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3 Phase formulae

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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

 

 

 

 

Legend

AC = Alternating Current

DC Direct Current

 

 

E = Volts

Elf = Volts

 

 

Elf = Efficiency

H.P. = Horse Power

 

 

I = Current (Amps)

kVA = Kilovolt Amps

 

 

kW = Kilowatts

P.F = Power Factor

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Last modified: April 17, 2010