Electronics and Communication Engineering

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Single Phase Transformers INTRODUCTION This chapter has been divided into following topics 1) Working Principle of Transformer 2) E.M.F. Equation of transformer 3) Transformer on NO load and ON load (with phasor diagram) 4) Equivalent circuit of transformer 5) Transformer Tests (O.C. and S.C. Test) 6) Losses in transformer and its efficiency 7) All day efficiency WORKING PRINCIPLE OF TRANSFORMER 1) The transformer is a static piece of device by means of which an electric power is transformed from one circuit to another circuit without change in the frequency. 2) A transformer operates on the principle of mutual inductance between two inductively coupled coils. The winding in which electrical energy is fed is called Primary winding and the other from which energy is drawn out is called Secondary winding.

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