Answer / ashish patil

Preclose means breaker in off condition it supervise the trip coil & trip ckt is healthy.
& Postclose means It supervise When breaker is ON.

Answer / k.prakashchandra

It will supervise the trip circuit before and after closing
the breaker

why we are using earth pit in sub stations.?

0 Answers  

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what are the advantages and disadvantages of speed control of 3 phase induction motor by varying frequency explain with drawing

0 Answers   ABB, Genpect,

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what is the ground clearance of 400KV transmission line?

9 Answers   Power Grid, wbsedcl,

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2 Answers  

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What is control system?

0 Answers  

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What is the full form of SON-T lamp?

1 Answers   HAL,

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1 Answers  

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how and where megger works?

9 Answers   Power Grid,

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What are the various reasons for an inductin motor to get heated?

1 Answers   Monnet,

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what is the importance of fault level in power system and how is it decided

2 Answers  

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size of condotory fron voltage level

0 Answers  

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