Electrical Engineering ⇒ Topic : Leakage Reactance
In ideal transformer, we have assumed that all the flux linked with the primary winding also links with the secondary winding. For an actual transformer, the flux does not remain in magnetic core, i.e., all the flux linked with primary does not link with the secondary winding. As shown in Figure (a), a part of it, i.e., ΦL1 completes its magnetic circuit by passing through air. This is called primary leakage flux. The ΦL1 links only with primary turns and induces an e.m.f. eL1 in the primary winding. Similarly, secondary ampere turns (m.m.f.) sets up leakage flux ΦL2 which is linked with the secondary turns and induces an e.m.f. eL2.
figure (a) Leakage flux
The leakage flux in each winding produces a self-induced e.m.f. in that winding. In other words, we can say that it is equivalent to an inductive coil in series with each winding. It can also be said that a transformer with magnetic leakage is equivalent to an ideal transformer only if the leakage is depicted by equivalent inductive coils both in primary and secondary windings. This is shown in Figure (b).
figure (b) Winding reactance
In Figure (b), the parameters X1 and X2 represent leakage reactances of the primary and secondary windings
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