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8/12/2019 Mop-storm Report 31-05-2014
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ReportonLoadCrashinNorthernGridduringtheeveningof30thMay2014Reporttime:31.05.14/15.00hrs
IncidentSummary: On30thMay2014, ineveninghours,NorthernGridexperienced aheavydemand crash
from16:00hrsto19:00hrsduetorain,duststorm/thunderstorm inmainlyDelhi,UP,
Haryana &Uttarakhand. The demand started reducing at around 16:40hrs and was
minimalataround17:15hrs.Thehugedemandreductionresultedinawidespreadhigh
voltagethroughoutthesystem.Thesystemfrequencyalsotouchedahighof50.65Hz
at17:05hrs.During thisperiod68nos.AC transmission linesalongwithoneHVDCBi
pole tripped. This incident led to load crash of about 8000MW inNorthern Region,
including3500MWinDelhi.
At
around
1640hrs,
the
Northern
Region
demand
started
declining
steadily
at
a
rate
of
~200MW/minandreachedto32780MWat1715hrs,around8000MWlessthanthatof
thepreviousdayDemandof same time.Delhi,UP,Haryana&Uttarakhand being the
majorStateControlAreasinwhichthisabruptdemandreductionwasobserved.
Thisdemandreductionalsoresultedinhighfrequencyandhighvoltageinthesystem.WeatherReport:
AsperIMD,continuousthunderandlightning,spellofheavyrainassociatedwithwind(having
speed
more
than
75KMPH)
affected
most
part
of
the
Northern
States
BasedontheweatherforecastandNOWCASTofIMD,alltheconstituentswerealertedaboutthelikelihoodofthestorminNorthernregion
Actionstaken:1. AlertSMSwereissuedtoallconcernedStatesLoadDespatchcentresforbackingdown
of generation in order to control high frequency operation besides containing over
voltages.The backing down of generation at InterState Generating stations
(ISGS)/RegionalEntitygeneratorswascarriedout.Thus,backingdownof theorderof
around 2700MW was achieved in Northern region. Generation was also reduced
throughoutthecountrytomeettheexigencies.
2. All the constituents& generating stations cooperated to combat the situation in therealtime.
3. Outof68linestrippedduringtheincident,49lineshavebeenrestored,includingtheHVDCline.
4. Supplyhasbeenrestoredgraduallyinallthestates.
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5. InDelhi,therestorationoflineswastakenuponwarfootingandtopmostprioritywasaccordedforrestoringpoweremergencyservicessuchasHospitals,DelhiMetro,water
treatmentplantsandNDMCarea.Presently,about3800MW load isbeingmetand a load
restrictionofabout200MWisbeingexperiencedinPappankala,Gopalpur&Rohini.
6. 2nos.of765kVandone400kV lines where therehavebeendamages to towersarebeingrestored
by
POWERGRID
by
10
June,
2014.
However,
non
availability
of
these
lines
is
not
affectingthepowersupplyto thestates,asalternatepathsareavailable.
7. Honble Minister of State (Independent) reviewed the situation participated by officials ofMinistryofPowwer,Govt.ofDelhi,DTL,,DISCOMsofDelhi,CEA,POWERGRID&POSOCO.
8. Officers of Delhi sought assistance from POWERGRID for ERS for early restoration ofthefollowing220kVlines,whichareaffectingthepowersupply
220kVMandolaGopalpurD/c1 towers restorationby1/6/14(thruERS) 220kVBamnauliPappankalan D/c4 towers BeingsurveyedbyDTLfordeploying 220kVBawanaRohiniD/c 5towers ERSMinistryofPowerassuredallthepossiblehelptoDelhi inearlyrestorationof the linesand
directedPOWERGRIDtoextendallcooperationinthisregard.
9. MoSPappreciatedtheeffortsofalltheofficialsofMinistryofPower,LoadDespatchcentresandUtilities, includingofDelhi,fortimelyaction incombatingtheunexpectedsituationcausedby
theThunderstorm.Healsosuggestedthatmoreno.ofERSsetsshouldbemaintainedbyallthe
statesandcentralutilitiestoreducetheoutagetimeandsufferingofthepeople.
10.MOSPalsoadvisedDelhitodisseminateinformationtopublicabouttheoutagesandlikelytimeofinterruptionstoreducetheinconveniencetothepublic.