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Shady data from a transformer’s short-circuit test

  1. Apr 24, 2015 #1
    1. The problem statement, all variables and given/known data
    Data from the short-circuit test of a 60-Hz, 100-kVA, 4600–230-V transformer are:

    VSC = 172.3 V
    ISC = 20.2 A
    PSC = 1046 W

    Get the per-unit parameters.

    2. Relevant equations

    ISC ≠ Irated, so how will I solve the problem?

    The problem is from the book with ISBN 0130612103.
    Last edited: Apr 24, 2015
  2. jcsd
  3. Apr 24, 2015 #2


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    Gold Member

    Rated current is about 100 kVA / 4.6 kV = 21.7 A, so the error-ratio is 21.7 A / 20.2 A = 1.076

    So you multiply Vsc and Isc by 1.076.

    Multiply Psc by 1.0762. ( P = R * I2. )
  4. Apr 24, 2015 #3
    The per-unit parameters are the same whether or not I multiplied the data by 1.076 or 1.0762.
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