Question

A single phase
30 KVA 200/2000 V Transformer gives the following details:

OC Test: 200V, 6.2A, 360W on LV side (H.V. side is open) and SC Test: 75V, 18A, 600W on HV side

(L.V. side is shorted).

Obtain the approximate equivalent circuit parameters referred to Primary Side. Find also the Full Load

Efficiency at unity power factor load.​

Answer 1

Answer:

A 20-kVA 8000/480- V distribution transformer has the following resistances and reactances: R_p = -32 Ohm R_s = 0.05 Ohm X_P = 45 Ohm R_s = 0.06 Ohm R_c = 250 k Ohm X_M = 30 Ohm The excitation branch impedances are given referred to the high-volt age side of the transformer.