A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to one or more circuits. A varying current in any one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force across any other coils wound around the same core.


Transformer is a static electrical machine that is considered to be a backbone of a power system.

For generation, transmission and distribution of electric power, AC system is adopted instead of DC system because voltage level can be changed comfortably by using a transformer. For economic reasons, high voltages are required for transmission whereas, for safety reasons, low voltages are required for utilisation. Transformer is an essential part of power system. Hence, it is rightly said that transformer is a backbone of a power system.

In this page, we shall discuss the general features and principle of operation of single-phase transformers and three phase transformers.

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