Definition of Leakage Inductance
The magnetic flux linked to both the primary winding and the secondary winding is said to be the main flux, (φ12 or φ21). The magnetic flux which interlinks only with the primary winding, and does not interlink with the secondary winding, is said to be the primary leakage flux, φσ1. The magnetic flux which interlinks with the secondary winding, and does not interlink with the primary winding is said to be the secondary leakage flux, φσ2. The primary side leakage flux becomes the primary side leakage inductance, and the secondary side leakage flux becomes the secondary side leakage inductance. Defining k to be the coupling coefficient, and denoting the leakage inductances of the primary side and the secondary side as Le1 and Le2 respectively, it follows that:
If one winding of a transformer which has two windings is short-circuited, the inductance measured from the other winding is the leakage inductance. It is also called short-circuited inductance. Denoting the leakage inductances of the primary and secondary sides as Lsc1 and Lsc2 respectively, it follows that:
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