110v battery sizing

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BY

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###

NO

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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

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TABLE OF CONTENTS

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Page

1 - 110V Battery Bank Sizing Calculations 3

2 - 110V Battery Charger Sizing Calculations 10

BY

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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:





THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OR

FOR ORDERING MATERIALS UNTIL

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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

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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

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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

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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

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Unit Load (Watt)

Total Load (Watt)



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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

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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

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DATE:





Unit Load (Watt )

Total Load (Watt )



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2.5 EMERGENCY LOAD

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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

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DATE:





Emergency Lighting load for 1.5 hours is considered as 360W ( 2.88A ) maximum number

Ah



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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

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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:

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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

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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:

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ANNEXURE - 1

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AM

PE

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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:







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B. 110V BATTERY CHARGER SIZING CALCULATIONS

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V B

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Siz

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Su

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pp

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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

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### Subsitituting the above values in Equ - 1

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

NO

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### ###

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:





AR

AR



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ANNEXURE -II

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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

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### 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:





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



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ANNEXURE-III

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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:





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



CERTIFIED AND DATED

13 of 13

110v battery sizing

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