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DOCUMENT TITLE
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
PROJECT
CLIENT
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
PROJECT 0
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EL00211 REV.- 03
0
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
0
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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WORKSHEET1
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EL00211 REV.- 03
0
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
0
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
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
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
EL00211 REV.- 03
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 of272 S ti 2 3
0
REFERENCECATALOGUE
PROJECT 0
CLIENT 0
Worksheet2
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DOCUMENT TITLE
DOCUMENT NO.
0
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
EL00211 REV.- 03
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 of272 S ti 2 3
0
PROJECT 0
CLIENT 0
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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DOCUMENT NO.
0
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
EL00211 REV.- 03
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 of272 S ti 2 3
0
PROJECT 0
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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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DOCUMENT TITLE
DOCUMENT NO.
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)
EL00211 REV.- 03
0
0
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CLIENT 0
REFERENCE DOCUMENT NO.
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DCLOADCALCULATION(inWATT)SUBSTATION
6.6KVHTPANEL
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
Worksheet3
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
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
AuxContactor 1 10 10 0 0IndicationLamps 70 2 140 0 0TimerR1/R2 10 3 30 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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DOCUMENT TITLE
DOCUMENT NO.
Feeder LoadDescription Quantity ContinousLoad TotalContinousLoad TrippingLoad ClosingLoad0~600min 0~600Min 0~1min(FirstMinute) 599~600min(LastMinute)
EL00211 REV.- 03
0
0
PROJECT
CLIENT 0
REFERENCE DOCUMENT NO.
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DCLOADCALCULATION(inWATT)SUBSTATION
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
Worksheet3
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
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
AuxContactor 1 10 10 0 0IndicationLamps 9 2 18 0 0TimerR1/R2 2 3 6 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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REFERENCE DOCUMENT NO.
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
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
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 of 272 Section 2.3
0
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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REFERENCE DOCUMENT NO.
0
0
0
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
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 of 272 Section 2.3
0
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)
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
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DOCUMENT TITLE
110
BATTERYAMPEREHOURSIZINGCALCULATION
DOCUMENT NO.
REFERENCE DOCUMENT NO.
EL00211 REV.- 03
0
1.25
Worksheet5
99
123.2
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-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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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
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DOCUMENT TITLE
DOCUMENT NO.
REFERENCE DOCUMENT NO.
EL00211 REV.- 03
0
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
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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REFERENCE DOCUMENT NO.
= 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
DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
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 of 272 Section 2.3
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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CLIENT 0
BATTERYCHARGERSIZING
DOCUMENT TITLE DC BATTERY & BATTERY CHARGER SIZING CALCULATION FOR SS-1 & SS-2
DOCUMENT NO. EL00211 REV.- 03
REFERENCE DOCUMENT NO.
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
CONTRACTOR 0
CONSULTANTS 0
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
REFERENCE DOCUMENT NO.
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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