Generator Formulae (Three Phase Generators)

To Find

Known Values

3 Phase

kW

Volts, Current, P.F.

E x I x 1.732 x P.F.÷1000  =  kVA x PF

kVA

Volts, Current

E x I x 1732 ÷ 1000  =  KW ÷ P.F.

kW

Motor HP, Elf

HP  x  .746  ÷  Efficiency

(Req. for motor)

kVA

Motor HP, Elf, P.F.

HP  x  .746  ÷  Elf  x  P.F.

(Req. for motor)

Amperes

HP, Volts

HP  x  .746  ÷  1.732  x  E  x  Elf  x  P.F.

Amperes

kW, Volts, P.F.

kW  x  1000  ÷  1.732  x E  x  Elf  x  P.F.

Amperes

kVA, Volts

kVA  x  1000  ÷  E  x  1.732

Single-Phase Generators (and DC)

To Find

Direct Current

Single Phase

Amperes

kW  x  1000  ÷  E

KW x 1000  ÷  E  x  P.F.

(kW is known)

Amperes

kVA  x  1000  ÷  E

(kVA is known)

Kilowatts

I  x  E  ÷  1000

kVA  x  1000  ÷  E

kVA

I  x  E  ÷  1000

Power Factor

K  ÷  VA  or   kW  ÷  kVA