Correct option is C
Percentage of Winding protected =100 - Percentage of Winding unprotected
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Question
A 11 kV 100 MVA alternator is grounded through a resistance of 4 Ω The C.T.s have a ratio of 500/5. The relay is set to operate when there is an out of balance current of 2 A. What percentage of generator winding will be protected by the percentage differential protection scheme?
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