For the system shown in Figure 2, the fault at F produces these differing respon

Question

For the system shown in Figure 2, the fault at F produces these differing responses at various times. They are listed below: R3 B3 and R4 B4 operate; R2 B2, R3, R4 B4, and R5 B5 operate; R3 B3, R4 B4 and R1 B1 operate; R6 B6.R4 B4, and R1 B1 operate. B1 to B6 are circuit breakers. R1 to R6 are protective relays which provide primary protection and all necessary backup protections. Operation of a particular relay could be due to its primary or backup protection. Assuming that there is only one failure at the maximum for each of the cases listed, analyze each of these responses for fault at F, and discuss the possible sequence of events that may have led to these operations. Classify each of the abovementioned responses as "correct" or "incorrect" operation of the relay "correct" or "incorrect" operation (or non-operation) of the breaker Also determine whether there was a loss of dependability or a loss of security in each of these cases.

Explanation / Answer

A).R3B3 and R4B4 are for the protection of both buses as well as protecting the line. B).Incase of any fault before R2B2 it will operate theR5B5 R3 and which operate R4B4. C).if the fault rises between R4B4 and r3B3 it will operate the R1B1 to isolte the buses from system. D).if there is fault after the R4B4 and R6B6 the will operate R1B1 to disconnect the whole system.

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