1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    Hesch

    User Avatar
    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Shady data from a transformer’s short-circuit test
Loading...