GATE EE 2016 Set 2 — Question 23
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Power Systems → Power System Protection → Overcurrent Protection
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Question
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 to . Assuming a mix of directional and nondirectional relays at appropriate locations, the remote backup relays for are
Correct answer
(D) R₁, R₆
Solution
For a fault on the transmission line between the middle bus and the right bus, the primary relays are and . If fails to operate, the fault must be cleared by the next upstream relay in that direction, which is . Similarly, if fails, the backup is . Therefore, the remote backup relays for the protection zone involving are and .
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