This lesson covers the concept of the equivalent circuit of a transformer. It explains the primary and secondary sides of the circuit, the resistance and reactance of the primary and secondary windings, and the core loss. The lesson also discusses the magnetizing branch of reactance and the reflected resistance of the secondary side. It further elaborates on the load impedance connected to the secondary side of the transformer. The lesson also introduces the concept of an ideal transformer and how to derive its equivalent circuit. Towards the end, it discusses the approximate equivalent circuit and the phasor diagram of the exact transformer.

The equivalent circuit of a transformer consists of the primary and secondary sides, the resistance and reactance of the primary and secondary windings, and the core loss.

The ideal transformer is derived by making the resistance and reactance of the primary and secondary windings zero and the core loss and magnetizing branch of reactance infinity.

The approximate equivalent circuit is derived by neglecting the small resistance and reactance of the primary and secondary windings compared to the core loss and magnetizing branch of reactance.

The phasor diagram of the exact transformer can be drawn if the voltage is known.

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