The following results are obtained on a 40 K.V.A, 2400/120 V transformers - OC test: 120 V, 9.65 A and 396 W (L.V side) - SC test: 92V, 20.8A and 810W (H.V side) - Calculate the parameters of approximate equivalent circuit referred to H.V. side -

Equivalent circuit constants

From OC test (meters are connected on L.V. side, i.e. secondary)

Given: W1= 396W

V2= 120 V

I0= 9.05 A

$\cos ф0 = Wi/ V2 * I10 \\ = 396/ 120 * 9.65 = 0.34 \\ ∴ \cos ф10 = 0.34 \\ ∴ \sin ф0 = \sin …