1 POWER SYSTEM OPERATION CORPORATION LIMITED NATIONAL LOAD DESPATCH CENTRE B-9, QUTUB INSTITUTIONAL AREA NEW DELHI – 110016 Report dated 5 th May 2018 at 15:00hrs Sub: Load crash occurred in Northern Region due to thunderstorm on the night of 2 nd and 3 rd May 2018 On 2 nd May 2018, due to thunderstorm & dust storm, tripping of multiple 765 kV and 400 kV lines took place and around 14GW load crash has occurred in Northern region. In this connection, flash report prepared by NLDC and NRLDC is enclosed at Annexe-I and Annexe-II respectively. The current status of elements tripped in northern region is enclosed as Annexe-III. In continuation of the above report, the information regarding restoration of important lines /ICTs/Bus which went under outage on 2 nd May 2018 due to the dust/thunder storm is given below. S.No. Name of Element Outage date & Time Restoration date & time 1. 765/400KV ICT-1 at Agra 02-05-2018 (20:33) 18:03 (04.05.18) 2. 765/400KV ICT-2 at Agra 02-05-2018 (20:34) 19:33 (04.05.18) 3. 765 KV Agra – Gwalior line – 2 20:32 (02.05.18) 02:38 (05.05.18) 4. 765 KV Agra Bus-1 &2 02-05-2018 (20:34) 00:02 (05.05.18)
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POWER SYSTEM OPERATION CORPORATION LIMITED
NATIONAL LOAD DESPATCH CENTRE
B-9, QUTUB INSTITUTIONAL AREA
NEW DELHI – 110016
Report dated 5th May 2018 at 15:00hrs
Sub: Load crash occurred in Northern Region due to thunderstorm on the night of 2nd
and 3rd May 2018
On 2nd May 2018, due to thunderstorm & dust storm, tripping of multiple 765 kV and
400 kV lines took place and around 14GW load crash has occurred in Northern region.
In this connection, flash report prepared by NLDC and NRLDC is enclosed at Annexe-I
and Annexe-II respectively. The current status of elements tripped in northern region is
enclosed as Annexe-III.
In continuation of the above report, the information regarding restoration of important
lines /ICTs/Bus which went under outage on 2nd May 2018 due to the dust/thunder
storm is given below.
S.No. Name of Element Outage date & Time Restoration date & time
1. 765/400KV ICT-1 at Agra 02-05-2018
(20:33)
18:03
(04.05.18)
2. 765/400KV ICT-2 at Agra 02-05-2018
(20:34)
19:33
(04.05.18)
3. 765 KV Agra – Gwalior line – 2 20:32
(02.05.18)
02:38
(05.05.18)
4. 765 KV Agra Bus-1 &2 02-05-2018
(20:34)
00:02
(05.05.18)
2
In addition to the above, tower collapse has been reported due to the dust and
thunderstorm on 2nd May 2018 and earlier events on 11th April 2018 and 27th April
2018. The details of outages of trunk elements which are still under outage as on date
are given below:
S.No. Name of Element Tripping Time Reason of Outage/Remarks 1. 765kV Agra-Jhatikara line 18:29 (11.04.18) Line was already under breakdown due to
Tower damage from Loc. No. 173 to 177 since 11th April 2018. Further 03 nos. of towers damaged on 2nd May 2018 due to thunderstorm.
2. 765kV Agra-Fatehpur-1 20:34 (02.05.18)
Conductor damaged between loc. no 683 to 684 due to collapse of nearby tower of MTDC BNC- Agra.
3. 765kV Agra-Fatehpur Ckt-II 20:33 (02.05.18)
Switchyard equipments damaged at Agra
4. 765 KV Agra Gwalior line I 20:32 (02.05.18
9 Nos Tower collapsed near Agra(PG) on 2nd May 2018
5. 765 KV Agra – Aligarh line 20:32 (02.05.18)
4 Nos. of tower collapsed near Agra station on 2nd May 2018
Power System Operation Corporation Ltd. Northern Regional Load Despatch Centre
Dated: 03- May -2018
Report on Load Crash in Northern Grid from 13:54hrs/02-May-18 onwards
The Northern Region (NR) experienced demand crash on account of rain with thunderstorm. The event based upon data received and available at NRLDC is summarized below:
Load crash witnessed in the all the states of Northern Region.
High frequency and high voltage condition prevailed. Frequency touched 50.22Hz at 04:04hrs/03.05.2018.
The load of NR started reducing after 13:54hrs of 02.05.2018. Average demand crash of 11000 MW was observed during inclement weather conditions (night hours of 02-05-2018 to morning hours of 03-05-2018) as compared to the previous day.
The demand pattern of Northern Region and its state is attached as Annex-I. Schedule & Actual of affected NR state control areas is given at Annex-II. The Schedule & Actual IR exchange of NR is given at Annex-III
At 16:58hrs, complete station outage occurred at 400/220kV Muzaffarnagar (UP). Total 12 multiple element tripping event occurred in Northern Region, separate list of multiple element tripping along with category according to CEA grid standard is attached as Annex-IV
During the storm, complete 765kV Agra (PG) station became dead due to outage of multiple 765kV lines due to equipment damage or tower collapse.
At 20:35hrs, HVDC Agra-BNC Pole-2 also tripped due to tower collapse in HVDC line. HVDC Champa (WR) - Kurukshetra(NR) Pole -2 also went under outage at 22:17hrs of 2nd May 2018.
At 21:05hrs, 765kV Lalitpur-Fatehabad ckt-2 tripped. Lalitpur generation was hanging on only one ckt 765kV Lalitpur-Fatehabad ckt-2. .
At 22:12hrs, 765kV Aligarh-Orai ckt-1 tripped, after some time at 22:39hrs, 765kV Aligarh-Orai ckt-2 and 400kV Orai-Orai one circuit also tripped, it led to limitation on import by NR through Orai-Satna and Orai-Jabalpur D/C line.
Outage of 765kV Agra (PG) and 765kV Aligarh-Orai lines, Outage of one pole of Champa-Kurukshetra and one circuit of 765 Gwalior-Phagi severely deteriorated WR-NR interconnection corridor. The situation was further complicated with high wind generation in Rajasthan coupled with low demand and power rushing from NR to WR on 400kV Kankroli-Zerda and Bhinmal-Zerda lines.
The Railway traction supply was also affected in the incident due to tripping of lines from Agra station. The traction supply from 400/220 kV Auraiya station was interrupted from 00:36 Hrs to 01:50 Hrs of 03rd May 2018. 220kV Railway lines from 220kV Auraiya station was charged after bypassing over voltage protection at 220kV Auraiya (NTPC).
Total 36 no. of 400kV and above lines were manually opened to control the voltage and total 91 no. of 220kV and above elements (lines and ICTs) tripped during 02-03 May 2018. The list of tripped elements and opened on high voltage is attached as Annex-V. (some of state control area 220 kV lines may still not be in the list in view information receipt delay from SLDCs)
The frequency has remained above most of the time during inclement weather. Frequency plot from 08:00 Hrs (02-05-18) to 18:00 (03-05-18) Hrs is given below:
50 Hz
line
Summary of demand crash observed in respective states of Northern region:
States Load crash started at_ 02-05-2018
Maximum Demand crashed (MW)
J&K 11:47hrs 672(14:01hrs)
Punjab 12:28hrs 3105 (14:29hrs)
HP 14:08hrs 419(15:43hrs)
Haryana 14:39hrs 2930 (17:33hrs)
Uttarakhand 15:47hrs 1206(19:48hrs)
Delhi 16:24hrs 926(20:40hrs)
Uttar Pradesh 16:36hrs 8056 (04:00hrs of 03-05-2018)
Rajasthan 17:57hrs 2112 (20:54hrs)
NR demand crash 13:54hrs 14000 (04:00hrs)
The above table also indicates movement of inclement weather conditions from state to state.
Actions taken at Control Centre:
Warning about inclement weather condition was given to all the states in advance.
Alerts were issued to all concerned to reduce under-drawl and for backing down of
generation in order to control high frequency operation besides containing over-
voltages.
Immediate actions were taken to surrender power from ISGS generating stations &
ancillary down (RRAS down) were imposed.
The generation of ISGS thermal stations was backed down.
State control area generation was also reduced by SLDCs.
The pattern of regional thermal generation is attached at Annex-VI.
Present Condition (16:00hrs of 03rd May 2018):
System is in normal condition. The frequency is being in the IEGC stipulated band.
The Northern Regional demand is picking up and is around 38GW. The demand is still 4.1GW less than the normal day.
Due to complete outage of 765 kV Agra station which is centrally located in the grid, the import capability of northern region is adversely affected. The transmission towers of 765 kV Agra-Aligarh, 765 kV Kanpur-Varanasi-I & II, 400 kV Kanpur-Agra and MTDC BNC- Alipurduar- Agra are reported to be damaged. The equipment damage reported at 765/400 kV Agra substation. This
would delay in restoration of lines and thus limit the transfer capability in west to north corridor this has led to reduction in Total transfer capability (TTC) of Northern region import. The details of revision in TTC for the incident is given below:
It has been observed from the previous thunderstorm incidents that utilities are
manually shutting down their feeders during the storm to avoid collateral damage. It was
decided in last year summer preparedness meeting taken by Joint Secretary (Trans), MOP
that the states shall categorize all the feeders in two lists, one which do not require manual
opening (in view of safety requirements), and the other with safety concern. The list with
safety concern shall be progressively reduced.
This aspect has been discussed during different meetings at NRPC level as well. However,
the list from the states is yet to be received.
All utilities shall provide the list of manually opened feeders during this event along with the
detailed report to NRLDC at the earliest time. All entities shall also provide the DR/EL,
detailed report of the tripped elements/load crash along with the remedial actions taken/to
betaken.
Corridor Present TTC (MW)-Considering
outages
Reduction in TTC(MW) from earlier
level
WR-NR 7700 2600
ER-NR 4000 500
Simultaneous NR
Import
11000 3700
Annex-I
Annex-I
Annex-I
Northern Region Demand Pattern for (01-03 May 2018)
Maximum demand crash
at 04hrs of 3rd May 2018,
14GW
Annex-II
Schedule vis-à-vis Actual interchange
Annex-II
Schedule vis-à-vis Actual interchange
Annexure-III
Inter-Regional Exchange (NR-WR & NR-ER)
Annex-IV
S. No
Element Name Type
Voltage Level
Owner
Outage Revival Reason / Remarks
Category as per Grid Standard Date Time Date Time
1 Dhuri (400kV)-Rajpura (400kV)-1
Line 400 kV PSTCL 2/5/2018 13:36 2/5/2018 18:11 Phase to earth fault R-N
GI-2
2 Dhuri(400) 500 MVA ICT 3
ICT 400/220 kV
PSTCL 2/5/2018 13:36 2/5/2018 14:52 Tripped due to directional earth fault.
3 Patiala 125 MVAR B/R
Bus Reactor
400 kV PGCIL 2/5/2018 14:16 3/5/2018 0:56 Tripped due to Bad weather.
GI-2
4 Patiala 315 MVA ICT 1
ICT 400/220 kV
PGCIL 2/5/2018 14:17 3/5/2018 0:27 Tripped due to Bad weather.
5 Ataur(UP)-Muzaffarnagar(UP)
Line 400 kV UPPTCL 2/5/2018 16:58 2/5/2018 19:11
Manually tripped due to sparking observed in switchyard.
GD-1
6 Alaknanda HEP - Muzaffarnagar - 2
Line 400 kV UPPTCL 2/5/2018 16:58 2/5/2018 18:27
Manually tripped due to sparking observed in switchyard.
7 Muzaffarnagar-Vishnuprayag 1
Line 400 kV UPPTCL 2/5/2018 16:58 2/5/2018 20:37
Tripped due to B-Phase CB of Muzaffarnagar-Vishnuprayag burst at Muzaffarnagar end.
8 Muzaffarnagar(UP)-Roorkee(PG)
Line 400 kV UPPTCL 2/5/2018 16:58 2/5/2018 18:27
Manually tripped due to sparking observed in switchyard.
9 Bareilly II (PG) - Kashipur (UTT) - 1
Line 400 kV PGCIL 2/5/2018 16:58 2/5/2018 21:22
E/S/D availed due to sparking observed in R-Phase isolator at Kashipur end.
10 Muzaffarnagar 315 MVA ICT 2
ICT 400/220 kV
UPPTCL 2/5/2018 16:58 2/5/2018 18:31
Manually tripped due to sparking observed in switchyard.
11 Muzaffarnagar 315 MVA ICT 1
ICT 400/220 kV
UPPTCL 2/5/2018 16:58 2/5/2018 18:29
Manually tripped due to sparking observed in switchyard.
12 Muzaffarnagar 315 MVA ICT 3
ICT 400/220 kV
UPPTCL 2/5/2018 16:58 2/5/2018 18:49
Manually tripped due to sparking observed in switchyard.
13 Muzaffarnagar 400 kV Bus 1
BUS 400 kV UPPTCL 2/5/2018 16:58 * *
Manually tripped due to sparking observed in switchyard.
14 Muzaffarnagar 400 kV Bus 2
BUS 400 kV UPPTCL 2/5/2018 16:58 * *
Manually tripped due to sparking observed in switchyard.
15 Ballabgarh(PG)-Bamnauli(DTL) 2
Line 400 kV DTL 2/5/2018 17:23 2/5/2018 19:45 Tripped due to bad weather.
49 Agra‐Kanpur 400 kV PGCIL 2/5/2018 22:23 * *Phase to earth faultTripped on B‐N Fault. One tower partially damaged.
50 Orai 400(UP)‐Orai 765(PG) 2 400 kV PGCIL 2/5/2018 22:38 3/5/2018 7:31Tripped during thunder storm, flag details awaited.
51 Orai 400(UP)‐Orai 765(PG) 1 400 kV PGCIL 2/5/2018 22:39 3/5/2018 1:05Tripped during thunder storm, flag details awaited.
52 Bhilwara‐Chhabra 1 400 kV RRVPNL 2/5/2018 23:40 3/5/2018 1:02 Tripped due to LBB Optd at Bhilwara end53 Ajmer II(RVPNL)‐Bhilwara 400(RVPNL 400 kV RRVPNL 2/5/2018 23:40 3/5/2018 6:27 Tripped due to LBB Optd at Bhilwara end
S.No Element NameVoltage Level Owner Reason / RemarksOutage Revival
54 Dhuri(400) 500 MVA ICT 3 400/220 kV PSTCL 2/5/2018 13:36 2/5/2018 14:52 Tripped due to directional earth fault.
55 Patiala 315 MVA ICT 1 400/220 kV PGCIL 2/5/2018 14:17 3/5/2018 0:27Tripped during thunder storm, flag details awaited.
56 Rajpura (400kV) 500 MVA ICT 3 400/220 kV PGCIL 2/5/2018 14:23 2/5/2018 16:04 Tripped due to bad weather.57 Fatehpur 315 MVA ICT 1 400/220 kV PGCIL 2/5/2018 21:07 3/5/2018 0:46 Tripped due to storm, details awaited.
58 Patiala 125 MVAR B/R 400 kV PGCIL 2/5/2018 14:16 3/5/2018 0:56Tripped during thunder storm, flag details awaited.
59 Mandola(PG)‐Narela(DTL) 2 220 kV DTL 2/5/2018 9:14 2/5/2018 18:20ESD for replacement of porcelain insulator with polymer
60 Bairasuil(NHPC)‐Pong(BBMB) 220 kV PGCIL 2/5/2018 11:13 2/5/2018 11:29Tripped due to Bus bar protection of Bus‐1 operated due to blast of B‐ph CT of GT‐3.