) A 500 kVA single-phase transformer A with percentage impedance of 0.010 + j0.05 is connected in parallel with a 250 kVA transformer B with a percentage impedance of 0.015 + j0.04. If the transformers are serving a single-phase load rated 800 kVA, 80% lagging pf, determine the (a) kVA delivered and (b) operating pf of each transformer. Assume that the transformers have the same turns ratio. Subject Electrical

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A:

Q: equivalent winding (a) resistance,(b) reactance and (c) impedance referred to the high voltage side.

A:

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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.