Electrical Engineering Glossary Definition for Leakage Inductance

Definition

Leakage inductance in a transformer is an inductive component that results from the imperfect magnetic linking of one winding to another.

In an ideal transformer, 100% of the energy is magnetically coupled from the primary to the secondary windings. Imperfect coupling causes some loss. The electrical equivalent is some self-inductance in series with the primary windings that are properly coupled. This series inductance is the "leakage inductance."

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