Technical Information

Calculating kVA & kW (Three Phase)

Formulae
Volts (V) = Voltage generated
Amps (I) = Amps available
P.F. Power factor of load (Usually 0.8)
v3 = 1.732

Formulae kVA = V x I x √3
  1000

Example 1

A 415 volt, 3 phase generator gives 200 Amp. Calculate the kW and kVA of the generator.

kW = V x I x P.F. x √3 15 x 200 x 0.8 x 1.732 = 115 kW
  1000 1000  
kVA = kW 115 = 143 kVA
  P.F. 0.8  

Example 2

What is the current available from a 150kVA generator at 415 Volts?

kW = V x I x √3 Therefore I = kVA x 1000 = 208 Amps
  1000 V x √3  

Example 3

If a customer requires a three phase current of 150 amps @ 440 volt, what size generator does he need?

kW = V x I x √3 440 x 150 x 1.732 =114kW
  1000 1000  

Note:- The calculations for kVA and kW current are the same at 50Hz or 60Hz.

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