A star connected, 3-phase, 20 MVA, 6.6 kV alternator has a per phase reactance of 20%. It is protected by merz-price circulating current principle which is set to operate for a fault current of 180 A. Then calculate the reactance per phase of 20% of winding. (A) 0.40 (C) 0.042 02 (B) 0.80 (D) 0.087 0

Power System Analysis and Design (MindTap Course List)
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ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter9: Unsymmetrical Faults
Section: Chapter Questions
Problem 9.2P
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46. A star connected, 3-phase, 20 MVA, 6.6 kV alternator
has a per phase reactance of 20%. It is protected by
merz-price circulating current principle which is set to
operate for a fault current of 180 A. Then calculate the
reactance per phase of 20% of winding.
(B) 0.80
(D) 0.087 02
(A) 0.49
(C) 0.042 0
Transcribed Image Text:46. A star connected, 3-phase, 20 MVA, 6.6 kV alternator has a per phase reactance of 20%. It is protected by merz-price circulating current principle which is set to operate for a fault current of 180 A. Then calculate the reactance per phase of 20% of winding. (B) 0.80 (D) 0.087 02 (A) 0.49 (C) 0.042 0
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