A star-connected, 3-phase, 10-MVA, 6.6 kV alternator has a per phase reactance of 15%. It is protected by Merz-Price circulating-current principle which is set to operate for fault currents not less than 190 A. Calculate the value of earthing resistance to be provided in order to ensure that 85% of the alternator winding is protected.

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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.