what is short circuit test of power transformer?

The short circuit test of a power transformer is a diagnostic procedure used to determine its impedance, losses, and efficiency under load conditions. During this test, the secondary winding is short-circuited while the primary winding is supplied with a reduced voltage, sufficient to produce rated current. This allows for the measurement of copper losses and helps assess the transformer’s performance without needing to operate at full voltage. The results are crucial for evaluating transformer efficiency and operational characteristics.