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To Size the required ampere hour capacity of the battery and current rating of battery charger in large substations.
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DE
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110V
Bat
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& B
atte
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harg
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alcu
latio
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ubm
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for
app
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BY
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REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. KandiahDATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 1 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
DESIGN CALCULATION
OF
110V Battery and Battery Charger Sizing Calculations
THIS DRAWING IS NOT TO BE USED FOR
CONSTRUCTION OR FOR ORDERING
MATERIALS UNTIL CERTIFIED AND
DATED
CE
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K'D
TABLE OF CONTENTS
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Page
1 - 110V Battery Bank Sizing Calculations 3
2 - 110V Battery Charger Sizing Calculations 10
BY
DA
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NO
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###
REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 2 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
TH
IS D
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WIN
G A
ND
TH
E IN
FO
RM
AT
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CO
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AIN
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HE
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IN A
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OF
SA
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. NO
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OF
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CH
K'D
DE
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110V
Bat
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& B
atte
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harg
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alcu
latio
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ubm
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for
app
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A. 110V BATTERY BANK SIZING CALCULATIONS
1- SCOPE
To meet the requirements as per SOW of Al-Leith 33/13.8kV substation, this document deals with sizing 110V battery bank to cater for new as well as relocated equipment in substation building. 110V DC system shall consist of 1 No. battery bank and charger.
2 - CALCULATIONS
The calculations for sizing the battery are based on IEEE-1115
2-1 CELL SIZING CALCULATIONS :
The station DC auxillary power supply parameters for DC Control System are as follows.
Battery Type = Ni-Cad
Nominal DC system Voltage = 110 V
Minimum allowable system voltage percentage = 0.9
End cell voltage = 1.1 V
Minimum Allowable DC system Voltage = 99 V
BY Number of cells Required ( Ncell ) = Minimum Allowable DC system Voltage
End cell voltage
DA
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( Ncell ) = 99/1.1
= 90 Cells
NO
.
###
REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 3 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
RT
'DA
PP
VD
TH
IS D
RA
WIN
G A
ND
TH
E IN
FO
RM
AT
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CO
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AIN
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HE
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IN A
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PR
OP
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TY
OF
SA
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I ELE
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RIC
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CO
. NO
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PR
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2.2 LOAD CALCULATION :
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Continuous load of 401.2 W ( 3.65A ) for Duration of 8 hours is considered. Load details are given in Table - 1
TABLE-1
Sl.No. Description Qty
Continuous Loads
1 33kV feeder Panel (+ARH05 ) 1 75.2 75.2
2 33kV Bus Coupler feeder Panel (+ARH07 ) 1 24.4 24.4
3 33kV Bus bar Protection Panel ( +ARHBB02 ) 1 29.8 29.8
4 33kV Transformer Protection Panel ( +ARH06 ) 1 61.2 61.2
5 33kV Transformer AVC Panel ( +AVC3) 1 77.3 77.3
6 33kV Transducer Panel 1 133.3 133.3
TOTAL 401W
TOTAL CONTINUOUS CURRENT 401.2/110 3.65A
BY
DA
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NO
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###
REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 4 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
Unit Load (Watt)
Total Load (Watt)
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
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TH
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OF
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2.3 TRIPPING LOADS
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Unit Loads for Trip Coils have been given table-2
a) Worst Critical case of assessing the momentary Loading :
i ) Worst Critical case assessing the momentary loading has been assessed which involves simultaneous tripping of 5 Nos. of 33kV CBs on 33kV bus fault and 8 Nos. of 13.8kV CBs on 13.8kV bus fault
Load of 5 x 2 No. Trip Coils = 5 x 2 x 50 = 500 W
Load of 8 x 2 No. Trip Coils = 8 x 2 x 50 = 800 W
Total Trip Coils = 1300 W
Nominal DC system Voltage = 110 V
Total Tripping Current = 11.82 A
2.4 RESTORATION LOADS
Momentary Loading for restoration is considered as the load for closing 2 no. 33kV CB, 1 Nos. of 13.8kV CBs, tripping of 1 No. of 13.8kV CB ( if the fault persists ) and 1 No. of Spring Charging motor running. Load details are given in table 2
i) Load of 2 33kV closing CB = 2 x 50 = 100 Wii) Load of 1 13.8kV closing CBs = 1 x 50 = 50 Wiii) Load of 1 13.8kV Tripping CB = 1 x 50 = 50 Wiv) Load of one operating motor = 1 x 380 = 380 W
running
BY Total = 580 W
DA
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Total Restoration Current = 5.27 A
Table - 2
NO
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MOMENTARY LOADS
REVISIONSSl.No Description Qty
DRAWN
BY: Shabeer.A a) 33kV Switchgear ( assumed)DATE: 10/08/2008 Circuit Breakers
CHECKED Trip Coil-1 1 50 50BY: K. Kandiah Trip Coil-2 1 50 50DATE: 10/08/2008 Closing Coil 1 50 50
OPRG DEPT b) 13.8kV SwitchgearBY: Circuit BreakersDATE: Drive Mechanism 1 380 380
ENG'G DEPT Trip Coil-1 1 50 50BY: Trip Coil-2 1 50 50DATE: Closing Coil 1 50 50
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 5 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
Unit Load (Watt )
Total Load (Watt )
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
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OF
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2.5 EMERGENCY LOAD
DE
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l of 9 incandascent lamps of 40W each are switched on at any given time by the maintenance
personnel who reach the substation within 1.5 hours of power failure
3 LOAD SUMMARY :
The respective loads are listed below. Duty cycle is given in Annex-1
Continuous Load - 8 hours = 3.647 A
Momentary Tripping Load - 1 min. = 11.82 A
Momentary Restoration Load - 1 min. = 5.273 A
Emergency Lighting Load - 1.5 Hours = 2.88 A
4 BATTERY SIZING WORKSHEET :
Given in Annexure II and III.
5 BATTERY CURVE/ DATA :
Manufactures Data are given in Annexure IV.
6 CALCULATION OF REQUUIRED SIZE :
Maximum uncorrected size = 107.85
BY
Temperature Correction = 1.20 (Refer IEEE-1106, Table A.1)
DA
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(at minimum Temp = -5°C)
Design Margin = 1.15
Aging Factor = 1.25
NO
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REVISIONSDRAWN Required Capacity = Uncorrected Size x Design Margin x Aging factor
BY: Shabeer.A x Temperature Correction FactorDATE: 10/08/2008
CHECKED
BY: K. Kandiah Required Capacity = 107.84948 x 1.15 x 1.25 x 1.2DATE: 10/08/2008
OPRG DEPT
BY: Required Capacity = 186.04 Ah DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 6 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
Emergency Lighting load for 1.5 hours is considered as 360W ( 2.88A ) maximum number
Ah
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
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7 - CONCLUSION
Required Battery Ah capacity = 186.0 Ah
Nearest available size = 208 Ah
The Total Ampere - hour capacity may be used to determine the intial cell size,the total capacity = 186.0 Ah and the choosen battery is SBM208 Rated Capcity = 208 Ah
BY
DA
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###
NO
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###
REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 7 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
RT
'DA
PP
VD
TH
IS D
RA
WIN
G A
ND
TH
E IN
FO
RM
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ION
CO
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AIN
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HE
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IN A
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TH
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OLE
PR
OP
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TY
OF
SA
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I ELE
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RIC
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CO
. NO
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PR
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UC
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FU
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PA
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ALL
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OB
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D F
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DE
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110V
Bat
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& B
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latio
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for
app
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l A1 = Continuous Load + momentary Tripping = 15.47 A
A2 = Continuous Load = 3.647 A
A3 = Continuous + Emergency = 6.527 A
A4 = Continuous = 3.647 A
A5 = Continuous + Restoration = 8.92 A
BY
DA
TE
###
NO
.
###
REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 8 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
RT
'DA
PP
VD
TH
IS D
RA
WIN
G A
ND
TH
E IN
FO
RM
AT
ION
CO
NT
AIN
ED
HE
RE
IN A
RE
TH
E S
OLE
PR
OP
ER
TY
OF
SA
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I ELE
CT
RIC
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CO
. NO
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PR
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UC
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FU
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PA
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ANNEXURE - 1
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AM
PE
RE
A1= 15.5A
A5=8.92A
BY
5.27
AA3=6.53A
DA
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###
2.88AA2=A4=3.65A
NO
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###
REVISIONSDRAWN
BY: Shabeer.A
DATE: 10/08/2008
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT M1 M2 M3 M4 M5BY:
DATE:
ENG'G DEPT 0 1 ### 180 479 480 MINUTESBY:
DATE: Al-Leith 33/13.8kV Substation Load duty cycle profile for CERTIFIED 110V DC Battery Sizing Calculation
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 9 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
RT
'DA
PP
VD
TH
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WIN
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OR
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D H
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EIN
AR
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PR
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TY
OF
SA
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RIC
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CO
. N
O R
EP
RO
DU
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ION
IN
FU
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OR
IN
PA
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SH
AL
L B
E O
BT
AIN
ED
FR
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TH
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OC
UM
EN
T W
ITH
OU
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HE
WR
ITT
EN
CO
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EN
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F I
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K'D
B. 110V BATTERY CHARGER SIZING CALCULATIONS
DE
SC
RIP
TIO
N
110
V B
atte
ry &
Ba
ttery
ch
arg
er
Siz
ing
Ca
lcu
latio
ns
Su
bm
itte
d fo
r a
pp
rova
l 1 - SCOPE :
To meet the requirements as per SOW of Al-Leith 33/13.8kV substation, this document deals with sizing 110V battery charger to cater for new as well as relocated equipment in existing SWGR building. DC system shall have one battery float / boost charger.
2 - CALCULATIONS :
The ampere hour rating of a battery charger is determined by equation which is as perTechnical specification
A = (1.25 X L)+ (BIF X AHR) ) / 0.83 1RT
Where :
A = required charger rating in amperes
L = Maximum Required DC load in amperes = 3.6( Continuous load is considered )
BIF = Battery inefficiency factor = 1.1
AHR = Ampere hour removed during discharge = 208(Maximum discharger is considered)
RT = Recharge time in hours = 16
BY
DA
TE
### Subsitituting the above values in Equ - 1
= [ (1.25 x 3.2 ) + (1.1 x 200) ] / 0.83
NO
.
### ###
REVISIONS
DRAWN = 22.72BY: Shabeer.A
DATE: 10/08/2008 Next higher size available = 50ACHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE: The battery Charger Current Size = 50AENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 10 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
AR
AR
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
CE
RT
'DA
PP
VD
TH
IS D
RA
WIN
G A
ND
TH
E IN
FO
RM
AT
ION
CO
NT
AIN
ED
HE
RE
IN A
RE
TH
E S
OLE
PR
OP
ER
TY
OF
SA
UD
I ELE
CT
RIC
ITY
CO
. NO
RE
PR
OD
UC
TIO
N IN
FU
LL O
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PA
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ANNEXURE -II
DE
SC
RIP
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N
110V
Bat
tery
& B
atte
ry c
harg
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izin
g C
alcu
latio
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ubm
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l REFERENCE : IEEE Std. 1115-2000
Minimum Cell Voltage : 1.1 V
Cell Mfg. : SAFT
to Std % end of discharge)
= Ampere that will be supplied for T minute at 25 ºC
to given end of discharge voltage
The Kt factor for time t is calculated in the table by interpolation using the formula
= -
End voltage discharge voltage of cell = 1.1 V
Rated Ampere hour capacity = 208 Ah
BY
Sl.No T minute Total Ampere
DA
TE
### 1 1 354 0.588
2 90 93.9 2.215
NO
.
###
3 180 60.6 3.432REVISIONS
DRAWN4 479 25.65 8.109
BY: Shabeer.A
DATE: 10/08/20085 480 25.60 8.125
CHECKED
BY: K. Kandiah
DATE: 10/08/2008
OPRG DEPT
BY:
DATE:
ENG'G DEPT
BY:
DATE:
CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 11 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
CALCULATION OF CAPACITY RATING FACTOR.( KT )
Rated Ampere hour capacity (Ay std. Time Rate at 25 ºC
KT
(Kt2 - Kt1) x ( t2 - t )
Kt Kt2 ( t2 - t1 )
Calculation of K T Factor :
KT Factor
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
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ITS
OW
NE
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K'D
ANNEXURE-III
DE
SC
RIP
TIO
N
110V
Bat
tery
& B
atte
ry c
harg
er S
izin
g C
alcu
latio
ns S
ubm
itted
for
app
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l period Load (A) KT factor+ve value -ve value
Section - 1 first period only
1 A1-0= 15.50 M1 = 1.0 T = M1 = 1.0 0.5880 9.11
Total 9.11
Section - 2 first two periods only
1 A1-0= 15.50 M1 = 1.0 T =M1+M2 = 90 2.2150 34.33
2 M2 = 89.0 T = M2 = 89.0 2.1970 -26.03
Total 8.30
Section - 3 first three periods only
1 A1-0= 15.50 M1 = 1.0 3.4320 53.20
2 M2 = 89.0 3.4190 -40.52
3 M3 = 90.0 2.2150 6.38
Total 19.06
Section - 4 first four periods only
1 A1-0= 15.50 M1= 1.0 8.1080 125.67
BY 2 M2 = 89.0 8.0920 -95.89
DA
TE
###
3 M3 = 90.0 6.6070 19.03
4 M4 = 299 5.1090 -14.71
Total 34.10
NO
.
###
Section - 5 first five periods onlyREVISIONS
DRAWN1 A1-0= 15.50 M1 = 1.0 8.1250 125.94
BY: Shabeer.A
DATE: 10/08/20082 M2 = 89.0 8.1080 -96.08
CHECKED
BY: K. Kandiah3 M3 = 90.0 6.6240 19.08
DATE: 10/08/2008
OPRG DEPT4 M4 = 299 5.1230 -14.75
BY:
DATE: 5 M5 = 1.0 0.5880 3.10
ENG'G DEPT
BY: Total 37.28
DATE: SECTION - 1 to 5 (TOTAL) 107.85CERTIFIED
BY:
DATE:
DRAWING TITLE DRAWING NO. SHEET NO. REV NO.
REINFORCEMENT OF Al Leith 33/13.8kV S/SAG/ALS/E-342 12 of 13 0
110V Battery & Battery charger Sizing Calculations
JEDDAH SAUDI ARABIA JOB ORDER NO 20641055/00 DWG CONT SHT AG/ALS/G-001
change in load (A)
Duration of operation
(min)
time to end of section (min)
Require section size (Ah)
A1 = 15.50
A1 = 15.50
A2 = 3.65
A2-A1= -11.85
A1 = 15.50
T = M1+M2+M3 = 180.0
A2 = 3.65
A2-A1= -11.85
T = M2+M3 = 179.0
A3 = 6.53
A3-A2= 2.88
T = M3 90.0
A1 = 15.50
T = M1+M2+M3+M4 =
479.0A2 = 3.65
A2-A1= -11.85
T = M2+M3+M4 = 478.0
A3 = 6.53
A3-A2= 2.88
T = M3+M4= 389.0
A4 = 3.65
A4-A3= -2.88
T =M3 299.0
A1 = 15.50
T = M1+M2+M3+M4 =
480.0000A2 = 3.65
A2-A1= -11.85
T = M2+M3+M4+M5 =
479.0A3 = 6.53
A3-A2= 2.88
T = M3+M4+M5= 390
A4 = 3.65
A4-A3= -2.88
T = M4+M5 300
A5 = 8.92
A5-A4= 5.27
T = t4 1.0000
THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR
FOR ORDERING MATERIALS UNTIL
CERTIFIED AND DATED
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