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Resistors

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Question

The distribution system indicated below is to be protected with over current protection. Identify the locations where essentially directional over current relays will be required considering proper fault discrimination.

A

Br-2, Br -3, Br -5 and Br -6

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B

Br-1, Br -4, Br -7 , Br -5

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C

Br-2, Br -3, Br -6

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D

Br-1, Br -4, Br -8 and Br -7

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Solution

The correct option is C Br-2, Br -3, Br -6
Directional relays are not required at supply side and load side because power flow is unidirectional.

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