what is relay what is protection & contact multiplying relays where it is used function in brief

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3Cx240 & 3Cx300 sqmm Al. cable from lv side. What is the calculation for this cable??

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to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power

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Transformer Secondary maximum current (max. load)

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why we did not mention ryb like byr in 3 phase

2 Answers   Ford,

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A Generator is in running condition and Rotor earth fault alarm is coming.How to check on line(i.e in running condition) whether there is actual earth fault in rotor or not.

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How we check vector group for a Dyn1 transformer?

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What is the basic principle of circuit breaker?.. I read that it works on electro-mechanical principle... Does it require both electric n magnetic conversion to act?

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When both contractor star & delta is hold in star delta motor ?? So what happen in this case ??

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do we use links in a dc circuit?if so what s its use in it?

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with 3 phase board on a 63 amp rcd is it ok to have 6 electrical showers 2 on each phase and what problems could happen

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is there or does RCCB work for single phase connection?

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