2015 at

14:24 hrs

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.

27-01-2015 at

8.00 hrs


1. Bus Bar protection will be provded under R&U.

2. A/R yet to be enabled.


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.


Procurement of Bus bar and LBB protection is in the final tendering stage.


Tandoor line. AR will be enabled.



stage.




1. Bus bar protection panels pocured and erected at Sedam. Wiring ,

testing ,commissioning is being taken up.Planned to complete by April

2016.



KPTCLR-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.

Complete outage at 220kV Sedam

Substation of KPTCL (GD-1)

12-03-2015 at

7:51 hrs

Complete outage of 220kV Sedam

substation of KPTCL


Presentl 220kV Nelamangala -Hoody(i.e. nelamangala-Peenya-Hebbal -

Hoody line is made LIILO at Yelahanka sub station and breaker at

Peenya is kept open, necessary modification in distance relay settings

adopted for new configuration.

KPTCL to activate non-directional Over Current protection with a

time delay of 600-800 msec for Fuse

failure condition at Lingasugur.



stage.



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.

KPTCL to revise distance relay settings at Nelamangala end for 220

kV Nelamangala – Hebbal - Peenya line – 1 for the effective line

length of 17 km. These new settings can be appropriately reviewed as

and when the tie-arrangement at Hebbal is done away with.

PendingComplete outage of 220kV Ambewadi

substation of KPTCL

Pending

42/I/2 (GD)

27-09-2015 at

4:23:17 hrs

Fault in 220kV Ambewadi-Nagjheri line-2

KPTCL

KPTCL

KPTCL

Pending

Pending

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.

KPTCL

Annexure-II

Page 10 of 30

52/I/3 (GD) Complete outage of 220kV Shimoga

substation

22-02-2016 at

15:03 hrs

220kV Bus Bar protection operated during failure of

R phase CT in DVG-2 line bay.

KPTCL to operate 220 kV Shimoga on multi-bus operation under

normal conditions, put it on single-bus operation only under

emergency conditions.

KPTCL KPTCL Mail received dated 25-04-2017:

Replacement of existing BBP by new BBP with 4 zone protection is being

taken up under R&U.

Pending

56/II/6 Tripping of 220kV Ambewadi-Ponda

(Xeldam) line-1

10-06-2016 at

13:33 hrs

Line tripped on Y-E faut due to DPR, Z1 operation KPTCL to keep A/R for Ambewadi – Ponda (Xeldam) line-1 in

service with immediate effect.

KPTCL Yet to be informed Pending

48/I/3 (GD) 30-09-2015 at

10:41 hrs

KPTCL to fast-track providing A/R on all 220 kV lines emanating

from Ambewadi SS to prevent Station shut-down on temporary faults.

Failure of Lightning Arrestor of Y-phase Line Reactor

of 400kV Guttur-Hiriyur line-1 and line tripped on

distance protection Zone-1. Bus-bar protection of

400kV Bus-2 at Guttur substation also got operated

during the event sensing this through fault. 400/220

kV ICT-1 & 2 at Guttur, 400kV Kaiga-Guttur-2,

400kV

Guttur-Narendra-2, 400kV Guttur-Hiriyur-2 and

400kV Guttur-Munirabad which are on 400kV Bus-2

got tripped during the incident. 400kV Guttur-

Narendra-1 which was on Bus-1 also tripped at the

same time.

Multiple tripping at 400kV Guttur sub-

station

17-01-2016 at

18:53 hrs

Tripping of 220 kV Chikkodi-Mudshingi

and 220 kV Chikkodi-Talandage lines

51/II/21 1. KPTCL to configure all DR‟s and EL‟s at 400 kV Guttur SS so

that they will also get triggered for BBP operation.

2. KPTCL to ensure time-synchronization of all DR‟s and EL‟s with

GPS at their 400 kV Guttur SS.


Will be complied in a months time.

57/II/1

Complete outage of 220kV Peenya

Substation of KPTCL

49/I/1.3 (GD)

53/I/1

KPTCL Mail received dated 25-05-2016:

SEE, RTC, Bangalore to update the status


Providing numerical bus bar protection to 400kV buses and GPS time

synchronising equipment at Guttur is considered under R&U. Work is

awarded to M/s Alstom, execution will be taken up shortly.


GPS and accessories will be supplied during May 2017, expected to

complete the work within a month after supply of materials

1. KPCL to provide A/R on all 220 kV lines emanating from Nagjheri

PH.

2. KPTCL to provide A/R on all 220 kV lines emanating from

Ambewadi SS.

220kV Nagjheri-Ambewadi line-1 tripped at 13:33

hrs due to B phase to earth fault. Ambewadi was

radially fed from Nagjheri power station through

220kV Nagjheri-Ambewadi line-2. Tripping of this

line caused 220kV Bus shut down at Ambewadi and

remaining lines and transformers were hand tripped

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.

Complete outage of 220kV Ambewadi

Substation of KPTCL

KPTCL PendingOutage of 220kV Ambewadi station in

Karnataka

Pending

Triggering incident was failure of B-ph PT of 220kV

Bus-2 (western bus) at 220KV Chikkodi substation.

220KV Chikodi- Belgaum-I line tripped on DEFR

(Inst), 220KV Chikkodi-Kudachi line tripped on

Distance protection and also 100MVA transformer-2

tripped on E/F protection.

29.10.2015 at

14:34 hrs

Pending

Pending16-03-2016 at

11:39 Hrs

KPTCL

Yet to be informedKPTCL

220kV Peenya-Nelamangala-3 tripped on B-E fault at

both ends. At the same time, 220kV Peenya-

Nelamangala-4 tripped on R-Y fault only at

Nelamangala end, and was in service from Peenya

end. Due to tripping of these two lines, 220kV Peenya-

Nelamangala-2 tripped on overcurrent protection.

KPTCL to furnish a report on the tripping of 220 kV Peenya-

Nelamangala line-4 Nelamangala detailing the remedial measures

taken including the settings adopted for Z1B (Zone extension) and

Power Swing Block.

01-07-2016 at

03:03 hrs


SEE, RTC, Bangalore to update the status

KPTCL

KPTCL Yet to be informed Pending1.KPTCL to take steps to provide busbar protection at their 220 kV

Chikkodi inter-regional substation, and furnish a time-line for the

same.

2.KPTCL to review distance protection settings for 220 kV Chikkodi

– Kudachi line.

3.KPTCL to furnish equipment failure report of the current incident to

PSE&TD Division of CEA with a copy marked to SRPC.

Annexure-II

Page 11 of 30

59/II/13 Tripping of 220 kV Bidadi (PG) - Bidadi

lines - 1&2

02-10-2016 at

10:32 hrs

Line-2 tripped in DPR, Zone-2 and Line-1 tripped on

operation of E/F protection from Bidadi end.

KPTCL to resolve PLCC carrier communication issues on 220 kV

Bidadi – Bidadi-PG D/C lines, and subsequently restore Zone-2

timing to normal values.


62/II/3 Tripping of 220 kV Bus 2 and connected

elements (220kV HAL #1 and 2,

400/220 kV ICT- 1, 2 and 220/66 kV

ICT-2) at 400/220 kV Hoody substation

of KPTCL (Load loss : 590 MW)

09-01-2017 at

23:06 hrs

Failure of R-phase CT of 220/ 66 kV transformer-2 at

220kV Hoody end resulted in a bus fault in 220kV

Bus-2. Fault was cleared by backup protection of

ICT's (220kV lines were being radially operated) due

to absence of busbar protection

1. KPTCL to provide Busbar protection at their 220 kV Hoody SS at

the earliest.

2. KPTCL to furnish an Equipment Failure Report on CT failure to

CEA with a copy marked to SRPC.

KPTCL KPTCL mail received dated 25.04.2017:

Numerical BBP is being provided under R&M works

Pending

59/IV/4 Tripping of 400 kV Guttur-Hiryur line-1 10-10-2016 at

3:15 hrs

Line tripped at Hiryur end due to direct trip receive

and was holding from Guttur

For the line under consideration, the following shall be carried out by

KPTCL in coordination with

PGCIL (SR-II):

(i) End-to-end communication for DT/ permissive & other signals


(ii) Healthiness of PLCC system components (hardware and software)


replaced.

KPTCL

Tripping of 400 kV Neelamangala-

Hoody line-1

62/IV/4 KPTCL Yet to be informed Pending

Complete outage of 220kV Nagjheri

power station and 220kV Ambewadi

substation of KPTCL

Tripping of 220 kV Chikkodi-Mudshingi

and 220 kV Chikkodi-Talandage lines

51/I/3

62/II/5 Tripping of 220 kV South Bus and

connected elements (220kV HSR, 220kV

Nagnathpura, 220 kV Harohalli, 220 kV

Subramanyapura, 220 kV Tataguni, 220

kV Mallur and 400/220kV ICT-2 and 3)

at 400/220kV Somanhalli substation of

KPTCL

(Load loss: 850 MW)

20-01-2017 at

14:34 hrs

Triggering incident was fault in 66 kV Somanahalli -

Bannerghatta line and fault was cleared by operation

of Back-up OCR at Somanahalli end.

KPTCL to provide numerical Busbar Protection at their 220 kV

Somanahalli SS at the earliest.

KPTCL to carry out the following for the line under consideration:

(i) Healthiness of PLCC system components (hardware and software)


replaced.

(ii) End-to-end communication for DT/ permissive & other signals


Line tripped at Hoody end on direct trip receive and

was holding from Neelamangala end.

15-02-2017

at 13:44 hrs

57/II/1 Triggering incident was failure of B-ph PT of 220kV

Bus-2 (western bus) at 220KV Chikkodi substation.

220KV Chikodi- Belgaum-I line tripped on DEFR

(Inst), 220KV Chikkodi-Kudachi line tripped on

Distance protection and also 100MVA transformer-2

tripped on E/F protection.


KPTCL mail received dated 25.04.2017:

Numerical BBP is being provided under R&M works

PendingKPTCL

KPCL/ KPTCL

01-07-2016 at

03:03 hrs

Status informed during Special Meeting held on 03.06.2016:

1. KPTCL informed that the matter had been taken up with concerned Line

Operation and Maintenance wing to carry out corridor clearance and

maintenance as per schedule to avoid frequent line faults in this corridor. A

letter had also been addressed to Chief Engineer, Bhagalkot zone, to ensure

lines in & around Kali complex are maintained in healthy condition. ---

Completed

2. KPTCL assurd that the final modified SPS would be implemented at

Nagjheri PH at the earliest. ------ Pending

3. KPCL informed that Nagjhari- Kodasalli Lines 1 & 2 had been kept in

service since 23.05.2016 @ 08.06hrs. ---- Completed


Modifications to be carried in Nagzari SPS logic is submitted to

SRLDC/SRPC for verification and approval

220kV lines from Nagjheri power house started

tripping from 11:00 hrs due to fault in lines. The

sequence of tripping is shown in SOE list. At 12:33

hrs, 220kV Narendra-Ambewadi lines-1&2 got

tripped which resulted in loss of evacuation path to

Nagjheri station resulting in tripping of running Units

and complete outage at Nagjhheri power station.

220kV Ambewadi station also got de-energized due

to tripping of source feeders i.e. 220kV Narendra-

Ambewadi-1&2 and 220kV Nagjheri-Ambewadi-

1&2.

22-02-2016 at

12:36 hrs

Pending


1. To avoid tripping of transmission lines on transient faults, KPCL/

KPTCL 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).

2. KPCL/ KPTCL to review operation of SPS at NPH for

functionality (reduction of generation with tripping of evacuating

lines) and healthiness.

3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into service if

more than 200 MW generation from Kali Complex (with Nagheri

Contribution not less than 50 MW) is ensured on sustained basis.

1.KPTCL to take steps to provide busbar protection at their 220 kV

Chikkodi inter-regional substation, and furnish a time-line for the

same.

2.KPTCL to review distance protection settings for 220 kV Chikkodi

– Kudachi line.

3.KPTCL to furnish equipment failure report of the current incident to

PSE&TD Division of CEA with a copy marked to SRPC.

Annexure-II

Page 12 of 30

56/I/3 Complete outage of 220kV Ambewadi

Substation of KPTCL.

24-06-2016 at

20:57hrs

B phase to earth fault had occurred in 220 kV

Ambewadi-Ponda line-2. Fault was cleared by

tripping of feeders from remote end

1.KPCL & KPTCL to furnish an action taken report on the

recommendations given by PSAG-16 to PCSC forum.

2.KPTCL to keep A/R for Ambewadi – Ponda line-2 in non-auto

mode (i.e., only 3-ph trip should get extended on occurrence of a

fault) till the line is closed from Ponda end.

KPCL/KPTCL Yet to be informed Pending

62/V/3 TANTRANSCO mail dated 12.04.2017:

1. The recommendation will be ensured. AR logic will be configured in

Distance Protection relay itself instead of BCU. OEM has been addressed.

2. Post triggering period of 2 sec. to cover AR operation in DR time scale

will be provided.

Pending

1. TANGEDCO to replace existing Check-Zone relay with a new one

possessing required performance.

2. TANGEDCO to take steps to provide numerical busbar protection

at their 220 kV Tuticorin TPS. TANGEDCO may also explore

providing dual CT‟s (on either side) for all B/S breaakers at the time

of commissioning of numerical BBP, if there were no space

constraints.

3. TANGEDCO to take steps to provide for standalone Event Logger

(EL) and standalone Disturbance Recorder (DR) with automatic

downloading facility to a centralized server.

Failure of Bus Section-I Y-ph CT resulted in

operation of bus-bar protection for Bus Sections -I &

II. Running Units#1, 4 and 5, 230 kV Kayathar,

230kV Kudankulam, 230kV Sterlite, Station

Transformer-1, 2 & 3 got tripped during the incident.

Unit – 2 & 3 were not in service.

25-01-2017 at

22:36 hrs

Tripping of running Units & 230kV

feeders at Tuticorin TPS of TANGEDCO

(Gen Loss: 640 MW)

62/II/7 TANGEDCO TANGEDCO mail dated 15.04.2017:

1) New Relay is tested and ready for replacement.Now all 5 units are in

service.The relay will be replaced when lesser units are in service. ---

Pending

2.a)Steps are taken to renovate & mordernization of all the control panel

into Numerical based control panels. --- Pending

2.b) Since 230 KV indoor switchyard has no spare space providing dual

CT`s is not fessible. -- Completed

3) Procurement of EL & DR is under progress. --- Pending

Pending


SEE,SCADA to update the status of healthiness of carrier protection of

220kV RTPS-Raichur 1 &2 lines


Details sought from KPCL for review of ICT's back up (high set) proection

settings as suggested. KPCL is yet to furnish the details required to give

the revised settings.

Tamil Nadu

Complete outage of 220kV Ambewadi

station of KPTCL and 220kV Nagjheri

of KPCL

15-03-2016 at

12:28 hrs

ICT-3 tripped due to operation of back-up earth fault

protection during fault in 220kV RTPS-Raichur line-

1.

KPCL/KPTCLKPCL/ KPTCL to check the ICT‟s back-up (high-set) protection

settings, and ensure that they operate with a time delay of 100 msec.

Tripping of ICT-3 at Raichur Substation




1. KPCL to furnish a report on the reasons for Unit-6 tripping at

Nagjheri PH.

2. KPCL/ KPTCL to modify suitably the SPS at Nagjheri Power

House such that it would also factor in the over loading of Ambewadi-

Narendra lines.




1. TANGEDCO to take properly configure A/R logic at NCTPS-II in

that in case of unsuccessful auto-reclsoure, three-phase trip shall be

given along with A/R block.

2. TANGEDCO to configure all protection relays DR‟s time scale at

NCTPS-II for a post-triggering period of 2 sec to capture events such

as complete A/R operation.

R-phase to earth fault due to de-capping of insulator.

Auto-reclose attempt was unsuccessful.

22-02-2017 at

06:16 hrs

Tripping of 400 kV NCTPS-

S.V.Chatram line-2

Pending

Complete outage of 220kV Nagjheri

power station and 220kV Ambewadi

substation of KPTCL

51/I/3

53/I/3 (GD) Ambewadi Narendra line-2 tripped on fault and

220kV ambewadi Narendra line-1 tripped due to over-

loading. Running Units at Nagjheri also tripped during

the event due to tripping of evacuating lines

KPCL/ KPTCL Status informed during Special Meeting held on 03.06.2016:

1. KPTCL informed that the matter had been taken up with concerned Line

Operation and Maintenance wing to carry out corridor clearance and

maintenance as per schedule to avoid frequent line faults in this corridor. A

letter had also been addressed to Chief Engineer, Bhagalkot zone, to ensure

lines in & around Kali complex are maintained in healthy condition. ---

Completed

2. KPTCL assurd that the final modified SPS would be implemented at

Nagjheri PH at the earliest. ------ Pending

3. KPCL informed that Nagjhari- Kodasalli Lines 1 & 2 had been kept in

service since 23.05.2016 @ 08.06hrs. ---- Completed




KPCL/ KPTCL18-03-2016 at

14:40 hrs

220kV lines from Nagjheri power house started

tripping from 11:00 hrs due to fault in lines. The

sequence of tripping is shown in SOE list. At 12:33

hrs, 220kV Narendra-Ambewadi lines-1&2 got

tripped which resulted in loss of evacuation path to

Nagjheri station resulting in tripping of running Units

and complete outage at Nagjhheri power station.

220kV Ambewadi station also got de-energized due

to tripping of source feeders i.e. 220kV Narendra-

Ambewadi-1&2 and 220kV Nagjheri-Ambewadi-

1&2.

22-02-2016 at

12:36 hrs

Pending

Pending

TANGEDCO

1. To avoid tripping of transmission lines on transient faults, KPCL/

KPTCL 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).

2. KPCL/ KPTCL to review operation of SPS at NPH for

functionality (reduction of generation with tripping of evacuating

lines) and healthiness.




53/II/1

Annexure-II

Page 13 of 30

Disturbance in 220kV Tamilnadu system

43/II/5 Tripping of 400kV

Alamathy-

SVChatram line-1&2

and 400/230kV ICT

at S.V.Chatram

TANTRANSCO TANTRANSCO vide their mail dated 24.06.15 informed that different

relays in Main-I & Main-II would be ensured at the earliest.

Mail recieved on 24-07-2015 ,19-02-2016 and 24-03-2016:

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


TANTRANSCO: Not feasible in the existing SAS sub stations. Hence,

exemption may be given for these sub stations.

Mail received on 20-05-2016 ,16-06-2016,25-07-2016 & 24-09-2016 :

As discussed in the 52nd PCSC meeting, Swapping of Relays between two

stations is not feasible in the existing SAS sub stations. Hence, exemption

may be given for these sub stations.

Status received vide mails received on 10-11-2016 & 20.12.2016 &

12.04.2017:

Different make Relays will be ensured for Main-I & II relays at Alamathy

end.

Pending29-03-2015 at

15:29 hrs

Line-2 tripped on R-phase to earth fault.

Line autoreclosed at SVChatram end and failed to

reclose at Alamathy end. 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.

Complete outage of 230kV Palladam, 230 kV

Othakalmandapam S/s, 230 kV Coimbatore S/s, 230

kV Thudialur and 230 kV Sadayapalayam S/s

05-09-2015 at

14:04 hrs

TANTRANSCO to take suitable measures like installing more stub-

towers along 230 kV OK Mandapam – Myvady line to avoid

excessive sag due to over-loading.

TANTRANSCO Mail received on 19-02-2016, 24-03-2016 and 27-04-

2016:

230kV Othakalmandapam - Myvadi feeder will be made LILO at Kongal

Nagar. Line restringing will be carried out along with the above proposal.

Mail Received on 20-05-2016 ,16-06-2016,25-07-2016 & 24-09-2016:



Status received vide mails received on 10-11-2016 & 20.12.2016 &

12.04.2017:



TANTRANSCO48/I/1 (GD) Pending

Annexure-II

Page 14 of 30

Complete outage of 230 kV

Gummidipoondi Station of TANTRANSCO

Complete outage of 230kV Mywadi

station of TANTRANSCO

50/I/3 (GD)

The issue was discussed in PCSC-58 meeting held on 18.10.2016, when

PCSC forum agreed to de-link the implementation of the Item from the

scope of Protection Audit Recommendations (PAR), and pursue it as part

of PCSC Recommendations.

Status received vide mails dated 10.01.2017 & 12.04.2017:

Different make Relays will be provided for Main-I & II relays at

Sunguvarchatram end in a phased manner.

PendingTANTRANSCODifferent type and Make of distance protection relays to be provided for Main-I & Main-II protection for 230kV feeders at 400 kV Sunguvarchathiram & 230 kV Sunguvarchathir

Documents

पता - SRPC, Bengaluru · 2017. 5. 25. · Agenda for the 64th Meeting of PCSC scheduled to be held on 25th May, 2017 Page 1 SOUTHERN REGIONAL POWER COMMITTEE. BENGALURU. Agenda