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The parameters of the equivalent circuit of a 150-kVA,2400/240V transformer are: R1=0.2ohm, R2=2 x 10- ohm, X1=0.45 ohm, X2= 4.5 x 10- ohm, -3

The parameters of the equivalent circuit of a 150-kVA,2400/240V transformer are: R1=0.2ohm, R2=2 x 10- ohm, X1=0.45 ohm, X2= 4.5 x 10- ohm, -3 Ri=10 kohm, Xm = 1.6 kohm as seen from 2400 volts side. Calculate: (i) open circuit current, power and PF when LV side is excited at rated voltage.(8) (ii) The voltage at which the HV side should be excited to conduct a short-circuit test (LV side) with full-load current flowing. What is the input power and its power factor? (8)

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