Battery Charger Calculation

TYPICAL, FOR INFORMATION ONLY

TYPICAL, FOR INFORMATION ONLY Doct no: GTEI/Fr-6 Typical-Bat Siz Rev: 00

BATTERY SIZING CALCULATION PROJECT

:-

Typical 1X Fr6 GTG

CUSTOMER

:-

Tender

CONSULTANT

:-

NA

SITE

:-

NA

APPLICATION

:-

Gas Turbine

TYPE OF BATTERY

:-

NI-CAD .

DC NOMINAL VOLTAGE :-

125V DC

FLOAT VOLTAGE

:-

1.4V/Cell

BOOST VOLTAGE

:-

1.6V/Cell

MIN AMBIENT TEMPERATURE:- 15 Deg C (for battery design) However, Battery sizing considered for worst condition of 5 Deg C MAXIMUM DC VOLTAGE :-

125 X 1.1

=

137.5V DC (+10%)

MINIMUM DC VOLTAGE :-

125 X 0.9

=

112.5V DC (-10%)

CELL END VOLTAGE

:-

1.14V/Cell .

NUMBER OF CELLS

:-

Maximum DC voltage / Float voltage per cell 137.5 / 1.40 = 98 Nos.

The type of battery is KPM, Pocket plated Ni-Cad

E:\RAKIA-UAE\battery-sizing\BATTERY & CHGR SIZ CALC-tender-Typical.doc

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The battery is sized for safe shutdown of gas turbine in the event of failure of AC supply.

TABLE – I DC LOAD DATA PER GAS TURBINE

Sl Tag No No

Loads in Description KW

Load current Starting for 10 secs

01

88QE-1

7.5

DC Emergency Lube Oil Pump Motor

106.67

66.67 Amps

02

88DS

7.5

DC Diesel Engine Starting Motor

106.67

66.67 Amps

03

88HR

0.56

DC Hydraulic Ratchet pump motor

8A

5 Amps

04

Lighting

0.2

Lighting in GT Acc. Compartment

2A

2A

05

TURBINE CONTROL PANEL (Mark-VI)

1.875

Turbine Control PANEL

15A

15 Amps

06

07

Emergency lighting 40 watts (12 numbers)

GT MCC (I/C )

08

GCP

09

GRP

10

AVR

11

Generator Emergency lighting

0.480

250 W

GT MCC (for incomers )

Generator 1.25KW Control Panel Generator 1.25KW Relay Panel Automatic 1.25KW Voltage regulator 0.25KW

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Refer duty cycle Refer duty cycle Refer duty cycle Refer duty cycle Refer duty cycle

5

5

Refer duty cycle

4

4

Refer duty cycle

10

10

Refer duty cycle -

10

10

Refer duty cycle

10

10

Refer duty cycle

2

Refer duty cycle

2


Load Load current current Remarks Normal Duration Requirement for coasting down and cool down Requirement for start-up Requirement for cool down Requirement for coasting down and cool down

The load requirement occurs when AC lighting fails. Considering 2A/ breaker & 2 breakers operating simultaneously.


DUTY CYCLE ON BATTERY IS AS FOLLOWS:

159.7A L O A D C U R R E N T

1Min 127.7A

Load cycle continues

119.7 A

2 Min

10 secs

15min

2hrs

TIME LOADS : A1: FIRST 10 secs (Considering Starting :Loads sl.no 1, 4, 5,7,8,9,10,11,12 of Table –I Current ) starting currents are considered 159.67 Amps A2: Next 14 Min , 50 secs

:

Loads sl.no 1,4 ,5,7,8,9,10,11,12 of

Table – I Normal currents are considered 119.67 Amps A3: Next 1 Min

:

Loads sl no.1,3,4 ,5,7,8,9,10,11,12 of table I are considered Starting currents for 88HR 127.67 Amps

A4: Next 2 Min

:

Load 1,4 ,5,7,8,9,10,11,12 Normal currents are considered 119.67 Amps.


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Section A3, A4 repeats sequentially for the next 105 Min (till the total duration of 2 hours) at the rate of 3min/cycle (1 min ON 2 min OFF and 35 such cycles occur in 105 Min. DUTY CYCLE : 1) 2) 3) 4)

159.7 Amps for 10 secs followed by 119.7 Amps for 14 min 50 secs followed by 127.7 Amps for 1 min followed by 119.7 Amps for 2 min.

3 & 4 repeats for remaining duty cycle time. FACTORS TO BE CONSIDERED: 1) Aging factor = 2) Design margin = 3) Temp correction factor = TABLE -1 Period

20% 10% For 5 deg C

Load ( In amps)

Duration

Performance factor (A/AH)

Temperature derating factor

as per vendor Datasheet-M/s HBL

( As per table01 of enclosed annexure-01)

Combined performance factor

I1= I2=

181.7

10 sec.

2.56 1.08

0.81 0.85

141.7

14 min 50 sec.

I3 = I4 =

149.7

1 min.

2.06

0.81

1.68

141.7

2 min.

1.88

0.82

1.53

2.06 0.92


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TABLE -2 Step .No.

Opening balance

Load in Amps

Duratio n

Combined Performan ce Factor

Ah Reqd.

Ah Drain

Ah Balan ce

1

0.00

159.7

2.06

77.37

2.662

2

74.71

119.7

10 sec 14 min 50 sec.

0.92

130.70

27.93

3

102.77

127.7

1 min.

76.14

2.13

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

100.64 96.65 94.52 90.53 88.40 84.41 82.29 78.30 76.17 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01

119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7 127.7 119.7

2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min. 1 min. 2 min.

78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33 76.14 78.33

3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990 2.13 3.990

74.71 102.7 7 100.6 4 96.65 94.52 90.53 88.40 84.41 82.29 78.30 76.17 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 74.01 74.34 Total

Min. capacity required :

1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53 1.68 1.53

196.71 Ah


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Ah to Add 77.37 55.988 0.00 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 2.163 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 1.797 4.322 196.71


Design margin of 10% : Aging factor of 20% : Cell selected :

216.38 Ah 259.65 Ah KPM 300P

THE BATTERY SELECTED IS 98 KPM 300P CHARGER SIZING CALCULATION BATTERY CAPACITY

: 125 VDC 300 AH Ni-Cd

TRICKLE CHARGING CURRENT @ 2 MILLIAMPS PER AH

: 1.1 A

CONTINUOUS LOAD CURRENT

:

45AMPS. (Loads no. 5 (15A), no 8 -(10A), no 9-(10A) no 10-

(10A)

(Float charge current= Continuous load + trickle current) THE CURRENT IN ON LINE FLOAT CHARGING

: 46.1

THE CURRENT REQUIREMENT FOR BOOST CHARGING

: 0.2 X 300 : 60A

Total charger rating

: 105 A

Charger rating selected

: 110 Amps

The charger selected is 2 X 100% Float cum boost charger 125VDC, 110 A


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Battery Charger Calculation

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