Why air circuit breaker off due to power failure?

0 Answers  

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In DC current-excitation to transformer, why it sucks more current? Eventhough there is no power transfer between primary and secondary? R is very low so it should suck less current only na thn y its current increases?

2 Answers   Cairn,

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why do we prefer VCB over OCB? what are the advantages of Vaccum Ckt. Breaker over Oil Ckt. Breaker?

2 Answers  

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fundamentals of transformers.

5 Answers   Adani,

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How to select transmission line type (i.e. 11kv or 33kv) for new established industries

0 Answers  

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what are carbondioxide and dcp used in fire extinguishers

0 Answers  

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What is online and offline ups? how does it works?

0 Answers   Call Centre,

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How to calculate the ups battery back up? give the formula.

15 Answers   Cushman Wakefield, Ethio Telecom, Exide, MacLellan, Morgan Stanley, TATA,

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It is being often experienced that due to single phasing fault of any source transmission line of any closed loop synchronized circuit all the power transformers with primary stared trips but the power transformer with primary delta wont, why ?

1 Answers   MSEB,

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how to calculate energy of 3-phase motor?

0 Answers   Suzlon,

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CAN 50Hz transformer work at 60 Hz power supply? if yes how it is possible?

2 Answers  

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i am using star-delta connections with reverse/forward direction motion of the 75hp induction motor.What should be the ratings of Main,Delta and Star contactors and why?

1 Answers  

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