What is the SC (short circuit) test for a transformer?

The SC test of a transformer, also known as the short circuit test, is a critical diagnostic procedure used to evaluate the transformer’s performance under load conditions. During this test, the low-voltage side of the transformer is short-circuited while a specified voltage is applied to the high-voltage side, allowing for the measurement of the short circuit current and the assessment of the transformer’s impedance. This helps determine losses, efficiency, and potential heating issues that may arise during normal operation. Conducting the SC test provides valuable insights into the transformer’s characteristics and overall reliability, which is essential for maintenance programs.