Transformer testing using circuit analysis techniques

A three-phase induction electric motor is a transformer with a rotating secondary. By understanding this fact, principles used for static motor circuit analysis (MCA) can be applied to transformers from standard control transformers to utility transmission and distribution transformers. The concept of MCA is to introduce alternating and direct current signals, at a very low power level, into the circuit, then amplify and present the results through a series of electrical bridges. The results of a utility transformer study and standard practices are discussed.