A single-line diagram of a three-phase balanced system is given below. All the motors are rated with the same rating. The synchronous generator in the given figure is operating at 20KV, when a bolted three-phase short circuit occurs at point P. Calculate the rated interrupting current rating of circuit breaker B and C, both in per unit and Ampere value.

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
Chapter11: Transient Stability
Section: Chapter Questions
Problem 11.9P
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A single-line diagram of a three-phase balanced system is given below. All the motors are
rated with the same rating. The synchronous generator in the given figure is operating at 20KV,
when a bolted three-phase short circuit occurs at point P. Calculate the rated interrupting
current rating of circuit breaker B and C, both in per unit and Ampere value.
5000 KVA
G.9KV
25,0TO KVA
22 KV
25,00OKVA
Xm=15%
Metrr
A
13
Gen
22/11 KV
*g = 12%.
X= 10%
Transcribed Image Text:A single-line diagram of a three-phase balanced system is given below. All the motors are rated with the same rating. The synchronous generator in the given figure is operating at 20KV, when a bolted three-phase short circuit occurs at point P. Calculate the rated interrupting current rating of circuit breaker B and C, both in per unit and Ampere value. 5000 KVA G.9KV 25,0TO KVA 22 KV 25,00OKVA Xm=15% Metrr A 13 Gen 22/11 KV *g = 12%. X= 10%
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