why dc is used in control circuit for mv & hv switchgear instead of ac

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how fluoresent lamp works??

2 Answers  

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What is UJT PNP, NPN transistor & working principles?

1 Answers   TATA,

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Installation resistance for whole installation of 16 kva & 25 KVA DTRA a) Between each conductor b) between conductor to earth c) installation resistance for each apparatus, each conductor to earth d) earth resistance for the system of earthing

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why dc supply given to ac alternator rotor

3 Answers  

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why we grounding the neutral of a transformer?

3 Answers   GAS,

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what is meant by PU value ? anyone can you explain briefly to me ?

3 Answers  

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Dear all, is ther any body who can tell me about the setting of ACB(air circuit breaker ). what kind of it,s setting is and how to do it,s setting. also please tell me the setting of VCB(vaccume circuit breaker) . please tell me their setting,s. i will b very thank ful to all of u. Thank,s and Regard,s. Muhammed Ikram.

2 Answers  

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what will happen if the connections of protection ct reverse? will it burn the ct?

2 Answers  

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When do you use a VFD motor?

3 Answers  

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what is the ohmic value of transformers

1 Answers  

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What is the normal phase difference between the voltage and the no-load current in a transformer?

0 Answers  

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