Power System Operation Corporation Limited
Western regional Load Despatch Centre
FLASH REPORT
MESSAGE NO- LD/05/445
DATE:-05/05/2015
Incident:
1. Date and Time: 04.05.2015 at 21:50hrs.
2. ANTECEDENT Conditions
I.
II.
Frequency of Grid
Event
Frequency ( Hz )
Time(hh:mm)
Pre incident
49.87
21:49
Post Incident
49.75
21:50
Demand Met
Sl.No
Area/Region
Demand Met(MW)
1
WR
39107
2
Gujarat
12275
3
Maharashtra
15257
4
Madhya Pradesh
6678
5
Chhattisgarh
3193
6
Goa
394
7
DD
262
8
DNH
684
9
ESIL
364
3. Elements affected:
Sr
Name of the Element
Outage Time
Restoration time
Reason
1
400 KV Chandrapur(2)-Warora-I
21:50/04.05.15
Under patrolling
R-Phase fault
2
400 KV Chandrapur(2)-Warora-II
21:50/04.05.15
00:04/05.05.15
Tripped at C’pur
No.
End only, on
Direct trip receive
3
400kV Wardha-Warora-I
21:50/04.05.15
23:00/04.05.15
Tripped at Warora
end, indications
yet to be
intimated
4
APML Tirora unit-3
21:50/04.05.15
01:08/05.05.15
On SPS operation
5
APML Tirora unit-5
21:50/04.05.15
S/O
On SPS operation
6
Chandrapur unit-4
21:50/04.05.15
S/O
Tripped on Jerk
7
Wardha-Mouda-II
22:01/04.05.15
23:03/04.05.15
B-ph fault
8
Mouda unit-1
22:01/04.05.15
S/O
Evacuation lines
trip
4. Incident:
Prior to the event 400kV Wardha-Warora-II was taken under emergency S/D due to breaker lockout
on oil leakage at Wardha end at 20:47hrs/04.05.15. As intimated by SLDC, severe rains and inclement
weather prevailed at C’pur, Warora and Wardha areas. C’pur-Warora-I tripped at both ends on r-ph
fault and C’pur-Warora-II triped at C’pur end only on D/T. Warha-warora-I tripped at warora end only.
With this warora is connected to Tirora only and entire generation of Tirora (2425MW injection) is
evacuated through 765kV Tirora-Koradi-Akola II D/C and 765/400kV Akola II ICT. As per SPS scheme if
power flow on Akola ICT is more than 2200MW for 500msec, one unit at Tirora 765kv (unit4 or unit5)
trips and then if flow on Akola ICT is more than 1800MW for 500msec one of units-1,2 and 3 trips. As
during this event the above conditions fulfilled and units -3 &5 at Tirora tripped on SPS. C’pur-4
tripped on Jerk.
At 22:01hrs 400kV Wardha-Mouda-II tripped on B-ph fault. Earlier at 20:23hrs Wardha-IEPL S/C
tripped on B-Ph fault and with tripping of Mouda-II line at 22:01hrs, Mouda power station lost path of
evacuation and the running unit-1 tripped.
5. Areas Affected By Disturbance : No load loss but LS of about 500MW implemented by
Maharashtra.
Power System Operation Corporation Limited
Western regional Load Despatch Centre
FLASH REPORT
Generation loss: 1250MW at Tirora at 21:50hrs, 150MW at c’pur at 21:50hrs and 280MW at Mouda at
22:01hrs, Total generation loss within a span of 11 minutes : 1680MW.
Critical loadings observed: flow on 400kv Khaperkheda-C’pur S/C rose to 737MW from 359MW.
6. Actions Taken:
Hydel generation increased by Maharashtra by about 1200MW and LS of 500MW implemented.
Wardha-Warora-I synchronized at Warora at 23:00hrs.
Detailed report is awaited from Maharashtra.
(K Muralikrishna)
(Shift Charge Manager)
Distribution:
S/I : NLDC, SLDC- GETCO, MPPTCL, MSETCL, CSPTCL, GOA, DD, DNH, Control
room: NTPC, CGPL
AGM/GM-WRLDC, MS-WRPC