leakage magnetic flux

Transformer magnetic flux that does not contribute to the voltage transformation among the flux generated in a transformer. The flux that links both the primary winding and the secondary winding and contributes to voltage transformation is called the main flux. There are primary leakage flux, which links only the primary winding, and secondary leakage flux, which links only the secondary winding. Leakage flux forms leakage reactance and is represented by an equivalent circuit in which reactance is connected in series on both the primary and secondary sides of the transformer. Leakage flux generates stray load loss due to eddy currents, so a smaller amount is desirable.