A 23 kVA, 2300/230 V, 60 Hz, step-down transformer has the following resistances and reactances:  R1=4Ω, R2=0.04Ω, X1= 12Ω, X2 =0.12Ω, RC1=20 kΩ and XM1 = 15kΩ  The transformer is operating at 75% of rated load. If the power factor is 0.866 leading, determine the efficiency of the transformer using the approximate circuit referred to the primary side. Also sketch its phasor diagram.

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Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.