4. [Transformer - 15 points) A 50-kVA, 13,800/208-V, A-Y distribution transformer has an equivalent resistance of...

Question:

4. [Transformer - 15 points) A 50-kVA, 13,800/208-V, A-Y distribution transformer has an equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation at full load and 0.9 PF leading.

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