Industrial battery sizing calculation sheet with all formulas and proceduresFull description
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Battery sizing calculationsFull description
The Batteries form a significant part of many electronic devices. Typical electrochemical batteries or cells convert chemical energy into electrical energy. Batteries based on the charging ability are classified into primary and secondary cells. Seco
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
CHK'D APPVD CERT'D DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
BY DATE
10-Aug-08
OF
0
NO.
DESIGN CALCULATION
1-
110V Battery Bank Sizing Calculations
2-
110V Battery Charger Sizing Calculations
3 10
DATE
10-Aug-08 0
NO.
REVISIONS DRAWN 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: THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
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Page
BY
DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
TABLE OF CONTENTS
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
=
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
( Ncell )
=
V
Minimum Allowable DC system Voltage End cell voltage
=
99/1.1
=
90
Cells
0
NO.
DATE
10-Aug-08
BY
Number of cells Required ( Ncell )
Ni-Cad
REVISIONS DRAWN 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: THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
CHK'D APPVD CERT'D DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
Continuous load of 401.2 W ( 3.65A ) for Duration of 8 hours is considered. Load details are given in Table - 1
BY
DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
2.2 LOAD CALCULATION :
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
2.4
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
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) ii) iii) iv)
DATE
10-Aug-08
DRAWN BY:\ Shabeer.A
2 x 50 1 x 50 1 x 50 1 x 380
= = = =
100 50 50 380
W W W W
Total
=
580
W
Total Restoration Current
=
5.27
A
MOMENTARY LOADS Sl.No a)
DATE: 10/08/2008
CHECKED BY: K. Kandiah DATE: 10/08/2008
OPRG DEPT
= = = =
Table - 2
0
NO.
REVISIONS
Load of 2 33kV closing CB Load of 1 13.8kV closing CBs Load of 1 13.8kV Tripping CB Load of one operating motor running
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
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TRIPPING LOADS
BY
DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
2.3
The respective loads are listed below. Duty cycle is given in Annex-1
4
Continuous Load
-
8 hours
=
3.65
A
Momentary Tripping Load
-
1 min.
=
11.8
A
Momentary Restoration Load
-
1 min.
=
5.27
A
Emergency Lighting Load
-
1.5 Hours
=
2.88
A
BATTERY SIZING WORKSHEET : Given in Annexure II and III.
5
BATTERY CURVE/ DATA : Manufactures Data are given in Annexure IV.
6
CHK'D APPVD CERT'D 10-Aug-08
DATE
LOAD SUMMARY :
CALCULATION OF REQUUIRED SIZE : 107.85 Ah
Maximum uncorrected size
=
Temperature Correction
=
Design Margin
=
1.15
Aging Factor
=
1.25
Required Capacity
=
Uncorrected Size x Design Margin x Aging factor x Temperature Correction Factor
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
3
0
NO.
EMERGENCY LOAD Emergency Lighting load for 1.5 hours is considered as 360W ( 2.88A ) maximum number 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
BY
DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
2.5
=
Nearest available size
=
186.0 Ah 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
DATE
10-Aug-08 0
NO.
REVISIONS DRAWN 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: THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
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Required Battery Ah capacity
BY
DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
7 - CONCLUSION
Continuous Load + momentary Tripping
=
15.5 A
A2
=
Continuous Load
=
3.65 A
A3
=
Continuous + Emergency
=
6.53 A
A4
=
Continuous
=
3.65 A
A5
=
Continuous + Restoration
=
8.92 A
DATE
10-Aug-08 0
NO.
REVISIONS DRAWN 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: THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
CHK'D APPVD CERT'D DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
=
BY
A1
AMPERE
1
A1= 15.5A
5.27 A
A5=8.92A
2.88A A2=A4=3.65A
0
NO.
DATE
10-Aug-08
A3=6.53A
REVISIONS DRAWN BY: Shabeer.A DATE: 10/08/2008
CHECKED BY: K. Kandiah DATE: 10/08/2008
M1
OPRG DEPT
M2
M3
M4
M5
BY: DATE:
0
ENG'G DEPT
1
90
180
479
480
MINUTES
BY:
Al-Leith 33/13.8kV Substation Load duty cycle profile for 110V DC Battery Sizing Calculation
DATE:
CERTIFIED BY: DATE: THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
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DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
ANNEXURE -
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
CHK'D APPVD CERT'D
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 per Technical specification A
=
(1.25 X L)+ (BIF X AHR) ) / 0.83 RT
1
Where : A
=
required charger rating in amperes
L
=
Maximum Required DC load in amperes ( Continuous load is considered )
=
3.6
BIF
=
Battery inefficiency factor
=
1.1
AHR
=
Ampere hour removed during discharge (Maximum discharger is considered)
Rated Ampere hour capacity (Ay std. Time Rate at 25 ºC 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 (Kt2 - Kt1) x ( t2 - t ) Kt
= Kt2
( t2 - t1 )
-
End voltage discharge voltage of cell
=
1.1 V
Rated Ampere hour capacity
=
208 Ah
Calculation of K T Factor :
0
DATE NO.
10-Aug-08
BY
110V Battery & Battery charger Sizing Calculations Submitted for approval
CALCULATION OF CAPACITY RATING FACTOR.( KT )
Sl.No
T minute
Total Ampere
KT Factor
1
1
354
0.588
2
90
93.9
2.215
3
180
60.6
3.432
4
479
25.65
8.109
5
480
25.60
8.125
REVISIONS DRAWN 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: THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
CHK'D APPVD CERT'D
ANNEXURE -II
1
KT factor
Require section size (Ah) +ve value
A1 = 15.50
A1-0= 15.50
M1 = 1.0
T = M1 =
1.0
0.5880
-ve value
9.11
Total
9.11
Section - 2 first two periods only 1 2
A1 = 15.50 A2 = 3.65
A1-0= 15.50 A2-A1= -11.85
M1 = 1.0 M2 = 89.0
T =M1+M2 = 90 T = M2 =
89.0
2.2150
34.33
2.1970
-26.03
Total
8.30
Section - 3 first three periods only 1 2 3
A1 = 15.50 A2 = 3.65 A3 = 6.53
A1-0= 15.50 A2-A1= -11.85 A3-A2= 2.88
T = M1+M2+M3 = 180.0 T = M2+M3 = M2 = 89.0 179.0 T = M3 M3 = 90.0 90.0 M1 = 1.0
3.4320
53.20
3.4190 2.2150
-40.52 6.38
Total
19.06
Section - 4 first four periods only 1
10-Aug-08
DATE
time to end of section (min)
Section - 1 first period only
2 3 4
A1 = 15.50 A2 = 3.65 A3 = 6.53 A4 = 3.65
T= M1+M2+M3+M4 = A2-A1= T = M2+M3+M4 = M2 = 89.0 -11.85 478.0 A3-A2= T = M3+M4= M3 = 90.0 2.88 389.0 A4-A3= T =M3 M4 = 299 2.88 299.0
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
CHK'D APPVD CERT'D
change in period Load (A) load (A)
BY
DESCRIPTION
110V Battery & Battery charger Sizing Calculations Submitted for approval
