DG Sizing Calculation

DG Sizing Calculation for 1 x 70 MW Unit Table -1: Load List

Desc Descri ript ptio ion n

Quan Quanti tity ty

Shaft Power Demand(kW)

Efficiency

Input Power of Individual Load ( kW)

Type Type of Load Load

Rate Rated d Powe Powerr (kW) (kW)

Emergency Lighting

F

36.0

1

36

 UPS

F

59.5

1

59.5

Battery Charger

F

100.0

1

1 00

Chimney

F

0.16

1

0.16

Elevator

F

0.16

1

0.16

BFP Lube Oil Pump

M

15.0

1

13.5

0 .8

16.88

Air Pre Heaters

M

Auxiliary Oil Pump

M

80.0

1

72

0.88

81.82

Jacking Oil Pump

M

18.5

1

16.65

0.8

20.81 315.33 346.86

O/G Feeder

Motor Feeder

Total Load Adding 10% margin =

315.33

kW

=

346.86

kW

Alternator Size

=

433.57

kVA

Minimum diesel engine output required

=

365.11

kW

=

207.91

kW

Total kW requirement ( base load) Active Power Requirement ( considering 10% margin)

Active power requirement during to largest motor starting

Active power requirement during largest

( starting current =6 times +

441.42

kW

=

464.65

kW

Selected Diesel engine size

=

470

kW

Selected Alternator Size

=

500

kVA

Diesel engine output required during largest motor starting

20% margin) & starting power factor = 0.3

=

motor starting at base load

(Generator Eff. 0.95)

DG Sizing Calculation for 2 x 35 MW Unit Table -1: Load List Type of Load

Rated Power (kW)

Emergency Lighting

F

36.0

1

36

 UPS

F

59.5

1

59.5

Battery Charger

F

85.0

1

85

Chimney

F

0.16

1

0.16

Elevator

F

0.16

1

0.16

BFP Lube Oil Pump

M

15.0

1

13.5

0.8

16.88

Auxiliary Oil Pump

M

40.0

2

36

0.88

81.82

Jacking Oil Pump

M

18.5

1

16.65

Description

Quantity

Shaft Power Demand(kW)

Efficiency

Input Power of Individual Load ( kW)

O/G Feeder

Motor Feeder

0.8 Total Load Adding 10% margin

=

283.45

kW

=

311.80

kW

Alternator Size

=

389.74

kVA

Minimum diesel engine output required

=

328.21

kW

=

88.36

kW

Total kW requirement ( base load) Active Power Requirement ( considering 10% margin)

Active power requirement during to largest motor starting

Active power requirement during largest

kW

=

305.26

kW

Selected Diesel engine size

=

350

kW

Selected Alternator Size

=

400

kVA

motor starting

20% margin) & starting power factor = 0.3

290.00

Diesel engine output required during largest

(Generator Eff. 0.95)

( starting current =6 times +

=

motor starting at base load

20.81 283.45 311.80