Question

A single phase 3kVA 480/240 V 50 Hz transformer has the following parameters: High voltage side:...

A single phase 3kVA 480/240 V 50 Hz transformer has the following parameters:

High voltage side: r1 = 0.25 Ω Xl1 = 0.75

Low voltage side: r2 = 0.05 Ω Xl2 = 0.18

a) Draw the equivalent circuit with quantities referred to the low voltage side;

b) Determine the voltage regulation when the transformer is supplying full load at 240 Vrms and 0.9 power factor lagging;

c) If the load terminals are accidentally short-circuited determine the currents in the high voltage and low voltage windings.

Neglect core losses

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