भारत सरकार विुत मंालय उर ेीय विुत सवमवत 18-ए, श.जीत ससह माग , कटिाररया सराय, नई दिली- 110016 Government of India, Ministry of Power Northern Regional Power Committee 18-A, S. Jeet Singh Marg, Katwaria Sarai, New Delhi-110016 No. NRPC/OPR/107/1/2017/ 1518-56 Dated: 03.02.2017 FAX MESSAGE To Members of Protection Sub-Committee (As per List) Sub : Grid incidents/ Disturbances from July-December, 2016 A summarized status of the Grid Incidents/Disturbances occurred in Northern region from July-December, 2016 is enclosed as Annex (soft copy available on http://bit.ly/2kzzyPA ). These incidents will be discussed in 33 rd PSC meeting scheduled to be held on 22.02.2017. Utilities are requested to submit the detailed report along with measures being/already taken to avoid the recurrence of tripping in future to NRPC with a copy to NRLDC. The utilities, who have submitted the detailed report, are requested to submit the action taken/being taken along with the timeline for the same. Sd/- Naresh Kumar E.E. (O) फोन – 26868681, 26967842 फे स Fax : 26865206 ई मेल e- mail: [email protected]वेबसाईट Website : www.nrpc.gov.in
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भारत सरकार ... · नई दिल्ल - 110016 Government of India, Ministry of Power Northern Regional Power Committee 18-A, ... PGCIL, New Delhi, Fax-011-26601079
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भारत सरकार
विद्युत मंत्रालय
उत्तर क्षेत्रीय विद्युत सवमवत
18-ए, श.जीत ससह मार्ग, कटिाररया सराय,
नई दिल्ली- 110016
Government of India, Ministry of Power
Northern Regional Power Committee 18-A, S. Jeet Singh Marg, Katwaria Sarai,
The jumper of 220/132kV ICT at Barmer snapped resulting in bus bar protection operation. Complete station become dead. The evacuation lines from Akal also tripped resulted in tripping of wind generation.
6-Jul-16 00:19400kV Makhu-Nakodar ckt 1&2 and 400kV Nakodar-Rajpura (TH) ckt 1 tripped at 00:19hrs. 400kV Dhuri(400kv)-Rajpura (TH) ckt 2 tripped at 00:22hrs. Phase to earth fault reported.
GI2 Punjab Yes Yes Yes
9 Adani Yes Yes Yes
10 Haryana Yes Yes NA
11 Adani Yes Yes Yes
12 Haryana Yes Yes NA
13 7 1)400/220kV Muradnagar New 240 MVA ICT-12)400/220kV Muradnagar New 240 MVA ICT-2
15-Jul-16 05:43400/220kV Muradnagar New 240 MVA ICT 1 tripped due to fire. ICT-2 also tripped along with this .
GD1 UP Yes Yes Yes
14 81)400kV Agra-Sikar ckt 12)400kV Agra-Bhiwadi ckt 13)400kV Agra-Jaipur South
17-Jul-16 03:47400kV Agra-Sikar ckt 1, 400kV Agra-Bhiwadi ckt 1 and 400kV Agra-Jaipur South tripped on overvoltage.
GI2 POWERGRID Yes Yes Yes
15 9
1)400kV Muzaffarnagar-Srinagar 2)400 KV Vishnuprayag -Muzaffarnagar3)All running units at Srinagar and Vishnuprayag HEP
18-Jul-16 08:10
At 04:18 hrs due to O/V Muzaffarnagar-Srinagar line tripped resulting in power of Srinagar HEP to flow to Muzaffarnagar via Vishnuprayag and caused system disturbance/power swing. 400 KV Vishnuprayag -Muzaffarnagar line tripped from Vishnuprayag end only and running units at Vishnuprayag and Srinagar tripped. Similar incident also took place at 06:15hrs and 08:10hrs.
22-Jul-16 16:35Bus bar protection operated at Aligarh and 400kV Aligarh-Muradnagar ckt 1 & 400kV Aligarh-Panki tripped.
GI2 UP Yes Yes Yes
19 12
1)400/220kV 315MVA ICT #1 2)400/220kV 315MVA ICT #33)400/220kV 500MVA ICT #2 at Sarnath(UP)4)220kV Sarnath-Gajokhar line
23-Jul-16 13:52
An earth fault occurred on 220 KV Sarnath-Gajokhar line. Breaker tripped but with delay and due to this the fault was sensed by the E/F relays of ICT's. SPS also issued tripping command to the 220 KV Harua line because of delay in the tripping of 220 KV Gajokhar line. 400/220kV 315MVA ICT #1 and #3 and 500MVA ICT #2 tripped.
21-Jul-16 18:45220kV Amritsar(PG)-Khassa(PSEB) ckt 1 tripped due to snapping of conductor. 220kV Amritsar(PG)-Khassa(PSEB) ckt 2 tripped along with this.
400kV Baglihar(JK)-Kishenpur(PG) ckt 1&2 and 400kV Dulhasti(NHPC)-Kishenpur(PG) tripped at 22:42hrs.220kV Kishenpur(PG)-Mirbazar(JK) and 220kV Kishenpur(PG)-Ramban(JK) tripped at 23:08hrs.Phase to earth fault reported.
Busbar protection operated at Rajpura due to falshover in corona ring of ICT #4 and 400kV Rajpura (400kV)-Rajpura (TH)-2, 400kV Bhiwani (BBMB)-Rajpura (400kV) (PSEB), 400kV Dhuri (400kV)-Rajpura (400kV)-2 & 400kV Dehar-Rajpura tripped.
1)400/220kV, 315MVA ICT-I at Bamnauli 2)400/220kV, 500MVA ICT-II at Bamnauli 3)400/220kV, 500MVA ICT-III at Bamnauli 4)400/220kV, 315MVA ICT-IV at Bamnauli 5)220kV Bamnauli-DIAL Ckt-I6)220kV Bamnauli-DIAL Ckt-II7)220kV Bamnauli-Papankalan II Ckt-I 8)220kV BTPS-Mehrauli Ckt-II 9)220/66kV 100MVA Pr. Tr-I at Papankalan I10)220/66kV 100MVA Pr. Tr-II at Papankalan I11)220/66kV 100MVA Pr. Tr-IV at Najafgarh
4-Aug-16 12:24
Relay maloperated at Bamnauli station and all 220 KV lines from 400/220KV Bamnauli got tripped & All 400/220 KV ICTs were connected from 400KV side.At the same time 220kV BTPS-Mehrauli-II line got tripped due to over loading, As 220kV BTPS-Mehrauli-I was under s/d.
B-Phase jumper of Wave Trap of Muradnagar interconnector ckt-2 at 220 KV Muradnagar Substation snapped and resulted in L3-E fault seen at 400 KV Muradnagar S/S in Z2. This line fault overloaded the 03 nos. of 315 MVA ICTs of 400 KV Muradnagar S/S. Thus SPS operated and resulted in trippings of 220 KV Muradnagar-Muradnagar(II) ckt-1 & 2, 220kV Loni-Muradnagar ckt 2 and 220kV Muradnagar-Sahibabad ckt 1 tripped.
Busbar protection operated at Bareilly(UP). 400kV Bareilly(UP)-Bareilly(PG) ckt-1 & 2, 400kV Bareilly-Unnao ckt 2, 220kV Cbganj(UP)-Tanakpur(NHPC) and 220kV Bareilly(UP)-Dhauliganga(NHPC) tripped.
GD1
13
1)765kV G.Noida 765(UP)-Meerut(PG) ckt-12)765 kV (3*80) 240 MVAR Line Reactor (Switchable) of Gr.Noida 765 ckt 1 at Meerut PG end
23-Jul-16 15:57765kV G.Noida 765(UP)-Meerut(PG) 1 and 765 kV (3*80) 240 MVAR Line Reactor (Switchable) of Gr.Noida 765 ckt 1 at Meerut PG tripped due to fire in LR.
GI2
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9-Aug-16 10:40400kV Dhuri(400kv)-Talwandi Sabo ckt 1&2 tripped due to PLCC maloperation at 10:40hrs. Both ckts tripped again at 13:04hrs during protection testing work.
GI2 Punjab Yes Yes Yes
37 27
1)400kV Jodhpur II-Rajwest 2 2)400kV Barmer-Rajwest 1 3)Rajwest TPS unit #14)Rajwest TPS unit #25)Rajwest TPS unit #36)Rajwest TPS unit #57)Rajwest TPS unit #7 9)Rajwest TPS unit #8
9-Aug-16 23:52
400kV Jodhpur II-Rajwest 2 and 400kV Barmer-Rajwest 1 tripped at 23:52 hrs. 400kV Jodhpur II-Rajwest 1 already tripped at 18:46hrs. At same time Rajwest TPS unit #1, #2, #3, #4, #5, #7 and #8 tripped.
1)400kV Chamera I(NHPC)-Jalandhar(PG) ckt-12)400kV Chamera I(NHPC)-Jalandhar(PG) ckt-23)180MW Chamera I unit #14)180MW Chamera I unit #25)180MW Chamera I unit #36)100MW Chamera II unit #2
27-Aug-16 07:16
400kV Chamera I(NHPC)-Jalandhar(PG) ckt 1 & 2 tripped on phase to phase fault. At the same time 180MW Chamera I unit #1, #2 & #3 tripped on differential protection operation. 100MW Chamera II unit #2 also tripped along with this.
CT blasted at Barmer. Over voltage at Jodhpur occurred after tripping of 220kV Barmer-Akal & 220kV Barmer-Rajwest line. 400kV Jodhpur-Kankroli(PG)-1, 400kV Jodhpur-Merta-2, 400kV Jodhpur-Rajwest-1, 400kV Akal-Barmer-2 also tripped.
GI2
33 1)400kV Anta-Chabra ckt-12)400kV Kawai-Chabra
19-Aug-16 20:45 400kV Anta-Chabra ckt-1 and 400kV Kawai-Chabra tripped. GD1
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220kV Pragati-Sarita Vihar ckt-1 and 2 tripped on distance protection. Bus coupler at Pragati was open. This caused islanding of Pragati units from grid and units came on house load.
31-Aug-16 23:27220kV Loni-Muradnagar, 220kV Muradnagar-Muradnagar II ckt-1 and ckt-2 tripped. Phase to earth fault is reported.
GD1 UP Yes Yes Yes
61 45
1)400kV Jodhpur II-Rajwest ckt-22)400kV Rajwest TPS unit #33)400kV Rajwest TPS unit #54)400kV Rajwest TPS unit #65)400kV Rajwest TPS unit #76)400kV Rajwest TPS unit #8
1-Sep-16 19:19400kV Jodhpur II-Rajwest 2 tripped. During synchronization of this line, all running units of Rajwest TPS (#3, #5, #6, #7 & #8) tripped.
3-Sep-16 13:26400kV Aligarh-Muradnagar ckt-1 and 400kV Aligarh-Panki tripped. R-phase toearth fault is reported.
GI2 UP Yes Yes Yes
63 47
1)220kV Rewa Road-Allahabad ckt-I2)220kV Rewa Road-Allahabad ckt-II3)400kV Bara TPS-Allahabad Rewa Road ckt-14)400kV Bara TPS-Allahabad Rewa Road ckt-25)400kV Panki-Allahabad Rewa Road6)Bara TPS 660MW unit #17)Bara TPS 660MW unit #28)400 KV Rewaroad - Obra line9)220 KV Rewa Road - Mirzapur10)220 KV Rewa Road - Obra ckt-111)220 KV Rewa Road - Obra ckt-2
5-Sep-16 17:11
Phase to earth fault occurred in 220kV Rewa Road-Allahabad ckt-II but fault could not be cleared at Rewa Road stations. LBB also not operated so all 220kV feeders at Rewa road tripped from remote end. 400kV Bara TPS-Allahabad Rewa Road ckt-1 tripped in zone-3 and ckt-2 tripped on power swing. 400kV Panki-Allahabad Rewa Road also tripped on power swing. Bara TPS unit #1 & #2 of 660MW tripped due to loss of evacuation lines.
765kV Bhiwani -Meerut and 765/400kV Bhiwani 1000 MVA ICT 2 tripped on PRD protection operation. 400kV Bhiwani(PGCIL)-Mohindergarh(Adani)-1 tripped on DT received from Bhiwani end.
15-Sep-16 17:35400/220kV Gorakhpur 315 MVA ICT-1 and 2 tripped on busbar protection operation.
GD1 UP Yes Yes Yes
73 POWERGRID Yes Yes Yes
74 Delhi Yes Yes Yes
75 POWERGRID Yes Yes Yes
76 Delhi Yes Yes Yes
77 54 1)765kV Kanpur New-Jhatkara2)Kanpur New 765 kV Bus 2
20-Sep-16 11:08765kV Kanpur New-Jhatkara line and Kanpur New 765 kV Bus 2 tripped. SF6 gas leakage observed in density monitor No. 712 GP1 (Jhatikara Line Main Bay) of Bus II section).
27-Sep-16 13:25All running units of Parichha TPS and one unit of Lalitpur TPS tripped due to evacuation problem after tripping of 220kV Orai-Kanpur line.
GD1 UP Yes Yes Yes
83 58 1)800kV HVDC Agra-BNC pole 12)800kV HVDC Agra-BNC pole 2
30-Sep-16 11:00Due to mal-operation of Smoke detection system, 800kV HVDC Agra-BNC bipole tripped.
GI2 POWERGRID Yes Yes Yes
84 POWERGRID Yes Yes Yes
85 Delhi Yes Yes Yes
1)220kV Ballabhgarh-BTPS-I 2)220kV Ballabhgarh-BTPS-II 3)220Kv Ballabhgarh-Dadri4)220Kv Ballabhgarh-Samayapur-I5)220Kv Ballabhgarh Samayapur II
At 14:38hrs 400/220kV ICT-4 at Ballabhgarh tripped due to blast in Y-ph CB. At 15:12 hrs 400/220kV ICT-2 was made off
26-Sep-16 10:28220kV Wagoora-Pampore D/C tripped reportedly on phase to earth fault.
GD1
551)400kV Balia-Biharsharif ckt-13)400kV Balia-Biharsharif ckt-22)Kanpur New 765 kV Bus 2
24-Sep-16 11:50400kV Balia(PG)-Mau(UP) ckt-1 tripped on R phase to earth fault. 400kV Balia-Biharsharif ckt-1 & 2 also tripped after this on over votage stage II protection operation
400 kV Bamnauli-Ballabgarh D/C tripped due to B-ph LA damage at Bamnauli. Around the same time Jumper of 220kV Mehrauli-BTPS-2 snapped. Load of Naraina, DAIL and 3 feeders of Dwarka were lost.
16-Sep-16 04:52400kV Ballabgarh(PG)-Bamnauli(DTL) D/C tripped reportedly on phase to earth fault.
GD1
49
1)400kV Dehar (BBMB)-Rajpura(PSEB)2)400/220kV Dehar 250 MVA ICT3)165MW Dehar unit #3 4)165MW Dehar unit #4
7-Sep-16 18:55400kV Dehar (BBMB)-Rajpura(PSEB), 400/220kV Dehar 250 MVA ICT and 165MW Dehar unit #3 & #4 tripped.
GD1
48
1)400/220kV Ballabgarh 500 MVA ICT-12)400/220kV Ballabgarh 500 MVA ICT-33)400/220kV Ballabgarh 315 MVA ICT-24)400kV Ballabhgarh-Bamnauli5)400kV Ballabhgarh-Maharanibagh 6)400kV Dadri-G.Noida7)Faridabad GPS unit #18)Faridabad GPS unit #29)Faridabad GPS unit #3 10)Multiple 220kV feeders at Samaypur
6-Sep-16 19:44
Multiple 220kV feeders at Samaypur along with 400/220kV Ballabgarh 500 MVA ICT-1 & 315MVA ICT-3, 400kV Ballabhgarh-Bamnauli, 400kV Ballabhgarh-Maharanibagh & 400kV Dadri-G.Noida tripped due to bus-2 fault at 220kV Samaypur. Faridabad GPS unit #1, #2 & #3 also tripped.
GD1
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by PGCIL as a precautionary measure. This led to tripping of 220kV Ballabhgarh-Samaypur Ckt-I, II & III, 220kV Ballabhgarh-BTPS-I &II, 220kV Ballabhgarh-Dadri and 220kV Samayapur-FGPP-I &II.
GD1
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(Tripped/Manually opened)
OutageEvent
(As reported)
Category as per CEA Grid
Standards
89 POWERGRID Yes Yes Yes
90 UP Yes Yes NA
91 Punjab Yes Yes NA
92 BBMB Yes Yes Yes
93 UP Yes Yes Yes
94 POWERGRID Yes Yes NA
95 63
1)400kV Deepalpur-Kabulpur ckt-12)315MVA 400/220kV ICT #2 at Deepalpur(HVPNL)3)400kV Deepalpur-Kabulpur ckt-24)315MVA 400/220kV ICT #1 at Deepalpur(HVPNL)
7-Oct-16 12:53
400kV Deepalpur-Kabulpur ckt-1, 315MVA 400/220kV ICT #2 at Deepalpur(HVPNL) tripped. Again at 13:20hrs, 400kV Deepalpur-Kabulpur ckt-2, 315MVA 400/220kV ICT #1 tripped.
400kV Agra(UP)-Fatehabad 765 (UP) ckt-1 tripped on B phase to earth fault due to which 400kV Fatehabad 765(UP)-Muradnagar New(UP) tripped. 765kV Fatehabad 765(UP)-Lalitpur TPS(LPGCL) ckt-1 along with both 315MVA Lalitpur 765/220kV ICTs also tripped. Due to loss of evacuation path, Lalitpur unit#1 tripped.
10-Oct-16 00:58R-phase CT of 400kV Orai-Paricha got damaged and line tripped. 400kV Mainpuri(PG)-Orai(UPPTCL) ckt-1 tripped along with this.
GI2
62
1)400 kV Anpara-Mau line2)400kV Anpara-Sarnath3)400kV Sarnath-Azamgarh4)400kV Mau-Azamgarh5)400kV Mau-Balia I 6)400kV Mau-Balia II
4-Oct-16 11:20
During opening of 400 kV Anpara-Mau line, R-ph CB at Mau blasted.This fault could not be cleared at Mau end hence resulted into tripping of all 400kV lines emanating from Mau from remote end. 400kV Anpara-Sarnath and 400kV Sarnath-Azamgarh also tripped.
R-phase CT of Bus coupler at 220kV Jamalpur blasted. It led to bus fault. Numerical bus bar protection didn’t operate at 220kV Jamalpur station. It resulted into tripping of all 220kV feeders from remote end in Z-2 or Z-3.
2-Oct-16 12:30 B-N fault occurred. Multiple feeders from Mainpuri(PG) tripped.
GI2
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(Tripped/Manually opened)
OutageEvent
(As reported)
Category as per CEA Grid
Standards
103 68 1) 800kV Agra-BNC bipole 13-Oct-16 01:53800kV HVDC Agra-BNC bipole tripped due to valve cooling problem.
GI2 POWERGRID Yes Yes Yes
104 Punjab Yes Yes Yes
105 POWERGRID Yes Yes Yes
106 701)765kV Fatehabad (UP)-Lalitpur TPS(LPGCL) ckt-12)all 220kV lines from Lalitpur 3)Generation at Lalitpur
19-Oct-16 15:39765kV Fatehabad 765(UP)-Lalitpur TPS(LPGCL) ckt-1 tripped. Due to which all 220kV lines from Lalitpur along with Lalitpur generation tripped.
GD1 UP Yes Yes Yes
107 71
1)765kV Fatehabad 765(UP)-Lalitpur TPS(LPGCL) ckt-12)all 220kV lines from Lalitpur 3)Generation at Lalitpur
20-Oct-16 13:11765kV Fatehabad 765(UP)-Lalitpur TPS(LPGCL) ckt-1 tripped. Due to which all 220kV lines from Lalitpur along with Lalitpur generation tripped.
23-Oct-16 11:55B-phase CTs of 220kV Bus-Coupler Burnt and created bus fault on Bus-2. All feeders connected to bus tripped from Dausa end. 220kV Dausa-Bassi 1 & II ltripped on intertriping signal.
25-Oct-16 12:48Main bay of 400kV Abdullapur-panchkula ckt-1 was under S/D for some work. 400kV Abdullapur Bus-1 and 400kV Abdullapur-Panchkula ckt-1 tripped.
GI2 POWERGRID Yes Yes Yes
110 DelhI Yes Yes Yes
111 POWERGRID Yes Yes Yes
112 751)unit #7 at Harduaganj TPS (UP)2)unit #9 at Harduaganj TPS (UP)3)220/132kV ICT at Harduaganj TPS (UP)
30-Oct-16 03:22unit #7 & #9 tripped along with 220/132kV ICT due to accident made with Monkey.
During opening of 400kV Sarnath-Varanasi line busbar protection of bus-II operated. This resulted in tripping of 400kV Anpara-Sarnath 2, 400/220kV Sarnath 315 MVA ICT 1 & 2.
GD1 UP Yes Yes Yes
116 POWERGRID Yes Yes NA
117 UP Yes Yes NA
78
1)400kV Bus-1 & 2 at Dadri Thermal2)HVDC Rihand Dadri Pole 1 (Pole II already under S/D)3)Dadri Thermal 1: one unit generating 210 MW4) Dadri Thermal 2: 2 units generating 850 MW5)Dadri Gas –(2GT+1ST) generating around 400 MW6)400kV D d i M l k tl kt
10 N 16 10 49
At 10.49 Hrs, during shutdown of 400kV Bus-A at AC side of HVDC Dadri station, another bus inadvertently tripped due to wrong switching operation. It resulted into Bus fault for Bus-B
400kV Koldam(NTPC)-Parbati Pool(PG), 400kV Koldam(NTPC)-Nalagarh(PG) ckt-1 and 400kV Parbati pool(PG) - Parbati(3)(NHPC) bypassing Parbati(2) tripped on over voltage.
GI2
74 1)400kV Ballabgarh-Bamnoli ckt-2 29-Oct-16 12:06Emergency S/D of 400kV Ballabgarh-Bamnoli ckt-1 availed and while opening the line ckt-2 got tripped. Load loss occurred.
18-Oct-16 11:29220 kV Ludiana-Jagrao line tripped due to fault in line near wave trap at Ludhiana S/S. 400/220kV Ludhiana 315 MVA ICT 1 and 2 tripped aloong with this.
GD1
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(Tripped/Manually opened)
OutageEvent
(As reported)
Category as per CEA Grid
Standards
118 NTPC Yes Yes Yes
119 Delhi Yes Yes NA
120 POWERGRID Yes Yes NA
121 UP Yes Yes Yes79 1)220kV Meerut(PG)-Modipuram(UP) 1
and all the main CBs connected to Bus-B also tripped. Both 400kV AC buses of HVDC Dadri tripped. Case-2 of Rihand-Dadri SPS operated and shed the load group C&D.
GD1
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131 851)400kV Kanpur(765)-Kanpur ckt-12)All elements connected at 765/400kV Kanpur(PG)
25-Nov-16 16:57
LA of 400kV Kanpur(765)-Kanpur ckt-1 at Kanpur(765) end blasted resulting complete outage of whole 765/400kV Kanpur(PG) station. 400kV Kanpur(765)-Kanpur ckt-2 was under S/D.
1)400kV Dehar(BBMB)-Rajpura(PSTCL)2)400kV Bhiwani(BBMB)-Rajpura(PSTCL)3)400kV Rajpura(PSTCL)-Rajpura TPS(PSEB)4) Dehar HEP(BBMB) unit #4
21-Nov-16 21:17
On bus-bar operation at Rajpura(PSTCL), 400kV Dehar(BBMB)-Rajpura(PSTCL), 400kV Bhiwani(BBMB)-Rajpura(PSTCL), 400kV Rajpura(PSTCL)-Rajpura TPS(PSEB) along with unit #4 at Dehar HEP(BBMB) tripped.
GD1
831)400kV Maharanibagh-Ballabhgarh 2)220kV Maharanibagh-Lodhi Road ckt-13)220kV Maharanibagh-Truma centre ckt-2
21-Nov-16 01:17400kV Maharanibagh-Ballabhgarh tripped on overvoltage at 01:17hrs. 220kV Maharanibagh-Lodhi Road ckt-1 and 220kV Maharanibagh-Truma centre ckt-2 tripped along with this.
In antecedent condition, 400kV Rajpura-Dehar was already opened on High voltage.400kV Rajpura-Nakodar ckt-2 tripped at 02:54hrs. 400kV Rajpura-Nakodar ckt-1, 400kV Rajpura-Bhiwani and 400kV Rajpura-Rajpura(Th) tripped at 03:08hrs due to fog. Due to loss of evacuation path, 400kV Rajpura Th unit #2 generating around 350MW tripped.
In antecedent condition, 400 kV Talwandi Sabo-Nakodar, 400 kV Talwandi Sabo-Dhuri 1 & 2 were already opened on over voltage. 400 kV Talwandi Sabo-Moga tripped at 01:38hrs. 400 kV Talwandi Sabo-Mukatsar 1&2 tripped at 03:08hrs due to fog. Due to loss of evacuation path, 400kV Talwandi Sabo unit #1 & 2 generating around 650MW tripped.
All 220kV feeder of Kashmir valley connected to Wagoora station (220kV Wagoora-Pampore double circuit and 220kV Wagoora-Zaiankote double circuit) unloaded. It resulted into increased in the loading at 220kV Kishenpur-Ramban and Kishenpur-Mirbazar. 220kV Kishenpur-Ramban and Kishenpur-Mirbazar circuit tripped on cascade. Multiple 400kV elements connected to Kishenpur, Wagoora, New Wanpoh also tripped on over voltage protection or DT received from remote end.
GD1
107
1)400kV Meerut(PG)-Koteshwar Pool ckt-22)400kV Koteshwar Pool-Tehri ckt-13)400kV Koteshwar Pool-Tehri ckt-24)400kV Koteshwar Pool-Koteshwar ckt-15)400kV Koteshwar Pool-Koteshwar ckt-26)400kV Tehri unit #17)400kV Tehri unit #28)400kV Tehri unit #39)400 koteshwar unit #1
18-Dec-16 19:20
In antecedent condtition, 400kV Meerut(PG)-Koteshwar Pool ckt-1 was under planned outage. At 19:20hrs, 400kV Meerut(PG)-Koteshwar Pool ckt-2 tripped due B-phase isolator problem at meerut end. 400kV Koteshwar Pool-Tehri and 400kV Koteshwar Pool-Koteshwar both ckts also tripped at same time. Due to loss of evacuation path, Tehri and Koteshwar gen tripped.