why we don't use air circuit breaker on H T line in place of
vacuum circuit breaker ?
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Answer / sayyid ahamed pm
at the time of opening of cb more current and high voltages are causes to produce high arc due to air and moister are help to produce fire
Is This Answer Correct ? | 7 Yes | 0 No |
vaciuum c.b is advanced.
At the moment arc, and the keying is more effective.
air c.b is more expensive.
Is This Answer Correct ? | 3 Yes | 3 No |
an amazing situation was faced when an alive distribution panel with 415 volts and carrying almost 200Amps has become short and this metal cubical showing 220 volts against neutral and earth. to redress any confusion i checked the panel with help of single 200watts test lamp which also glowing with max.intensity b/w neutral & metal body of DB. amazing situation is that i hold the DB firmly more than once with necked foot means without insulated shoes but not received any electrical shock. whereas our all running gen sets neutral points also proper grounded and this short DB was completely earthed , this is beyond my understanding . any body explain how is it possible . our running gen set neutral also grounded firmly
What is corona ? Mention its positve effects .
why exciter frequency 150 Hz ?
if we look on phasor of the transformer vaoltage is 180 oppsite at primary and the secondary so to improve a power factor is secondary should kept negative to improve it primary side means is -.90 became +.90 at other side
How can I communicate with an Areva MiCOM P121 relay by RS485 port? In other word, which command can I send and what information can I have recieved? please send some refrences, please. thanks
Can u start a tube light without a starter?
What is meant by Active and reactive power?
23 Answers College School Exams Tests, Schneider, Torrent Power,
WHAT IS MEANT BY TV TERMINAL IN 500MVA TRANSFORMER?
at the time of starting back emf of a motor is zero.so how can it will start to run??
what is the function of a Master trip relay? why is it used ?
5 Answers ABB, Nissi Engineering Solution,
why not phase to phase fault occure in raining day in hv sub-station?
Can anybody tell me why inductors draw lagging current and capacitors draw leading current from supply?