Influence of capacitive no-load current component in large power transformers

In this paper the presence of capacitive component of large power transformer no-load current is presented when powered by 50 Hz sinusoidal voltage. Capacitive component exist mainly as sum of the capacitive component of supplied windings and transferred currents from other windings [2], [3] Its influence on the no-load characteristic and an approach for determination of the inductive component in the no-load current based on the no-load current measurement is explained. Equivalent capacitance is compared with capacitance measurements in test field.