TRANSFORMER WITH RESISTANCE AND LEAKAGE REACTANCE

Figure 1.30 shows a transformer having resistances R₁ and R₂ of primary and secondary windings respectively, and leakage reactances X₁ and X₂ of primary and secondary windings respectively. The primary impedance is given by

and the secondary impedance is given by

The applied voltage V₁ on primary side is given by

If V₂ be the secondary terminal voltage during load, the secondary induced emf (E₂) is given by

Figure 1.31 shows the phasor diagram of the transformer for unity power factor, lagging power factor and leading power factor respectively.

Figure 1.30 Transformer with Resistance and Leakage Reactance

Figure 1.31 Phasor Diagram of a Transformer at Load