The primary and secondary windings of a 40 kVA, 6600/250 V single-phase two-winding transformer have resistances of 10 Ω and 0.02 Ω, respectively. The leakage reactance of the transformer referred to the primary is 35 Ω.  Calculate the percent full-load regulation at unity power-factor. Neglect the no-load current

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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.