A power system with two generators is shown in the figure below. The system (generators, buses and transmission lines) is protected by six overcurrent relays R 1 to R 6 . Assuming a mix of directional and non-directional relays at appropriate locations, the remote backup relays for R 4 are

GATE Electrical Engineering (EE) 2016 Shift 2 Solved Paper

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A power system with two generators is shown in the figure below. The system (generators, buses and transmission lines) is protected by six overcurrent relays R₁ to R₆. Assuming a mix of directional and non-directional relays at appropriate locations, the remote backup relays for R₄ are

R₁, R₂
R₂, R₆
R₂, R₅
R₁, R₆

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