Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

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75 kw motor take 45 amp in no load delta in star 10 amp but in load it will take 160 amp but IR velue of winding above 500 at 1kw ph to earth and ph to ph. what problem it should be?

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How can we measure the residual voltage in dc machines?

0 Answers   GPREC,

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in electric lamp what is ballast. y its needed to start & stop lamp. what is ballast ckt.

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which part of transformer heats up the most and why? windings, core or oil .

3 Answers   Lafarge,

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Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632

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1.what is the funtion of chiller primary & scondary pumps. 2.what is the use of distribution lines & Types. 3.what is the use the thermal power stations & how much capacity.

0 Answers   Wipro,

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hoe to select the cable size in sq mm for certain load?

5 Answers   TCS,

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i want prepare power grid exam what are book we want refer for electrical ?

5 Answers  

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what r Grid stations?what r there role.Explain in detail

1 Answers  

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why 120 devided with pole and speed multiplication to determine frequency

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how to select a air/vacuum circuit breaker.is there any thumb rule???

1 Answers  

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