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Transformer Operations

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The primary and secondary windings of a transformer are wound on a common magnetic core. The alternating flux generated by the primary winding is therefore coupled into the secondary winding and very little flux is allowed to escape from the magnetic circuit.

A sinusoidal current flowing in the primary winding produces a sinusoidal flux. At any instant the flux in the transformer is given by the equation:

Φ = Φ_max sin(2πft)

where Φ_max is the maximum value of flux (in Wb), f is the frequency of the applied current (in Hz), and t is the time in seconds.

The r.m.s. value of the primary voltage (VP) is given by:

V_P = 4.44 f N_P Φ_max

Similarly, the r.m.s. value of the secondary voltage (VS) is given by:

V_S = 4.44 f N_S Φ_max

<^< Transformers | Course index | Examples: Transformer Operations >^>