solve The two windings of a 2400/240-volt, 48-KVA, 60-Hz transformer have resist

Question

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The two windings of a 2400/240-volt, 48-KVA, 60-Hz transformer have resistances of 0.6 and 0.025 ohm for the high- and low-voltage windings, respectively. This transformer requires that 238 volts be impressed on the high-voltage coil in order that rated current be circulated in the short-circuited low-voltage winding. Calculate the equivalent leakage reactance referred to the high side. How much power is needed to circulate rated circulate on short circuit? Compute the efficiency at full-load when the power factor is 0.8 lagging. Assume that the core loss equals the copper loss.

Explanation / Answer

a) answer is 118.9 ohms

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