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Homework Help: : single phase transformer

  1. Dec 14, 2007 #1
    urgent : single phase transformer

    1. The problem statement, all variables and given/known data

    A 2200/220 V, 500kVA, 50Hz distribytion transformer has been tested by means of the open circuit. the test data obtained is as follow:
    open circuit test: V(l)= 220V, I(l)= 85A, P(oc)= 1800W
    short circuit test V(h)=95V, I(h)=227.3A P(sc)= 8.2kW

    2. Relevant question

    1.equivalent resistance referred to the low voltage side (state all assumption)

    2. resistance of the low side winding only

    3.transformer copper loss of the secondary winding during the open circuit test

    4. transformer core loss when rated voltage is applied

    5. explain if it justified to use the power input during the open circuit test as core loss?

    3. The attempt at a solution
  2. jcsd
  3. Dec 27, 2007 #2
    It is so clear that you want us to do your homework. Here is a hint. OC tests are used to find parameters on the primary side, and SC tests are for the secondary side. Once you find out your core loss, you can assume it to be a constant and not varying with load. Only the Cu losses will change with load.
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