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Question

During the insulation co-ordination in the sub station, the lowest insulation strength is at

A.

CTs and PTs 

B.

transformer

C.

circuit breaker 

D.

busbar

Answer ( Option B)

transformer

Solution

Insulation coordination is the process of knowing the insulation level of the power system component. In other words, it is the process of determining the insulation strength of the equipment.

Line diagram of substation :

During the insulation co-ordination in the sub station, the lowest insulation strength is at transformer.

Hence, the correct option is (B).

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