A 4.6-kVA, 308 / 155 -volt distribution transformer has the following equivalent resistance and leakage-reactance values referred to the primary: rep = 1.5 ohm; xep = 7.5 ohms. The core losses of this transformer amount to 500 watts. If this transformer is operating at full-load unity power factor, what is its percent efficiency?

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A:

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A:

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Q: draw a three-phase transformer equivalent circuit and also explain how formulas were derived

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A: The given data is shown below:

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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.