What is OC and SC test of transformer ?

Question

Accepted Answer

OC and SC tests are conducted on transformers to determine their efficiency and performance under different load conditions.

OC test (Open Circuit test) is conducted to determine the no-load loss and magnetizing impedance of the transformer.
SC test (Short Circuit test) is conducted to determine the full-load copper loss and equivalent resistance of the transformer.
Both tests help in evaluating the efficiency and voltage regulation of the transformer.
Results from these tests are used to calculate the efficiency, voltage regulation, and other performance parameters of the transformer.
OC test involves applying rated voltage at rated frequency with secondary winding open, while SC test involves applying rated current at rated frequency with primary winding shorted.

Top East India Udyog Senior Electrical Engineer interview questions & answers