Transformer KVA calculation

Discussion in 'General Electronics Chat' started by hurtman, Aug 6, 2009.

  1. hurtman

    Thread Starter New Member

    Aug 6, 2009
    I've got a three phase generator rated at 70 kva. It's output is going to 3 single phase step up transformers. Each single phase transformer is rated at 22 kva. Would I be exceeding the rating of the transformers if the generator was above 66 kva (3 22 kva transformers)? Or since the three single phase transformers are being used for three phase do you get to multiply the single phase kva rating by the square root of 3 to get a higher kva rating?

    Thanks in advance for the help.

  2. mik3

    Senior Member

    Feb 4, 2008
    It doesn't matter if the generator can provide more than 70 KVA. The thing that matters is the power drawn from each transformer. This power must be equal or less than 22 KVA in your case.