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Discuss Calculating 3 phase kva in the Industrial Electrician Talk area at

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  1. nickblake

    nickblake Trusted Advisor

    My brains switched off chaps and i can remember how to calculate 3 phase kva

    i know its V x I x 1.73 / 1000

    so is it 230 or 400 x I x 1.73 / 1000

    fee a right numpty cant belive ive forgotten it not done 3 phase calcs for a while please enlighten me to the correct figures then ill give my self a good slapping:D
  2. ezzzekiel

    ezzzekiel Guest

    P=1.732 X vl X iL X PF
  3. ukpablo

    ukpablo Regular EF Member

    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
  4. pushrod

    pushrod Electrician's Arms

    VA = √3 x Vl xIl

    since VA = watts/PF

    edit and it will be 400V
    Last edited: Jan 18, 2011
  5. nickblake

    nickblake Trusted Advisor

    Thanks guys the pennys dropped im in the process of giving myself a slap ,im a right bleary eyed parrot faced wassok duuuuuu
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