Answer / sumit mishra from areva t&

Each & every switchyard are having set of equipment which
are required for tranmission/distribution of electricity.

So we cn classify the protection as..

Distance or line protection
Tranformer protection
Bus bar protection
Back up protection(O/C & E/F)etc...

How to calculate incoming cable size for 33KV, 1MVA transformer.

1 Answers   IAC,

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How to select the different contactors ( starter combination) for different AC motors? what about fuse cappacity 4 different motors too?

2 Answers   Equate,

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why air handling unit interloking in case of fire

3 Answers  

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what is the difference in inductance and resistance.both oppose the flow of current but how.resistance having + ve power in both cycle while inductance having both power.

5 Answers  

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Safety devices in SF6 Circuit Breaker?

1 Answers   DELL,

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State uses of different types of stsrters with different capacities of motors as below: a. up to 5HP b. above 5hp to 10hp c. above 10hp to 20hp d. above 20hp

0 Answers  

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what is disadvantages of high power factor

4 Answers  

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length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

2 Answers  

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I have 10 amp MCB for my air conditioner of 1.5 ton capacity. When I connect the ac direct it is started running but when connected through stabliser the Mcb Get trip and air conditioner couldn't start.please confirm whether Mcb is required to be upgraded to 20 amp. There is no fault in ac and the stabliser. Please advice the reason of tripping the mcb when connected through the stabliser.

1 Answers  

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What are the disadvantges of leading power factor

5 Answers  

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how to calculate vfd o/p voltage by frequency

0 Answers   HCL, Orchid,

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what is the thumb rule or formula for cable size and current ratings

1 Answers  

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