Answer / harshu

If we measure the vtg between neutral and ground, there may be a trace of "stray voltage"..that is, vtg in the neutral..its the product of current thr. Neutral(which is part of that circuit itself) and the impedence of that neutral wire.

we have one ups its neutral is not earthed.its one distribution MCB has a earth fault.but we can not put off any MCB.so how to find out that in which circuit is earthed without isolating the breaker.

3 Answers   CFCL,

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i have installed my solar site of 6.7kw and is working perfectly , can somebody tell me that how can i measure my solar irradiation kw/day/sq m ?

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List few applications of d.c series motor?

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explain why the secondary terminal of current transformer should not be lift open circuited.

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what is percentage impedance of transformer? explain its significance

2 Answers   ABC, Bosch,

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We have 2 no. 4MW DG set. and GEB supply. But, we running, only 1 DG set. when we done APFC/Power factor setting : 0.90, then winding temp. Low. but when setting done : 0.83, then Winding temp. increase. WHY Why ? ? ?, plz give me answer.

4 Answers  

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The company is wiling to buy you 5 pcs of equipments in your electrical tool kit. Plz tell what are the 5 things you want?

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how many minutes or seconds taken by the transmission of electrical power from generating end to distributing end?

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why use generator Earthing/Graunding.

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How silicon gel sucks moisture in the transformer, its have any small exaust fan behind silicon gel.

4 Answers  

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I did oil BDV test of 1600 KVA trafo 20KV/400V as per IEC 156. Result is 1) 58 KV 2) 58 KV 3)40 KV 4) 50 KV 5) 58 KV 6) 18 KV. Avr is 47 KV. Can we say oil is still ok even in the 6th test BDV is 18 KV ?

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what is meant by vector group of a transformer? How can it be derived?

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