During the SC (Short circuit) test the Power Input to a transformer comprises predominately

During the SC (Short circuit) test the Power Input to a transformer comprises predominately

SOLUTION

During the SC (Short circuit) test the Power Input to a transformer comprises predominately Copper loss.

Short circuit test or Impedance test is performed to determine

Copper loss at full load
⇒ Equivalent impedance (Zo1 or Zo2)
⇒ Leakage reactance (Xo1 or Xo2)

  • The figure shows the circuit diagram for conducting the short-circuit test on a transformer. One of the windings of the transformer is short-circuited through an ammeter, while a low voltage is applied to the other winding.
  • The applied voltage is slowly increased until full load current flows in this winding. The full load current will then flow in the other winding also.
  • Normally the applied voltage is hardly 5 to 7 percent of the rated voltage of this winding. As such the flux established in the core will be quite small and so the iron losses occurring under this condition are negligible.
  • Thus, the reading indicated by the wattmeter connected in the circuit gives the full load copper losses of the transformer.
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