Short-circuit test is performed on a transformer with a

Home » Electrical Machines » Electrical machines miscellaneous » Question

Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage, but at a frequency higher than the rated frequency, then

1. the magnitude of current and power factor will both increase
2. the magnitude of current will decrease but the power factor will increase
3. the magnitude of current will increase, but power factor will decrease
4. the magnitude of current as well as the power factor will decrease.

Correct Option: D

Since frequency has been increased, the leakage reactance and hence impedance will increase. Thus current will be less and power factor will be poorer.