Problem-2 A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by a differential current protection scheme using 1000/5 A current transformer. The star point of the alternator is earthed through a resistance of 7.5 Q. If the minimum operating current for the relay is 0.5 A, Calculate the % of each phase of the stator winding which is unprotected against earth- fault when the machine is operating at normal voltage.
Problem-2 A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by a differential current protection scheme using 1000/5 A current transformer. The star point of the alternator is earthed through a resistance of 7.5 Q. If the minimum operating current for the relay is 0.5 A, Calculate the % of each phase of the stator winding which is unprotected against earth- fault when the machine is operating at normal voltage.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Power Protatacton
![Problem-2
A star-connected, 3-phase, 10 MVA, 6.6 kV
alternator is protected by a differential current
protection scheme using 1000/5 A current
transformer. The star point of the alternator is
earthed through a resistance of 7.5 Q. If the
minimum operating current for the relay is 0.5
A, Calculate the % of each phase of the stator
winding which is unprotected against earth-
fault when the machine is operating at normal
voltage.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F23580142-15da-4a9c-a630-fc2d3e67bbf6%2Fe4df0741-018b-45f1-92e6-3995b2e9c833%2Fvq0dixv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Problem-2
A star-connected, 3-phase, 10 MVA, 6.6 kV
alternator is protected by a differential current
protection scheme using 1000/5 A current
transformer. The star point of the alternator is
earthed through a resistance of 7.5 Q. If the
minimum operating current for the relay is 0.5
A, Calculate the % of each phase of the stator
winding which is unprotected against earth-
fault when the machine is operating at normal
voltage.
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