amendment – ii dated 01.06.2020 on the request for ... rajgarh 01062020.pdf · (sterlite) and...

Amendment–IIdated01.06.2020ontheRequestforProposalandTransmissionServiceAgreementissuedforselectionofbidderasTransmissionServiceProvidertoestablish“TransmissionSystemforevacuationofpowerfromREprojectsinRajgarh(2500MW)SEZinMadhyaPradesh”through

tariffbasedcompetitivebiddingprocess

Sl.No. ExistingProvisions

New/RevisedProvisions

SPECIFICTECHNICALREQUIREMENTSFORTRANSMISSIONLINE

1. 2.0a)SteelsectionofgradeE250and/orgradeE350asperIS2062,areonlypermittedforuseintowers,extensions,gantrystructuresandstub setting templates. For towers in snowbound areas, steelsectionsshallconformtoGrade-CofIS-2062.

2.0a)SteelsectionofgradeE250and/orgradeE350asperIS2062,onlyarepermitted for use in towers, extensions, gantry structures and stubsettingtemplates.Fortowersinsnowboundareas,steelsectionsshallconformtoGrade-CofIS-2062.

2. 6.0

Therelevantconductorconfigurationshallbeasfollows:-

i)TypeofHTLSconductor:INVAR/GAP/Compositecore/ACSSii)Basicparameters:TransmissionLine

AmpacityofHTLS

conductor(foranambient

temperatureof45°C)

MinimumConductordiameter(mm)

MaximumDC

Resistanceat20°C(Ω/km)

Sub-conductorSpacing(mm)

400kV(TwinHTLS)

transmissionline

1596A 28.62 0.05552 450mm

6.0

Therelevantconductorconfigurationshallbeasfollows:-i)Typeofconductor:HTLSii)Basicparameters:TransmissionLine

AmpacityofHTLSconductor(foranambienttemperatureof

45°C)

MinimumConductordiameter(mm)

MaximumDC

Resistanceat20°C(Ω/km)

Sub-conductor

Spacing(mm)

400kVTransmissionlinewithTwinHTLSconductor

1596A 28.62 0.05552 450



3. 8.0All electrical clearances including minimum live metal clearance,groundclearanceandminimummidspanseparationbetweenearthwire and conductor shall be as per Central Electricity Authority(Measures Relating to Safety & Electric Supply) Regulations asamendedfromtimetotimeandIS:5613.

8.0All electrical clearances including minimum live metal clearance,groundclearanceandminimummidspanseparationbetweenearthwire and conductor shall be as per Central Electricity Authority(Measures Relating to Safety & Electric Supply) Regulations asamendedfromtimetotimeandIS:5613.The minimum live metal clearances for 400 kV D/c transmissionlinesshallbeconsideredasfollows:

(i) UnderstationaryconditionsFromtowerbody:3.05m

(ii) UnderSwingconditionsWindPressureCondition

MinimumElectricalClearance

a)Swingangle(22º) 3.05mtrsb)Swingangle(44º) 1.86mtrs

4. 12.0Eachtowershallbeearthedsuchthattowerfootingimpedancedoesnotexceed 10 ohms. Pipe type or Counterpoise type earthing shall beprovided in accordance with relevant IS. Additional earthing shall beprovided on every 7 to 8 kms distance at tension tower for directearthingofbothshieldwires.

12.0Each tower shall be earthed such that tower footing impedancedoesnotexceed10ohms.PipetypeorCounterpoisetypeearthingshallbeprovidedin accordance with relevant IS. Additional earthing shall be provided onevery7to8kmsdistanceattensiontowerfordirectearthingofbothshieldwires.Ifsiteconditiondemands,multipleearthingoruseofearthingenhancementcompoundshallbeused.



5. NewPointtobeinserted 13.0Pilefoundationshallbeusedfortowerslocatedintheriverbed,oronriverbanksorinareaswhereriverfloworrivercourseisanticipatedtochangebasedonpreviousyears’hydrologydata.

6. NewPointtobeinserted 14.0Transmission line route shall be finalized, in consultation withappropriate authorities so as to avoid the habitant zones of GreatIndianBustardandotherprotectedspecies.Birddiverters,whereverrequired,shallbeprovidedontheline.

SPECIFICTECHNICALREQUIREMENTSFORSUBSTATION

7. GeneralThe proposed new substation shall be conventional AIS type generallyconfirming to the requirement ofCEA regulation for construction ofsubstation.

GeneralThe proposed new substation and proposed augmentation at Bhopal(Sterlite) and Shujalpur substations shall be conventional AIS typegenerallyconfirmingtotherequirementofCEA(TechnicalStandardsforConstructionofElectricalPlantsandElectricLines)Regulations2010,asamendedfromtimetotime.

8. 1.1InsulationCoordination

Thesystemdesignparametersforsubstations/switchyardsshallbeasgivenbelow:SlNo Descriptio

nofparameters

400/220kVRajgarhSEZPP

400kVBhopal(Sterlite)Extn.

400kVShujalpurS/SExtn.

400kVSystem

220kVSystem

400kVSystem

400kVSystem

1.1 InsulationCoordination

The system design parameters for substations/switchyards shall be asgivenbelow:SlNo Descriptio

nofparameters

400/220kVRajgarhSEZPP

400kVBhopal(Sterlite)Extn.


400kVSystem

220kVSystem

400kVSystem

400kVSystem



…….. 10. Max.fault

current63kA 50kA 50kA 40kA

……

…….. 10. Max.fault

current63kA 50kA 63kA 63kA

……

9. 1.2SwitchingScheme………………..i) At 400kV voltage level, each circuit of a double circuit transmissionlineshallbeterminatedindifferentdiameters.ii)TransformersofsameHVratingshallbeplacedindifferentdiameters.

1.2 SwitchingScheme

…………i) At400kVvoltagelevel,eachcircuitofadoublecircuittransmissionlineshallbeterminatedindifferentdiameters.ii) Transformers and Bus Reactor of same HV rating shall be placed indifferentdiameters.iii) At 220 kV switchyard, two numbers bus sectionalisers (onenumber for each bus) shall be used. One bus section shallaccommodate 4 ICT bays (present + future); 8 line bays (present +future); 1 bus reactor bay (present); 1 bus coupler bay (present); 1bustransferbay(present)whileotherbussectionshallaccommodate4 ICT bays (present + future); 7 line bays (present + future); 1 busreactor bay (future); 1 bus coupler bay (future); 1 bus transfer bay(future).

10. 2.0SubstationEquipmentandfacilities:…….Sl. Descriptionofbay 400/220kVRajgarh

SEZPP400kVBhopal(Sterlite)Extn.


400kV 220kV 400kV 400kV

2.0SubstationEquipmentandfacilities:……..Sl. Descriptionofbay 400/220kVRajgarhSEZ

PP400kVBhopal(Sterlite)Extn.


400kV 220kV 400kV 400kV



1. BusBar 4000A 4000A 4000A 3000A ……….. 5. BusCouplerBay - 4000A - - ….……..

7.Bus SectionalizerBay - 4000A - -

Further, current rating of all equipment in one diameter shall bethehighestcurrentratingrequiredforconnectedline/ICT/Reactorso that thesystemcouldoperatewithoutanyconstraint incaseofoutageofanybusbar.

1. BusBar 4000A 4000ASameasexisting

Sameasexisting

……….. 5. BusCouplerBay - 3150A - - ….……

7.Bus SectionalizerBay - 3150A - -

11. 2.1400/220kV,3-PhaseTransformerTransformer shall conform to IEC 60076 in general. The 500 MVAtransformers shall be designed based on design of dynamic shortcircuittested315MVAor500MVAtransformers.Thetransformerandallitsaccessoriesincludingbushing/builtinCTsetcshallbedesignedtowithstand thermal andmechanical stresses causedby symmetricalor asymmetrical faults on any terminals. Mechanical strength of thetransformer shall be such that it canwithstand3-phase and1-phasethrough fault for transformer ratedvoltageapplied toHVand/or IVterminals of transformer. The short circuit shall alternatively beconsidered to be applied to each of the HV, IV and tertiary (LV)transformer terminals. Tertiary isnot considered tobe connected tosource.Coreshallbeconstructed……………temperatureof50Deg.C.The transformer shall be complete with all required accessories,

2.1400/220kV,3-PhaseTransformerTransformer shall conform to IEC 60076 in general. The 500 MVAtransformers shall be designed based on design of dynamic short circuittested 315 MVA or 500 MVA transformers. The transformer and all itsaccessories including bushing/ built in CTs etc shall be designed towithstand thermal and mechanical stresses caused by symmetrical orasymmetrical faults on any terminals. Mechanical strength of thetransformer shall be such that it can withstand 3-phase and 1- phasethrough fault for transformer rated voltage applied to HV and / or IVterminals of transformer. The short circuit shall alternatively beconsideredtobeappliedtoeachoftheHV,IVandtertiary(LV)transformerterminals. Tertiary shall be considered not connected to source Themaximumshortcircuitoutputcurrentat the tertiary terminalsshallbelimited toasafevalue tomake the transformershortcircuitproof.TheTertiarywindingshallbedesignedtowithstandmechanicalandthermalstressesduetodeadshortcircuitonitsterminals.However,thecoolingforcontinuousthermalratingofthetertiarywindingshallbeforatleast



Bushing CTs, cooler control cabinet, individual and commonmarshalling box, RTCC etc as required for satisfactory operations oftransformer. The transformer shall be provided with IEC 61850compliantdigitalRTCCrelayhavingautomaticvoltageregulatingfeatures using Bay control and protection unit used for SAS, tooperateOLTCincludingparalleloperationoftransformers.

Neutralofthetransformershallbesolidlygrounded.

HV, IV and LV bushing shall be RIP (resin impregnated papercondenser)with composite insulator type. 36kVNeutralbushingshallbesolidporcelainoroilcommunicatingtype.Themajortechnicalparticulars/parametersoftransformeraregivenbelow:TechnicalParticulars/Parametersof500MVA,400/220/33kV,3-PhaseAutotransformerSl.No. Description Unit TechnicalParameters1. RatedCapacity:

HV/IV/LV(Tertiary)MVA 500/500/166.67

2. Voltageratio(Lineto

Line) 400/220/33

3. VectorGroup YNaOd114. Cooling ONAN/ONAF/(OFAFor

ODAF)orONAN/ONAF1/ONAF2

5. Ratingatdifferentcoolingabove

% 60/80/100

6. TypeofTransformer ConstantOhmic

5MVAcapacity.Coreshallbeconstructed……………temperatureof50Deg.C.Thetransformershallbecompletewithallrequiredaccessories,BushingCTs,coolercontrolcabinet,individualandcommonmarshallingbox, etcas required for satisfactory operations of transformer. Remote tapchangercontrolandmonitoringsystemincludingparalleloperationoftransformersshallbecarriedoutusingBaycontrolunitordigitalRTCCrelaythroughSubstationAutomationSystem.

Neutralofthetransformershallbesolidlygrounded.

HV,andIVbushingshallbeRIP(ResinImpregnatedPaper)/RIS(ResinImpregnatedSynthetic)withcompositeinsulatortype.LVbushingshallbe OIP/RIP/RIS. 36kV Neutral bushing shall be solid porcelain or oilcommunicatingtype.Themajortechnicalparticulars/parametersoftransformeraregivenbelow:TechnicalParticulars/Parametersof500MVA,400/220/33kV,3-PhaseAutotransformerSl.No. Description Unit TechnicalParameters1. RatedCapacity:

HV/IV/LV(Tertiary)MVA 500/500/166.67

(Tertiaryactiveloading:5MVA)

2. Voltageratio(LinetoLine)

400/220/33

3. VectorGroup YNaOd11



impedancetype7. Impedanceat75DegC a) HV–IV(withtolerance

asperIEC)% AtMax./Principal/Min.

VoltageTap:10.3/12.5/15.4

b) HV-LV % AtPrincipaltap(minimum):60

c) IV-LV % AtPrincipaltap(minimum):45

8. Losses a) MaximumNo-Load

Lossatratedvoltageandfrequency

kW 90

b) MaximumLoadLossatratedcurrentand

750C

kW 500

c) MaxI2Rlossatratedcurrentand

frequencyandat750CforHVandIVwindings

kW 375

d) MaximumAuxiliaryLossatratedvoltageandfrequency

kW 15

9. Max.Temperatureriseover50degCambientTemp

Deg.C Topoil:45&Winding:50

10. Windings iii) InsulationLevel

(LI/SI/PF) kVp/kVp/kVrms

4. Cooling ONAN/ONAF/(OFAForODAF)or

ONAN/ONAF1/ONAF25. Ratingatdifferent

coolingabove% 60/80/100

6. TypeofTransformer ConstantOhmicimpedancetype

7. Impedanceat75DegC a) HV–IV(withtolerance

asperIEC)% AtMax./Principal/Min.

VoltageTap:10.3/12.5/15.4

b) HV-LV % AtPrincipaltap(minimum):60

c) IV-LV % AtPrincipaltap(minimum):45

8. Losses a) MaximumNo-Load

Lossatratedvoltageandfrequency

kW 90

b) MaximumLoadLossatratedcurrentand

750C

kW 500

c) MaxI2Rlossatratedcurrentand

frequencyandat750CforHVandIVwindings

kW 375

d) MaximumAuxiliaryLossatratedvoltageandfrequency

kW 15



a) HV 1300/1050/570b) IV 950/-/395c) LV 250/-/95d) Neutral 95/-/38iv) Tandeltaofwinding % <0.5

11. TapChanger&Tappings

OLTCwithrange10%forHVvariationinthestepof1.25%,oncommonendofserieswinding

12. MaximumPartialdischarge(PD)levelat1.58*Ur/√3

pC 100

13. Noise level at ratedvoltage and atprincipaltapatnoloadandallcoolingactive

dB <80

14. Bushing i) Ratedvoltage

(HV/IV/LV/Neutral)kV 420/245/52/36

ii) Ratedcurrent(Min.)HV/IV/LV/Neutral

A 1250/2000/3150/2000

iii) InsulationLevel(LI/SI/PF)

kVp/kVp/kVrms

a) HV 1425/1050/695b) IV 1050/850/505c) LV 250/-/105d) Neutral 170/-/77iv) Tandeltaofbushings

HV/IV/LV% <0.5

v) Max.PDofbushingsat pC 10

9. Max.Temperatureriseover50degCambientTemp

Deg.C Topoil:45&Winding:50

10. Windings iii) InsulationLevel

(LI/SI/PF) kVp/kVp/kVrms

a) HV 1300/1050/570b) IV 950/-/395c) LV 250/-/95d) Neutral 95/-/38iv) Tandeltaofwinding % <0.5

11. TapChanger&Tappings

OLTCwith range±10%for HV variation in thestep of 1.25%, oncommon end of serieswinding

12. MaximumPartialdischarge(PD)levelat1.58*Ur/√3

pC 100

13. Noise level at ratedvoltage and atprincipaltapatnoloadandallcoolingactive

dB <80

14. Bushing i) Ratedvoltage

(HV/IV/LV/Neutral)kV 420/245/52/36

ii) Ratedcurrent(Min.)HV/IV/LV/Neutral

A 1250/2000/3150/2000

iii) InsulationLevel(LI/SI/PF)

kVp/kVp/kVrms



levelUm15. InsulatingOil virgin high grade

inhibited, conforming toIEC-60296

a) HV 1425/1050/695b) IV 1050/850/505c) LV 250/-/105d) Neutral 170/-/77iv) Tandeltaofbushings

HV/IV/LV% <0.5

v) Max.PDofbushingsatlevelUm

pC 10

15. InsulatingOil Unused inhibited oruninhibitedtransformer oil,conforming to IEC-60296-2012

12. 2.2420kV,3-Phase,ShuntReactorReactorshallconform……………….beyond1.5p.u.voltage.The reactor shall be of either gapped core type ormagneticallyshielded air core type (shell type) construction. The impedanceratio (X0/X1) specified shallbeachievedbyadoptingeither singlephaseconstructioninseparatetanksorthreephasewith3limbor5limb core construction. In case of coreless construction, amagneticshieldshallbeprovidedaroundthecorelesscoilsandnon-magnetic material sheet shall form the central core tominimize the vibrations. Core shall be constructed from non-ageing, cold rolled grain oriented silicon steel laminations withrequisiteBIScertification.

2.2420kV,3-Phase,ShuntReactorReactorshallconform……………….beyond1.5p.u.voltage.Thereactorshallbeofgappedcoretypeconstruction.Theimpedanceratio (X0/X1) specified shall be achieved by adopting either singlephaseconstructioninseparatetanksorthreephasewith3 limbor5limb core construction. Core shall be constructed from non-ageing,coldrolledgrainorientedsiliconsteel laminationswithrequisiteBIScertification.ShuntReactorsshall……………….temperatureas50DegC.



ShuntReactorsshall……………….temperatureas50DegC.The reactor shall be complete with all required accessories,Bushing CTs, marshalling box etc as required for satisfactoryoperationsofreactor.HVandNeutralbushingsshallbeRIP(resinimpregnatedpapercondenser)withcompositeinsulatortype.TheTechnicalParticulars/ParametersofShuntReactoraregivenbelow:Sl.No. Description Unit Parameters1. RatedVoltage,Ur(1p.u) kV 4202. RatedCapacityat420kV MV

AR125

3. CoolingSystem ONAN4. Permissiblecurrent

unbalanceamongdifferentphases

% ±2

5. CrestvalueofThirdHarmoniccontentinphasecurrentatratedvoltagewithsinusoidalwaveform

% ≤3%ofthecrestvalueoffundamental

6. RangeofconstantImpedance

Upto1.5p.u.voltage

7. Toleranceoncurrent % 0to+5%8. Ratioofzerosequence

reactancetopositivereactance(X0/X1)

Range

0.9-1.0

Thereactorshallbecompletewithallrequiredaccessories,BushingCTs, marshalling box etc as required for satisfactory operations ofreactor. HV and Neutral bushings shall be RIP (Resin ImpregnatedPaper)/ RIS (Resin Impregnated Synthetic) with compositeinsulatortype.The Technical Particulars / Parameters of 3-phase, 125MVAr, 420 kVShuntReactoraregivenbelow:S.No Description Unit TechnicalParameters1. RatedCapacityat

420kVMVAr 125

2. RatedVoltage(Ur)(1.0pu)

kV 420

3. Numberofphases 3(three)4. Connection Star5. Coolingtype ONAN6. Frequency Hz 507. Referencestandard IEC60076-68. Service Outdoor9. Permissible

unbalancecurrentamongphases

% ±2%

10. Crestvalueofthirdharmoniccontentinphasecurrentatratedvoltagewith

% ≤3%ofthecrestvalueoffundamental



9. Max.Temperatureriseover50degCAmbientTempatratedvoltage

Deg.C

Topoil:40&Winding:45

10. (a)MaximumPermissibleloadLossesatratedVoltage,Frequencyandat75°C(kW)for420kV,125MVAR,3-PhaseReactor

kW 160

(b)MaximumPermissibleI2RLossesfor420kV,125MVAR,3-PhaseReactoratratedVoltage,Frequencyandat75°C

kW 90

11. Windings a) Insulationlevel

(LI/SI/PF) kVp/

kVp/kVrms HV 1300/1050/- Neutral 550/-/230

b) Tandeltaofwindings % <0.512. Partialdischarge(PD)

levelat1.58Ur/√3

pC <100

13. Vibration&Tankstress ≤200micronspeak

sinusoidalwaveform11. Rangeofconstant

impedance Upto1.5p.uvoltage

(However, completesaturation characteristicsoftheReactorsupto2.5p.u.Voltageshallbefurnished)

12. Toleranceoncurrent % 0to+5%13. Ratio of zero

sequencereactancetopositive reactance(X0/X1)

Between0.9&1.0.

14. Temperatureriseover50°CAmbientTemp.at420kV

i) Topoilmeasuredbythermometer

°C 40

ii) Averagewindingmeasuredbyresistancemethod

°C 45

15. Windinghotspottemperatureriseoveryearlyweightedaveragetemperatureof32°C

°C 61

16. Max.tanksurfacetemperature

°C 110

17. Maxdesignambienttemperature

°C 50

18. Windings



levelatratedvoltageandfrequency

topeak;Average:≤60micronspeaktopeak.Stress:≤2.0kg/sq.mmatanypointontank.

14. Noiselevelatratedvoltageandfrequency

dB <80

15. Bushing a) Ratedvoltage:HV/

NeutralkV 420/145

b) Ratedcurrent(Min.)HV/Neutral

A 800/800

c) Insulationlevel(LI/SI/PF)

kVp/kVp/kVrms

HV 1425/1050/695

Neutral 650/-/305d) Tandeltaofbushings:

HV/Neutral% <0.5

e) PDofbushingsatlevelUm

pC <10

16. InsulatingOil virginhighgradeinhibited,conformingtoIEC-60296

i) LightningImpulsewithstandVoltage

Lineend kVp 1300 Neutral kVp 550ii) ChoppedWave

LightningImpulseWithstandVoltage

Lineend kVp 1430iii) Switching Impulse

withstand Voltage atLineend

kVp 1050

iv) OneMinutePowerFrequencywithstandVoltage

Neutral kVrms 23019. Tan-deltaofwindings <0.00520. Neutralearthing SolidlyEarthed21. Whetherneutral

broughtout Yes(through145kVclass

bushing)22. Bushing i) Ratedvoltage Linebushing kV 420 Neutralbushing kV 145ii) Ratedcurrent Linebushing A 800 Neutralbushing A 800iii) LightningImpulse

withstandVoltage



Linebushing kVp 1425 Neutralbushing kVp 650iv) SwitchingImpulse

withstandVoltageofLinebushing

kVp 1050

v) 1minutepowerfrequencywithstandofbushings(dry)

Linebushing kVrms 695 Neutralbushing kVrms 305vi) Minimumcreepage

distance (Specific Creepage

Distance: of 25mm/kVcorresponding to highestlinetolinevoltage)

Linebushing mm 10500

Neutralbushing mm 3625

vii) PartialdischargeofbushingsatUr(lineendandneutral)

pC <10

23. Maximumpartialdischargelevelat1.58Ur/√3

pC 100

24. Vibrationandtankstressatratedvoltage

Max≤200micronspeaktopeakAverage≤60micronspeaktopeakTankstress:≤2.0kg/sq.mmatanypointoftank



25. Maximumnoisepressurelevelatratedvoltage&frequency

dB 80

26. MaximumPermissible Lossesof Reactor at ratedcurrent andfrequency and at75°C

Totalloss

I2RLoss

i) 125MVAr420kV kW 160 90

27. Insulatingoil Unused inhibited oruninhibited transformeroil conforming to IEC-60296:2012

The neutral of shunt reactor shall be insulated to 550 kVp forlightning impulse. The neutral of the line reactors (whereverprovided) shall be grounded through adequately rated NeutralGrounding Reactors (NGR) to facilitate single phase auto-reclosure,provided that the NGR shall be provided with bypass arrangementthroughabreakersothatthelinereactorcanbeusedasBusreactoras and when required. The neutral of bus reactor shall be solidlygrounded.

13. 2.3CircuitBreakers(AIS)ThecircuitbreakersandaccessoriesshallconformtoIEC:62271-100, IEC:62271-1andshallbeofSF6Type.Theratedbreaktimeshallnot exceed40ms for400kVcircuit breakers and60ms for

2.3CircuitBreakers(AIS)The circuit breakers and accessories shall conform to IEC: 62271-100, IEC: 62271-1 and shall be of SF6 Type.The circuit breakersshall be of class C2-M2 (as per IEC) with regard to restrike



220kV circuit breakers. 400kV, 220kV Circuit breakers shall beprovided with single phase and three phase auto reclosing. TheCircuit breakers controlling 400kV lines of more than 200kmlength shall be provided with pre insertion closing resistor ofabout400ohmsmaximumwith8msminimuminsertion timeorControlledSwitchingDevice.Theshort line faultcapacityshallbesame as the rated capacity and this is proposed to be achievedwithoutuseofopening resistors.Thecontrolledswitchingdeviceshall be provided in 400kV Circuit breaker of switchable linereactor and in Main & Tie circuit breakers of line with non-switchablelinereactorsandBusreactors.

probability during capacitive current breaking and mechanicalendurance. Theratedbreak timeshallnotexceed40ms for400kVcircuitbreakersand60msfor220kVcircuitbreakers.400kV,220kVCircuitbreakersshallbeprovidedwithsinglephaseandthreephaseautoreclosing.TheCircuitbreakerscontrolling400kVlinesofmorethan 200km length shall be provided with pre insertion closingresistorofabout400ohmsmaximumwith8msminimuminsertiontime or Controlled Switching Device. The short line fault capacityshall be same as the rated capacity and this is proposed to beachievedwithoutuseofopeningresistors.Thecontrolledswitchingdeviceshallbeprovidedin400kVCircuitbreakerofswitchablelinereactorand inMain&Tiebay400kV circuitbreakersof linewithnon-switchablelinereactorsandBusreactors.

14. 2.4Isolators(AIS)TheisolatorsshallcomplytoIEC62271-102ingeneral.400kVand220kV Isolatorsshallbedoublebreak type.All Isolatorsandearthswitchesshallbemotoroperated.Earthswitchesshallbeprovidedat various locations to facilitate maintenance. Isolator rated for400kVand220kVshallbeofextendedmechanicalenduranceclass-M2 and all earth switches shall be classM0 as per IEC-62271-102.Mainbladesandearthbladesshallbeinterlockedandinterlockshall be fail safe type. 400kV and 220kV earth switch for lineisolator shall be suitable for induced current switching duty asdefinedforClass-B.

2.4Isolators(AIS)The isolators shall comply to IEC 62271-102 in general. 400 kV and220kV Isolators shall be double break type. All Isolators and earthswitchesshallbemotoroperated.Earthswitchesshallbeprovidedatvarious locations to facilitate maintenance. Isolator rated for 400kVand220kVshallbeofextendedmechanicalenduranceclass-M2andsuitable for bus transfer current switching duty as per IEC-62271-102.Mainbladesandearthbladesshallbe interlockedand interlockshallbefailsafetype.400kVand220kVearthswitchforlineisolatorshall be suitable for induced current switching duty as defined forClass-B.

15. 2.5CurrentTransformers(AIS)CurrentTransformersshallcomplywithIEC61869-1&61869-2in

2.5CurrentTransformers(AIS)Current Transformers shall complywith IEC 61869-1&61869- 2 in



general. All ratios shall be obtained by secondary taps. Generally,CurrentTransformers(CT)for400kVshallhavesixcores(fourforprotectionandtwoformetering).220kVCurrentTransformersshallhave five cores (four for protection and one for metering). Theburden and knee point voltage shall be in accordance with therequirementsof the system includingpossible feeds for telemetry.AccuracyclassforprotectioncoreshallbePXandformeteringcoreit shall be 0.2S. The rated burden of cores shall be closer to themaximumburdenrequirementofmetering&protectionsystemforbettersensitivityandaccuracy.

general. All ratios shall be obtained by secondary taps. Generally,Current Transformers (CT) for 400kV shall have six cores (four forprotectionand two formetering). 220kVCurrentTransformersshallhavefivecores(fourforprotectionandoneformetering).Theburdenandkneepointvoltageshallbe inaccordancewith therequirementsofthesystemincludingpossiblefeedsfortelemetry.AccuracyclassforprotectioncoreshallbePXandformeteringcoreitshallbe0.2S.Therated burden of cores shall be closer to the maximum burdenrequirement ofmetering& protection system (notmore than 20VAformeteringcore)forbettersensitivityandaccuracy.TheInstrumentsecurityfactorshallbelessthan5.

16. 2.6CapacitorVoltageTransformer(AIS)Capacitive Voltage transformers shall comply to IEC 61869-1 &61869-5ingeneral.Theseshallhavethreesecondariesoutofwhichtwo shall be used for protection and one for metering. Accuracyclassforprotectioncoresshallbe3Pandformeteringcoreshallbe0.2. The Capacitive voltage transformers on lines shall be suitableforCarrierCoupling.TheCapacitanceofCVTfor400kVand220kVshall be of 4400/8800 pF depending on PLCC requirements. Therated burden of cores shall be closer to the maximum burdenrequirementofmetering&protectionsystemforbettersensitivityandaccuracy.

2.3CapacitorVoltageTransformer(AIS)Capacitive Voltage transformers shall comply to IEC 61869-1 &61869-5 in general.These shall have three secondariesoutofwhichtwoshallbeusedforprotectionandoneformetering.Accuracyclassforprotectioncoresshallbe3Pandformeteringcoreshallbe0.2.TheCapacitive voltage transformerson lines shall be suitable forCarrierCoupling. The Capacitance of CVT for 400kV and 220kV shall be of4400/8800pFdependingonPLCCrequirements.Theratedburdenofcoresshallbeclosertothemaximumburdenrequirementofmetering& protection system for (not more than 50VA for metering core)bettersensitivityandaccuracy.



17. 2.7SurgeArresters(AIS)336kV&216kVStationclass,currentlimiting,heavydutygaplesstypeSurgearrestersconformingtoIEC60099-4ingeneralshallbeprovided for 420kV & 245kV systems respectively. The ratedvoltage of Surge arrester and other characteristics are chosen inaccordance with system requirements. Surge arresters shall beprovided near line entrances, transformers & Reactor so as toachieve proper insulation coordination. Surge Arresters shall beprovided with porcelain/ polymer housing fitted with pressurereliefdevices.Aleakagecurrentmonitorwithsurgecountershallbeprovidedwitheachsurgearrester.

2.7SurgeArresters(AIS)336kV&216kVStationclass,heavydutygaplesstypeSurgearrestersconformingto IEC60099-4 ingeneralshallbeprovided for420kV&245kV systems respectively.The ratedvoltage of Surgearresterandother characteristics are chosen in accordance with systemrequirements. Surge arresters shall be provided near line entrances,transformers & Reactor so as to achieve proper insulationcoordination. Surge Arresters shall be provided with porcelain/polymerhousingfittedwithpressurereliefdevices.Aleakagecurrentmonitorwithsurgecountershallbeprovidedwitheachsurgearrester.

18. 2.8ProtectionRelaying&ControlSystem

The protective relaying system proposed to be provided fortransmission lines, auto- transformers, reactors and bus bars tominimize thedamage to theequipment in theeventsof faults andabnormal conditions, is dealt in this section. All main protectiverelays shall be numerical type with IEC 61850 communicationinterface. All numerical relays shall have built in disturbancerecordingfeature.

2.8ProtectionRelaying&ControlSystemThe protective relaying system proposed to be provided fortransmission lines, auto- transformers, reactors and bus bars tominimize the damage to the equipment in the events of faults andabnormalconditions,isdealtinthissection.Allmainprotectiverelaysshallbenumerical typewith IEC61850communication interface.Allnumericalrelaysshallhavebuiltindisturbancerecordingfeature.Theprotection circuits and relaysof transformerand reactor shallbeelectricallyandphysicallysegregatedintotwogroupseachbeingindependent and capable of providing uninterrupted protectioneven in the event of one of the protection groups failing, to obtainredundancy, and to take protection systems out for maintenancewhiletheequipmentremainsinservice.

19. 2.8a)TransmissionLinesProtection

2.8a)TransmissionLinesProtection



400kV and 220kV lines shall have Main-I numerical three zonedistance protection scheme with carrier aided inter-trippingfeature. 400kV and 220kV lines shall also haveMain-II numericaldistanceprotectionschemelikeMain-IbutfromdifferentmakethatofMain-I. TheMain-I andMain-II protection relays of samemakemay be provided only if they are of different hardware &manufacturingplatform.Line Current Differential relay (with back up distance protectionfeature)asMain–IandMain-IIshallbeconsideredatbothendsforshort lines (line length below 30kM) having Fibre Opticcommunication link. Differential relay at remote end shall beprovided by the TSP. Associated power & control cabling andintegrationwithSASatremoteendshallbeprovidedbyrespectivebayowner.………………

400kV and 220kV lines shall have Main-I numerical three zonedistanceprotection schemewith carrier aided inter-tripping feature.400kV and 220kV lines shall also have Main-II numerical distanceprotectionschemelikeMain-IbutfromdifferentmakethatofMain-I.The Main-I and Main-II protection relays of same make may beprovided only if they are of different hardware, manufacturingplatformordifferentprincipleofoperation.However, Line Current Differential relay (with back up distanceprotectionfeature)asMain–IandMain-IIshallbeconsideredatbothends for short lines (line length below 30kM) having Fibre Opticcommunicationlink.Differentialrelayatremoteendshallbeprovidedby theTSP.Associatedpower&control cablingand integrationwithSASatremoteendshallbeprovidedbyrespectivebayowner.…………..

20. 2.8b)AutoTransformerProtection…………Suitablemonitoring,control(operationofassociatedcircuitbreaker&isolator)andprotectionforLTauxiliarytransformerconnectedtotertiary winding of auto-transformer for the purpose of auxiliarysupply shall be provided. The Over current and open deltaprotection is required to be provided for the auxiliarytransformer.Theseprotectionandcontrolmaybeprovidedasbuiltin feature either in the bay controller to be provided for theauxiliarysystemorinthecontrol&protectionIEDstobeprovidedforautotransformer.

2.8b)AutoTransformerProtection………….Suitablemonitoring,control(operationofassociatedcircuitbreaker&isolator) and protection for LT auxiliary transformer connected totertiary winding of auto-transformer for the purpose of auxiliarysupply shall be provided. The Over current and other necessaryprotection shall be provided for the auxiliary transformer. Theseprotectionandcontrolmaybeprovidedasbuiltinfeatureeitherinthebaycontrollertobeprovidedfortheauxiliarysystemorinthecontrol&protectionIEDstobeprovidedforautotransformer.

21. 2.9a)SubstationAutomationSystem

2.9a)SubstationAutomationSystem



a)………….Thefunctionsofcontrol,annunciation,disturbancerecording,eventlogging and measurement of electrical parameters shall beintegratedinSubstationAutomationSystem.The Automation System shall be provided with the facility ofcommunication and control for remote end operation so that byproviding remote HMI and suitable communication link, thesubstation can be controlled from a remote location. Mode ofcommunicationshallbeconsideredasopticalfibreorleasedlinebasedonIEC-60870-5-104communicationprotocol.Atnew substations, the SubstationAutomation System (SAS) shallbesuitableforoperationandmonitoringofthecompletesubstationincludingproposedfuturebays/elements.………

a)…………The functions of control, annunciation, disturbance recording, eventlogging andmeasurement of electrical parameters shall be integrated inSubstationAutomationSystem.At new substations, the Substation Automation System (SAS) shall besuitableforoperationandmonitoringofthecompletesubstationincludingproposedfuturebays/elements.………

22. 3.1i)………..Additionally,ActiveEnergyMetersmaybeprovidedatthesamepointinthe33kVtertiaryofTransformerbylocalSEB/DISCOMforenergy.

3.1i)…………Additionally,ActiveEnergyMetersmaybeprovidedat the samepoint inthe 33kV tertiary of Transformer by local SEB/DISCOM for energyaccounting.



23. 3.1iii)SuitableAC&DCdistributionboardsandassociatedLTSwitchgearshallbeprovidedatnewsubstation.Fornewsubstation,followingswitch boards with minimum rating as specified here undershallbeconsideredwithduplicatesupply:(a) 415VMainSwitchboard–2nos.(twosectionsseparatedby

onebuscoupler)(b) ACdistributionboard–2nos.(twosectionsseparatedbyone

buscoupler)(c) Mainlightingdistributionboard–1no.(d) Emergencylightingdistributionboard–1no.(e) 220VoltDCdistributionboard–2nos.(f) 48VoltDCdistributionboard–2nos.Sizing of LT Switchgear shall be suitable to cater therequirement for all present and future bays. AC & DCdistribution boards shall have modules for all the feeders(includingfutureasspecified).

3.1 iii)

Suitable AC & DC distribution boards and associated LT Switchgearshallbeprovidedatnewsubstation.SizingofLTSwitchgearshallbesuitabletocatertherequirementforallpresentandfuturebays.AC&DCdistributionboardsshallhavemodulesforallthepresentandfuturefeedersasspecified.

Fornewsubstation,followingswitchboardsshallbeconsideredwithduplicate supply with bus coupler/ sectionalizer and duplicateoutgoing feeders except for Emergency lighting distribution boardwhichshallhaveonlyoneincomingfeeder:(a) 415VMainSwitchboard–1no.(b) ACdistributionboard–1no.(c) Mainlightingdistributionboard–1no.(d) Emergencylightingdistributionboard–1no.(e) 220VoltDCdistributionboard–2nos.(f) 48VoltDCdistributionboard–2nos.

24. 3.7Visualmonitoringsystemforwatchandwardofsubstationpremises:Visual monitoring system for effective watch and ward ofsubstation premises covering the areas of entire switchyard,Control room building, other buildings/stores andmain gate,shall be provided. The Visual Monitoring System shall haveprovisionofWANconnectivityforremotemonitoring.

Thenumberofcamerasandtheirlocationsshallbedecidedinsuchawaythatanylocationcoveredinthesubstationareacan

3.7 Visual monitoring system (VMS) for watch and ward of substationpremises:Visualmonitoringsystemforeffectivewatchandwardofsubstationpremisesshallcoverallthetransformersandreactors,allothermajorAISEquipment (suchasCB, isolators,CT,CVT,SAetc.asapplicable),panelroom,allthegatesofswitchyardandallentryandexitpointsofcontrol roombuilding andaccordingly the locationof cameras shallbedecided.ThecamerashallbehighdefinitioncolorCCDcamerawithnight vision feature. The VMS data partly/completely shall berecorded (minimum for 15 days) at least @25fps (or better) and



be scanned. The cameras shall be located in such a way tomonitoratleast:

1. Theoperationofeachandeveryisolatorpoleofthe

completeyardincaseofAISSub-station.2. The Operation of each bay bays of GIS Hall as

applicable.3. AlltheTransformerandReactors,alltheEntrance

doorsofControlRoomBuilding,GIShallandanyotherbuildingasapplicable.

4. Allthegatesofswitchyard.5. MainentranceGate6. AllothermajorAISEquipment(suchasCB,CT,CVT,SA

etc.asapplicable)

At existing substations, the visual monitoring system asavailableshallbeaugmentedasrequired.

storedonnetworkvideorecorder.Thesystemshallusevideosignalsfrom various cameras installed at different locations, process themfor viewing on workstations/monitors in the control room andsimultaneously record all the cameras.Mouse/keyboard controllersshall be used for pan, tilt, zoom and other functions of the desiredcamera. The VisualMonitoring System shall have provision ofWANconnectivityforremotemonitoring.

All camera recordings shall have Camera ID & location/area ofrecording as well as date/time stamp. The equipment shouldgenerally conform to Electromagnetic compatibility requirement foroutdoorequipmentinEHVsubstation.Atexistingsubstations,thevisualmonitoringsystemifavailableshallbeaugmentedasperexistingorbetterspecificationasrequired.

25. 4.0e)GeneralFacilitiesIn 400kV switchyard, if spare bay of half diameter is identified asfuture, all the equipment for Tie & Future bay shall be designedconsideringthecurrentratingoflinebayi.e.3000A.

4.0e)GeneralFacilitiesIn 400kV switchyard, if spare bay of half diameter is identified asfuture, all the equipment for Tie & Future bay shall be designedconsideringthecurrentratingoflinebayi.e.3150A.

26. AttheendPLCC

PLCC & PBAX: Power line carrier communication (PLCC)

Deleted.



equipmentcompleteforspeech,teleprotectioncommandsanddatachannelsshallbeprovidedoneachtransmissionline.Theprotections for transmission line and the line compensatingequipmentshallhavehundredpercentbackupcommunicationchannelsi.e.twochannelsfortele-protectioninadditiontoonechannel for speech plus data for each direction. The PLCCequipmentshallinbriefincludethefollowing:-

Coupling device, line traps, carrier terminals, protectioncouplers,HFcables,PABX(ifapplicable)andmaintenanceandtestinginstruments.

A telephoneexchange (PABX)of 24 lines shall beprovidedatnew substations as means of effective communication amongvariousbuildingsofthesubstation,remoteendsubstationsandwithcontrolcenters(RLDC/SLDC)etc.Couplingdevicesshallbesuitable forphasetophasecouplingfor 400kV Transmission lines. The pass band of couplingdevicesshallhavesufficientmarginforaddingcommunicationchannelinfutureifrequired.Necessaryprotectiondevicesforsafety of personnel and low voltage part against powerfrequency voltages and transient over voltage shall also beprovided.Thelinetrapsshallbebroadbandtunedsuitableforblockingthecompleterangeofcarrierfrequencies.LineTrapshallhavenecessaryprotectivedevicessuchaslightningarrestersfortheprotection of tuningdevice.Decouplingnetwork consisting of



line traps and coupling capacitors may also be required atcertainsubstationincaseofextremefrequencycongestion.

The carrier terminals shall be of single side-band (SSB)amplitude modulation (AM) type and shall have 4 kHz bandwidth.PLCCCarrierterminalsandProtectioncouplersshallbeconsideredforbothendsoftheline.

PLCC equipment for all the transmission lines covered underthescheme(consistingofonesetofanalogPLCCchannelalongwithcircuitprotectioncouplerandonesetofDigitalprotectioncoupler for both ends) shall be provided by TSP. Further,PLCC equipment for both ends of transmission lines notcoveredunderpresentscopeshallbeprovidedbydeveloperoflines. However, CVT &Wave trap for all the line bays underpresentscopeshallbeprovidedbyTSP.

TSP shall provide/undertake necessaryaddition/modification/shifting/re-commissioning etc. of PLCCequipment due to LILO of transmission lines (whereverapplicable).Allotherassociatedequipmentlikecabling,couplingdeviceandHFcableshallalsobeprovidedbytheTSP.ThewavetrapandCVTrequiredforPLCCatremoteendshallbeprovidedbyrespectivebayowner.

SPECIFICTECHNICALREQUIREMENTSOfCOMMUNICATIONSYSTEM

27. Inordertomeettherequirementforgridmanagementandoperationof In order tomeet the requirement for gridmanagement and operation of



substations, Transmission Service Provider (TSP) shall conform to thefollowingrequirements.Transmission system for evacuationof power fromREprojects inRajgarh(2500MW)SEZinMadhyaPradeshRajgarh SEZ PP -Bhopal (Sterlite) 400kV D/c line (HTLS) (withminimumcapacityof2100MVA/cktatnominalvoltage)OnRajgarhSEZPP-Bhopal(Sterlite)400kVD/cline(HTLS)oneOPGWcontaining24FibresistobeinstalledbytheTSPinplaceofconventionalearthwireduringtheconstructionofline.TheinstallationofOPGWshallbedonefromgantryofRajgarhSEZPPuptogantryofBhopal(Sterlite)400kVandshallbe terminated ina JointBox tobeprovidedbyTSPatboth the ends. In case of requirement of repeater to establish linkbetweenRajgarhSEZPP-Bhopal(Sterlite),theOPGW(48F)connectivityfrompowerlinecrossingpointuptorepeaterstationshallalsobeinthescopeofTSP.RajgarhSEZPP–Shujalpur400kVD/cline(HTLS)(withminimumcapacityof2100MVA/cktatnominalvoltage)

substations, Transmission Service Provider (TSP) shall conform to thefollowingrequirements.Rajgarh SEZ PP -Bhopal (Sterlite) 400kV D/c line (HTLS) (withminimumcapacityof2100MVA/cktatnominalvoltage)OPGW:On Rajgarh SEZ PP - Bhopal (Sterlite) 400kV D/c line (HTLS) underpresentscopeoneOPGWcontaining24FibresistobeinstalledbytheTSPin place of conventional earth wire during the construction of line. Theinstallation of OPGW shall be done from gantry of Rajgarh SEZ PP up togantryofBhopal(Sterlite)400kVandshallbeterminatedinaJointBoxtobeprovidedbyTSPatboththeends.IncaseofrequirementofrepeatertoestablishlinkbetweenRajgarhSEZPP-Bhopal(Sterlite),theOPGW(48F)connectivityfrompowerlinecrossingpointuptorepeaterstationshallalsobeinthescopeofTSP.The protection system for 400kV and higher voltage transmissionline and the line compensating equipment shall have one hundredpercentbackupcommunicationchannels i.e. twochannelsfortele-protection inaddition toonechannel for speechplusdata foreachdirection.Rajgarh SEZPP – Shujalpur 400 kVD/c line (HTLS) (withminimum



On Rajgarh SEZ PP - Shujalpur (Sterlite) 400kV D/c line (HTLS) oneOPGW containing 24 Fibres is to be installed by the TSP in place ofconventionalearthwireduringtheconstructionofline.TheinstallationofOPGW shall be done from gantry of Rajgarh SEZ PP up to gantry ofShujalpur400kVandshallbeterminatedinaJointBoxtobeprovidedbyTSPatboththeends.IncaseofrequirementofrepeatertoestablishlinkbetweenRajgarhSEZPP-Shujalpur,theOPGW(48F)connectivityfrompowerlinecrossingpointuptorepeaterstationshallalsobeinthescopeofTSP.Establishment of 400/220kV, 5X500MVAatRajgarh SEZPPwith420kV(125MVAR)busreactor…………….

capacityof2100MVA/cktatnominalvoltage)OPGW:On Rajgarh SEZ PP - Shujalpur (Sterlite) 400kV D/c line (HTLS) underpresentscopeoneOPGWcontaining24FibresistobeinstalledbytheTSPin place of conventional earth wire during the construction of line. Theinstallation of OPGW shall be done from gantry of Rajgarh SEZ PP up togantry of Shujalpur 400kV and shall be terminated in a Joint Box to beprovided by TSP at both the ends. In case of requirement of repeater toestablish link between Rajgarh SEZ PP - Shujalpur, the OPGW (48F)connectivityfrompowerlinecrossingpointuptorepeaterstationshallalsobeinthescopeofTSP.Theprotectionsystemfor400kVandhighervoltagetransmissionlineandthelinecompensatingequipmentshallhaveonehundredpercentbackupcommunicationchannelsi.e.twochannelsfortele-protectioninadditiontoonechannelforspeechplusdataforeachdirection.Establishment of 400/220 kV, 5X500 MVA at Rajgarh SEZ PP with420kV(125MVAR)busreactor………………………

28. NewPointtobeinserted PLCC&PBAX:Power line carrier communication (PLCC) equipment complete forspeech, tele-protection commands and data channels shall beprovidedoneachtransmissionline.Theprotectionsfortransmissionlineandthelinecompensatingequipmentshallhavehundredpercent


New/RevisedProvisionsbackupcommunicationchannelsi.e.twochannelsfortele-protectioninadditiontoonechannelforspeechplusdataforeachdirection..ThePLCCequipmentshallinbriefincludethefollowing:-

• Coupling device, line traps, carrier terminals, protectioncouplers,HFcables,PABX(ifapplicable)andmaintenanceandtestinginstruments.

• At new substation, a telephone exchange (PABX) of 24 lines

shall be provided at as means of effective communicationamong various buildings of the substation, remote endsubstationsandwithcontrolcentres(RLDC/SLDC)etc.

• Couplingdevicesshallbesuitableforphasetophasecouplingfor 765kV & 400kV Transmission lines. The pass band ofcoupling devices shall have sufficient margin for addingcommunication channel in future if required. Necessaryprotectiondevicesforsafetyofpersonnelandlowvoltagepartagainst power frequency voltages and transient over voltageshallalsobeprovided.

• Thelinetrapsshallbebroadbandtunedsuitableforblocking

thecompleterangeofcarrierfrequencies.LineTrapshallhavenecessaryprotectivedevicessuchaslightningarrestersfortheprotectionof tuningdevice.Decouplingnetworkconsistingofline traps and coupling capacitors may also be required atcertainsubstationincaseofextremefrequencycongestion.

• The carrier terminals shall be of single side-band (SSB)



amplitudemodulation (AM) type and shall have 4 kHz bandwidth.PLCCCarrierterminalsandProtectioncouplersshallbeconsideredforbothendsoftheline.

• PLCC equipment for all the transmission lines coveredunderthescheme(consistingofonesetofanalogPLCCchannelalongwith circuit protection coupler and one set of Digitalprotection coupler for both ends) shall be provided by TSP.CVT&Wavetrapforalllinebays,underpresentscopeshallbeprovidedbyTSP.

• TSP shall provide/undertake necessary

addition/modification/shifting/re-commissioning etc. of PLCCequipment due to LILO of transmission lines (whereverapplicable).

• All other associated equipment like cabling, coupling device

andHFcableshallalsobeprovidedbytheTSP.

amendment – ii dated 01.06.2020 on the request for ... rajgarh 01062020.pdf · (sterlite) and...

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