Battery Charger Sizing SS 1,Rev 03

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DOCUMENT NO.

SL.No.

1 BASIS & ASSUMPTIONS 1

WORKSHEET No.DESCRIPTION

TABLE OF CONTENT

DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2

EL00211 REV.- 03

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REFERENCE DOCUMENT NO.

1.Overall Electrical Single Line Diagram For SS-1(DHC Tail End) (Drawing No.EL00001,Rev.-F )2.Technical Specification of Battery ,Battery Charger & DC Distribution Board Volume - IVof V Page-55 of 272 Section 2.3

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2 REFERENCE CATALOGUE 2

3 3

4 4

5 5

6 6

7 7

DC LOAD CALCULATION

BATTERY LOAD CYCLE DIAGRAM

BATTERY AMP-HOUR SIZING

BATTERY CHARGER SIZING

CALCULATION FOR QUANTITY OF CELLS

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1.0 PURPOSE

a)

b)

c)d)

2.0 DESIGNBASIS&ASSUMPTIONS2 1

Todeterminethenumberofcellsfor110VDCBattery.

WORKSHEET1BASIS&ASSUMPTIONS

TodeterminetheAmpereHourratingof110VDCBattery.TodeterminetheratingofBatteryCharger.

The sizing of Battery has been done on the basis of IEEE 485 :1997

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REFERENCE DOCUMENTNO.

1.Overall Electrical Single Line Diagram For SS-1(DHC Tail End) (Drawing No.EL00001, Rev.-F )2.Technical Specification of Battery ,Battery Charger & DC Distribution Board Volume - IV of V Page-55 of 272 Section 2.3

ThepurposeofthiscalculationisToestablishbatteryloadcyclefor110VDCBattery.

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10 Battery is designed to be operated at a temprature range of 19 deg C to 33 deg C.However, design operating temprature hasbeenconsideredas27degC.

(EndCellVoltage(ECV)istakenas1.85VasperDesignCriteriaofTechnicalSpecificationVolumeIVofV,Clause2.3.2,Pg56of272)

(Reference:SincenothinghasbeenspecifiedinTechnicalSpecification,wehaveassumed1hourbackupdurationforLoaddutyCycle).

110VDCBatteryBankshallbecomprisedofabankof2.0VratedLeadacidplantetypebattery.(Reference: Technical Specification of Battery ,Battery Charger & DC Distribution Board Volume IV of V Page55 of 272 Section

Batteryissizedforabackupdurationof10hourforLoadDutyCycle.

DCOutputVoltageshallbeadjustablebetween+10%&10%ofNominalratedvoltage.

TheEndCellVoltageofeachBatteryCellis1.85Volts.

110 V Lead acid plante type Battery Bank and Float cum Boost Charger has been considered for catering Control, Protection &IndicationLoadof6.6KVSwitchboardofSS1,ACBsofPMCCPanel&othermiscllenousloads.

(Reference:TechnicalSpecificationofDCSystem,VolumeIVofV,Clause2.3.3.1.2,Page59of272).

(Reference:asperIEEE485:1997,Clause6.2.2)

(Reference:TechnicalSpecificationofDCSystem,VolumeIVofV,Clause2.3.3.2.5,ii,Page61of272).

AnAgeingFactorof1.25hasbeenconsidered.

A nominal Design Margin of 10% has been considered for standard over sizing of battery to allow for unforseen operatingconditions of the battery due to improper maintenance, recent discharge or ambient temperature lower than the anticipatedorboth.

ThesizingofBatteryhasbeendoneonthebasisofIEEE 485:1997ThesizingofBatteryChargerhasbeendoneonthebasisofIEEE946:1995.

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2.11

2.12

2.12

2.13

Float Charge Voltage is 2.25 Volts per Cell .( As per Manufacturer's Catalogue ) we have consider one of the mfg. details forcalculatuion,afterfinalisationwewillrevsieditsubmitagain

Value of Capacity factor (KT) at 1min & 600min has been obtained from Manufacturer's Catalogue as attached herewith in"Reference Catalogue" worksheet. Further, the value of Capacity Factor (KT) at 588min & 599min are derived from the abovetwoterminalvaluesbythemethodofextrapolation.

TemperatureCorrectionFactorhasbeentakenas1.25at8degCasperIEEE485:1997

Boost Charge Voltage 2.60 Volts per Cell. ( As per Manufacturer's Catalogue ) we have consider one of the mfg. details for

2.14

2.15

2.16

2.17a)

b)

c)

DCloadsona/cofcontrol,indication,annunciationandprotectiondeviceshavebeenconsideredforEntire0to600minutedutycycleasperstandardengineeringandsystemrequirement.1)Allprotectionrelay,Aux.Relay,IndicatingLamps,Annunciator,hooterAux.Contactor

FollowingDCloadsareconsideredatLast599to600minutedutycycle:1)ClosingCoilof6.6KVHTBoardIncomer1No.2)ClosingCoilof6.6KVHTBoardTransformerOutgoingVCB5No.(Includingspare)3)ClosingCoilof6.6KVHTBoardCapacitorOutgoing1No.

ThisDCSystemwillfeedpowertofollowingloads:a)Control,ProtectionandIndicationcircuitof6.6KVHTPanel,b)TrippingCoilofincomer&buscouplerACBsofPMCCPanelThevariousloadsforthebatterydutycycleisconsiderasunderThefollowingdutycycleisconsidereda)ThebatteryfeedsthecontinuousloadsofIndicatinglamps,Relays,Contactmultiplicationequipment,etc.b)Allthebreakersaretrippedc)Attheendofthedutycycle,toresumepowertothebatterycharger,MVbreakersareconsideredtobeclosedLoadCycleScenarioFollowingDCloadsareconsideredForFirst0to1minuteofLoadDutyCycleasperstandardengineeringandsystemrequirement.1)TrippingCoilof6.6KVHTBoardIncomerVCB1No.2)TrippingCoilof6.6KVHTBoardTransformerOutgoingVCB5No.(Includingspare)3)Trippingcoilof6.6KVHTBoardCapacitorOutgoingVCB1No.4)TrippingCoilofPMCCincomerACB&BuscouplerACB5)MasterTripRelayforallincoming&outgoingfeeder.

While sizing of Battery Charger, it has been considered that battery shall have maximum recharge time of 10 hours asdescribedherewithin"ReferenceCatalogue"worksheet.

calculatuion,afterfinalisationwewillrevsieditsubmitagain.

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1.0

EndCellVoltage(ECV)istakenas1.85VasperDesignCriteriaofTechnicalSpecificationVolumeIVofV,Clause2.3.2,Pg56of272

2.0 TEMPRATURECORRECTIONFACTOROFBATTERYASPERIEEE485

ENDCELLVOLTAGE(ECV)

0


EL00211 REV.- 03


1.Overall Electrical Single Line Diagram For SS-1(DHC Tail End) (Drawing No.EL00001, Rev.-F )2.Technical Specification of Battery ,Battery Charger & DC Distribution Board Volume - IV of V Page-55 of272 S ti 2 3

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Worksheet2

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Worksheet23.0

Time(Minute)

ECV1(1.75V)

ECV2(1.85V)

ECV3(1.80V)

01 0.75 1.18 0.94

598 9 80

FromaboveCapacityFactorChartofchabbi,CapacityFactorsat27degCarederivedasbelow:

CAPACITYFACTOR(KT)

598 9.80

599 9.90

600 10

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Worksheet24.0 FLOATCHARGEVOLTAGE(FCV)&BOOSTCHARGEVOLTAGE(BCV)

AsperManufacturer'sCatalogue

6.0 BATTERYRECHARGETIMEFloatchargeVoltageat27degC 2.25 Volts/CellBoostchargeVoltageat27degC 2.60 Volts/Cell

6.0 BATTERYRECHARGETIMEAsperManufacturer'sCatalogue,BatteryRechargetimehasbeenconsideredas10hours.

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Feeder LoadDescription Quantity ContinousLoad TotalContinousLoad TrippingLoad ClosingLoad0~600min 0~600Min 0~1min(FirstMinute) 599~600min(LastMinute)

TrippingCoil 1 0 0 200 0ClosingCoil 1 0 0 0 200Springchargingformotor 1 0 0 0 200Aux.Contactor 1 10 10 0 0BreakerContactmultiplicationRelay52X 1 3 3 0 0Antipumpingrelay94(PLA) 1 6 6 0 0MasterTripRelay86(VAJHM23) 1 5 0 5 0TripCktSupervisionRelay95(VAX31) 1 3 3 0 0AC&DCFailRelay80 2 4 8 0 0MicomP127Relay 1 4 4 0 0AuxiliaryRelay(VAA11) 3 9 27 0 0DigitalMultiFunctionMeter 1 4 4 0 0Annunciator(8Window) 1 12 12 0 0

6.6KVIncomer(VCB)

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DCLOADCALCULATION(inWATT)SUBSTATION

6.6KVHTPANEL


Worksheet3


Hooter 1 15 15 0 0

AuxContactor 1 10 10 0 0IndicationLamps 14 2 28 0 0TimerR1/R2 2 3 6 0 0

TrippingCoil 5 0 0 1000 0ClosingCoil 5 0 0 0 1000Springchargingformotor 5 0 0 0 200Antipumpingrelay94(PLA) 5 6 30 0 0SensitiveEarthFaultRelay50G(CTUM15) 5 2 10 0 0BuchorzRelayAlarmRelay 5 3 17 0 0MasterTripRelay86(VAJHM23) 5 5 0 5 0TripCktSupervisionRelay95(VAX31) 5 3 15 0 0MicomP127Relay 5 4 20 0 0AuxiliaryRelay(VAA33) 15 9 135 0 0DigitalMultiFunctionMeter 5 4 20 0 0Annunciator(8Window) 5 12 60 0 0Hooter 5 15 75 0 0


TrippingCoil 1 0 0 200 0ClosingCoil 1 0 0 0 200Springchargingformotor 1 0 0 0 200Antipumpingrelay94(PLA) 1 6 6 0 0

6.6KVHTPANEL

6.6KVOutgoing(VCB)forTransformer(X5Nos.)

6.6KVOutgoing(VCB)forCapacitorPanel(X1no.)

6.6KVHTPANEL

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Feeder LoadDescription Quantity ContinousLoad TotalContinousLoad TrippingLoad ClosingLoad0~600min 0~600Min 0~1min(FirstMinute) 599~600min(LastMinute)

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DCLOADCALCULATION(inWATT)SUBSTATION


Worksheet3


MasterTripRelay86(VAJHM23) 1 5 0 5 0TripCktSupervisionRelay95(VAX31) 1 3 3 0 0MicomP127Relay 1 4 4 0 0DigitalMultiFunctionMeter 1 4 4 0 0Annunciator(8Window) 1 12 12 0 0AuxiliaryRelay(VAA33) 1 9 9 0 0Hooter 1 15 15 0 0


IndicationLamps 8 2 16 0 0Annunciator(12Window) 1 18 18 0 0Hooter 1 0 0 0 0

BatteryChargerPanel

Hooter 1 0 0 0 0

TrippingCoil 1 0 0 200 027UnderVoltageRelay 1 4 4 0 0MicroLogicRelease 1 2 2 0 0

Buscoupler TrippingCoil 1 0 0 200 0ClosingCoil 1 0 0 0 0MicroLogicRelease 1 2 2 0 0

a) 827.48

b) 1813.50

c) 2000.00

IncomerfromTransformer

PMCCPanel

LastMinuteLoadin(W)Between(599~600Min)

ContinousLoadin(W)For0~600MinuteFirstMinuteLoadin(W)Between(0~1Min)

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LOADPROFILE(WATT/AMP)CONTINUOUSLOAD TRIPPING* CLOSING/CHARGING*

(0~600MIN) (0~1MIN) (599~600MIN)

1 827.48 1,814 2,000

2 7.52 16.49 18.18

NOTES:

*:Momentaryloads

LOADCYCLECALCULATION:

Sr.No.

DCLoadInWattage

InAMPEREDCLoadInAmpere

REMARKS

InWATT

DESCRIPTION

110VDC

0

0

0

TOTALLOADSUMMARYOF110VDCSYSTEM(SS1ORSS2SUBSTATION)BATTERYLOADCYCLEDIAGRAM


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Worksheet4

SYSTEMVOLTAGE(VDC) = 110 Volts TOTAL

a)CONTINUOUSLOAD(AMPS)FROM0to600MINUTES = 7.52 Amps A2

b)FIRSTMINUTELOAD(AMPS)FROM0to1MINUTE = 16.49 7.52 24.01 Amps A1

c)LASTMINUTELOAD(AMPS)FROM599TO600MINUTE = 18.18 7.52 25.70 Amps A3

BATTERYDUTYCYCLE = 600 MINUTES

BATTERYDUTYCYCLETABLE:

0 0.00

0 24.01

1 24.01

1 7.52

599 7.52

599 25.70

600 25.70

600 25.70

TIME(MINUTES) CURRENT(AMPS)

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BATTERYDUTYCYCLE:

24.01

7.52 7.52

25.70

5.00

10.00

15.00

20.00

25.00

30.00

CU

RR

ENT-

AM

P

BATTERY DUTY CYCLE

0.00 0 50 100 150 200 250 300 350 400 450 500 550 600 650

TIME-MINUTE

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NOMINALSYSTEMVOLTAGE : VDC (ASPERTECHNICALSPECIFICATION)MINIMUMSYSTEMVOLTAGE(10%) : VDC (ASPERTECHNICALSPECIFICATION)MAXIMUMSYSTEMVOLTAGE(+10%) : VDC (ASPERTECHNICALSPECIFICATION)NOMINALCELLVOLTAGE(NCV) : VDC (ASPERIEEE1115ANDTECHNICALSPECIFICATION)ENDCELLVOLTAGE(ECV) : VDC (ASPERMANUFACTURER'SCATALOGUE)FLOATCELLVOLTAGE(FCV) : VDC (ASPERMANUFACTURER'SCATALOGUE)BOOSTCELLVOLTAGE(BCV) : VDC (ASPERMANUFACTURER'SCATALOGUE)AGINGFACTOR : (ASPERIEEE4851997)


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DOCUMENT TITLE

110

BATTERYAMPEREHOURSIZINGCALCULATION

DOCUMENT NO.


EL00211 REV.- 03

0

1.25

Worksheet5

99

123.2


2.0

1.85

2.60

0.00

DESIGNMARGIN20% : (ASPERIEEE4851997)TEMPERATURECORRECTIONFACTOR : (ASPERIEEE4851997)

BATTERYDUTYCYCLEBATTERYBACKUPTIME : MINUTES (ASSUMEDBYSEI)

A1 : AMPSFORFIRST MINUTEFOLLOWEDBY

A2 : AMPSFOR MINUTEFOLLOWEDBY

A3 : AMPSFORLAST MINUTE

CAPACITYFACTOR(KT)ASPERMANUFACTURER'SCATALOUGE

24.01

7.52

600 10.00

DURATION(MINUTE) CAPACITYFACTOR1 1.18

598 9.80

599 9.90

1

1

25.70

599

1.20

1.25

600

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CALCULATIONOFBATTERYAMPEREHOURASPERIEEE485

(7)(1) (2) (3) (4)

PERIOD LOADS(AMPS) CHANGEINLOADS(AMPS)

(5) (6)

DURATIONOFOPERATION(MINUTES)

TIMETOENDSECTION(MINUTES)

CAPACITYRATINGFACTORATtMIN.RATE(Kt)

POS.VALUE NEG.VALUE

SECTION1FORFIRSTPERIODONLYANDIFA2>A1THENGOTOSECTION21 A1 24.01 A10 0.00

REQUIREDSECTIONSIZE(3)x(6)RATEAHHRS

T=M1 1M1=1 124.01 28.331.18

SECTION1SUBTOTALAH 28.33 0.00

MIN.CAPACITYREQD.AT27C = AH AHt2= AHt1(1+(k(t2t1)/100))BYAPPLYINGTEMP.CORRECTIONFACTOR = AH AHt1= 98.33BYAPPLYINGAGINGFACTOR = AH k= 0.43 (AsperIS:2651)BYAPPLYINGDESIGNMARGIN = AH t2= 27

t1= 8AH = AH@8C

AH (ASPERSPECIFICATIONVOLUMEIVOFVPAGE57OF272)

SECTION1TOTALAH 28.33

0.00T=M1+M2 599 9.90 237.69A1 24.01

0.00T=M1+M2+M3 600 10.000

A10 24.01 M1 1SECTION2FORFIRSTTWOPERIODSONLYANDIFA3>A2THENGOTOSECTION3

1

598 T=M2 598

SECTION2TOTALAH 76.12

7.52 A2A1 16.49 9.80

240.09

0.00

SECTION3FORFIRSTTHREEPERIODSONLYANDIFA4>A3THENGOTOSECTION41 A10 24.01

M2 598 T=M2+M32 A2 7.52 A2A1M1 1A1 24.01

161.57

SECTION2SUBTOTALAH 237.69 161.57

2 A2 M2

0.003 A3 25.70 A3A2599 9.900 0.00 163.2216.49

T=M3 1 1.180 21.4518.18 M3 1

BATTERYAHcalculated 184

BATTERYAHSELECTED/PROVIDED@27C 200

SECTION3TOTALAHSECTION3SUBTOTALAH 261.54 163.22

98.33

98.33

122.91

153.64

184.37

106.36

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= 2.0 VoltsDC= 110 VoltsDC= 2.25 VoltsDC= 1.85 VoltsDC= 110 VDC,+10%to15%= 121.00 VDCto 93.50 VDC

= MaximumSystemVoltage/FloatChargingVoltage

= 121.00 / 2.25

= 53.78 Cells

EndCellVoltageAllowableSystemVoltage

MaximumNo.ofCells

NominalVoltagePerCellNominalBatteryBankVoltageFloatVoltagePerCell


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Worksheet6

0

0

0

0

CALCULATIONFORQUANTITYOFCELLS

= MinimumSystemVoltage/EndCellVoltage

= 93.50 / 1.85

= 50.54 cells

= 55

MaximumBatteryVoltageconsidering55cellsandfloatvoltageof2.25Volts = 123.75 VDC

MinimumBatteryVoltageconsidering55cellsandEndCellVoltageof1.85Volts = 101.75 VDC

PermissibleEndCellVoltage=(90%of110V)/(MaxNo.ofCells)= 1.84 VDC SelectedECVofeachCell

Calculated,No.ofCellsinBatteryBank 53.78 Nos.

SelectedNo.ofCellsinBatteryBank 55 Nos.

No.ofCellsselected

MinimumNo.ofCells

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INCOMING :

Voltage : VAC

Freqyency : Hz

OUTGOUING :

Voltage : VDC

LOADCYCLE :: Amps for Min

: Amps for Min

599

FirstMinuteLoad(A1) 24.01 1

505%

110

ContiniousLoad(A2) 7.52

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BATTERYCHARGERSIZING

DOCUMENT TITLE DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2

DOCUMENT NO. EL00211 REV.- 03


1.Overall Electrical Single Line Diagram For SS-1(DHC Tail End) (DrawingNo.EL00001, Rev.-F )2.Technical Specification of Battery ,Battery Charger & DC Distribution BoardVolume - IV of V Page-55 of 272 Section 2.3

Worksheet7

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41510%

LastMinuteLaod(A3) : Amps for Min

Cellselected : AHChargingDuration : Hour

200

10

25.70 1

BATTERYCAPACITY:

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DOCUMENT TITLE DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2

DOCUMENT NO. EL00211 REV.- 03


1.Overall Electrical Single Line Diagram For SS-1(DHC Tail End) (DrawingNo.EL00001, Rev.-F )2.Technical Specification of Battery ,Battery Charger & DC Distribution BoardVolume - IV of V Page-55 of 272 Section 2.3

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CHARGERTYPEFloatcumTricklecumBoostChargerDesignMargin20% : (ASPERIEEE4851997)

CHARGERRATING:A= (DMxL1)+ (BIFxAH)

(RT)Where,

A = ChargeroutputcurrentinampereDM = DesignMargin20% = 1.20 (ASPERIEEE4851997)L1 = ContinuousDCLoadCurrent = 24BIF = BatteryInefficiencyfactorduetolosses = (ASPERIEEE946:1992)AH = BatteryAmpereHourCapacity = 200RT B tt R h Ti 10

1.1

1.20

RT = BatteryRechargeTime = 10L1 =

L1 =

Therefore, A = Chargeroutputcurrentinampere = AmpsHENCE,SELCTEDRATINGFORTHEBATTERYCHARGER : AMPS

BATTERYCHARGERSIZINGCALCULATIONFORFLOATCHARGER

CONTINUOUSDCLOADCURRENT(ICC)= =DESIGNMARGIN(25%)= =FLOATCHARGINGCURRENT(Itc)= =

THETOTALREQUIREDCAPACITYOFTHEFLOATCHARGERISCALCULATEDAS:=ICCx1.25+ITC= X +

REQUIREDCAPACITYOFFLOATCHARGER= = A

BATTERYCHARGERSIZINGCALCULATIONFORBOOSTCHARGERDCNOMINALVOLTAGE = V

BOOSTCHARGINGRATING = 20%OFAhOFBATTERY= X= A

DESIGNMARGIN =BATTERYCHARGERRATING = ABATTERYCHARGERRATINGISSELECTEDFROMHIGHEROFFLOAT&BOOSTCHARGINGCURRENT,HENCE,CALCULATEDCAPACITYOFBOOSTCHRGER AmpsSELECTEDCAPACITYOFBOOSTCHRGER= = 50AMPS2NOS,100%RATEDFLOATCUMBOOSTCHARGERASPERSPECIFICATION

20%

48

18.20

110

0.2 200

8 1.25 8.80

8

1.25

8.80A(@160mApercellX55Nos.cells,asperManufcaturercatalogue)

51.00

48

40.0

50

[ DC load of Control, Indication and Annunciation Circuit in normal operation] + [ Momentary Closing & TrippingLoad]+[FloatChargingCurrentofBattery]

24.41 Amps

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Battery Charger Sizing SS 1,Rev 03

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