Answer / istiak

in measuring polarities of a transformer we use a very small
battery or dc supply voltage source.in that case,if we use
alternating current replace of D.C then we couldn't find
polarities because ac changes it's side within a few moment
and dc doesn't..................

Answer / k.prakashchandra

To create momentary magnetic field

PLease anyone can tell me CTUM-15 specification?

1 Answers   Gilbert Maxwell,

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electric contractor ya contactor kia hota hy ? or kesy connect kia jata hy ?

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what is meant by k-rating in isolation transformer?what is k9, k14 stands for?

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what is dyn 11

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why star connected transformers used in tneb?

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how can we find of cable capicity in amper?how much ampere withstand by 300sqmm cable?

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what is the meaning of "i.p.-43" and duty cycle-s1 on the name plate of a asynchronous machine?

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Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz. From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.

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How to convert a two phase power into a three phase power in induction machine?

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what methods are used to improve power factor?

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why the transformer connected like STAR- STAR, DELTA- DELTA, STAR- DELTA, DELTA-STAR ...? why these connections ,,, explain the advantages these connections?

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i will applied in 1U-1W on 440 volt primary delta side. what is the result of magtic balance test

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