Power Transformer Calculations

Discussion in 'Homework Help' started by notoriusjt2, Apr 11, 2011.

  1. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
    209
    0
    A three phase Delta - Wye connected transformer supplies 5000KVA at 100% power factor. Taps are set at 69 - 12.47kv. Calculate the following...

    1.)Transformer turns ratio phase to ground.

    12.47KV phase to phase = 7208V phase to ground
    69000V / 7208V = 9.57
    so the turns ratio is 9.57 to 1

    2.)Secondary Line current
    5000KVA = 12470V * I * 1.73
    I = 231.77A

    3.)Primary Line current
    5000KVA = 69000V * I * 1.73
    I = 41.89A

    Are these calculations correct?
     
  2. subtech

    Senior Member

    Nov 21, 2006
    123
    4
    Yes, your calculations are correct.
     
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