1. A generator connected through a 5-cycle circuit breaker to a transformer is rated 7500 kVA, 6.9 kV with reactances of X" = 9%, X' = 15 % and X = 100 %. It is operating at no load and rated voltage when a three-phase short circuit occurs between the breaker and the transformer. Find: (a) the sustained short-circuit current in the breaker and the transformer (b) the initial symmetrical rms current in the breaker (c) the maximum possible dc component of the short circuit current in the breaker (d) the momentary current rating required for the breaker (e) the current to be interrupted by the breaker and the interrupting kVA
1. A generator connected through a 5-cycle circuit breaker to a transformer is rated 7500 kVA, 6.9 kV with reactances of X" = 9%, X' = 15 % and X = 100 %. It is operating at no load and rated voltage when a three-phase short circuit occurs between the breaker and the transformer. Find: (a) the sustained short-circuit current in the breaker and the transformer (b) the initial symmetrical rms current in the breaker (c) the maximum possible dc component of the short circuit current in the breaker (d) the momentary current rating required for the breaker (e) the current to be interrupted by the breaker and the interrupting kVA
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.53P: The ratings of a three-phase, three-winding transformer are Primary: Y connected, 66kV,15MVA...
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