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The distribution system shown in the figure below is to be protected by over current system of protection.
For proper fault discrimination directional over current relays will be required at locations
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- 1 and 4
- 2 and 3
- 1, 4 and 5
- 2, 3 and 5
Correct Option: B
For proper fault discrimination, the directional over current relays are located in such a way that for a fault at segment B, the breaker 2 should not trip and similarly for a fault at segment A, the breaker 3 should not trip. This is because without disturbing the supply to load the fault may be discriminated by the system. Also for radial system (segment C) directional relays are not needed since current flow during fault is in one direction. So in locations 2 and 3, directional over current relays are to be located.
