Question

Power Systems

The portion of a power system shown by the one-line diagram of Fig. 5, with generating sources back of all three ends, has conventional primary and back-up relaying. In each of the listed cases, a short circuit has occurred and certain circuit breakers have tripped as stated. Assume that the tripping of these breakers was correct under the circumstances. Where was the short circuit? Was there any failure of the protective relaying, including breakers, and if so, what failed? Assume only one failure at a time.Draw a sketch showing the overlapping of primary protective zones and the exact locations of the various faults.

Note: This problem was taken from the book “The Art and Science of Protective Relaying, " by C. Mason, recommended in class.

Note: Assume that the system has remote back-up only. It does not have local back-up.


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