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Agenda for the 58
th Meeting of PCSC scheduled to be held on 18
th October, 2016 Page 1
SOUTHERN REGIONAL POWER COMMITTEE BENGALURU
Agenda for the 58th Meeting of Protection Coordination
Sub-Committee of SRPC to be held on 18th October, 2016 (Tuesday)
1. Introduction
2. Confirmation of Minutes of last PCSC meeting
Confirmation of minutes of 57th Protection Coordination Sub-Committee meeting held on 02.09.2016.
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 August-September, 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 16.08.2016 – 15.09.2016 has been brought to Constituents’ notice vide SRPC letters (i) No. SRPC/ SE-III/ PCSC-58/ 2016/6095-99 dated 07.09.2016 and (ii) No. SRPC/ SE-III/ PCSC-58/ 2016/ 6280-89 date 22.09.2016. 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 14.10.2016.
4.2 Remedial measures for "Transmission Elements under Forced Outage"
The Constituents are requested to send the remedial measures/ actions taken by them for the tripping events as circulated vide our emails. (Annexure-III)
Agenda for the 58
th Meeting of PCSC scheduled to be held on 18
th October, 2016 Page 2
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 August, 2016 is still awaited from the following SR-Constituents:
TSGENCO (Hydro), KPTCL, Puducherry, MAPS, NTECL, MEPL & SEL
5. Other Protection Issues, if any, with the permission of the Chair
6. 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.
7. Date of next PCSC meeting
The 59th PCSC meeting would be conducted on 30.11.2016 (Tuesday) at 10:30 hrs in the
Conference Hall of SRPC, Bengaluru.
*****
Grid Occurrences - 58
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 Kalamasherisub station of KSEB
23-08-2016 at 11:20 hrs
Triggering incident was conductor snapping in 110kV Kalamashery-Kaloor feeder
Load loss : 500MW
GD-1
2
Complete outage of 220kV Nagjheri power station of KPCL.
31-08-2016 at 12:47hrs
Bus dead occurred at 220kV Nagjheri Power station due to tripping of evecuating lines.
GD-1
3
Complete outage of Kadra power station of KPCL
06-09-2016at 14:40 hrs
LBB of 220kV Kodasalli breaker at Kadra end got operated which resulted in tripping of Bus at Kadra and in turn led to tripping of all elements
GD-1
4
Complete outage at 220kV Chitoor substation
09-09-2016at 10:40 hrs
220kV Bus sectionalizer B-Ph Bus jumper towards Kalikiri feeder got snapped creating a bus fault at 220kV Chittoor substation
GD-1
5
Complete outage at Sharavathy Tail Race power Station
09-09-2016 at 11:19 hrs
Spurious operation of LBB protection of line feeder had led to tripping of 220kV bus at Sharavathy tail race power station.
GD-1
6
Disturbance in Kerala system
12-09-2016 at 14:47 hrs
Partial disturbance occurred in central Kerala grid due to overloading and tripping of 220kV lines. Loss of infeed to 220kV Kalamashery, 220kV Bramapuram, 220KV Ambalamugal, 220 Pallom& 220kV Kochi. Generation at Neriamangalam, Panniar, Chengulam and Pallivasal also got affected during the incident.
Load loss: 690 MW Gen Loss: 300MW
GD-1
Annexure-I
Page 1 of 4
7
Complete outage at Varahi hydro Power Station
15-09-2016 at 14:06 hrs
LBB protection operated and caused bus shut down at Varahi.
GD-1
II. Details of Grid incidents:
Sl. No.
Details of Event Date & Time Reason Category
1 Tripping of 400/220 kV ICT-2 at N’Sagar
09-08-2016at 9:31 hrs
ICT -2 tripped due to mal-operation of Y-Phase PRD
2 Tripping of 400/220kV ICT-2 at 400kV Guttur
13-08-2016 at 09:15 hrs
ICT-2 got tripped without any relay operation
3 Tripping of 400kV Sriperambadur-SV.Chatram line
14-08-2016 at 13:49 hrs
line tripped at Sriperambadur end only on operation of directional earth fault protection
4
Tripping of 400kV NCTPS-Vallur line – 2
21-08-2016at 7:15 hrs& 20:35 hrs
Direct trip was sent from NCTPS to Vallur which led to tripping of breaker at Vallur end
5
Tripping of 400kV Neyveli TS2-Pugalur line and 400kV Neyveli TS2-Neyveli 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.
6
Tripping of 220kV lines and ICT’s at 220kV Chikampalli substation of APTRANSCO
22-08-2016 at 3:15 hrs
Failure of B-phase CT had occurred in 220kV Chinakampalli-Kalikiri feeder at Chinakampalli end.
7 Multiple tripping at 400kV Neyveli TS-II
22-08-2016at 06:14 hrs
Bus bar protection of bus-2 operated at NLC-II due maloperation CT selection relay of NLC2-NLC2 expansion feeder
8 Tripping of HVDC Gazuwaka Pole-1
23-08-2016 at 13:08 hrs
Non-opertion of B-phase OLTC tap of Pole-2 had led to undesired tripping of east filters and Pole-1
9
Tripping of 400kV Jamalamadugu-Uruvakonda and 400kV Jamallamadugu-Kurnool (AP)-2 lines
28-08-2016at 2:06 hrs
Both lines got tripped on operation of over-voltage stage-1.
10
Tripping of 400kV Krishnapatnam-Chitoor line-1
29-08-2016 at 21:46 hrs
R-phase to earth fault had occurred in line. Auto reclose was successful at Chitoor end and was not successful at Krishnapatnam
11 Tripping of 400/ 110kV ICT-4 at Sunguvarchatran
30-08-2016 at 12:06hrs
Tripped due to LV sideBph.LA failure.
Annexure-I
Page 2 of 4
12 Tripping of 400kV Kayathar-Karaikudi line-2
01-09-2016at 2:15 hrs
line tripped on operation of over voltage protection at Karaikudi end and direct trip was received at Kayathar
13
Tripping of 400kV Raichur-Gooty line-1 and Gooty-Tumkur line-2
01-09-2016at 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.
14
Tripping of 400kV Gooty-Tumkur line-2
02-09-2016 at 21:56 hrs
line tripped on operation of over-voltage protection at Gooty end and diect trip was received at Tumkur
15
Tripping of 220kV Sabarigiri-Theni line
03-09-2016 at 10:21hrs
Line tripped on Ground Over current and backup protn. At Theni end distance protection Zone-2 operated.
16
Multiple tripping at 400 kV KalpakkaStation
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
17
Multiple tripping at 230kV Alamathy Station
14-09-2016 at 11:13Hrs
Bus Bar Protection (Zone2) of 230kV Bus-B got operated at Alamathy Station during fault in 230kV Alamathy-Koratur feeder.
15-09-2016 at 22:14 hrs
Bus Bar Protection (Zone1) of 230kV Bus-A got operated at Alamathy Station during fault in 230kV Alamathy-OPG-1 feeder.
18
Tripping of 765kV Solapur-Raichur line
14-09-2016 at 15:43 hrs
line tripped at Solapur end and was holding from Raichur end.
19
Tripping of 400kV Madurai-Karaikudi line
hrs 15-09-2016at 03:02hrs
line tripped on operation of over-stage stage-1 at karaikudi and direct trip was received at Madurai
III. Failure or non-operation of Auto reclose during transient fault
Sl. No.
Element Date & Time Reason
Category
1
Tripping of 220kV Ambewadi-Ponda line-1
12:37 hrs on 15-08- 2016
line tripped due to transient fault in B-phase. Auto reclose is not enabled
13:43 hrs on 19-08-2016
2 Tripping of 220 kVChikodi- Talandage
25-08-2016 at hrs
R-phase to earth fault. Line auto-reclosed at Chikodi and did not reclose at Talandage.
Annexure-I
Page 3 of 4
3 Tripping of 400kV Krishnapatnam-Chitoor line-1
29-08-2016 at 21:46 hrs
R-phase to earth fault had occurred in line. Auto reclose was successful at Chitoor end and was not successful at Krishnapatnam
4 Tripping of 400kV N’Sager-Cudappah line-2
06-09-2016at 19:52 hrs
line tripped on a Y-phase to earth fault. Line auto-reclosed at N’sagar end and failed to reclose at Cudappah.
5 Tripping of 220kV Ambewadi-Ponda line-1
07-09-2016 at 13:32 hrs
line tripped on a B-phase to earth fault. Auto-reclose is not enabled for the line
6
Tripping of 220kV Yerandahalli-Hosur line
08-09-2016 at 14:16 hrs
line tripped on R-phase to earth fault. Attempt for auto reclose could not be established from D.R of Hosur end. Optimo distance relay at Yerandahalli end had sensed Zone-3 which seems to be mal-operation
7
Tripping of 400kV Khammam-KTPS line-1
13-09-2016 at 19:15 hrs
line 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 receive
IV. Trippings due to PLCC mal-operation
Sl. No.
Element Date & Time Reason
Category
1 Tripping of 400kV Ramagundam-Warangal line
12-09-2016at 12:03 hrs
Line tripped on direct trip receive at Ranagundam end and line was holding from Warangal end.
*****
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 30.09.2016
Remarks
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
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 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.
Pending42/II/3
Pending Implementation of PCSC Recommendations (up to 57th 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
Outage at
Regulapadu
station of
APTRANSCO
Annexure-II
Page 1 of 26
44/III/2 Tripping of 400kV
Ghanapur-Mamidapalli
line
15-04-2015
at 2:03 hrs
Line tripped at Mamidapalli end only and
was holding at Ghanapur. Overvoltage
protection had operated at Mamidapalli
TSTRANSCO to make DR functional at Mamidipalli TSTRANSCO TSTRANSCO informed vide their mail dated 24.06.15 that the existing
relays would be replaced with numerical relays in DPR works.
Pending
55/II/21 Multiple tripping at
Vijayawada TPS
(Gen Loss : 750 MW)
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
line tripped on operation of line reactor
protection at Sriperambadur end and direct
trip was sent to Chitoor. Buchholz relay of
line reactor of 400kV Chitoor-
Sriperambadur got operated at Sriperabadur
end.
01-02-2016
at 9:55 hrs
Telangana
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.
Pending
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.
APTRANSCO
Tripping of 400 kV
Chittoor-Sriperambadur line
42/II/3
Pending
Outage at
Regulapadu
station of
APTRANSCO
52/II/1 APTRANCO to take steps to ensure that DR and EL are configured for
recording DT receipt event at their
400 kV Chittoor substation.
APTRANSCO APTRANSCO mail dated on 22-06-2016:
The compliance report will be furnished after completion of
configuration.
APTRANSCO mail dated on 31-08-2016:
The retrofiting works are going on for automation of substation and will
be atteneded under these works.
Pending
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
Tripping of 220kV Chittoor-
Tiruvalam
56/II/13
50/II/14
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
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. ---------
Completed
APGENCO/
APTRANSCO
APTRANSCO mail dated on 31-08-2016:
PLCC carrier aided protection wasprovided.
Pending
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:
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).
PendingDuring 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.
18-11-2015
at 11:20 hrs
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.
Annexure-II
Page 2 of 26
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 Yet to be informed 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 Yet to be informed 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 Yet to be informed 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 Yet to be informed 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 Yet to be informed 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 Yet to be informed 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
TSTRANSCO07-09-2015
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
Pending48/II/5 Yet to be informed
Annexure-II
Page 3 of 26
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.
PendingRTPS Tripping incidents
and the Spl meeting held at
RTPS on 13th and 14th
March 2014
30/I/A
Karnataka
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-14
Annexure-II
Page 4 of 26
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
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 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
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.
KPCL
Mail received on 28-05-2015:
1. Main-2 relays already installed and commissioned.
2. DC fuses are intact. Till date no such incidence occurred.
3. Possibility of DC-1 & DC-2 arrangement and splitting of DC will be
reviewed.
Mail received on 07-07-2015 , 21-10-2015 and 23-11-2015:
1. Completed.
2. Completed.
3. Possibility of DC-1 & DC-2 arrangement and splitting of DC will be
reviewed.
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
PendingKPCL 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.
KPCL to check the possibility of providing line differential protection
between RTPS and Yermarus stations.
Pending
Annexure-II
Page 5 of 26
ICT tripped due to operation of Over current
and Earth fault relay
14-01-2015
at 1:09
hrs
Tripping of
400/220kV ICT-1 at
BTPS
43/II/14 KPCL PendingKPCL 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.
KPCL to check the possibility of providing line differential protection
between RTPS and Yermarus stations.
Annexure-II
Page 6 of 26
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 Tripping of 400kV Raichur
TPS Bus-2
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 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).
54/I/4 Tripping of Nagjheri
Generators
220 kV Nagjheri - Bidnal line tripped on B-
E fault at 12:28 Hrs. At the same time, five
running generating units (1, 2, 3, 4 & 6) at
Nagjheri tripped on operation of Generator
Transformer’s back-up Over Current &
Earth Fault protection.
46/II/21 KPCL07-06-2015
at 01:35 hrs
Trippings at 220kV Raichur
TPS
Yet to be informed Pending 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
PendingYet to be informed14-04-2016
at 12:29 hrs
Annexure-II
Page 7 of 26
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
Multiple tripping at 400 kV
Raichur TPS Station
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.
GD-1 at Mahalingapura
Substation of KPTCL
1. PCSC forum recommended KPTCL to replace the old static
distance protection relays with numerical relays.
2. PCSC forum also requested KPTCL to provide a broken conductor
alarm indication in Control Room.
3. Standing instruction needed to be given to the all substation
personnel for not changing the relay settings without approval of
RT/MRT wing.
Tripping 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
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.
KPCL
55/II/19 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
38/GD/3.1
54/II/13
25-10-2014
15-04-2016
at 15:36 hrs
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.
1.KPCL to properly configure the distance relays at YTPS end on both
YTPS – BTPS line and YTPS-RTPS line with specific focus on reaches
and timings of Zone-2, Zone-3, and Zone-4 (reverse).
2.KPCL to ensure the healthiness of Direct Trip circuits and relay coils
at YTPS.
3.KPCL to ensure time sync of DR’s and EL’s at YTPS with GPS.
Pending
KPCL
Yet to be informed
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.
Pending
Pending
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.
KPTCL
Yet to be informed
KPCL
Yet to be informed
Pending
Annexure-II
Page 8 of 26
GD-1 at Mahalingapura
Substation of KPTCL
1. PCSC forum recommended KPTCL to replace the old static
distance protection relays with numerical relays.
2. PCSC forum also requested KPTCL to provide a broken conductor
alarm indication in Control Room.
3. Standing instruction needed to be given to the all substation
personnel for not changing the relay settings without approval of
RT/MRT wing.
38/GD/3.1 25-10-2014 PendingFault 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.
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.
KPTCL
Annexure-II
Page 9 of 26
220kV Sedam-
Tandur line
Line tripped on Yphase to earth fault from
both the ends
20-12-2014
at 22:20 hrs
KPTCL was requested to explore the possibility of providing A/R
feature to this line and submit the remedial measures to the PCSC
forum.
KPTCL
Mail 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
GD-1 at 220kV Ambewadi
Station of KPTCL
40/I/1
40/IV/1
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
Pending
1. Till the completion of R&M works for bus bar and LBB protection,
KPTCL shall explore the possibility of having split bus operation at
Ambewadi and submit the details of the same to PCSC forum.
2. KPTCL shall provide the details of the tripping of Supa hydro station
connected downstream from 110 kV bus.
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.
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.
Annexure-II
Page 10 of 26
Fault occurred in 220kV Sedam-Shahpur
line
Fault in 220kV Ambewadi-Nagjheri line-2
KPTCL
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.
Tripping of Unit-1&2
along with 400/220kV
ICT-2 at Raichur TPS
KPTCL
27-01-2015
at 8.00 hrs
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 Complete outage at 220kV
Sedam Substation of
KPTCL (GD-1)
Complete outage of 220kV
Sedam substation of
KPTCL
42/I/1
(GD)
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.
1. KPTCL shall provide A/R feature on Ambewadi – Ponda 220 kV
D/C inter-state line.
2. Till the completion of R&M works for bus bar and LBB protection,
KPTCL shall explore the possibility of having split bus operation at
Ambewadi and submit the details of the
same to PCSC forum.
06-08-2015
at 4:51 hrs
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.
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.
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.
KPTCL
Pending
Pending
PendingYet to be informed
Annexure-II
Page 11 of 26
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.
Yet to be informed
KPTCL to fast-track providing A/R on all 220 kV lines emanating
from Ambewadi SS to prevent Station shut-down on temporary faults.
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
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
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.
Outage of 220kV
Ambewadi station in
Karnataka
KPTCL mail received on 23-01-2016:
Will be complied in a months time.
Pending
PendingKPTCL 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.
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
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
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.
KPTCL
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
Pending
KPTCL
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
29.10.2015
at 14:34 hrs
Pending
Pending
Annexure-II
Page 12 of 26
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
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
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.
51/I/3
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.
53/I/1 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.
PendingKPTCL 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
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.
01-07-2016
at 03:03 hrs
Tripping of 220 kV
Chikkodi-Mudshingi and
220 kV Chikkodi-
Talandage lines
57/II/1
KPCL/ KPTCL
PendingKPTCL Mail received dated 25-05-2016:
SEE, RTC, Bangalore to update the status
KPTCL
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.
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
16-03-2016
at 11:39 Hrs
22-02-2016
at 12:36 hrs
PendingComplete outage of 220kV
Nagjheri power station and
220kV Ambewadi
substation of KPTCL
Annexure-II
Page 13 of 26
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
43/II/5 29-03-2015
at
15:29 hrs
Tripping of 400kV
Alamathy-
SVChatram line-1&2
and 400/230kV ICT
at S.V.Chatram
KPTCL Mail received dated 28-06-2016:
Modifications to be carried in Nagzari SPS logic is submitted to
SRLDC/SRPC for verification and approval
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.
KPCL/ KPTCLComplete outage of 220kV
Ambewadi station of
KPTCL and 220kV
Nagjheri of KPCL
18-03-2016
at 14:40 hrs
220kV lines from Nagjheri power house
started tripping from 11:00 hrs due to fault
in lines. The sequence of tripping is shown
in SOE list. At 12:33 hrs, 220kV Narendra-
Ambewadi lines-1&2 got tripped which
resulted in loss of evacuation path to
Nagjheri station resulting in tripping of
running Units and complete outage at
Nagjhheri power station. 220kV Ambewadi
station also got de-energized due to tripping
of source feeders i.e. 220kV Narendra-
Ambewadi-1&2 and 220kV Nagjheri-
Ambewadi-1&2.
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)
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.
KPCL/ KPTCL
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.
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.
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.
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
22-02-2016
at 12:36 hrs
PendingComplete outage of 220kV
Nagjheri power station and
220kV Ambewadi
substation of KPTCL
Pending
Annexure-II
Page 14 of 26
48/I/1
(GD)
Complete outage of 230kV Palladam, 230
kV Othakalmandapam S/s, 230 kV
Coimbatore S/s, 230 kV Thudialur and 230
kV Sadayapalayam S/s
Pending 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.
TANTRANSCO05-09-2015
at 14:04 hrs
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.
Disturbance in 220kV
Tamilnadu system
Annexure-II
Page 15 of 26
1. 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.
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.
Complete outage of 230kV
Mywadi station of
TANTRANSCO
50/I/3
(GD)
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:
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
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.
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
Busbar protection got operated for a fault in
230kV Mywadi-Anaikadavu line
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.
21-12-2015
at 6:28 hrs
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
55/I/1
(GD)
TANTRANSCO
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.
TANTRANSCO Pending
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.
Annexure-II
Page 16 of 26
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
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
Pending
(Recommendat
ion No.1)
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.
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.
KSEB
Pending
Kerala
PGCIL (SR-I & SR-II)
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.
Complete outage of Idukki
Hydro Power Station (GD-
1)
44/I/1
(GD)
28-04-2015
at 12:30 Hrs
55/II/5 PGCIL (SR-I) Yet to be informed
Annexure-II
Page 17 of 26
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
Pending55/II/5 PGCIL (SR-I) Yet to be informed
Annexure-II
Page 18 of 26
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
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
Others
Tripping of 400kV
Alamathy-Tiruvalam line-1
and 400kV Alamathy-
Vallur line-2
57/II/2 Tripping of 400 kV Mywady-Salem line-1 and 400 kV Mywady-Madurai line
51/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
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.
PendingNTECLNTECL, 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.
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 Pending
Annexure-II
Page 19 of 26
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
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) Yet to be informed Pending
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
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.
NPCIL (MAPS) Yet to be informed
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
Annexure-II
Page 20 of 26
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
34/I/6 400/220 kV ICT-1 & 2 at
MUNIRABAD
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 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)
Miscellaneous
16-07-2014
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.
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.
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)
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)
Annexure-II
Page 21 of 26
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.
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)
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)
Annexure-II
Page 22 of 26
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
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
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
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.
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)
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.
R-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
31-07-2015
at
11:44 hrs
Tripping of 220kV Kadra-
Karwar lines - 1&2 and
220kV Kaiga-Kadra line
KPTCL/ KPCL/ NPCIL
(KAPS)
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)
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
Pending
Annexure-II
Page 23 of 26
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)]
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
Tripping of 400kV
Sattenapalli-Vijayawada
line
51/II/6 Pending
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
53/I/5
Annexure-II
Page 24 of 26
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/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
56/II/16
Pending
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 25 of 26
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 Definite Weak Time 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)
Yet to be informed 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/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
Yet to be informed Pending
Annexure-II
Page 26 of 26
Sl.No. Element NameOutage
date/time
Revival
date/time
Reason for
OutageSender/ Receiver Remedial Measures/ Actions taken
1 220 kV NEYVLI - VILLIANUR 05-08-2016/06:02:00 05-08-2016/06:03:00
FAULT TRIPPED
DUE TO DISTANCE
PROTECTION
NLC/PED
NLC:Feeder tripped on Zone1 R-N fault. AR
operated.
PED:
2 220 kV AMBEWADI - PONDA 2 12-08-2016/05:06:00 DPR OPERATED KPTCL/GOA To-be-discussed
3 400 Kv COASTAL - NTPL 12-08-2016/18:32:00 12-08-2016/19:02:00 VT FUSE FAILURE CEPL/NTPL To-be-discussed
4 400/220 kV ICT-2 AT GUTTUR 13-08-2016/09:15:00 13-08-2016/09:42:00NO RELAY
INDICATIONKPTCL To-be-discussed
5 400 kV KOLAR - HOSUR 2 14-08-2016/15:16:00 14-08-2016/19:28:00Y-PH LA FAILURE @
HSR ENDPGCIL(SR-II) To-be-discussed
6 400 Kv SPDR - SVCHATRAM 14-08-2016/13:49:00 14-08-2016/14:07:00DT RECEIVED @
SPDRPGCIL(SR-II)/TANTRANSCO
TANTRANSCO: At the time of 400KV
S.V.Chatram -Alamathy Feeder-2 tripping on
14.08.2016 at 13:49 hrs., 400KV S.V.Chatram
- Sriperumpudur (PGCIL) Feeder tripped on
DEF Protection at PGCIL end only. There was
no tripping of 400kV Sriperumpudur (PGCIL)
feeder at 400kV S.V.Chatram SS on
14.08.2016 at 13:49 hrs.
PGCIL(SR-II):
7 220 kV AMBEWADI - PONDA 1 15-08-2016/12:37:00 15-08-2016/12:52:00 TRANSIENT FAULT KPTCL/GOA To-be-discussed
8 220 kV AMBEWADI - PONDA 1 19-08-2016/13:43:00 19-08-2016/14:02:00TRIPPED ON B-N
FAULTKPTCL/GOA To-be-discussed
Pending Remedial Measures/ Actions taken
for the Critical Tripping Incidents (as on 30.09.2016)
Annexure-III
Page 1 of 7
9 400 kV NEYVELI TS 2 - PUGALUR 21-08-2016/10:35:00 21-08-2016/11:20:00
TRIPPED ON
INSULATOR FLASH
OVER IN NLC2-
NLC2E AT NLC2 S/Y
NLC/PGCIL(SR-II)
NLC: The pugalur end breaker got tripped on
Y-N Zone1 distance fault due to NLC2 to
NLC2E Y Phase insulator flashover. This
caused Pugalur feeder breaker at TS2 end to
trip on overvoltage. DT was sent to Pugalur
end and 3 phase trip was initiated.
10 220 kV AMBEWADI - PONDA 1 21-08-2016/16:22:00TRIPPED ON B-N
FAULTKPTCL/GOA To-be-discussed
11400 kV NEYVELI TS 2 - NEYVELI TS2
EXP21-08-2016/10:35:00
INSULATOR
FLASHOVERNLC
NLC:The feeder got tripped on current
differential due to insulator flash over at TS2
end
12 400/220 kV ICT-1 AT CUDDAPAH 22-08-2016/03:11:00 22-08-2016/05:20:00
220KV BUSBAR
PROTECTION
OPERATED DUE TO
CT BLAST
PGCIL(SR-I)/APTRANSCO
PGCIL(SR-I):Tripped due to operation of
APTRANSCO's Bus-bar protection on 220kV
CT failure at APTRANSCO's 220kV Station
APTRANSCO:
13 400/220 kV ICT-2 AT CUDDAPAH 22-08-2016/03:11:00 22-08-2016/05:23:00
220KV BUSBAR
PROTECTION
OPERATED DUE TO
CT BLAST
PGCIL(SR-I)/APTRANSCO
PGCIL(SR-I):Tripped due to operation of
APTRANSCO's Bus-bar protection on 220kV
CT failure at APTRANSCO's 220kV Station
APTRANSCO:
14 400 Kv TUMKUR - BIDADI 23-08-2016/08:30:00 23-08-2016/12:35:00 TRIPPED ON FAULT PGCIL(SR-II) To-be-discussed
15 400 Kv TUMKUR - BIDADI 23-08-2016/12:46:00 23-08-2016/16:25:00TRIPPED ON R_N
FAULTPGCIL(SR-II) To-be-discussed
16 400 Kv NELAMANGALA - TUMKUR 23-08-2016/09:00:00 23-08-2016/15:27:00 R-N FAULT KPTCL/PGCIL(SR-II) To-be-discussed
17 HVDC GAJUWAKA POLE 1 23-08-2016/13:08:00 23-08-2016/13:44:00
BLOCKED DUE TO
FILTER
UNBALANCE
DURING POLE II
DEBLOCKING
PGCIL(SR-I)PGCIL(SR-I):The pole went to standby mode
due to strucking of B-Phase Tap changer.
18 400/220 kV ICT-3 AT BANGALORE 27-08-2016/11:21:00 TRIPPED KPTCL To-be-discussed
Annexure-III
Page 2 of 7
19 400 kV KAIGA - GUTTUR -1 28-08-2016/11:50:00 28-08-2016/12:35:00 B-N FAULT NPCIL/KPTCL To-be-discussed
20400 Kv KRISHNAPATNAM -
CHITTOOR29-08-2016/21:46:00 29-08-2016/22:07:00 R-N FAULT To-be-discussed
21 400 Kv GOOTY - TUMKUR - 2 31-08-2016/15:13:00 31-08-2016/18:36:00DT RECEIVED
FROM TMKRPGCIL(SR-I)
PGCIL(SR-I):O/V Stage-1 protection operated
at Tumkur end
22 220 kV SABARGIRI - THENI 03-09-2016/10:21:00 03-09-2016/10:48:00 EARTH 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:
23 400 kV VIJAYAWADA - GAZUWAKA- 1 06-09-2016/16:43:00 06-09-2016/17:08:00
ZONE - 2
PROTECTION
OPERATED
APTRANSCO/PGCIL(SR-I)
PGCIL(SR-I):Tripped in Zone-2 due to non-
clearence of substation fault at
APTRANSCO's Kalpaka SUbstation
24 400 kV SIMHADRI - KALPAKKA -3 06-09-2016/16:43:00 06-09-2016/17:17:00BUS-1 FAULT @
KLPAKA ENDNTPC/APTRANSCO To-be-discussed
25 400 kV SIMHADRI - KALPAKKA -1 06-09-2016/16:43:00 06-09-2016/16:58:00BUS-1 FAULT @
KLPAKA ENDNTPC/APTRANSCO To-be-discussed
26 400 kV KALPAKKA - VEMAGIRI -1 06-09-2016/16:43:00 06-09-2016/17:13:00BUS-1 FAULT @
KLPAKA ENDAPTRANSCO To-be-discussed
27 400 kV KALPAKKA - GAZUWAKA -2 06-09-2016/16:43:00 06-09-2016/17:33:00BUS-1 FAULT @
KLPAKA ENDAPTRANSCO/PGCIL(SR-I)
PGCIL(SR-I):Tripped in Zone-2 due to non-
clearence of substation fault at
APTRANSCO's Kalpaka SUbstation
28 400 kV KALPAKKA - GAZUWAKA -1 06-09-2016/16:43:00 06-09-2016/17:32:00BUS-1 FAULT @
KLPAKA ENDAPTRANSCO/PGCIL(SR-I)
PGCIL(SR-I):Tripped in Zone-2 due to non-
clearence of substation fault at
APTRANSCO's Kalpaka SUbstation
29400/220 kV ICT-1 AT
VISAKHAPATNAM06-09-2016/16:43:00 06-09-2016/17:21:00
TRIPPED ON OVER
CURRENT
PROTECTION
APTRANSCO To-be-discussed
30 400/220 kV ICT-1 AT KALPAKA 06-09-2016/16:43:00 06-09-2016/17:14:00BUS-1 FAULT @
KLPAKA ENDAPTRANSCO To-be-discussed
31 400 kV HNPCL- KALPAKKA 1 06-09-2016/16:43:00 06-09-2016/18:08:00BUS-1 FAULT @
KLPAKA ENDHNPCL/APTRANSCO To-be-discussed
32 400 kV SIMHADRI - KALPAKKA -4 06-09-2016/16:43:00 06-09-2016/16:58:00BUS-1 FAULT @
KLPAKA ENDNTPC/APTRANSCO To-be-discussed
Annexure-III
Page 3 of 7
33 400 kV SIMHADRI - KALPAKKA-2 06-09-2016/16:43:00 06-09-2016/16:57:00BUS-1 FAULT @
KLPAKA ENDNTPC/APTRANSCO To-be-discussed
34 220 kV AMBEWADI - PONDA 1 07-09-2016/13:32:00 07-09-2016/16:03:00 B-N FAULT KPTCL/GOA To-be-discussed
35 220 kV CHITTOR - THIRUVALEM 09-09-2016/10:40:00
BUS BAR
PROTECTION
OPERATED @
220KV CTR END
APTRANSCO/PGCIL(SR-II)
TANTRANSCO: 230kV Thiruvalam – Chittor
feeder has not tripped on 09.09.2016 at
10:40 hrs. at Thiruvalam end since the 230kV
Bus fault at Chittor SS was cleared by Bus Bar
Protection Relay at
Chittor end.
36 400 kV KHAMMAM - KTPS 1 13-09-2016/19:15:00 13-09-2016/21:45:00TRIPPED ON R-PH
FAULTPGCIL(SR-II)/TSGENCO
PGCIL(SR-I):Tripped on Line Fault at KTPS end
only. Line belongs to TSTRANSCO. A/R
sucessful at Khammam (POWERGRID, SR1)
end.
TSGENCO:
37 400/230 kV ICT 5 AT ALAMATHY 14-09-2016/11:13:00 14-09-2016/11:30:00
TRIPPED DUE TO
FAULT ON 230KV
SIDE
TANTRANSCO
TANTRANSCO: Due to passing fault in 230KV
Alamathy-Korattur feeder (AФ), 230KV
ALAMATHY-KORATTUR feeder got tripped at
both ends . At the same time, the feeders
connected in 230KV BUS-B got tripped due
to actuation of 230kV BBP. ICT 4 and ICT 5
were in Bus B. The 230KV Bus-B was
normalized at 11:32 hrs. through 230kV Bus
coupler. All feeders were normalized by
11:48 hrs.
The Bus bar protection scheme will be
tested for healthiness.
38 400 Kv KUDGI- KOLHAPUR-1 14-09-2016/19:36:00 14-09-2016/20:20:00DT RECEIVED AT
KUDGIPGCIL(SR-II) To-be-discussed
Annexure-III
Page 4 of 7
39 400/230 kV ICT 4 AT ALAMATHY 14-09-2016/11:13:00 14-09-2016/11:30:00
TRIPPED DUE TO
FAULT ON 230KV
SIDE
TANTRANSCO
TANTRANSCO: Due to passing fault in 230KV
Alamathy-Korattur feeder (AФ), 230KV
ALAMATHY-KORATTUR feeder got tripped at
both ends . At the same time, the feeders
connected in 230KV BUS-B got tripped due
to actuation of 230kV BBP. ICT 4 and ICT 5
were in Bus B.The 230KV Bus-B was
normalized at 11:32 hrs. through 230kV Bus
coupler. All feeders were normalized by
11:48 hrs.
The Bus bar protection scheme will be
tested for healthiness.
40 400/230 Kv ICT 3 AT ALAMATHY 15-09-2016/22:14:00 16-09-2016/23:32:00
230 KV BUS BAR
PROTECTION
OPERATED
TANTRANSCO
TANTRANSCO: Due to passing fault in 230KV
Alamathy-Korattur feeder (AФ), 230KV
ALAMATHY-KORATTUR feeder got tripped at
both ends . At the same time, the feeders
connected in 230KV BUS-B got tripped due
to actuation of 230kV BBP. ICT 4 and ICT 5
were in Bus B.The 230KV Bus-B was
normalized at 11:32 hrs. through 230kV Bus
coupler. All feeders were normalized by
11:48 hrs.
The Bus bar protection scheme will be
tested for healthiness.
41 220 kV SABARGIRI - THENI 16-09-2016/13:50:00 16-09-2016/13:57:00 EARTH FAULT KSEB/ TANTRANSCOTANTRANSCO: Temporary fault. AR
successful at Theni end.
42 400 Kv BTPS - YTPS 16-09-2016/16:55:00 16-09-2016/18:33:00EARTH FAULT
RELAY OPERATEDKPCL To-be-discussed
43 400 Kv RAICHUR - YTPS 16-09-2016/16:55:00 16-09-2016/18:39:00EARTH FAULT
RELAY OPERATEDKPCL To-be-discussed
44400 Kv VTPS STG IV - SATTENAPALLI -
216-09-2016/15:18:00 16-09-2016/16:11:00
EARTH FAULT
RELAY OPERATEDAPGENCO/TSTRANSCO To-be-discussed
Annexure-III
Page 5 of 7
45 400 Kv NCTPS - SVCTM-II 16-09-2016/00:39:00 16-09-2016/01:44:00
TRIPPED AT
SVCHATRAM END
ONLY
TANGEDCO/TANTRANSCO
TANTRANSCO: Temporary fault. AR
successful at NCTPS-II end (A-N fault, Zone-1)
and AR lock out at S.V.Chatram end (A,C-N
fault, Zone-1).
46 400 Kv HASSAN - UPCL- 2 18-09-2016/12:12:00 18-09-2016/12:45:00
TRIPPED DUE TO
DISTANCE
PROTECTION
PGCIL(SR-II)/UPCL/KPTCL To-be-discussed
47 400 Kv NELLORE - SPDR 2 20-09-2016/15:24:00 20-09-2016/18:14:00DISTURBANCE AT
SPDR ENDPGCIL (SR-I)/ PGCIL(SR-II) To-be-discussed
48 400 Kv KAYATHAR - KARAIKUDI -1 20-09-2016/12:10:00 20-09-2016/12:49:00R PHASE TO
GROUND FAULTTANTRANSCO/PGCIL To-be-discussed
49 400 kV N'SAGAR - CUDDAPPA -1 20-09-2016/09:55:00 20-09-2016/15:22:00HOT SPOT AT CVT
DROP JUMPERPGCIL(SR-I) To-be-discussed
50 400/220 kV ICT-1 AT HYDERABAD 21-09-2016/19:10:00 21-09-2016/22:54:00 220KV BUS-1 DEAD PGCIL(SR-I) To-be-discussed
51 400/220 kV ICT-3 AT HYDERABAD 21-09-2016/19:10:00 21-09-2016/22:56:00 220KV BUS-1 DEAD PGCIL(SR-I) To-be-discussed
52 400 kV GHANAPUR - MAMIDIPALLY 21-09-2016/19:10:00 21-09-2016/19:34:00TRIP CIRCUIT
FAULTYPGCIL(SR-I)/TSTRANSCO To-be-discussed
53 400 Kv GAJWEL - SINGARENI-2 22-09-2016/04:17:00
GENERATOR
DIFFERENTIAL
PROTECTION
ACTED
TSTRANSCO/ SCCL To-be-discussed
54 400/220 Kv ICT-3 AT MALKARAM 24-09-2016/01:42:00 OVER FLUX TSTRANSCO To-be-discussed
55 400 kV VIJAYAWADA - VEMAGIRI 3 24-09-2016/11:34:00 24-09-2016/13:12:00DT RECEIVED
FROM NUNNAPGCIL(SR-I)/ APTRANSCO To-be-discussed
56 400/220 Kv ICT-2 AT MALKARAM 24-09-2016/02:48:00 PRV OPERATED TSTRANSCO To-be-discussed
57 400/220 kV ICT-3 AT GAJWEL 24-09-2016/06:57:00 24-09-2016/14:08:00 EARTH FAULT TSTRANSCO To-be-discussed
58 400 Kv JEYPORE - GAZUWAKA -1 25-09-2016/19:12:00 25-09-2016/20:39:00
INTERZONE
PROTECTION
OPERATED
PGCIL(ER-I/ PGCIL (SR1) To-be-discussed
59 HVDC GAJUWAKA POLE 1 25-09-2016/19:12:00 25-09-2016/20:22:00
INTERZONE
PROTECTION
OPERATED
PGCIL(SR-I) To-be-discussed
60400 kV RAMAGUNDAM -
CHANDRAPUR27-09-2016/01:00:00 27-09-2016/02:27:00 B - N FAULT NTPC/PGCIL(SR-I) To-be-discussed
Annexure-III
Page 6 of 7
61 400/230 kV ICT-2 AT MADURAI 28-09-2016/20:25:00 29-09-2016/21:23:00 220 KV SIDE FAULT PGCIL (SR-II) To-be-discussed
62400/220 kV ICT-1 AT
VISAKHAPATNAM28-09-2016/23:03:00 28-09-2016/23:50:00 220 KV SIDE FAULT PGCIL (SR-I) To-be-discussed
63 400/230 kV ICT-1 AT MADURAI 28-09-2016/20:25:00 29-09-2016/21:27:00 220 KV SIDE FAULT PGCIL (SR-II) To-be-discussed
Annexure-III
Page 7 of 7