Electrical Engineering ⇒ Topic : Transformer with Resistance and Leakage Reactance

TRANSFORMER WITH RESISTANCE AND LEAKAGE REACTANCE

The primary and secondary windings of a transformer with resistance and reactance is shown in Figure (a).

The primary impedance is given by

                                Figure (a) Equivalent circuit of a practical transformer

The secondary impedance is given by

Here the resistance and leakage reactance in each winding is responsible for some voltage drop in each winding. In primary, there are I₁R₁ and I₂X₂ drop. Hence

                                                            ............. (1)

Similarly, for secondary winding, we get

                                                          .............. (2)

The complete phasor diagram of the transformer at unit p.f. (resistive load), lagging pf. (inductive load), and leading p.f. (capacitive load) at the secondary are shown in Figure 1 (a), 1(b), and 1(c), respectively

                          Figure (1) Phasor diagram of a transformer on load.

TRANSFORMER WITH RESISTANCE AND LEAKAGE REACTANCE

The primary and secondary windings of a transformer with resistance and reactance is shown in Figure (a).

The primary impedance is given by

                                Figure (a) Equivalent circuit of a practical transformer

The secondary impedance is given by

Here the resistance and leakage reactance in each winding is responsible for some voltage drop in each winding. In primary, there are I₁R₁ and I₂X₂ drop. Hence

                                                            ............. (1)

Similarly, for secondary winding, we get

                                                          .............. (2)

The complete phasor diagram of the transformer at unit p.f. (resistive load), lagging pf. (inductive load), and leading p.f. (capacitive load) at the secondary are shown in Figure 1 (a), 1(b), and 1(c), respectively

                          Figure (1) Phasor diagram of a transformer on load.