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Consider the power system shown in Figure 2.27. The pu impedances of the two line sections and the generator are shown in the figure. Concentrating

Consider the power system shown in Figure 2.27. The pu impedances of the two line sections and the generator are shown in the figure. Concentrating on three-phase faults only, assume that the relay at bus A is set to pickup for a fault at bus C.

Assuming that the pickup setting is equal to one-third of the fault current, what is the pickup setting of this relay? If the dropout-to-pickup ratio for the relay is 0.1, what is the maximum load current at bus B for which the relay will drop out after the fault at bus C is cleared by the protection at B? Recall that after the protection at B clears the fault at C, the current seen by the relay at A is equal to the load connected to bus B, and if the relay does not drop out at this current level, the relay at A will trip its breaker on the load current.

(j0.2) (j0.2) Figure 2.27 System diagram for Problem 2.10

(jo.1) (jo.2) (jo.2) R A A B C Figure 2.27 System diagram for Problem 2.10

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