Question

A 2000/200 V 1 phase two winding transformer having the % impedance is 8%. Now it is connected as auto transformer for stepping up the voltage from 2000 t0 2200V. Find the % impedance of Auto transformer

Answer 1

Answer:

Short circuit test is used to find out copper or ohmic losses in a transformer. In short circuit test rated current flows in the winding whereas applied voltage is 2% – 12% of rated value. As core losses ∝ (voltage)2.