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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.