DG Sizing Calculation for 1 x 70 MW Unit

Table -1: Load List

Description Type of Load Rated Power (kW) Quantity Efficiency

O/G Feeder Emergency Lighting F 36.0 1 36 UPS F 59.5 1 59.5Battery Charger F 100.0 1 100Chimney F 0.16 1 0.16Elevator F 0.16 1 0.16Motor FeederBFP Lube Oil Pump M 15.0 1 13.5 0.8 16.88Air Pre Heaters MAuxiliary Oil Pump M 80.0 1 72 0.88 81.82Jacking Oil Pump M 18.5 1 16.65 0.8 20.81

Total Load 315.33Adding 10% margin 346.86

Total kW requirement ( base load) = 315.33 kW

= 346.86 kW

Alternator Size = 433.57 kVA

Minimum diesel engine output required = 365.11 kW (Generator Eff. 0.95)

= 207.91 kW

= 441.42 kW

= 464.65 kW

Selected Diesel engine size = 470 kW

Selected Alternator Size = 500 kVA

Shaft Power Demand(kW)

Input Power of Individual Load ( kW)

Active Power Requirement ( considering 10% margin)

Active power requirement during to largest motor starting

( starting current =6 times + 20% margin) & starting power factor = 0.3

Active power requirement during largest motor starting at base load

Diesel engine output required during largest motor starting

DG Sizing Calculation for 2 x 35 MW Unit

Table -1: Load List

Description Quantity Efficiency

O/G Feeder Emergency Lighting F 36.0 1 36 UPS F 59.5 1 59.5Battery Charger F 85.0 1 85Chimney F 0.16 1 0.16Elevator F 0.16 1 0.16Motor FeederBFP Lube Oil Pump M 15.0 1 13.5 0.8 16.88Auxiliary Oil Pump M 40.0 2 36 0.88 81.82Jacking Oil Pump M 18.5 1 16.65 0.8 20.81

Total Load 283.45Adding 10% margin 311.80

Total kW requirement ( base load) = 283.45 kW

= 311.80 kW

Alternator Size = 389.74 kVA

Minimum diesel engine output required = 328.21 kW (Generator Eff. 0.95)

= 88.36 kW

= 290.00 kW

= 305.26 kW

Selected Diesel engine size = 350 kW

Selected Alternator Size = 400 kVA

Type of Load

Rated Power (kW)

Shaft Power Demand(kW)

Input Power of Individual Load ( kW)

Active Power Requirement ( considering 10% margin)

Active power requirement during to largest motor starting

( starting current =6 times + 20% margin) & starting power factor = 0.3

Active power requirement during largest motor starting at base load

Diesel engine output required during largest motor starting