Why are the cores of large transformers built up of circular transactions ?

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what is meant by impedence? can you describe easy becuse iam not well familier in electrical?

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what is high pot test on 11kv switchgear and how to apply high voltage on panel what is spheare gap and how to determine its celeberation.

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What are the rating wise protections required for Generators from 600KVA to 2000KVA

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v=I*R, i.e V is directly proportional to I. now P=V*I. so V=P/I. thus v is inversely proportional to I. so what is the correct one? If both are correct than for which kind of condition this 2 differ

3 Answers  

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Readings of ER300P Trivector meter

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In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes

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What's difference between a400amps lt contactor and a400amps lt circuit breaker

3 Answers   Indian Railways,

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how the grounding[earting] is achieved on ships.

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Why we use cosine angle for calculating power factor not in sine angle ?

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0 Answers   Bhel,

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FOR 16/20 MVA 132/33 KV ONAN/ONAF TYPE TRANSFORMER IT IS DESIGNED FOR 16 MVA WITH ONAN CONDITION.IT BECOMES 20 MVA UNDER ONAF CONDITION.LOAD LOSS IS GUARANTEED FOR 65KW AT 20 MVA AND % IMPEDANCE 13.75. PLEASE TELL US AT WHAT LOAD LOSS AND % IMPEDANCE IT SHOULD BE DESIGNED FOR 16 MVA AND WHAT WILL BE ITS EFFICIENCY AT 20 MVA?

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