Effect of Load Switching on Induced e.m.f. of a Transformer

In this proposed work, a mathematical model of transformer has been implemented using Simulink environment to investigate the effect of load switching on the induced e.m.f. due to the presence of leakage inductances of the windings. Estimation of the parameters on a laboratory single-phase transformer has been carried out through Open Circuit (O.C.) and Short Circuit (S.C.) tests and the transient equation for no-load current has been established. This experimental work defines the switching effect of resistive, resistive-inductive (RL) along with a power factor improvement capacitor introduced in parallel with RL load. It has been found in presence of capacitor, the inductive voltage spikes is minimized because of reactive power injection to the system.