Leakage Reactance of Transformer

Leakage Reactance or Inductance of Transformer

In this article we are discuss about leakage reactance  or inductance of transformer.
We know that in an ideal transformer flux leakage is zero but practically it is not possible, Actually in practice it is found that all the flux does not link with primary and secondary winding. It is divided into three parts.

Leakage Reactance of Transformer
Leakage Reactance of Transformer - Image Source

1. Main or mutual flux

It links with both primary and secondary winding and induces EMF in both.

2. Primary leakage flux

These are primary leakage flux which link with primary winding only. It completes its path through air. It is proportional to primary turn and in phase of primary current. It induces an EMF in primary winding. Due to this leakage flux there is a voltage drop in primary winding. The primary reactance is given by:

Primary Reactance = Primary Leakage EMF / Primary Current


3. Secondary leakage flux

Similarly, these are secondary leakage flux which link with secondary winding only. It completes its path through air. It is proportional to secondary turn and in phase of secondary current. It induces an EMF in secondary winding. Due to this leakage flux there is a voltage drop in secondary winding. The secondary reactance is given by:

Secondary Reactance = Secondary Leakage EMF / Secondary Current



Leakage reactance is losses of transformer, it reduces efficiency of transformer and increase voltage regulation of transformer which become cause of low efficiency.
so this type working completed of leakage reactance or reluctance of transformer.

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