A 11 kV 100 MVA alternator is grounded through a resistance of 4 Ω. T – McqOptions

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1.	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?
A.	93.7
B.	6.3
C.	87.4
D.	84.5
Answer» D. 84.5

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