Short circuit test transformers

Discussion in 'Homework Help' started by nyasha, Dec 18, 2011.

  1. nyasha

    Thread Starter Active Member

    Mar 23, 2009
    Why is the short circuit test on a transformer done at the high voltage side ? Is this not to damage with transformer by having lots of current flowing through it ?
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    On a short circuit test one doesn't apply the rated terminal voltage to the other winding. Normally a variable voltage controller (such as an induction regulator) is interposed between the excited winding and the AC supply with the initial setting at zero volts. The excitation voltage is then carefully increased while the short circuit current is monitored up to the rated current, at which point the various parameters are measured.
    Last edited: Dec 18, 2011
  3. jegues

    Well-Known Member

    Sep 13, 2010
    The SCT is preformed on the high voltage side because the rated current on the HV side is lower. (The SCT must be preformed at rated current)

    Since we have to apply a source to provide this excitation current, wouldn't you rather it be a smaller current as opposed to a larger one?

    It is much easier to find a source that can supply a smaller current, as opposed to a larger one.