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The neutral point of 25MVA, 11kW alternator is grounded through a resistance of 5Ω, the relay...

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Electrical Engineering

The neutral point of 25MVA, 11kW alternator isgrounded through a resistance of 5Ω, the relay is set of operatewhen there is an out of balance current of 2A. The CTs used have aratio of 1000/5. Calculate (neglect resistance ofalternator):
i. The percentage of stator winding protected against earthfault.
ii. The minimum value of earthing resistance to protect 95% of thewinding.

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