what is DAR test?

2 Answers   Al-Naboodah, ISRO, ONGC,

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placing earthing pit in pathway is correct or wrong??. placing earthing wireGI1/18 inside walls is correct or wrong?. explain!!!

0 Answers  

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Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1.  H1-H2 = H2-H3 H3-H1 2.  H2-H3 = H3-H1 H1-H2 3.  H3-H1 = H1-H2 H2-H3 For the LV side also: 4.  X1-X0 = X2-X0 X3-X0 5.  X2-X0 = X3-X0 X1-X0 6.  X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0  H2-H0  H3-H0    X0-X1  X0-X2  X0-X3 128.0  119.9  7.2      29.2   13.3   15.8 70.7   128.4  59.2     23.4   22.0   3.6 7.2    120.1  128.1    13.4   29.3   15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?

0 Answers  

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why in large rating C.T.s equipotential wires are used?

2 Answers   Essar,

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What is excitation in case of dc motor?

0 Answers  

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am commissioning the trafo without connecting the neutral therefore unbalance will occur what is the alternative solution for this?

0 Answers   L&T,

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Differnce between negative Pahse SequenceFunction and unbalance Function?

0 Answers   Atsco, LMW Lakshmi Machine Works Limited,

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what is MUSS?

1 Answers   HP,

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an electric bulb or lamp can operate on ac and dc, if yes then why

5 Answers  

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I am selected in OCL(Orissa cement Limited), but they have a Tech PI round their at their plant.Anybody has any idea that what kind of questions they are going to ask??Please guies help me. I am in serious headache.I have heard that huge elimination is done at there.

0 Answers  

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what is meant by GOD in transmission system ?

6 Answers   Reliance,

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what is the differents and advantages of Electro magnetics relay and static relay ? what is the numerical relay ? advatages?......

7 Answers   CAT, L&T, TCS,

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