· ... relay setting details ... training programme on protection audit methodology and relay...
TRANSCRIPT
Agenda for the 60
th Meeting of PCSC scheduled to be held on 22
nd December, 2016 Page 1
SOUTHERN REGIONAL POWER COMMITTEE BENGALURU
Agenda for the 60th Meeting of Protection Coordination
Sub-Committee of SRPC to be held on 22nd December, 2016 (Thursday)
1. Introduction
2. Confirmation of Minutes of last PCSC meeting
Confirmation of minutes of 59th Protection Coordination Sub-Committee meeting held on 22.11.2016.
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 period November-December, 2016 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/ give 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: (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 01.11.2016 – 30.11.2016 had been brought to Constituents’ notice vide SRPC letters (i) No. SRPC/ SE-III/ PCSC-60/ 2016/7732 dated 24.11.2016 and (ii) No. SRPC/ SE-III/ PCSC-60/ 2016/ 7829 - 33 dated 06.12.2016. 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 58th PCSC meeting) given at Annexure-II may please be sent latest by 18.12.2016.
Agenda for the 60th
Meeting of PCSC scheduled to be held on 22nd
December, 2016 Page 2
4.2 Remedial measures for "Transmission Elements under Forced Outage"
The Constituents are requested to send the remedial measures/ action taken by them for the tripping events as circulated vide our emails. (Annexure-III)
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 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.
The sought status for the month of November, 2016 is awaited from the following SR-Constituents:
APGENCO (Hydro), APTRANSCO, TSGENCO (Hydro), TSTRANSCO, KPTCL, TANGEDCO, NTPC (Kayamkulam), NPCIL (KAPS), NLC, NTPL, & CEPL
5. GSC-Task2: Training Programme on Protection Audit Methodology and Relay
Settings Calculation & Coordination NLDC vide their letter No. NLDC/ System Operation/ RPC/ Training dated 05.12.2016 intimated that as part of GSC-Task2 activities, the Consultant, M/S Tractebel Engineering, would be conducting a five-day training programme on protection system operation with specific focus on protection audit methodology and relay setting calculations & coordination for SR-Constituents during 16-20 January, 2017 at SRPC Secretariat, Bengaluru. The schedule of the training programme is as follows: DAY 1:
Protection audit scope Description of the works during the audit General observations Comments and general recommendation after the audit Q&A
DAY 2-4: Presentation of the steps needed to be done for the future 90% of the
electrical substation, based on the protection audit experiences for 10% of the of the substations
Necessary input data for protection settings Line protection settings for different relay types (ABB, SIEMENS,ALSTOM,
GE, etc),
Agenda for the 60th
Meeting of PCSC scheduled to be held on 22nd
December, 2016 Page 3
Transformer and Shunt Reactor protection settings for different relay types
(ABB, SIEMENS,ALSTOM, GE, etc), Practical settings calculation base on real case, Q&A.
DAY 5:
International practices presentation, SCADA system description, general architecture, General protection principles for typical elements (line, transformer...), Protection functions for typical elements (line, transformer...), Relay settings carry out process, Q&A.
In this regard, SR-Constituents are requested to kindly send their nomination of suitable personnel for the five-day training programme to SRPC Secretariat ([email protected]) latest by 31.12.2016 as follows:
SR-Constituent
No. of Nominations
PGCIL (SR-I), PGCIL (SR-II), NTPC, NPCIL, NLC, APGENCO, TSGENCO, KPCL, TANGEDCO & PED
max. Two each
APTRANSCO, TSTRANSCO, KPTCL, TANTRANSCO & KSEB
max Three each
IPP’s
One each
6. Auto-Reclosure (A/R) Implementation on all 220 kV & above transmission lines of southern region It is common knowledge that majority of the faults that occur on transmission lines are of transient nature; hence provision of Auto-Reclosure certainly helps not only in preventing forced outage of the subject transmission line, but also in averting cascade trippings, in some cases, of adjacent transmission lines due to consequent over-loading. The provision for Auto-Reclosure is also mandated by Regulation 43 (4) (c) CEA Technical Standards for Construction of Electrical Plants and Electric Lines, 2010, which has force of law. Therefore, it is in the interest of grid security that all Constituents implement auto-reclosure feature on all 220 kV & above transmission lines in their respective control areas. Any exceptions to this needed to be properly justified. In this regard, all SR-Constituents are requested to kindly furnish the following details before or during the 60th PCSC meeting:
Agenda for the 60th
Meeting of PCSC scheduled to be held on 22nd
December, 2016 Page 4
1. Status of implementation of A/R: Sl.
No. Name of the Constituent
220 kV
400 kV 765 kV
Total no. of lines
No. of lines where A/R is in service
Total no. of lines
No. of lines where A/R is in service
Total no. of lines
No. of lines where A/R is in service
1 APGENCO
2 APTRANSCO
3 TSGENCO
4 TSTRANSCO
5 KPCL
6 KPTCL
7 TANGEDCO
8 TANTRANSCO
9 KSEB
10 PED
11 PGCIL (SR-I)
12 PGCIL (SR-II)
13 NTPC
14 NPCIL
15 NLC
16 JSWEL
17 UPCL
18 TPCIL
19 CEPL
20 HNPCL
21 IL&FS
22 NTPL
23 MEPL
24 SEL
2. Action plan for implementing A/R on those transmission lines, where it is presently not in service. 7. Status of procurement of DTPC’s for loads identified for Kudankulam Unit-II
(KKNPP-II) SPS
At the time of finalization of KKNPP-II SPS in August, 2016, it was informed by PGCIL that procurement & commissioning of new DTPC’s would be completed in two-three months. The status in this regard would be furnished by PGCIL.
8. Other Protection Issues, if any, with the permission of the Chair
9. 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.
10. Date of next PCSC meeting
The 61st PCSC meeting would be conducted on 27th January, 2017 (Friday) at
Neyveli Lignite Corporation (NLC), Neyveli, TamilNadu.
*****
Grid Occurrences-60 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 220kV Brahmapuram substation.
15-11-2016 at 00:31 hrs
220kV Cochin Kalamassery line#1 and 220kV Cochin Brahmapuram line #1 tripped due to distance protection operation at both the ends. Meanwhile bus bar protection acted at 220KV Brahmapuram substation tripping all the connected elements of bus 1 and bus 2.
Load loss : 160 MW
GD-1
2 Partial disturbance in Tamilnadu
25-11-2016 at 17:22 hrs
Running units at Neyveli complex (NLC TS-2 stage-1, NLC TS-1 and STCMS) got tripped. 400/230kV ICT#1 and #2 at Trichy and NLC TS-2 got tripped due to operation of overcurrent protection.Bus fault had occurred at 230kV Alandur substation due to snapping of conductor in 230kV Pudukottai feeder
Load loss : 1500MW Gen loss : 800MW
GD-1
3 Complete Outage of 400kV NLC1EXP Station
16-11-2016 at 02:13 hrs
Failure of R-phase bus coupler CT blast resulted in operation of bus bar protection at NLC1EXP
Gen loss : 395 MW
GD-1
Annexure-I
Page 1 of 4
II. Details of Grid Incidents:
Sl. No.
Details of Event Date & Time
Reason Remarks Category
1
Tripping of 400kV NTPL-Tuticorin PS line #1 and #2
15:37 hrs on 04-11-2016
400kV NTPL- Tuticorin PS line #2 due to failure of Lightening Arrester (LA) at NTPL end. 400kV NTPL- Tuticorin PS line #1 tripped at Tuticorin PS end ono operation of zone 2 of distance protection but line was holding at NTPL end. Running units tripped due to tripping of evacuating lines
Gen loss 350MW
GI-2
2
Tripping of 400kV Kalivandapattu-Vallur line-1
04-11-2016 at 23:19 hrs
Y-phase to earth fault had occurred in line. At Kalivandapattu end 3 phase trip was given due to powerswing detection which resulted in tripping of breakers at Kalivandapattu
----
3
Tripping of 400/220kV ICT-1, 2 and 3 at Somanahalli substation
08-11-2016 at 16:10hrs
Bus bar protection operated at 220kV Somanahalli substation during fault in 220kV Somanahalli-Malur line.
Load loss 700 MW
4
Tripping of Unit#2, 3, and 6 Vijayawada Thermal Power Station (VTPS)
18:31hrs on 08-11-2016
LBB of 220kV bus-2 got operated resulting in tripping all the units and lines connected to bus-2
Gen loss 480MW
GI-2
5
Complete outage of 220 kV Vijayawada TPS of APGENCO
12-11-2016 at 10:26 Hrs
Suspected mal operation of LBB relay of bus coupler resulted in the tripping of bus 1 and bus 2 at 220kV VTPS. All 220kV connected elements of VTPS got tripped
Gen loss 950 MW
GI-2
6
Tripping at 220kV Vizag switching station
14-11-2016 at 9:32 hrs
220kV Bus bar protection got operated at 220 kV VSS due the failure of Y-pole breaker limb of 220kV Gajuwaka feeder.
GI-1
7
Tripping of 400kV Hassan-UPCL line-1&2
14-11-2016 at 18:23 hrs
R-phase to earth fault in Line- 1 and B-phase to earth fault in line-2. Distance protection Main-2 relay at UPCL end sensed R-B-E fault and issued a 3 phase trip
8 Tripping of 400/220kV ICT-2 at Hoody
19-11-2016 at 11:27 hrs
ICT-2 tripped on overload during bus changeover
9 Tripping of HVDC Bhadravati Pole #1
21-11-2016 at 01:14hrs
Pole-1 tripped due to suspected control card mal-operation
GI-2
10
Tripping of 400/220kV ICT-2 at Kurnool (AP)
25-11-2016 at 17:15 hrs
ICT-2 tripped on operation of WTI & OTI trip
Annexure-I
Page 2 of 4
11 Tripping of 400kV Dharmapuri PS-Tuticorin PS line-1
27-11-2016 at 2:55 hrs
line tripped due to due to failure of line reactor B-ph bushing at Dharmapuri Pooling Station end
III. Details of Failure or non-operation of Auto reclose events:
Sl. No.
Element Date & Time Reason
1 Tripping of 400kV Tumkur-Bidadi line
13:01:06 hrs on 01-11-2016
B-phase to earth fault had occurred in line at During 2nd fault it was observed that breaker at Bidadi tripped on Pole discrepancy and at Tumkur end it was a 3 phase trip.
2
Tripping of 220kV Gummudipundi-Sullurupet line
28-11-2016 at 11:54 hrs
line tripped on R-phase to earth fault. Auto reclose was successful at 220kV SS Sullurpeta, however no DR and El were furnished to validate the same. Line did not auto-reclose from Gummidipundi end and relay issued a 3 phase trip.
IV. Trippings due to PLCC mal-operation:
Sl. No.
Element Date & Time Reason
1
Tripping of 400kV Hassan-UPCL line-1
17-11-2016 at 17:23 hrs
line tripped on direct trip receive at Hassan end and line was holding from UPCL. No relay operation at UPCL end.
2
Tripping of 400kV Ramagundam-Gajwel line
18th & 19th Nov 2016 at 10:56 hrs& 9:32 hrs
line tripped at Gawel end only on direct trip receive and was holding from Ramagundam end. There was operation of protection at Ramagundam.
3
Tripping of 400kV N’sagar-Mahboobnagar line
19-11-2016 at 14:46 hrs
line tripped at Mahboobnagar end on DT receive and was holding from N’sagar end
Annexure-I
Page 3 of 4
V. Details of specific Over-voltage trippings:
a) Tripping of 400kV Uruvakonda-Jamalamadugu lines:
SL.NO. ELEMENT NAME TRIPPING DATE
TRIPPING TIME
REMARKS
1 400 kV Uravakonda-Jammalamadugu - 2
29-Nov-16 18:58 line tripped on overvoltage operation at Uruvakonda. DR & EL was not furnished to validate the tripping
2 400 kV Uravakonda-Jammalamadugu - 2
28-Nov-16 13:02 line tripped on overvoltage operation at Uruvakonda. DR & EL was not furnished to validate the tripping
3 400 kV Uravakonda-Jammalamadugu - 1
25-Nov-16 23:45 line tripped on overvoltage operation at Uruvakonda. DR & EL was not furnished to validate the tripping
4 400 kV Uravakonda-Jammalamadugu - 2
18-Nov-16 20:56 line tripped on overvoltage operation at Uruvakonda. DR & EL was not furnished to validate the tripping
5 400 kV Uravakonda-Jammalamadugu - 2
10-Nov-16 23:41 line tripped on overvoltage operation at Uruvakonda. Tripping could not be validated with submitted DR & EL
6 400 kV Uravakonda-Jammalamadugu - 2
09-Nov-16 21:57 line tripped on overvoltage operation at Uruvakonda. Tripping could not be validated with submitted DR & EL
b) Tripping of 400kV Uruvakonda-Mahboobnagar line-2
SL.NO. ELEMENT NAME TRIPPING DATE
TRIPPING TIME
REMARKS
1 400 kV Uravakonda-Mahboobnagar line - 2
18-11-2016 18:26 hrs on line tripped on operation over-voltage protection at Uruvakonda and direct trip was received at Mahboobnagar. Over-voltage tripping could not be validated with the submitted DR of Uruvakonda station.
2 400 kV Uravakonda-Mahboobnagar line - 2
23-Nov-16 23:49
*****
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 05.12.2016
Remarks Latest Status
(To be filled up by
the Constituent)
Pending Implementation of PCSC Recommendations (up to 58th 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
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.
KPTCL Mail recieved on 23-01-2016:
KPTCL is ready with ETL-41 cabinet with NSD-50 type protection
coupler at Alipur end.
APTRANSCO mail received on 24-02-2016:
Protection coupler equipment is ready at Ragulapadu end. Wave trap
errection is pending at Ragulapadu end. To maintain the ground clearenace
structural modification works are going on for errection of wave trap.
APTRANSCO mail dated on 22-06-2016:
Protection coupler equipment is ready at Ragulapadu end. Wave trap
errection works are going on.
APTRANSCO mail dated on 15-11-2016:
Work is under progress. A/R feature will be enabled soon.
Pending42/II/3 Outage at
Regulapadu
station of
APTRANSCO
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.
1. 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.
2. A/R feature to be enabled on Regulapadu – Alipuira 220 kV inter-
state line.
APTRANSCO
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.
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
Annexure-II
Page 1 of 25
58/I/8 (GD) Tripping of 220 kV lines
and ICT’s at 220kV
Chinkampalli substation of
APTRANSCO
22-08-2016 at
3:15 hrs
Failure of B-phase CT had occurred in 220
kV Chinakampalli - Kalikiri feeder at
Chinakampalli end.
(i) APTRANSCO to furnish Equipment failure Report on the CT failure
to PSE&TD division of CEA with a copy marked to SRPC.
(ii) APTRANSCO to provide GPS time synchronization facility at their
220/ 132 kV Chinakampally SS.
APTRANSCO APTRANSCO mail dated on 15-11-2016:
1. Equipment failure report was furnished to CEA by
CE/Transmission/APTRANSCO vide letter no: 662, Dt: 19-09-2016.------
Completed
2. GPS panels are drawn. The associated equipment is under procurement.-
-----Pending.
Pending
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
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.
TSTRANSCO mail dated on 23-09-2016:
Main-2 distance relays replaced with P-444 & DR are made functional
Pending
56/II/13
APTRANSCO 1. SLD furnished vide APTRANSCO mail dated 22-06-2016.
--- Completed.
2. APTRANSCO vide their mail dated 24.02.2016 that 220KV chittoor
substation is a old 220KV substation with single bus operation. Bus bar
protection has both main & checkzone are in service. ----- Pending.
APTRANSCO mail dated on 31-08-2016 & 15-11-2016:
220KV chittoor substation is a old substation with single bus operation.
Both main & checkzone are in service in Bus bar protection. The split bus
operation is not possible as there is place constraint for extension of the
swithyard. (Substation was located at the corner of the site).
Pending
1.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.
APTRANSCO 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.
APTRANSCO mail dated on 15-11-2016:
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.
Pending
For the line under consideration, the following shall be carried out by
TSGENCO in coordination with PGCIL:
I) End-to-end communication for DT/ permissive & other signals may be
ensured by testing at both the ends.
II) Healthiness of PLCC system components (hardware and software) at
both ends shall be checked and faulty components shall be repaired/
replaced.
TSGENCO Yet to be informed PendingLine tripped on R-phase to earth fault. Line
auto - reclosed at Khammam end and did not
auto-reclose at KTPS end due to Direct Trip
receipt.
13-09-2016
at 19:15 hrs
Tripping of 400 kV
Khammam-KTPS line-1
58/III/7
Provision of differential protection for Jurala line 1 & 2 (line length-1.45 KM) feeders at 220 kV Jurala HPS [Carry-Over from Protection Audit Recommendations]
02-06-2016 at
00:41 hrs
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
1.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.
APGENCO/
APTRANSCO
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
Pending55/II/21
Telangana
Multiple tripping at
Vijayawada TPS
(Gen Loss : 750 MW)
50/II/14 Tripping of 220kV Chittoor-
Tiruvalam
18-11-2015 at
11:20 hrs
During testing of DC earth leakage, DC got
extended to bus bar protection relay. Hence
bus bar protection operated and tripped the
220KV BUS connected transformers and
feeders.
1. APTRANSCO to furnish SLD of 220/132 kV Chittoor SS,
2. APTRANSCO to confirm whether 220 kV side is on single-bus
operation with only one main-zone. If so, APTRANSCO shall examine
the feasibility of providing split-bus operation or multiple main-zones for
bus bar protection, and take necessary steps to implement it.
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
Annexure-II
Page 2 of 25
48/III/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
TSTRANSCO to furnish a detailed report on the tripping event along
with remedial measures taken to PCSC forum.
TSTRANSCO TSTRANSCO mail dated on 23-09-2016:
Company Engineer visited Gajwel Substation during 29-08-16 to 07-09-16
and rectified the faulty BCU and checked for correct operation of Auto
Recloser
Pending
51/IV/1 Tripping of 400kV Gajwel-
Hyderabad
29-12-2015 at
6:11 hrs and
7:11 hrs
Line tripped at Gajwel end only due to
suspected PLCC mal-operation at Gajwel
end
TSTRANSCO to check the integrity of all DR’s and EL’s, and sort out
communication related issues at 400 kV Gajwel SS.
TSTRANSCO TSTRANSCO mail dated on 23-09-2016:
Company Engineer visited Gajwel Substation during 29-08-16 to 07-09-16
and configured all the DRs and ELs.
Pending
52/I/6 Complete outage of 220kV
Malyalapalli station of
TSTRANSCO
10-03-2016at
18:41 Hrs
CT failure occurred in 220kV Ramagundam-
Malyalapalli line-1 at Malyalapalli end. The
CT failure resulted into a Bus fault. All
220kV lines and transformers at
Malyalapalli station tripped during the
incident.
TSTRANSCO to furnish the Equipment Failure Report for the R-ph CT
blast to Power System Engg & Technolgy Divison (PSETD) of Central
Electricity Authority with a copy marked to SRPC.
TSTRANSCO TSTRANSCO mail dated on 23-09-2016:
Report is being sent to Central Electricity Authority(CEA) by
TSTRANSCO vide Lr.No.CE(Tr)/ SE(Tr)/DE(SS)/ADE-3/F.Equipment
failure report/D.No.324/16, Dt:17-09-16.
Pending
54/II/2 Tripping of 400kV
Shankarapalli -
Mamidapalli line
04-04-2016 at
00:03 hrs
Y-Phase CT failure had occurred in 400kV
Shankarapalli-Mamidapalli line at
Mamidipally end.
1.TSTRANSCO to revise A/R dead-time on 400 kV Shankarapalli –
Mamidipalli to 1 sec at both ends.
2.TSTRANSCO to furnish Equipment Failure Report of Y-ph CT blast
to CEA with a copy marked to SRPC.
TSTRANSCO TSTRANSCO mail dated on 23-09-2016:
Report is being sent to Central Electricity Authority(CEA) by
TSTRANSCO vide Lr.No.CE(Tr)/ SE(Tr)/DE(SS)/ADE-3/F.Equipment
failure report/D.No.324/16, Dt:17-09-16.
Pending
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
1.TSTRANSCO to revise distance relay settings at Tandur end for Tadur
Sedam S/C line appropriately so that mal-operations due to it are
eliminated.
2.TSTRANSCO to resolve issues in providing DR & EL of Tandur end
relays by 15.08.2016.
TSTRANSCO TSTRANSCO mail dated on 23-09-2016:
Relays are replaced with numerical relays and revised relay settings have
been adopted. Breaker company engineer is called for incorporating Auto
Recloser features in the Breaker.
Pending
56/III/3 Tripping of 400kV
Shankarapalli-Mamidapalli
line-2
03-06-2016 at
20:58 hrs
Line tripped on R-phase to earth fault. Line
did not auto-reclose.
1.TSTRANSCO to take steps to furnish (upload) tripping files
(FIR/DR/EL/TR) for the lines involving their substations in time (within
one day of the occurrence of the tripping event) as per IEGC Regulation
5.2 (r).
2.TSTRANSCO to put A/R into service on 400 kV Shankarapalli –
Mamidipalli line with immediate effect.
TSTRANSCO TSTRANSCO mail dated on 23-09-2016:
As per the Event Loggers at Both ends Auto reclosure acted at both the
ends. Hence event may be deleted.
Pending
Yet to be informedTSTRANSCO07-09-2015 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
Pending TSTRANSCO to furnish a detailed report on the tripping event along
with remedial measures taken to PCSC forum.
Tripping of 400kV
Nagarjunsagar-
Mahboobnagar line
48/II/5
Annexure-II
Page 3 of 25
KPCLThe PCSC forum recommended for replacement of existing
electromechanical relays with Numerical relays. Spl meeting held at RTPS on 13
th and 14
th
March 2014
Mar-14RTPS Tripping incidents
and the Spl meeting held at
RTPS on 13th and 14th
March 2014
30/I/A Pending
Karnataka
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.
Mail recieved on 07-09-2015:
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
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.
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–
Budgetary offers obtained and is under process.
Annexure-II
Page 4 of 25
Pending
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
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.
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.
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 recieved on 28-05-2015:
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.
Mail recieved on 07-07-2015:
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.
Mail recieved on 07-09-2015:
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.
Mail recieved on 21-10-2015:
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.
Mail recieved on 23-11-2015:
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.
KPCLKPCL to check the possibility of providing line differential protection
between RTPS and Yermarus stations.
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
Pending
41/I/1
Tripping of
400/220kV ICT-1 at
BTPS
43/II/14
16-02-2015 at
12:56 hrs
38/GD/3.5
Annexure-II
Page 5 of 25
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
07-06-2015 at
01:35 hrs
Trippings at 220kV Raichur
TPS
Yet to be informed14-04-2016 at
12:29 hrs
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
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
Mail received on 21-10-2015:
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.
Mail recieved on 23-11-2015:
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.
13-04-2016 at
21:12 hrs
Yet to be informed Pending
Pending54/I/4 Tripping of Nagjheri
Generators
Tripping of 400kV Raichur
TPS Bus-2
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
Pending
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).
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.
46/II/21 KPCL
Annexure-II
Page 6 of 25
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.
KPCL Yet to be informed Pending
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.
KPCL Yet to be informed Pending
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.
KPCL Yet to be informed Pending
Pending
Multiple tripping at 400 kV
Raichur TPS Station
Complete outage of 220 kV
Kadra power station of
KPCL
Yet to be informed
Yet to be informed
KPCL Yet to be informed Pending
KPCL Pending
(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 Yet to be informed Pending
01-05-2016 at
21:44 Hrs
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.
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
06-09-2016
at 14:40 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.
54/II/13 15-04-2016 at
15:36 hrs
Tripping of 400kV Bellary
TPS-Yeramarus TPS line
and 400kVYeramarus TPS -
Raichur TPS line
31-05-2016 at
17:21 hrs
Direct Trip was sent from YTPS to RTPS
and BTPS
58/I/3 (GD)
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.
KPCLTripping of Units at Raichur
TPS
During 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
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.
55/II/19
Annexure-II
Page 7 of 25
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.
KPCL Yet to be informed Pending
(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.
KPCL Yet to be informed Pending
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
Sharavathy Tail Race PH
Yet to be informed Pending
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.
Pending1. 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.
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.
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.
9-09-2016 at
11:19 hrs
Spurious operation of LBB protection of line
feeder had led to tripping of 220 kV bus at
Sharavathy Tail Race power house.
12-09-2016 at
14:47 hrs
38/GD/3.1
58/I/5 (GD)
Disturbance in Kerala
system
58/I/6 (GD)
GD-1 at Mahalingapura
Substation of KPTCL
25-10-2014 KPTCL
Annexure-II
Page 8 of 25
GD-1 at 220kV Ambewadi
Station of 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. ---- Completed
Mail recieved on 29-07-2015:
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:
Bus-II PTs yet to be commissioned.Planned to complete before end of
April-2016.
Pending
KPTCL1. 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 was requested to explore the possibility of providing A/R
feature to this line and submit the remedial measures to the PCSC
forum.
Pending
PendingMail 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.
KPTCL mail recieved on 23-01-2016:
Carrier protection is being restored for 220kV Sedam-Tandoor line at
Sedam end. After restoring the carrier protection , AR will be enabled.
KPTCL mail recieved on 25-05-2016:
SEE,SCADA to update the latest status
KPTCL mail recieved on 28-06-2016:
Action is being taken to restore carrier protection.AR will be enabled once
carrier signal is restored.
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.
22-12-2014 at
21:22 hrs
40/IV/1 220kV Sedam-
Tandur line
Line tripped on Yphase to earth fault from
both the ends
20-12-2014
at 22:20 hrs
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:
New C&R panels(with numerical relays) erected for 500MVA ICT-1 &2
under R&M work, which will be commissioned shortly.
KPTCL mail received on 25-05-2016:
New C&R panels(with numerical relays) erected for 500MVA ICT-1 &2
under R&M work, which will be commissioned shortly.
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
39/I/5
KPTCL
40/I/1
Annexure-II
Page 9 of 25
KPTCL
Mail received on 28-04-2015:
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.
Mail received on 29-07-2015:
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 mail received on 23-01-2016:
1. Bus bar protection panels pocured and erected at Sedam. Wiring ,
testing ,commissioning is being taken up.Planned to complete by April
2016.
2. Action is being taken to restore the carrier protection for 220kV Sedam-
Tandoor line. AR will be enabled after restoration of PLCC.
Pending
Pending
PendingYet to be informed
12-03-2015 at
7:51 hrs
KPTCL
PendingMail received on 27-05-2015:
1. Bus Bar protection will be provded under R&U.
2. A/R yet to be enabled.
Mail received on 29-07-2015:
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.
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 to activate non-directional Over Current protection with a time
delay of 600-800 msec for Fuse
failure condition at Lingasugur.
Mail received on 29-07-2015:
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.
47/II/13
15-02-2015 at
14:24 hrs
Complete outage of 220kV
Ambewadi substation of
KPTCL
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.
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.
Complete outage at 220kV
Sedam Substation of
KPTCL (GD-1)
Complete outage of 220kV
Sedam substation of
KPTCL
42/I/1 (GD)
Tripping of Unit-1&2
along with 400/220kV
ICT-2 at Raichur TPS
KPTCL1. 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.
06-08-2015 at
4:51 hrs
Fault in 220kV Ambewadi-Nagjheri line-2
27-01-2015 at
8.00 hrs
Fault occurred in 220kV Sedam-Shahpur line
KPTCL
42/I/2 (GD)
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.
41/I/4
Annexure-II
Page 10 of 25
47/III/8 Tripping of 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.
47/III/10 Tripping of 220kV
Ambewadi-Ponda line-1
08-08-2015 at
10:51
hrs and 09-08-
2015 at
Line tripped on a B-phase to earth fault. Line
tripped as there is no provision for auto-
reclose
47/III/12 Tripping of 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.
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 Yet to be informed Pending
29.10.2015 at
14:34 hrs
Pending
PendingKPTCL
Pending
PendingKPTCL KPTCL Mail received dated 25-05-2016:
SEE, RTC, Bangalore to update the status
KPTCL
Yet to be informed
KPTCL mail received on 25-05-2016:
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.
Yet to be informed
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.
30-09-2015 at
10:41 hrs
KPTCL Mail received dated 25-05-2016:
SEE, RTC, Bangalore to update the status
KPTCL Mail received dated 28-06-2016:
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
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.
KPTCL
KPTCL
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.
KPTCL mail received on 23-01-2016:
Will be complied in a months time.
Pending
Pending
16-03-2016 at
11:39 Hrs
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
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.
48/I/3 (GD)
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.
51/II/21 Multiple tripping at 400kV
Guttur sub-station
17-01-2016 at
18:53 hrs
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.
48/I/2 (GD) Complete outage of 220kV
Peenya Substation in
Karnataka
49/I/1.3 (GD) Complete outage of 220kV
Ambewadi Substation of
KPTCL
53/I/1
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.
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
KPTCL to fast-track providing A/R on all 220 kV lines emanating from
Ambewadi SS to prevent Station shut-down on temporary faults.
Complete outage of 220kV
Peenya Substation of
KPTCL
Outage of 220kV
Ambewadi station in
Karnataka
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.
KPTCL
Annexure-II
Page 11 of 25
55/II/4 Tripping of 400/220kV ICT-
1 & 2 at Hoody substation
27-05-2015 at
08:08 hrs
Triggering incident was failure of newly
erected R and Y phase sectionalizer CT of
220kV North bus at 220kV Hoody SS.
KPTCL to furnish Equipment Failure Report (EFR) CEA with a copy
marked to SRPC.
KPTCL Yet to be informed Pending
56/I/1 Complete outage of
400/220kV Hoody
substation of KPTCL.
02-06-2016 at
4:56 hrs
Bushing of R-phase ICT -2 got failed at
Hoody station at 3:09 hrs. ICT-1&3 and
400kV lines at Hoody substation were hand
KPTCL to furnish Equipment Failure Report (EFR) CEA with a copy
marked to SRPC.
KPTCL Yet to be informed 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
Pending
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.
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 Yet to be informed 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. 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.
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.
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
KPTCL Mail received dated 28-06-2016:
Modifications to be carried in Nagzari SPS logic is submitted to
SRLDC/SRPC for verification and approval
Pending
KPTCL Mail received dated 28-06-2016:
Modifications to be carried in Nagzari SPS logic is submitted to
SRLDC/SRPC for verification and approval
KPCL/ KPTCL
53/II/1
01-07-2016 at
03:03 hrs
Pending
KPCL/KPTCL
KPTCL
57/II/1
KPTCL Mail received dated 25-05-2016:
SEE, RTC, Bangalore to update the status
16-03-2016 at
11:39 Hrs
Tripping of ICT-3 at
Raichur Substation
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.
KPTCL Mail Recieved dated 25-05-2016:
SEE,SCADA to update the status of healthiness of carrier protection of
220kV RTPS-Raichur 1 &2 lines
KPTCL Mail Recieved dated 28-06-2016:
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.
PendingKPCL/ KPTCL to check the ICT’s back-up (high-set) protection
settings, and ensure that they operate with a time delay of 100 msec.
51/I/3
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
53/I/3 (GD)
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.
53/I/1
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.
Complete outage of 220kV
Peenya Substation of
KPTCL
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.
22-02-2016 at
12:36 hrs
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
KPCL/ KPTCLComplete outage of 220kV
Ambewadi station of
KPTCL and 220kV
Nagjheri of KPCL
18-03-2016 at
14:40 hrs
Annexure-II
Page 12 of 25
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
48/I/1 (GD) Pending
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 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:
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 10-11-2016:
230kV Othakalmandapam - Myvadi feeder will be made LILO at Kongal
Nagar. Line restringing will be carried out along with the above proposal.
53/II/1
Tamil Nadu
KPCL/KPTCL
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.
Mail received on 27-04-2016:
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.
Mail received on 10-11-2016:
Different make Relays will be ensured for Main-I & II relays at Alamathy
end.
Pending
Tripping of ICT-3 at
Raichur Substation
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.
KPTCL Mail Recieved dated 25-05-2016:
SEE,SCADA to update the status of healthiness of carrier protection of
220kV RTPS-Raichur 1 &2 lines
KPTCL Mail Recieved dated 28-06-2016:
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.
PendingKPCL/ KPTCL to check the ICT’s back-up (high-set) protection
settings, and ensure that they operate with a time delay of 100 msec.
TANTRANSCOTANTRANSCO was requested to swap the relays between two stations,
so that
Main-1 and Main-2 will be of different make at each station.
29-03-2015 at
15:29 hrs
Tripping of 400kV
Alamathy-
SVChatram line-1&2
and 400/230kV ICT
at S.V.Chatram
TANTRANSCO 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.
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
Disturbance in 220kV
Tamilnadu system
43/II/5
Annexure-II
Page 13 of 25
58 TANTRANSCO 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
14-09-2016 at 11:13Hrs
Bus Bar Protection (Zone-2) of 230 kV Bus-B got operated at Alamathy Station during
fault in 230 kV Alamathy-Korattur feeder.
15-09-2016 at 22:14 hrs
Bus Bar Protection (Zone1) of 230kV Bus-A got operated at Alamathy Station during
fault in 230 kV Alamathy-OPG-1 feeder.
TANTRANSCO Mail received on 19-02-2016 and 24-03-2016:
Revision of Bus Bar Protection setting was carried out. The stabilizing
voltage setting was raised from 410 to 450 volts. After completing the
necessary test, the bus bar protection put in to service on 29.12.2015.
Mail Received on 27-04-2016 ,16-06-2016,25-07-2016 & 24-09-2016:
Revision of Bus Bar Protection setting was carried out. After completing
the necessary test, the bus bar protection put in to service on 29.12.2015.
Mail received on 10-11-2016:
Provision of Bus Coupler bay arrangement was included in the
Upgradation works proposed and the same was sanctioned by MoP through
PSDF.
Numerical relay allotted and being commissioned.
TANTRANSCO1. TANTRANSCO to examine the feasibility of providing two main-
zone operation for bus bar protection by exploring various alternatives
like replacing existing bus-coupler CB with a hybrid bus-coupler CB
that comes with inbuilt CT, replacing existing BBP relay with another
suitable relay that supports two main-zone operation, and implement the
same.
Busbar protection got operated for a fault in
230kV Mywadi-Anaikadavu line
21-12-2015 at
6:28 hrs
Complete outage of 230kV
Mywadi station of
TANTRANSCO
50/I/3 (GD) Pending
Multiple tripping at 230 kV Alamathy Station
58/II/17
Flashover of Auto Transformer- 2 HV
B-phase Isolator supporting insulator of
230kV Southern Bus occurred at
Gummidipoondi station. At the time of fault,
Bus bar protection relay was not in service
for pre-commissioning testing of Auto
Transformer-2. All feeders got tripped due to
operation of zone-2 protection from remote
ends.
Different 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 Sunguvarchathiram Substation [Carry-Over from Protection Audit Recommendations]
TANTRANSCO to check the healthiness of BBP relay by conducting stability test, and take appropriate remedial action like increasing
voltage settings, ensuring the healthiness of CT’s, using CT’s with
similar characteristics (equal saturation effects & equal winding resistances) etc. at their 230 kV Alamathy SS. TANTRANSCO to replace the existing high-impedance BBP relay with
its low-impedance/ numerical variant so as to accommodate variation
in CT characteristics at their 230 kV Alamathy SS.
TANTRANSCO Mail received on 10-11-2016:
The Bus Bar Protection scheme will be tested for healthiness including the
CT circuits.
High impedance BBP relay will be replaced by Numerical relay.
Pending
50/II/17 TANTRANSCO to check the LBB scheme for LV side CB of ICT-3,
and furnish the remedial measures taken to PCSC forum.
400/230kV Myvadi ICT-3 tripped due to the
operation of 230 kV CB LBB protection at
230 KV bus (TNEB) of Myvadi station.
27-11-2015 at
17:26 hrs
Tripping of 400/230kV
Myvadi ICT-3
TANTRANSCO Mail received on 19-02-2016, 24-03-2016 and 27-04-
2016:
LBB scheme will be tested while availing Line Clear.
Mail Received on 20-05-2016 ,16-06-2016,25-07-2016 & 24-09-2016:
Revision of Bus Bar Protection setting was carried out. After completing
the necessary test, the bus bar protection put in to service on 29.12.2015.
Mail received on 10-11-2016:
Numerical BBP relay allotted and being commissioned. LBB scheme will
also be tested alongwith BBP.
Pending
Complete outage of 230 kV
Gummidipoondi Station of
TANTRANSCO
12-05-2016 at
12:15 hrs
Fault had occurred in 230kV Madurai-
Sembatty line. Trip from distance relay was
not extended to breaker due to protection DC
fail. LBB protection got operated resulting in
a busbar trip at 230kV Madurai substation.
All elements got tripped as there is a single
bus operation at 230kV Madurai S/s
1. TANTRANSCO to provide split-bus operation with bus sectionalizer
CB for their 230 kV Madurai (Chekanurani) SS.
2. TANTRANSCO to provide two main-zone operation for the
numerical BBP that is being commissioned.
3. TANTRANSCO to examine the feasibility of providing Re-Trip
feature for the LBB protection, and accordingly take steps for
implementing the same.
TANTRANSCO
TANTRANSCO
TANTRANSCO mail received on 24-03-2016 :
CMR relay for extending LBB protection was released and LBB extended
from Distance Protection relay directly. CT is not available in the Bus
Coupler bay for zone segregation. However, during commissioning of third
ICT, Bus section Breaker will be provided for zone segregation. Numerical
BBP relay will be provided.
Mail recieved on 27-04-2016 and 20-05-2016 ,16-06-2016, 25-07-2016,
24-09-2016 & 10-11-2016:
CT is not available in the Bus Coupler bay for zone segregation. However,
during commissioning of third ICT, Bus section Breaker will be provided
for zone segregation. Numerical BBP relay will be provided.
Pending
Pending
Complete outage of 230kV
Madurai S/s (Chekanaurani)
of TANTRANSCO
51/I/1 (GD) 19-01-2016 at
11:56 hrs
TANTRANSCO to take steps to provide double-bus operation at their
230 kV Gummidipoondi SS.
TANTRANSCO Mail recieved on 25-07-2016 & 24-09-2016:
TANTRANSCO: Auto Transformer-2 HV side Bus isolator 'C'-phase
support insulator of 230kV Southern Bus was replaced and Bus Bar
Protection scheme was restored on 12.05.2016.
Mail received on 10-11-2016:
CT is not available in the Bus Coupler bay for zone segregation. CT latch
relay is to be provided for all bays for zone segregation.
55/I/1 (GD)
Annexure-II
Page 14 of 25
54/II/3 Tripping of 400kV
Sriperambudur -
SV.Chartam and 400kV
Nellore-Sriperambudur line-
1
05-04-2016 at
00:11 hrs
400kV Nellore-Sriperambudur line-1 tripped
on a R-phase to earth fault. 400kV
Sriperambudur-S.V.Chatram line tripped at
Sriperambudur end only on operation of over
current protection
PGCIL (SR-II) to check and revise Pole Discrepancy Relay (PDR) time
setting appropriately based on the type of A/R scheme being
implemented at their 400 kV Sriperambudur SS.
PGCIL (SR-II) Yet to be informed Pending
54/III/3 Tripping of 400 kV
Kalvindapattu-Vallur line
10-04-2016 at
14:59 hrs
R-phase to earth fault had occurred in line.
Auto reclose attempt is unsuccessful/ auto-
reclose could not be established from
provided DR/ EL.
PGCIL (SR-II) to furnish a report on the tripping event detailing the
reasons for unsuccessful A/R operation at Kalvindapattu end, and the
remedial action taken to restore A/R to normalcy.
PGCIL (SR-II) Yet to be informed Pending
23-08-2016
at 11:20 hrs
Triggering incident was conductor snapping
in 110 kV Kalamassery- Kaloor feeder
KSEB to take steps to provide the following at their 220/ 110 kV
Kalamassery SS:
i)Busbar protection at 110 kV level
ii)Connecting 220 kV and 110 kV sides on to a common earthmat
iii)Redundant DC supply for both protection (220 V) and communication
(48 V) applications
iv)Stand-alone Event Logger
KSEB
Yet to be informed
44/I/1 (GD) 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.
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. ---------Pending
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.
Mail recieved on 30-10-2015:
1. Purchase procedures is still in progress.
2. Replaced.
3. PLCC equipment Tested and found OK.
Mail recieved on 03-03-2016:
1. Even though repeated plans to have a joint inspection with M/s.ABB
who is the OEM of the relay panel for replacing the relays with numerical
ones, the same could not become successful. Finally, the inspection has
been fixed on 15.03.2016. It has been planned to replace existing REF
protection with low impedance ones after retrofitting the numerical ones of
OEM.
Mail recieved on 25-05-2016:
1.Generation wing is planning ti provide low impedance REF protection by
retrofitting numerical ABB make transformer management relay in the
existing panel. ---- Pending.
2.Faulty breaker of Unit3 has been replaced. ---- Completed.
3.PLCC equipments in the feeder were checked and found OK. ------
Completed.
Pending
(Recommendat
ion No.1)
Yet to be informed Pending
Pending
Kerala
PGCIL (SR-I & SR-II)
1.PGCIL (SR-I) to properly configure EL’s at Hyderabad station with
time-scale resolution up to msec; further, DR’s should also be configured
for showing both Analog and Digital data with properly defined X-axis
and Y-axis scales.
2.PGCIL (SR-I) to follow the FILE Naming Nomenclature provided by
SRPC in naming various tripping files (FIR/DR/EL/TR) being uploaded
in SRLDC’s Tripping Monitor System (TMS) portal.
Line tripped on operation of over-voltage
protection at Hyderabad end and Direct Trip
was received at N’sagar. Over-voltage, Stg-2
operation was observed in EL of Hyderabad
station.
08-05-2016at
4:57 hrs
Tripping of 400kV
Hyderabad - N’sagar line
55/II/5 PGCIL (SR-I)
Complete outage of Idukki
Hydro Power Station (GD-
1)
28-04-2015 at
12:30 Hrs
58/I/1 (GD) Complete outage of 220 kV
Kalamassery Substation
Annexure-II
Page 15 of 25
Yet to be informed Pending 1.PGCIL (SR-I) to properly configure EL’s at Hyderabad station with
time-scale resolution up to msec; further, DR’s should also be configured
for showing both Analog and Digital data with properly defined X-axis
and Y-axis scales.
2.PGCIL (SR-I) to follow the FILE Naming Nomenclature provided by
SRPC in naming various tripping files (FIR/DR/EL/TR) being uploaded
in SRLDC’s Tripping Monitor System (TMS) portal.
Line tripped on operation of over-voltage
protection at Hyderabad end and Direct Trip
was received at N’sagar. Over-voltage, Stg-2
operation was observed in EL of Hyderabad
station.
08-05-2016at
4:57 hrs
Tripping of 400kV
Hyderabad - N’sagar line
55/II/5 PGCIL (SR-I)
Annexure-II
Page 16 of 25
55/II/9 Tripping of HVDC
Gazuwaka pole-2
19-05-2016 at
11:41 hrs
Pole tripped on operation of differential
current protection of east side of Pole-2
PGCIL (SR-I) to take up the issue of differential protection operation of
converter transformer on low voltage fluctuations with their OEM, and
submit a detailed report on it.
PGCIL (SR-I) Yet to be informed Pending
56/II/11 Tripping of HVDC
GazuwakaPole-2
19-06-2016 at
5:20 Hrs
HVDC Pole-2 got tripped on operation of
Bus differential protection
PGCIL (SR-I) to get the tripping of HVDC Pole-2 tripping on Win-Bus
differential protection thoroughly investigated for correctness of
operation, and submit a report thereon.
PGCIL (SR-I) Yet to be informed Pending
56/III/7 Tripping of 400 kV
Khammam-N’sagar line-1
05-06-2016 at
22:41 hrs
Line tripped on B-phase to earth fault. Line
auto-reclosed successfully at N’sagar and
failed to auto-reclose at Khammam
1.PGCIL (SR-I) to configure DR & EL at N’sagar (Tallapalli) end so
that full operation of A/R is captured.
2.PGCIL (SR-I) to investigate the reasons for non-operation of A/R of
Tie-CB at N’Sagar end, and resolve them suitably.
PGCIL (SR-I) Yet to be informed Pending
58/II/13 (GI) Tripping of 400 kV Raichur-
Gooty line-1 and 400 kV
Gooty-Tumkur line-2
01-09-2016 at
5:17 hrs
400kV Gooty-Raichur line tripped at Gooty
end only and was holding from Raichur.
400kV Gooty-Tumkur line-2 tripped on over
voltage.
PGCIL (SR-I) to check the operation of OVR relays at their Gooty SS,
and properly configure lines’ DRs & ELs so that events pertaining to
OVR (Stage-I & Stage-II) operation (START & TRIP) get explicitly
recorded.
PGCIL (SR-I) Yet to be informed Pending
58/II/14 (GI) Tripping of 400 kV Gooty-
Tumkur line-2
02-09-2016 at
21:56 hrs
Line tripped on operation of over-voltage
protection at Gooty end and Direct Trip was
received at Tumkur
PGCIL (SR-I) to check the operation of OVR relays at their Gooty SS,
and properly configure lines’ DRs & ELs so that events pertaining to
OVR (Stage-I & Stage-II) operation (START & TRIP) get explicitly
recorded.
PGCIL (SR-I) Yet to be informed Pending
55/II/7 Tripping of 400kV Kudgi
PG (Narendra New) -
Narendra-PG line-2
18-05-2016 at
16:25 hrs
line tripped on B-phase to earth fault and line
auto-reclosed successfully from Narendra
end. Line tripped from Kudgi-PG due to
operation of over-voltage stage-1
PGCIL (SR-II) to properly configure dead-time of A/R (typically 1 sec)
on all lines emanating from Narendra (PG) substation.
PGCIL (SR-II) Yet to be informed Pending
55/II/17 Tripping of HVDC Talcher-
Kolar pole-1
30-05-2016 at
09:49 Hrs.
Failure of main CT of AC filter (20C08A)
occurred and it in turn caused the operation
of filter bank differential protection. HVDC
Pole-1 got tripped on group Differential
protection operation
PGCIL (SR-II) to take up the issue of Pole-1 tripping on Group
Differential Protection (Stage-II) due to multiple commutation failures
with their OEM, and furnish a report on it.
PGCIL (SR-II) Yet to be informed Pending
56/II/8 Tripping of HVDC Talcher-
Kolar Pole-1
17-06-2016 at
16:35 Hrs
Talcher-Kolar HVDC Pole-1 got tripped on
line fault and Pole-2 went to ground return
mode with 150MW
PGCIL (SR-II) to address & resolve DTPC and fibre-optic link related
issues raised by KSEB at Thrissur/ Madakathara substations, and
conduct a mock-test in coordination with KSEB to verify integrity of
signal transmission from Kolar to Thrissur/ Makadathara.
PGCIL (SR-II) Yet to be informed Pending
58/IV/1 For the line under consideration, the following shall be carried out by
PGCIL (SR-I) in coordination with NTPC-Ramagundam:
I)End-to-end communication for DT/ permissive & other signals may
be ensured by testing at both the ends.
II)Healthiness of PLCC system components (hardware and software) at
both ends shall be checked and faulty components shall be repaired/
replaced.
PGCIL (SR-I) Yet to be informed PendingLine tripped on Direct Trip receipt at
Ramagundam end and line was holding
from Warangal end.
12-09-2016 at
12:03 hrs
Tripping of 400 kV
Ramagundam-Warangal
line
03-07-2016 at
03:06 hrs
400kV Mywady- Madurai line tripped on a Y-
phase to earth fault due to agriculture fire.
Tie-CB LBB relay got operated at Mywady
end and resulted in tripping of Main
breakers of 400kV Mywady-Madurai and 400kV Mywady-Salem line-1 which are in
the same diameter.
PGCIL (SR-II) to furnish a report on the remedial action taken after
ascertaining the reasons for (i) non-opening of Main-CB of Mywady –
Madurai line at Mywady end on Tie-CB LBB operation, and (ii) delay in
sending DT to the remote ends after Tie-CB LBB operation.
PGCIL (SR-II) Yet to be informed Pending57/II/2 Tripping of 400 kV Mywady-
Salem line-1 and 400 kV
Mywady-Madurai line
Annexure-II
Page 17 of 25
58/II/3 (GI) Tripping of 400 kV Sriperambudur-SV.Chatram line
14-08-2016 at 13:49 hrs
Line tripped at Sriperambudur end only on operation of directional earth fault protection
(i) PGCIL (SR-II) to disable high-set of line DEFR’s, and (ii) PGCIL (SR-II) to block line DEFR operation when DPR is in active condition (has picked up) at their Sriperambudur SS.
PGCIL (SR-II) Yet to be informed Pending
58/II/5 (GI) Tripping of 400 kV Neyveli
TS2-Pugalur line and 400 kV
Neyveli TS2-Neyveli TS2
EXP line
21-08-2016 at
10:35 hrs
Failure of Y-Ph tension insulator of tie
feeder bay at Neyveli TS2. Neyveli-Pugalur
line tripped due to over voltage at Neyveli
TS2 and direct trip was received at Pugalur.
PGCIL (SR-II) to check the operation of the DPR relays at Pugalur end
NLC TS2 - Pugalur line by trans-playing the event on another healthy
relay, and take suitable action including replacement of the relay
accordingly.
PGCIL (SR-II) Yet to be informed Pending
58/II/19 (GI) Tripping of 400 kV Madurai-
Karaikudi line
15-09-2016 at
03:02hrs
Line tripped on operation of OVR, Stage-I
protection at Karaikudi and Direct Trip was
received at Madurai
PGCIL (SR-II) to check the operation of OVR relays at their 400 kV
Karaikudi SS, and properly configure lines’ DRs & ELs so that events
pertaining to OVR (Stage-I & Stage-II) protection operation (START &
TRIP) get explicitly recorded.
PGCIL (SR-II) Yet to be informed Pending
58/II/16 (GI) Multiple tripping at 400 kV
Kalpaka SS
06-09-2016 at
16:43 Hrs
Y-Pole breaker of Bus reactor-3 got failed
during its charging. This resulted in a bus
fault in 400kV bus-1 resulting in tripping of
400kV elements connected to Bus-1
PGCIL (SR-I) & PGCIL (SR-II) to review their Reverse Zone settings of
distance relays so as to bring them in line with Ramakrishna
Committee guidelines at all their substations in the southern region.
PGCIL (SR-I) & PGCIL
(SR-II)
Yet to be informed Pending
NTECLNTECL, Vallur to furnish a report detailing the reasons for mal-
operation of Vallur end relays for a fault on Alamathy-Tiruvalam line-1,
and remedial measures taken to PCSC forum. In the report, their
preparedness for implementing line differential protection on Vallur-
Alamathy lines may also be indicated.
TANTRANSCO mail received on 24-03-2016:
3Ф Trip at 400kV Alamathy end due to DT received from vallur end for
BФ LAS bursted in Alamathy -Thiruvalam - 1 # at Alamathy end.
Mail received on 27-04-2016 and 20-05-2016:
3Ф Trip at 400kV Alamathy end due to DT received from vallur end for
BФ LAS bursted in Alamathy -Thiruvalam - Line-1 at Alamathy end.
Pending51/II/4 400kV Vallur-Alamathy Line-2 got tripped
from Vallur end during failure of Y-phase
LA in 400kV Alamathy-Tiruvalam line.
Protection at Vallur end tried for an auto-
reclose and gave a 3 phase trip.
13-12-2015 at
22:42 hrs
Others
Tripping of 400kV
Alamathy-Tiruvalam line-1
and 400kV Alamathy-
Vallur line-2
Annexure-II
Page 18 of 25
56/III/5 Tripping of 400 kV Neyveli
TS-2-Pugalur line
04-06-2016 at
16:36 hrs
B phase to earth fault occurred in line. Auto-
reclose had not operated at NLC TS-2 and
DT was sent to Pugalur end resulting in a 3
phase trip
NLC to review the necessity of providing Relay Definitive Trip, and
accordingly take steps to disable it on all lines emanating from their
generating stations.
NLC Yet to be informed Pending
56/II/16 Tripping of 400 kV Gajwel-
Singareni line-2
30.06.2016 at
23:43 hrs
Tripped on 3-phase Trip at Gajwel end SCCL to configure Jaipur end relay’s EL properly so that the time-stamp
resolution is extended downwards up to milli-second level.
SCCL Yet to be informed Pending
Pending
1.Singareni TPS to furnish single line diagram of their switchyard along
with the Over Voltage Relay settings adopted for various transmission
lines, and to ensure that they are in line with the SRPC provided
gradings.
2.Singareni TPS to upload various tripping files (FIR/DR/EL/TR)
pertaining to a tripping event involving their station in SRLDC web-
portal within 24-hrs of occurrence of that event in compliance of IEGC
Regulation 5.2(r).
Line tripped on operation of Over-Voltage
protection at Singareni and Direct Trip was
received at Gajwel. DR & EL of Singareni
was not furnished
SCCL10-07-2016 at
1:56 hrs
Yet to be informed Pending
Yet to be informed
02-04-2016 at
17:08 hrs
B-phase CT failure occurred in 230 kV
S.P.Koil - MAPS line-1. Busbar protection
got operated at SP.Koil station. All elements
except 230kV Oragadam and 230kV
Kalivandapattu got tripped at 230kV
S.P.Koil station. ‘Y’ phase CT and support
insulators also got damaged.
1.MAPS to furnish a detailed report on the tripping of SP Koil – MAPS lines 1 & 2 at MAPS end with focus on the correctness of the settings of Main-I & Main-II relays (for primary & back-up protections) on both the lines.
2.MAPS to take steps to provide down-loading facility for DR & EL
from Main-I & Main-II relays on all 230 kV lines emanating from
MAPS.
3.MAPS, in co-ordination with SP Koil, to carry out PLCC end-to-end
testing, on SP Koil – MAPS lines 1 & 2, and ensure healthiness of PLCC
communication & carrier-aided protection.
4.MAPS to put in service Auto-Reclosure feature on all four 230 kV
lines emanating from MAPS by June, 2016.
57/II/8 Tripping of 400 kV
Ramagundam - Dichipally
line
16-07-2016 at
4:38 hrs
Line tripped at Ramagundam end on
operation of over-voltage protection.
Dichipally end tripped due to receipt of
Direct Trip signal.
1.NTPC-Ramagundam to ensure correctness of operation of Over
Voltage relays by taking remedial measures like maintaining healthiness
of concerned CVT’s, setting drop-off to pick-up ratio at 0.97 & above,
etc.
2.NTPC-Ramagundam to ensure time sync of their station’s DR & EL
with GPS.
3.NTPC-Ramagundam to sort out analog values indication &
overlapping issue of time-stamp in their station DR’s.
4.NTPC-Ramagundam to properly configure their EL’s so that events
are recorded with msec. resolution.
NTPC (Ramagundam) Pending
NPCIL (MAPS) Yet to be informed
Tripping of 400 kV Gajwel-
Singareni line-2
57/II/4
54/I/1 Complete outage of 230 kV
S.P.Koil Station of
TANTRANSCO
Annexure-II
Page 19 of 25
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.
As reported directional over current relay of
ICT’s operated due to snapping of line
jumper in 220kV Lingapur line.
Pending (with
KPCL)
Pending
(with KPTCL)
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.
1. Yet to be informed by KPCL. ---- Pending
2. 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. -- Complied with
3.
PGCIL mail recieved on 27-04-2016:
End to end PLCC tunning carried out.
PGCIL (SR-I) RVMD 14.07.2016:
Relay settings of all the stations in SRTS-1 were derived as per
Ramakrishna Commettee recomendations and implemented. - Complied
with.
16-07-2014 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
KPTCL Mail recieved on 23-01-2016:
Detailed estimate prepared for taking up the work. CEE, Transmission
Zone, Gulbarga will take up necessary procurement and further execution.
----------------------------------------------------------------------
1. Pending from KPTCL side.
2. Complied with as per PGCIL (SR-I) RVMD 14.07.2016, which stated
that "Relay settings of all the stations in SRTS-1 were derived as per
Ramakrishna Commettee recomendations and implemented."
3. Pending from KPTCL side.
KPTCL/
PGCIL (SR-I)
Miscellaneous
Mail recieved on 28-04-2015:
End to end testing of PLCC has been done and problem in the PLCC is
atttended.
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 discrepancy in the relay operation is to be checked jointly.
Mail recieved on 02-09-2015 from PGCIL (SR-II):
Problem is in identification of phases at Talguppa end. To be rectified by
M/s KPTCL.
Mail recieved on 28-06-2016 from KPTCL:
The matter is reffered to the concerned Operation and maintance wing to
set right the mismatch of phases in 400kV Talaguppa-Nelamangala and
Talaguppa-Shantigrma lines at Talaguppa in cordination with PGCIL .
Pending
(with KPTCL)
KPCL/
TSTRANSCO/
PGCIL (SR-I)
40/II/3 Tripping of 400
kV TALAGUPPA
– HASSAN line
01-01-2015 at
13:38 hrs
On account of R-phase to earth fault, line
tripped at Hassan end due to operation of
distance Zone-2 and non-receipt of carrier.
From D.R of Talaguppa end it is observed
that fault had occurred in Yphase.
1. PGCIL and KPTCL to ascertain the reason for the phase discrepancy
in the relay operation and take suitable remedial measures.
2. KPTCL to check the PLCC operation at Talaguppa end and submit the
report to the PCSC forum.
09-03-2015 at
06:36 hrs
Multiple tripping at Raichur
TPS of
KPCL
42/II/18 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
PGCIL (SR-II)/ KPTCL
34/I/6 400/220 kV ICT-1 & 2 at
MUNIRABAD
Annexure-II
Page 20 of 25
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
Krishnapatnam
24-05-2015
at 19:17 hrs
Generator Protection operated
Tripping of Unit-8 at RTPS 24-05-2015
at 19:19 hrs
Tripped on Overvoltage.
44/I/3 1. All Tripped units, viz., Krishnapatinam, MEPL, Raichur, NCTPS to
submit a detailed report on this event including the remedial measures
taken to PCSC forum.
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
47/I/2 Complete outage of
Krishnapatnam 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)
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 had
implemented 2 seconds delay for under voltage tripping of all Drag Chain
Feeder Conveyors. And this has been done for both the Units.
APGENCO letter dated 18.03.2016:
The unit not tripped on Generator protection but tripped on Economiser
inlet flow protection consequent to tripping of TDBFP on lube oil pressure
low.Before tripping , dip in voltage was observed in the LT system which
caused tripping od lube oil pumps.After the incident,Changeover scheme on
under voltage of LT System was reduced from 80% with 2 sec delay to
40% with 200msec delay
Pending (with
KPCL,
APGENCO)
APGENCO letter dated 18.03.2016:
1.SOE and SLD are attached. The DR of 405 CB is not generated during
the incident. Now the problem is identified and rectified.
--------- Completed
2.All the 3 lines i.e CHTR-2, MNBL-I & II tripped in zone
protection. The fault was in Blind zone i.e P2 side of CT, where it was
covered under Bus fault by the time fault moved on to P1 side when the
fault comes under STUB/TEED zone after 330msec all the feeders expect
CHTR-1 tripped in Zone-II and total fault persisted for 500msec before the
405 TIE CB opens and clear the fault. As a remedial the STUB protection
operation also checked and found OK.-------Completed
3.The Time Sync was missed on the day and found there was problem with
LAN Timer same was rectified. Now found OK.
-----------Completed
4.Now the DR Time scale changed to 1 sec for Pre fault and 3 sec for Post
fault and STATE of events are corrected wherever found wrong/or
misguiding during analysis.---------Completed.
5.
PGCIL-SR1 RVMD 27-04-2016:
Procurement of differential protection for 400kV NPS-NLR D/C and
400kV RCR-RTPS-D/C is under tendering.
PGCIL-SR1 RVMD 14-07-2016:
The proposal for procurement of Line differential Protections for 400kV
Raichur - RTPS-1 & 2 and 400kV Nellore - NPS - 1 & 2 lines has been
approved and tender is under technical evaluation
Pending with
PGCIL(SR-I)
Annexure-II
Page 21 of 25
50/II/11 Tripping of 400kV Neyveli
TS2-Pugalur line
14-11-2015 at
4:01 hrs
Line tripped on operation of over voltage
protection at Pugalur end. However from DR
it was observed that the voltages were below
the O/v stg-1 threshold limits
1. NLC to configure DT receipt event from Pugalur for triggering DR
and EL at NLC TPS II.
2. PGCIL (SR-II) to check drop-off to pick-up ratio of OVR relay at
Pugalur and configure its operation as per SRPC provided OVR
gradings.
PGCIL (SR-II)/
NLC
NLC mail received on 25-03-2016 and 27-04-2016:
Recommended configuration of DR/EL will be done during shut down of
feeder
NLC mail dated on 25-06-2016:
Scheduled to take up the activity on 30.06.2016
Pending
31-07-2015 at
11:44 hrs
Tripping of 220kV Kadra-
Karwar lines - 1&2 and
220kV Kaiga-Kadra line
KPTCL/ KPCL/ NPCIL
(KAPS)
PGCIL (SR-I) / KPTCL 1.
PGCIL RVMD 27.04.2016:
A/R blocked due to failure of PLCC link. The defective PLCCcards
replaced at Neelamgala end.
PGCIL RVMD 14.07.2016:
A/R blocked due to failure of PLCC link. The defective PLCCcards
replaced at Neelamgala end. End to end testing of PLCC carried out and
PLCC link is healthy. ------ Pending
2. Gooty end Time syc unit is replaced with new one and commissioned. ----
---- Completed.
3. Yet to be informed by KPTCL. --- Pending
PendingR-phase to earth fault had occurred in Line.
Line did not auto-reclose from both ends. It
was mentioned that Y&B pole breakers at
Neelamangala tripped on operation of pole
discrepancy and backup impedence
protection for line reactor got operated.
12-11-2015 at
00:20 hrs
47/II/7
50/II/8 Tripping of 400kV Gooty-
Nelamangala line
Mail recieved on 25-05-2016 from KPTCL:
Availability of week end infeed with eco feature to be confirmed by
SEE,RTC,Hubli----Completed
Mail recieved on 03-12-2016 from NPCIL(KGS):
a.The 200 ms Definite time DEFR element in both Kaiga Kadra and Kaiga
Kodasally lines were disabled. IDMT DEFR is retained .
b. the 200 ms Definite time back up o/c element in both Kaiga Kadra and
Kaiga Kodasally lines were disabled. IDMT is retained. ------ Completed.
Pending1. 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.
Complete outage of TPCIL
power station
50/I/2
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. For Gooty –Nelamangala line, PGCIL (SR-I) and KPTCL to provide
3-ph trip logic at their respective ends upon detection of PLCC link
failure during dead-time of A/R operation.
2. PGCIL (SR-I) to make GPS functional at Gooty SS, and ensure time-
sync of various DR’s and EL’s with it (GPS).
3. PGCIL (SR-I) /KPTCL to furnish reason for the operation of Backup
impedance protection of the line reactor at Nelamangala end and the
remedial measures taken to PCSC forum.
PGCIL (SR-I) mail received on 27-04-2016:
1. The firmware of REL670 is being upgraded. ------- Completed.
2. The recording of events in msec interval is being taken up with OEM.
Henceforth, for analysis purpose, we will provide larm list which has msec
time stamp. -------- Completed.
3. End to end testing of PLCC code transmision and tuning of channels
carried out. ------- Completed.
4. Procurement of differential protection for 400kV NPS-NLR D/C and
400kV RCR-RTPS-D/C is under tendering. The legends modified in
Event/alarm list. Provision of diff. rel;ay for all short lines emanating from
NPS is being taken up with our corporate. -------- Pending.
PGCIL-SR1 RVMD 14-07-2016:
The proposal for procurement of Line differential Protections for 400kV
Raichur - RTPS-1 & 2 and 400kV Nellore - NPS - 1 & 2 lines has been
approved and tender is under technical evaluation
PendingPGCIL (SR-I),
MEPL, SEL, TPCIL,
NCC
1.PGCIL (SR-I) to furnish Action Taken Report on the findings of OEM
on relay mal-operation at NPS end on 400 kV NPS – NCCK line to
PCSC forum.
2. PGCIL (SR-I) to appropriately configure Station Event Logger at NPS
to record events at msec interval.
3. PGCIL (SR-I) to carry out PLCC end-to-end testing in coordination
with TPCIL for 400 kV NPS –TPCIL line.
4.PGCIL (SR-I), MEPL, SEL, TPCIL & NCC to take steps to provide
line differential protection at their respective ends on all 400 kV lines
(except Gooty line) emanating from Nellore Pooling Station, and furnish
an action plan to implement the same.
Running units at Thermal Powertech power
Station tripped due to tripping of 400kV
Nellore pooling station (NPS)-TPCIL line
and 400kV Nellore pooling station (NPS)-
ECC line
30-12-2015 at
06:02hrs
Annexure-II
Page 22 of 25
52/I/8 Complete outage of 400kV
NTPL station and CEPL
Stations
14-03-2016 at
01:36 hrs
Running Units at NTPL and Coastal Energen
power station got tripped due to tripping of
evacuating lines.
NTPL and PGCIL (SR-II) to furnish compliance report of the
recommendations given by PSAG-15 Committee that held its meeting on
12-13 April, 2016 at NTPL, Tuticorin.
PGCIL (SR-II)/
NTPL
NTPL mail received on 19.05.2016:
All General Recommendations will be done in the second week of June
2016 ---------- Complied by NTPL.
Yet to be informed by PGCIL (SR-II)
Pending
[with PGCIL
(SR-II)]
53/I/5 1. KPTCL to configure the Auto-Reclosure (A/R) scheme at Hoody
end for all lines emanating from Hoody end in such a way that in the
event of occurrence of faults during A/R dead-time, (i) it should
immediately give a 3-ph trip, and (ii) A/R should go into lock-out state,
i.e., it must not reclose after the elapse of dead-time of A/R.
2. As regards over-reaching of Kolar and Nelamangala end relays for
the fault on 400 kV Hoody – Kolar line-2, KPTCL and PGCIL (SR-II)
are recommended to modify the Z1B settings of the relays used
(7SA522) suitably so that they operate with a Zone-2 time delay.
3. KPTCL to check the ICT’s back-up (high-set) protection settings,
and ensure that they operate with a time delay of 100 msec.
4. KPTCL to take steps to replace the solid state relays at Hoody end
on Hoody-Nelamangala lines – 1 & 2 with numerical relays at the
earliest.
KPTCL/
PGCIL (SR-II)
KPTCL Mail recieved dated 25-05-2016:
1. Incorporated. --- Completed.
2. Yet to be informed.
3. With the existing electromechanical relays, it's not possible to add time
delay of 100 mSec. However, ongoing R&M works of Hoody included
complete ICT1 and ICT2 panel replacement having Numerical relays.
4.The solid state relays of Nelamangala-1 and Nelamangala-2 lines will be
replaced by numerical relays for which relays have been identified,Will be
attended in a month's time.
KPTCL Mail recieved dated 28-06-2016:
2. Clarification sought from OEM regarding Z1B settings,PSB settings to
be adopted in Seimens make distance relays. 3. ICT back up
(high set settings are verified and found to be in order. --- Completed.
4.At Hoody, Solid state relays of 400kV Nelamangala 1 &2 lines are
replaced by numerical relays. Now 400kV Nelamangala 1& 2 lines are
provided with ABB, REL 670 and Micom P442 relays. --- Completed.
Pending only
point 2
54/IV/2 For the line under consideration, the following shall be carried out by
TSTRANSCO and PGCL (SR-I) in co-ordination:
i.End-to-end communication for DT/ permissive & other signals may be
ensured by testing at both the ends.
ii.Healthiness of PLCC system components (hardware and software) at
both ends shall be checked and faulty components shall be repaired/
replaced.
Line tripped at Mamidipally end only on
Direct Trip receipt from Ghanapur end
30-04-2016 at
16:40 hrs
Tripping of 400kV
Ghanapur-Mamidapalli line
PGCIL (SR-I)/
TSTRANSCO
Yet to be informed
26-03-2016 at
12:42 hrs
Complete outage of 400kV
Hoody substation of
KPTCL
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
KPTCL and TSTRANSCO to take steps to provide A/R feature on 220
kV Sedam – Tandur inter-state line at their respective ends at the
earliest.
KPTCL/
TSTRANSCO
Yet to be informed Pending
Tripping of 400kV
Sattenapalli-Vijayawada
line
51/II/6 Pending
Pending
400kV Hoody-Nelamangala line-1&2,
400kV Hoody-Kolar line-1&2, 400/220kV
ICT-2 at Hoody tripped during the incident.
ICT-1&3 were hand tripped after the
incident.
PGCIL mail received on 27-04-2016:
Being pursued with APTRANSCO
APTRANSCO mail dated on 22-06-2016:
AS maintenance being carrired out by PGCIL(SR-1), the required relay
replacement (wiring/programming) may also be carried out by PGCIL(SR-
1).
PGCIL RVMD 14.07.2016:
1. The CB problem has been attended by POWERGRID by using OEM
M/s BHEL services & POWERGRID's O&M spares.
------ Completed.
2. Being pursued with APTRANSCO to replace the faulty Event Logger at
Vijayawada (Nunna) SS. -------- Pending
APTRANSCO mail dated on 31-08-2016:
As maintenance being carrired out by PGCIL(SR-1), the required relay
replacement (wiring/programming) may also be carried out by PGCIL(SR-
1).
PGCIL (SR-I)/
APTRANSCO
1. PGCIL (SR-I), in co-ordination with APTRANSCO, to address the
problem with CB at the earliest opportune time.
2. APTRANSCO to take steps to replace the faulty Event Logger at
Vijayawada (Nunna) SS.
Line tripped due to operation of over voltage
protection at Vijayawada end and Direct Trip
was received at Sattenapalli end
25-12-2015 at
3:01 hrs
Annexure-II
Page 23 of 25
56/III/4 Tripping of 220 kV Sedam-
Tandur line
03-06-2016 at
21:52 hrs
Line tripped on B-phase to earth fault. Auto-
reclose is not enabled for line.
KPTCL and TSTRANSCO to fast-track providing A/R on 220 kV
Sedam – Tandur line, and furnish an action plan of providing the same
by next PCSC meeting (PCSC-57).
KPTCL/
TSTRANSCO
Yet to be informed Pending
56/II/16 1.TSTRANSCO and SCCL to check drop-off to pick-up ratio of OV
relay and ensure that it is kept at 0.97 & above.
2.TSTRANSCO and SCCL to configure respective end ‘s DR & EL so
that they get triggered on OVR protection, and record relevant events.
3.SCCL to configure Jaipur end relay’s EL properly so that the time-
stamp resolution is extended downwards up to milli-second level.
TSTRANSCO/
SCCL
Yet to be informed PendingTripped on 3-phase Trip at Gajwel end30.06.2016 at
23:43 hrs
Tripping of 400 kV Gajwel-
Singareni line-2
Annexure-II
Page 24 of 25
58/II/16 Multiple tripping at 400 kV
Kalpaka SS
06-09-2016 at
16:43 Hrs
Y-Pole breaker of Bus reactor-3 got failed
during its charging. This resulted in a bus
fault in 400kV bus-1 resulting in tripping of
400kV elements connected to Bus-1
APTRANSCO, NTPC-Simhadri, Hinduja TPS and PGCIL (SR-I) to
furnish a compliance report w.r.t. implementation of PSAG-17
recommendations.
APTRANSCO/ Hinduja
/NTPC -Simhadri
APTRANSCO mail dated on 15-11-2016:
1. The issue regarding breaker was addressed to the company.
2. Regarding providing of line differential protection the issue was
addressed to the concerned field engineers.
Pending
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.
PGCIL (SR-I), TPCIL, MEPL, SEL, SGPL, APTRANSCO, APGENCO
and SDSTPS to implement line differential protection on all 400 kV
transmission lines (of length less than 50 km) emanating from Nellore
PS, Nellore (PG) SS, and Nellore (AP) SS. [It may be noted here that the
cut-off length of 50 km has been specified with a view to exclude only
long transmission lines].
APGENCO/ PGCIL(SR-
I)/ TPCIL/MEPL/
SEL/SGPL/
APTRANSCO
Yet to be informed Pending
57/II/6 Tripping of 400 kV
Ramagundam-Malkaram
line
12-07-2016 at
00:13 hrs
Line tripped on operation of overvoltage
protection at Malkaram and Direct Trip was
received at Ramagundam. Over-voltage
operation was observed in EL of Malkaram.
DR not furnished.
1.NTPC-Ramagundam to ensure time sync of their station’s DR & EL
with GPS.
2.NTPC-Ramagundam to sort out overlapping issue of time-stamp in
their station DR’s.
3.TSTRANSCO to set right OVR, Stage-I protection issues at their 400
kV Malakaram SS by taking suitable remedial action.
NTPC/
TSTRANSCO
TSTRANSCO mail dated on 23-09-2016:
1) As on 09-09-2016 the external Over Voltage relay is used for Over
Voltage protection. During the testing it is observed faulty. Over Voltage
function available in Main-I P-444 relay is utilized duly configuring DRs
& ELs.
2) As suggested in PCSC 57th meeting, the CVT Voltages are measured
and found normal and healthy.
Pending
56/IV/2 For the line under consideration, the following shall be carried out by
APGENCO in coordination with TSTRANSCO:
1.End-to-end communication for DT/ permissive & other signals may be
ensured by testing at both the ends.
2.Healthiness of PLCC system components (hardware and software) at
both ends shall be checked and faulty components shall be repaired/
replaced.
APGENCO/
TSTRANSCO
Yet to be informed PendingDirect Trip was received at VTPS and line
was holding from Suryapet end
13-06-2016 at
16:55 hrs
Tripping of 400 kV VTPS-
Suryapet line
57/I/1 Complete outage of 220 kV
Karwar Substation of
KPTCL
12-07-2017 at
11:36 hrs
Triggering incident was failure of R phase
PT in Bus-1 at 220kV Karwar substation.
220kV Kaiga-Kodasalli tripped during the
incident. Also bus shut down occurred at
Kadra and Kodasally stations.
1.NPCIL (KAPS) to disable DefiniteTime O/C relay, and put in its place
by IDMT O/C relay for backup protection on both 220 kV Kaiga –
Kadra line and 220 kV Kaiga – Kodasalli line at Kaiga end.
2.KPTCL to put bus bar protection in service at their 220 kV Karwar SS
at the earliest.
3.KPCL/ KPTCL to implement Weak In-feed Logic with Echo feature
enabled by Under Voltage (27) element on Kadra – Karwar lines 1 & 2.
4.KPTCL to furnish equipment failure report of the current incident to
PSE&TD Division of CEA with a copy marked to SRPC.
KPTCL/ KPCL/ NPCIL
(KAPS)
NPCIL(KGS) mail dated on 03-12-2016:
A.The 200 ms Definite time DEFR element in both Kaiga Kadra and
Kaiga Kodasally lines were disabled. IDMT DEFR is retained .
B. The 200 ms Definite time back up o/c element in both Kaiga Kadra and
Kaiga Kodasally lines were disabled. IDMT is retained.
------Completed
Pending
Annexure-II
Page 25 of 25
Sl.No. Element NameOutage
date/time
Revival
date/time
Reason for
OutageSender/ Receiver
Remedial Measures/ Actions
taken
1 220 kV SABARGIRI - THENI03-09-
2016/10:21:00
03-09-
2016/10:48:00EARTH FAULT KSEB/ TANTRANSCO
TANTRANSCO: Temporary fault.
Both Main-1 & 2 at Theni end
sensed the fault (B-E, Zone-2) and
executed trip. AR lockout at Theni
end.
KSEB: On 03.09.16, no indications
in Main I & Main ll relays.
Directional Earth fault relay
operated- B - Earth. The fault is
appeared to be a hlgh resistance
fault' Because both fault current
and voltage dip are low during
fault.( fault record
attached) . Normal tripping.
2 400 Kv KAYATHAR - KARAIKUDI -120-09-
2016/12:10:00
20-09-
2016/12:49:00
R PHASE TO
GROUND FAULTTANTRANSCO/PGCIL
TANTRANSCO: Temporary fault.
Auto Reclosed in the first
instance. Subsequent R-E Fault
during reclaim time, hence feeder
tripped.
PGCIL:
3 400 Kv KUDGI- KOLHAPUR-201-10-
2016/16:46:00
01-10-
2016/22:44:00
DT RECEIVED @
KUDGI ENDPGCIL(SR-II)/PGCIL(WR-I)
PGCIL (SR-II): DT recd( Due to OV)
from other End.
4 400 Kv KRISHNAPATNAM - CHITTOOR02-10-
2016/23:43:0003-10-2016/
TRIPPED ON R-PH
FAULTAPGENCO/APTRANSCO
APTRANSCO: Feeder was tripped
at 400kV SS Chittoor end on Zone-
1,R-ph to ground fault.
5 400 kV KAIGA - GUTTUR 210-10-
2016/04:05:00
10-10-
2016/04:40:00
B PHASE TO
GROUND FAULTNPCIL/KPTCL To-be-discussed
Pending Remedial Measures/ Actions taken
for the Critical Tripping Incidents (as on 05.12.2016)
Annexure-III
Page 1 of 6
6 220 kV SEDAM - TANDUR10-10-
2016/10:55:00
10-10-
2016/11:40:00
SUSPECTED
MALOPERATIONKPTCL/TSTRANSCO
TSTRANSCO : Line did not trip at
Tandur end. It is suspected
spurious tripping of Breaker at
Sedam end.
7 220 kV SEDAM - TANDUR11-10-
2016/10:20:00
11-10-
2016/11:57:00
SUSPECTED
MALOPERATIONKPTCL/TSTRANSCO
TSTRANSCO : Line did not trip at
Tandur end. It is suspected
spurious tripping of Breaker at
Sedam end.
8 220 kV SEDAM - TANDUR12-10-
2016/08:55:00
12-10-
2016/16:15:00MALOPERATION KPTCL/TSTRANSCO
TSTRANSCO : Line did not trip at
Tandur end. It is suspected
spurious tripping of Breaker at
Sedam end.
9 400 kV KAIGA - GUTTUR 212-10-
2016/10:39:00
DISTANCE
PROTECTIONNPCIL/KPTCL To-be-discussed
10 400 kV SALEM - UDUMALPET -213-10-
2016/04:39:00R-Y FAULT PGCIL(SR-II) To-be-discussed
11 220 kV EDAMON - TIRUNELVELI 213-10-
2016/16:09:00
13-10-
2016/18:52:00
AC SUPPLY TO
BREAKER
PROBLEM
KSEB/PGCIL(SR-II) To-be-discussed
12 400/220 Kv ICT-1 AT URAVAKONDA13-10-
2016/13:29:00
LOSS OF VOLTAGE
AT URAVAKONDA
400KV
APTRANSCO
APTRANSCO: ICTs at 400kV SS of
Uravakonda were Hand tripped,
as the connected 400kV
Jammalamadugu feeder was
tripped on over voltage.
13 400/220 Kv ICT-2 AT URAVAKONDA13-10-
2016/13:29:00
LOSS OF VOLTAGE
AT URAVAKONDA
400KV
APTRANSCO
APTRANSCO: ICTs at 400kV SS of
Uravakonda were Hand tripped,
as the connected 400kV
Jammalamadugu feeder was
tripped on over voltage.
14 220 kV AMBEWADI - PONDA 214-10-
2016/12:00:00
14-10-
2016/12:14:00B-PHASE FAULT KPTCL/GOA To-be-discussed
15 400 kV KAIGA - GUTTUR 217-10-
2016/19:37:00
B-PHASE TO
GROUND FAULTNPCIL/KPTCL To-be-discussed
16 400 kV KAIGA - GUTTUR 223-10-
2016/11:00:00R-N FAULT NPCIL/KPTCL To-be-discussed
Annexure-III
Page 2 of 6
17 220 kV AMBEWADI - PONDA 125-10-
2016/12:56:00
25-10-
2016/13:10:00LINE FAULT KPTCL/GOA To-be-discussed
18 400 Kv KAYATHAR - KARAIKUDI -129-10-
2016/19:36:00
29-10-
2016/20:39:00
Y PHASE TO
GROUND FAULTTANTRANSCO/PGCIL(SR-II)
TANTRANSCO: Temporary fault.
AR close & lockout at both ends.
19 400 Kv NCTPS - VALLUR 130-10-
2016/06:36:00
30-10-
2016/12:28:00
TRIPPED DUE
FAULT IN Y PHASETANGEDCO/ NTECL
TANTRANSCO/TANGEDCO:
Temporary fault. Carrier fail due
to Fibre cut.
AR configured in BCU and Carrier
fail status is not given to BCU.
Carrier fail status will be included
in the PSL.
20 400 Kv TUMKUR - BIDADI01-11-
2016/13:02:00
01-11-
2016/13:47:00B-PH FAULT PGCIL(SR-II) To-be-discussed
21 400 Kv KLVDPT - VALLUR -104-11-
2016/23:19:00
04-11-
2016/23:38:00
TRIPPED ON Y-N
FAULTTANTRANSCO/ NTECL To-be-discussed
22 400 Kv KUDGI PG - TUMKUR-104-11-
2016/15:58:00
04-11-
2016/16:31:00R-N FAULT PGCIL(SR-II) To-be-discussed
23 400 Kv NTPL - TTRNPS-104-11-
2016/15:37:00
04-11-
2016/15:50:00
LA FAILURE IN LINE-
2NTPL/ PGCIL(SR-II)
NTPL: PGCIL has conducted
preliminary checking on PLCC and
found normal. However NTPL
requested PGCIL to carryout
detailed study with the help of
OEM
24 400 Kv NTPL - TTRNPS-204-11-
2016/15:37:00
04-11-
2016/19:14:00LA FAILURE NTPL/ PGCIL(SR-II)
NTPL: Condition monitoring of LAs
will be carried out shortly
25 400 kV DICHIPALLY - RAMAGUNDAM05-11-
2016/12:50:00
05-11-
2016/16:00:00EARTH FAULT TSTRANSCO/ NTPC
TSTRANSCO: Tripped on B-Phase
to ground fault and zone-1
indications at Dichpally SS end
only. AR acted and was
unsuccessful thereby the line
tripped.
26 400/220 kV ICT-3 AT BANGALORE08-11-
2016/16:11:00
08-11-
2016/16:56:00
BUS BAR
PROTECTION
OPERATED
PGCIL (SR-II) To-be-discussed
Annexure-III
Page 3 of 6
27 400/220 kV ICT-1 AT BANGALORE08-11-
2016/16:11:00
08-11-
2016/16:58:00
BUS BAR
PROTECTION
OPERATED
PGCIL (SR-II) To-be-discussed
28 400 Kv COASTAL - TTRNPS - 108-11-
2016/10:21:00
08-11-
2016/10:33:00
TRIPPED ON RELAY
MAL OPERATIONCEPL/ PGCIL(SR-II) To-be-discussed
29 400/220 kV ICT-2 AT BANGALORE08-11-
2016/16:11:00
08-11-
2016/16:56:00
BUS BAR
PROTECTION
OPERATED
PGCIL (SR-II) To-be-discussed
30 400 Kv GAJWEL - SHANKARPALLY 210-11-
2016/13:18:00
10-11-
2016/17:07:00B- N FAULT TSTRANSCO
TSTRANSCO: Tripped at both ends
on B-Phase to ground fault with
zone-1 & Carrier send indications
at Shankarpally end and Carrier
received indications at Gajwel
end. AR acted on both sides and
was unsuccesful and the line
tripped at both ends.
31 400 kV KHAMMAM - MAMIDIPALLY 113-11-
2016/09:27:00
13-11-
2016/09:55:00
TRIPPED ON
DISTANCE
PROTECTION
PGCIL(SR-I)/ TSTRANSCO
TSTRANSCO: Tripped at both
ends. Tripped on B-Phase to
ground fault and Zone-1
indications at Mamidipally end.
AR acted and was unsuccesful and
there by the line tripped.
32 400/220 kV ICT-2 AT VISAKHAPATNAM14-11-
2016/09:32:00
14-11-
2016/10:17:00
220KV VSS BUS
DEADPGCIL (SR-I) To-be-discussed
33 400 Kv HASSAN - UPCL -114-11-
2016/17:21:00
14-11-
2016/17:53:00B-N FAULT KPTCL/ UPCL To-be-discussed
34 400 Kv HASSAN - UPCL -114-11-
2016/18:23:00
14-11-
2016/18:48:00R-N FAULT KPTCL/ UPCL To-be-discussed
35 400 Kv HASSAN - UPCL- 214-11-
2016/18:23:00
14-11-
2016/19:00:00B-N FAULT KPTCL/ UPCL To-be-discussed
36 400 kV NEYVELI TS2- NEYVELI TS-I16-11-
2016/02:13:00
16-11-
2016/04:53:00
TRIPPED DUE TO
CT BLAST AT BUS
COUPLER AT
NLCEXP
NLC To-be-discussed
Annexure-III
Page 4 of 6
37 400 KV NLCIEXP - NAGAPATNAM16-11-
2016/02:13:00
16-11-
2016/04:05:00
TRIPPED DUE TO
CT BLAST AT BUS
COUPLER AT
NLCEXP
NLC/ PGCIL(SR-II) To-be-discussed
38 400 Kv HASSAN - UPCL 117-11-
2016/17:23:00
17-11-
2016/17:41:00
PLCC MAL
OPERATIONKPTCL/ UPCL To-be-discussed
39 400 kV RAMAGUNDAM - GAJWEL18-11-
2016/10:56:00
18-11-
2016/11:20:00
RELAY MAL
OPERATION.NTPC/ TSTRANSCO
TSTRANSCO: Tripped on direct
trip received indications at Gajwel
end only due to PLCC mal
operation at Gajwel end which is
being maintained by PGCIL.
Requested PGCIL to examine the
same.
40 400 kV KAIGA - NARENDRA -219-11-
2016/13:35:00DT RECEIVED NPCIL/ KPTCL To-be-discussed
41 400 kV N'SAGAR - MAHABOOB NAGAR19-11-
2016/14:46:00
19-11-
2016/15:19:00SPURIOUS SIGNAL TSTRANSCO To-be-discussed
42 400 kV RAMAGUNDAM - GAJWEL19-11-
2016/09:32:00
19-11-
2016/09:46:00R -N FAULT NTPC/ TSTRANSCO
TSTRANSCO: Tripped on direct
trip received indications at Gajwel
end only due to PLCC mal
operation at Gajwel end which is
being maintained by PGCIL.
Requested PGCIL to examine the
same.
43 HVDC BHADRAVATHI POLE 221-11-
2016/01:14:00
21-11-
2016/02:22:00
VALVE CONTROL
CARD PROBLEMPGCIL (SR-I) To-be-discussed
44 230 kV PONDYCHERRY- VILLIANUR25-11-
2016/17:29:00
25-11-
2016/18:29:00
AC SUPPLY TO
BREAKER
PROBLEM
PGCIL (SR-II)/ PED To-be-discussed
45 400/230 kV ICT-1 AT TRICHY25-11-
2016/17:27:00
25-11-
2016/18:14:00
TRIPPED ON 220
KV BUS BAR
PROTECTION
PGCIL(SR-II) To-be-discussed
46 400/230 kV ICT-1 AT NLC25-11-
2016/17:28:00
25-11-
2016/18:01:00
TRIPPED ON
OVERLOADNLC To-be-discussed
47 400/230 KV ICT-2 AT NLC25-11-
2016/17:28:00
25-11-
2016/18:24:00
AC SUPPLY TO
BREAKER
PROBLEM
NLC To-be-discussed
Annexure-III
Page 5 of 6
48 400/230 kV ICT-2 AT TRICHY25-11-
2016/17:27:00
25-11-
2016/18:30:00
TRIPPED DUE TO
220 KV BUS BAR
PROTECTION
PGCIL (SR-II) To-be-discussed
49 400/220 kV ICT-1 AT KURNOOL25-11-
2016/17:15:00
25-11-
2016/20:48:00WTA TRIP APTRANSCO To-be-discussed
50 220 kV PONDYCHERRY- BAHOOR25-11-
2016/17:20:00
25-11-
2016/18:25:00H/T ON OVERLOAD PGCIL (SR-II)/ PED To-be-discussed
51 400 KV TUTICORN PS - COASTAL - 126-11-
2016/10:38:00
26-11-
2016/18:22:00AR CHECKING PGCIL (SR-II)/ CEPL To-be-discussed
52 400 KV DHARMAPURI - TUTICORN PS -27-11-
2016/02:55:00
27-11-
2016/04:34:00
SINGLE PHASE TO
GROUND EARTH
FAULT
PGCIL(SR-II) To-be-discussed
53 220 kV GUMMUDIPUNDI - SULLURPET28-11-
2016/12:00:00
28-11-
2016/13:00:00R - N FAULT TANTRANSCO/ APTRANSCO To-be-discussed
54 400 kV HASSAN - NEELAMANGALA 102-12-
2016/21:02:00
DISTANCE
PROTECTIONPGCIL(SR-II)/ KPTCL To-be-discussed
55 400/220 kV ICT-2 AT KURNOOL03-12-
2016/20:40:00
03-12-
2016/21:10:00
BREAKER
PROBLEMAPTRANSCO To-be-discussed
56 400 kV JSW TORANAGALLU-GUTTUR03-12-
2016/02:45:00
DISTANCE
PROTECTIONJSWEL/ KPTCL To-be-discussed
Annexure-III
Page 6 of 6