NO

.

0

REVISIONS

BY:

BY:

BY:

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

110V Battery & Battery charger Sizing Calculations

JEDDAH SAUDI ARABIA 20641055/00

0

REV NO.

DESIGN CALCULATION

OF

110V Battery and Battery Charger Sizing

Calculations

DRAWING TITLE SHEET NO.DRAWING NO.

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DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

Shabeer.A

K. Kandiah

DE

SC

RIP

TIO

ND

AT

E

10-A

ug-0

8

BY

110V

Battery

& B

attery

charg

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CH

K'D

Page

1 - 110V Battery Bank Sizing Calculations 3

2 - 110V Battery Charger Sizing Calculations 10

NO

.

0

REVISIONS

BY: Shabeer.A

BY:

BY:

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

DRAWING NO.

AG/ALS/E-342

110V

Battery

& B

attery

charg

er

Siz

ing C

alc

ula

tions S

ubm

itte

d for

appro

val

AP

PV

D

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'D

2 of 13

BY

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TIO

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TABLE OF CONTENTS

0

DWG CONT SHT

REV NO.DRAWING TITLE

JOB ORDER NO

110V Battery & Battery charger Sizing Calculations

SHEET NO.

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 = V

Minimum allowable system voltage percentage =

End cell voltage = V

Minimum Allowable DC system Voltage = V

Number of cells Required ( Ncell ) = Minimum Allowable DC system Voltage

End cell voltage

( Ncell ) = 99/1.1

= Cells

NO

.

0

REVISIONS

BY:

BY:

BY:

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

CERTIFIED

DATE:

0.9

DRAWING TITLE SHEET NO.

OPRG DEPT

DATE:

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DATE:

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DATED

110V Battery & Battery charger Sizing Calculations

DRAWING NO.

AG/ALS/E-342

AG/ALS/G-001

0

JOB ORDER NO 20641055/00 DWG CONT SHT

Shabeer.A

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

K. Kandiah

BY

CH

K'D

DE

SC

RIP

TIO

ND

AT

E

10-A

ug-0

8110V

Battery

& B

attery

charg

er

Siz

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alc

ula

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val

99

CE

RT

'DA

PP

VD

90

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REV NO.

110

1.1

3 of 13

LOAD CALCULATION :

Continuous load of 401.2 W ( 3.65A ) for Duration of 8 hours is considered.

Load details are given in Table - 1

TABLE-1

NO

.

0

REVISIONS

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BY

5

AG/ALS/G-001

Shabeer.A

K. Kandiah

110V Battery & Battery charger Sizing Calculations

SHEET NO.

4 of 13

DRAWING NO.

1

AG/ALS/E-342

6

3 1

33kV Transformer AVC Panel ( +AVC3)

1

61.24

133.3

29.8

61.2

77.3

133.3

29.8

1

77.3

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2.2

Sl.No.

1

TOTAL CONTINUOUS CURRENT

33kV Transformer Protection Panel ( +ARH06 )

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CH

K'D

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110V

Battery

& B

attery

charg

er

Siz

ing C

alc

ula

tions S

ubm

itte

d for

appro

val

CHECKED

DWG CONT SHTJOB ORDER NO 20641055/00

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Qty

24.4

Unit Load

(Watt)

33kV Bus Coupler feeder Panel (+ARH07 )

33kV Bus bar Protection Panel ( +ARHBB02 )

33kV Transducer Panel

33kV feeder Panel (+ARH05 )

Total Load

(Watt)

75.2

24.4

75.2

Continuous Loads

1

12

Description

0

REV NO.DRAWING TITLE

TOTAL 401W

3.65A401.2/110

2.3 TRIPPING LOADS

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 = W

Load of 8 x 2 No. Trip Coils = 8 x 2 x 50 = W

Total Trip Coils = W

Nominal DC system Voltage = V

Total Tripping Current = 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 = W

ii) Load of 1 13.8kV closing CBs = 1 x 50 = W

iii) Load of 1 13.8kV Tripping CB = 1 x 50 = W

iv) Load of one operating motor = 1 x 380 = W

running

Total = W

Total Restoration Current = A

Table - 2

NO

.

0 MOMENTARY LOADS

REVISIONS

BY:\

BY:

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REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

50

1 50 50CHECKED

1

1

Total Load

(Watt )

50

50

1300

110

11.82

Unit Load

(Watt )

50

500

800

110V

Battery

& B

attery

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'DB

YC

HK

'DD

ES

CR

IPT

ION

AP

PV

D

K. Kandiah

REV NO.

110V Battery & Battery charger Sizing Calculations

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

DA

TE

10-A

ug-0

8

Shabeer.A

OPRG DEPT

DATE:

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DATE:

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AG/ALS/G-001

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DRAWING TITLE

Drive Mechanism 1

5050

5.27

DWG CONT SHT

SHEET NO.

5 of 13

DRAWING NO.

1 50 50

JOB ORDER NO 20641055/00

100

50

50

380

580

380 380

Sl.No

a) 33kV Switchgear ( assumed)

QtyDescription

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b) 13.8kV Switchgear

Circuit Breakers

Circuit Breakers

Trip Coil-2

Closing Coil

Closing Coil

Trip Coil-1

50 50

Trip Coil-1 1

Trip Coil-2 1

2.5 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

3 LOAD SUMMARY :

The respective loads are listed below. Duty cycle is given in Annex-1

Continuous Load - 8 hours = A

Momentary Tripping Load - 1 min. = A

Momentary Restoration Load - 1 min. = A

Emergency Lighting Load - 1.5 Hours = 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 = Ah

Temperature Correction = (Refer IEEE-1106, Table A.1)

(at minimum Temp = -5C)

Design Margin =

Aging Factor =

NO

.

0

REVISIONS

Required Capacity = Uncorrected Size x Design Margin x Aging factor

BY: x Temperature Correction Factor

BY: Required Capacity = 107.84948 x 1.15 x 1.25 x 1.2

BY: Required Capacity = Ah

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

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SHEET NO.

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DRAWING NO.

AG/ALS/E-342

DRAWING TITLE TH

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BY

CH

K'D

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AT

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10-A

ug-0

8110V

Battery

& B

attery

charg

er

Siz

ing C

alc

ula

tions S

ubm

itte

d for

appro

val

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

Shabeer.A

K. Kandiah

186.04

CERTIFIED

DATE:

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DWG CONT SHT

REV NO.

0

AG/ALS/G-001

1.20

107.85

JOB ORDER NO 20641055/00

1.15

1.25

3.65

11.8

5.27

2.88

7 - CONCLUSION

Required Battery Ah capacity = Ah

Nearest available size = 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

NO

.

0

REVISIONS

BY:

BY:

BY:

BY:

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REINFORCEMENT OF Al Leith 33/13.8kV S/S

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AG/ALS/E-342

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208

REV NO.

186.0

SHEET NO.

7 of 13

DRAWING NO.

K. Kandiah

OPRG DEPT

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DATE:

THIS DRAWING IS NOT

TO BE USED FOR

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FOR ORDERING

MATERIALS UNTIL

CERTIFIED AND

DATED

110V Battery & Battery charger Sizing Calculations

DATE:

JOB ORDER NO

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

DA

TE

10-A

ug-0

8

Shabeer.A

110V

Battery

& B

attery

charg

er

Siz

ing C

alc

ula

tions S

ubm

itte

d for

appro

val

BY

CH

K'D

DE

SC

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OR

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ON

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OF

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IN

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A1 = Continuous Load + momentary Tripping = A

A2 = Continuous Load = A

A3 = Continuous + Emergency = A

A4 = Continuous = A

A5 = Continuous + Restoration = A

NO

.

0

REVISIONS

BY:

BY:

BY:

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

8.92

15.5

3.65

6.53

3.65

TH

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BY

OPRG DEPT

DATE:

ENG'G DEPT

CH

K'D

DE

SC

RIP

TIO

N

110V

Battery

& B

attery

charg

er

Siz

ing C

alc

ula

tions S

ubm

itte

d for

appro

val

10-A

ug-0

8

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

DA

TE

Shabeer.A

K. Kandiah

CERTIFIED

DATE:

THIS DRAWING IS NOT

TO BE USED FOR

CONSTRUCTION OR

FOR ORDERING

MATERIALS UNTIL

CERTIFIED AND

DATED

110V Battery & Battery charger Sizing Calculations

DRAWING TITLE

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DRAWING NO.

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0

REV NO.SHEET NO.

8 of 13

JOB ORDER NO 20641055/00 DWG CONT SHT

ANNEXURE - 1

A1= 15.5A

A5=8.92A

A3=6.53A

A2=A4=3.65A

NO

.

0

REVISIONS

BY:

BY:

M1 M2 M3 M4 M5

BY:

0 1 90 479 MINUTES

BY:

Al-Leith 33/13.8kV Substation Load duty cycle profile for

110V DC Battery Sizing Calculation

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

TH

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CH

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110V

Battery

& B

attery

charg

er

Siz

ing C

alc

ula

tions S

ubm

itte

d for

appro

val

BY

OPRG DEPT

10-A

ug-0

8

Shabeer.A

K. Kandiah

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

DA

TE

DWG CONT SHT

REV NO.

AG/ALS/G-001

SHEET NO.

DATE:

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DATE:

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DRAWING TITLE

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JOB ORDER NO 20641055/00

0

5.2

7 A

9 of 13

DRAWING NO.

2.88A

180 480

AM

PE

RE

B. 110V BATTERY CHARGER 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 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 1

RT

Where :

A = required charger rating in amperes

L = Maximum Required DC load in amperes =

( Continuous load is considered )

BIF = Battery inefficiency factor =

AHR = Ampere hour removed during discharge =

(Maximum discharger is considered)

RT = Recharge time in hours =

Subsitituting the above values in Equ - 1

AR = [ (1.25 x 3.2 ) + (1.1 x 200) ] / 0.83

NO

.

0 16

REVISIONS

AR =

BY:

Next higher size available = 50A

BY:

BY:

The battery Charger Current Size = 50A

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA AG/ALS/G-001

Shabeer.A

K. Kandiah

3.6

1.1

208

110V Battery & Battery charger Sizing Calculations

SHEET NO.

10 of 13

DRAWING NO.

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AG/ALS/E-342

BY

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CH

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10

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g-0

8

OPRG DEPT

DATE:

ENG'G DEPT

JOB ORDER NO 20641055/00 DWG CONT SHT

CERTIFIED

DATE:

THIS DRAWING IS NOT

TO BE USED FOR

CONSTRUCTION OR

FOR ORDERING

MATERIALS UNTIL

CERTIFIED AND DATED

CHECKED

DATE:

DRAWING TITLE

0

16

22.7

REV NO.

ANNEXURE -II

CALCULATION OF CAPACITY RATING FACTOR.( KT )

REFERENCE : IEEE Std. 1115-2000

Minimum Cell Voltage : 1.1 V

Cell Mfg. : SAFT

Rated Ampere hour capacity (Ay std. Time Rate at 25 C

to Std % end of discharge)

KT = Ampere that will be supplied for T minute at 25 C

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 = V

Rated Ampere hour capacity = Ah

Calculation of K T Factor :

NO

.

0

REVISIONS

BY:

BY:

BY:

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

DATE:

THIS DRAWING IS NOT

TO BE USED FOR

CONSTRUCTION OR

FOR ORDERING

MATERIALS UNTIL

CERTIFIED AND

DATED

5

OPRG DEPT

DATE:

ENG'G DEPT

DATE:

DRAWING TITLE

480

3.432

2 90 93.9 2.215

25.60 8.125

4 479 25.65

1.1

208

Sl.No T minute Total Ampere

TH

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JOB ORDER NO 20641055/00

DRAWN

DATE: 10/08/2008

DATE: 10/08/2008

CHECKED

Shabeer.A

K. Kandiah

8.109

CERTIFIED

KT Factor

REV NO.

0

DWG CONT SHT

SHEET NO.

11 of 13

DRAWING NO.

AG/ALS/E-342

AG/ALS/G-001

0.588

110V Battery & Battery charger Sizing Calculations

1 1 354

3 180 60.6

ANNEXURE-III

NO

.

0

REVISIONS

BY:

BY:

BY:

BY:

BY:

REINFORCEMENT OF Al Leith 33/13.8kV S/S

JEDDAH SAUDI ARABIA

DRAWING NO.

Load (A)change in

load (A)

Duration of

operation

(min)

REV NO.

0

20641055/00 DWG CONT SHT

SHEET NO.

12 of 13

AG/ALS/G-001

T = M1 = 1.0 0.5880 9.11

Total

time to end of

section (min)

1A1 =

15.50A1-0= 15.50 M1 = 1.0

period

DATE:

THIS DRAWING IS NOT

TO BE USED FOR

CONSTRUCTION OR

FOR ORDERING

MATERIALS UNTIL

CERTIFIED AND

DATED

110V Battery & Battery charger Sizing Calculations

DRAWING TITLE

T = M2+M3+M4 =

478.08.0920 -95.89

T = M3+M4=

389.0

JOB ORDER NO

AG/ALS/E-342

K. Kandiah

OPRG DEPT

DATE:

ENG'G DEPT

DATE:

CERTIFIED

DATE: 10/08/2008

DRAWN

DATE: 10/08/2008

110V

Battery

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M2 = 89.0

Require section size

(Ah)

+ve value -ve value

Section - 1 first period only

KT factor

M1 = 1.0 T =M1+M2 = 90 2.2150 34.33

T = M1+M2+M3 =

180.03.4320

9.11

Section - 2 first two periods only

1A1 =

15.50A1-0= 15.50

2A2 =

3.65

A2-A1=

-11.85

1A1 =

15.50A1-0= 15.50 M1 = 1.0 53.20

T = M2 = 89.0 2.1970 -26.03

SECTION - 1 to 5 (TOTAL) 107.85

T = M3

90.02.2150 6.383

A3 =

6.53

A3-A2=

2.88M3 = 90.0

Total 37.28

2A2 =

3.65

A2-A1=

-11.85M2 = 89.0

T = M2+M3 =

179.03.4190

2A2 =

3.65

A2-A1=

-11.85M2 = 89.0

-40.52

Total 8.30

Section - 3 first three periods only

Total 19.06

Section - 4 first four periods only

1A1 =

15.50A1-0= 15.50 M1= 1.0

T =

M1+M2+M3+M4 = 8.1080 125.67

34.10

Section - 5 first five periods only

3A3 =

6.53

A3-A2=

2.88M3 = 90.0

M4 = 299 T =M3

299.05.1090

125.94

6.6070 19.03

4A4 =

3.65

A4-A3= -

2.88-14.71

Total

1A1 =

15.50A1-0= 15.50 M1 = 1.0

T =

M1+M2+M3+M4 = 8.1250

19.08

2A2 =

3.65

A2-A1=

-11.85M2 = 89.0

T =

M2+M3+M4+M5 = 8.1080 -96.08

3A3 =

6.53

A3-A2=

2.88M3 = 90.0

T = M3+M4+M5=

3906.6240

3.10

4A4 =

3.65

A4-A3= -

2.88M4 = 299

T = M4+M5

3005.1230 -14.75

5A5 =

8.92

A5-A4=

5.27M5 = 1.0

T = t4

1.00000.5880

13 of 13