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Three Phase Load

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Calculating kVA and kW (Three Phase)

Formula:        kVA = V x I x √3 1000

Where:   V = Volts generated

            I = Amps available

            P.F. - Power factor of load (Usually 0.8) √3 = 1.732

Example 1

A 415 volt, three phase generator provides 200 Amp. Calculate the kW and kVA of this generator.

kW  = V x I P.F. x 1000      =   415 x 200 x 0.8 x 1.732 1000 = 115 kW

kVA  =   kW P.F.                     = 115 0.8                               = 143 kVA

Example 2

To calculate the current (Amps) available from a 150 kVA generator at 415 Volts

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

Example 3

To calculate the size of a generator required to provide 150 Amps @ 440 Volt

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

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Last modified: April 17, 2010