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Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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(Q.4) A 11 kV, 30 MVA alternator is protected by a circulating current protection scheme. The generator neutral is grounded through a resistance of 10 2. The protective relay is set to operate for an out of balance current, which is 0.5% of the rated alternator current. Turns ratio of the neutral CT is 200/5. Determine- (i) The percentage of winding that remains unprotected. (ii) The maximum value of the earthing resistance required to protect 75% of the winding.
Transcribed Image Text:(Q.4) A 11 kV, 30 MVA alternator is protected by a circulating current protection scheme. The generator neutral is grounded through a resistance of 10 2. The protective relay is set to operate for an out of balance current, which is 0.5% of the rated alternator current. Turns ratio of the neutral CT is 200/5. Determine- (i) The percentage of winding that remains unprotected. (ii) The maximum value of the earthing resistance required to protect 75% of the winding.
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