For the three-bus power system shown in the figure, the trip signals to the circuit breakers B₁ to B₉ are provided by overcurrent relays R₁ to R₉, respectively, some of which have directional properties also. The necessary condition for the system to be protected for short circuit fault at any part of the system between bus 1 and the R-L loads with isolation of minimum portion of the network using minimum number of directional relays is

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Examsnet · Accepted Answer

Correct Answer is : R3 and R4 are directional overcurrent relays blocking faults towards bus 2

GATE Electrical Engineering (EE) 2023 Solved Paper