Transformer with Resistance and Leakage Reactance |

## What do you mean by the Transformer Resistance and Leakage Rcctance?

**The Transformer resistance**means the resistance of the primary and secondary winding of the transformer.

**Transformer Leakage Reactance**means there is some magnetic leaking in both of the primary and secondary windings that should be equal to inductive coils connected in both primary & secondary windings.

In the figure above, the primary and secondary windings of a transformer with reactances taken out of the windings are shown.

The primary impedance is given by

**Z**R _{1}= sqr(_{1}

^{2}+X

_{1}

^{2})

Similarly, secondary impedance is given by

**Z**R _{2}= sqr(_{2}

^{2}+X

_{2}

^{2})

The resistance and leakage reactance of each winding are responsible for some voltage drop in each winding.

In the primary, the leakage reactance drop is I

_{1}X_{1}(usually 1 or 2% of V_{1}).Hence,

**V**R +jX ) =E_{1}= E_{1}+ I_{1}(_{1}

_{1}

_{1}+I_{1}Z_{1}Similarly, there are I

_{2}R

_{2}and I

_{2}X

_{2}drops in secondary which combine with V

_{2}to give E

_{2}.

**E2 = V2 + I**R2 +jX2 ) =V

_{2}(_{2}+ I_{2}Z_{2}It may be noted that leakage reactances can also be transferred from one winding to the other in the same way as resistance.

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