NGR in Transformer / Generator Protection

How to calculate the NGR resistance to connect in alternator / transformer. I mean to say thumb rule of NGR against MW capacity of alternator / transformer.

Interview Candidate
Apr 21st, 2016
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Electrical Engineering

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Aadil

Jul 1st, 2016

NGR or Neutral Grounding Resistors are used to limit the ground fault current to a safe value in the event of earth fault. A NGR limits the earth fault current to a value which will be sufficient to operate protective relays and prevent unwanted fault damage.