Leakage flux

Magnetic flux generated in a transformer that is not related to the voltage transformation effect. The magnetic flux that intersects both the primary and secondary windings and contributes to voltage transformation is called the main flux. There are primary leakage flux, which intersects only the primary winding, and secondary leakage flux, which intersects only the secondary winding. Leakage flux forms leakage reactance and is represented in the equivalent circuit as a series connection of reactance on both the primary and secondary sides of the transformer. Leakage flux causes stray load loss due to eddy currents, so smaller leakage flux is desirable.

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