can anybody sent me power grid questions. what subject should i prefer for preparation?

0 Answers   Reliance, Vascon,

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how we calculate the dick for a pole?

0 Answers   Power Grid,

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what instruments used for measuring of inductance and capacitance.

2 Answers  

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What is different between resistance grounding system and resistance earthing system?

0 Answers  

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how to determine the cable size...pls explain me with the formula taking particular load....does the factors like impedance & short circuit rating influence the cable size, if so how....

0 Answers  

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what is elcb

2 Answers  

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why we multiply 11 in High Electric supply?(eg.11KV, 33Kv, 330Kv etc.)

3 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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How will polarity test of Dy5 transformer ?

2 Answers   BSL,

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SMPS (Switch Mode Power Supply) unit is denoted by KW or KVA?

6 Answers  

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Define branch?

0 Answers  

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what is the acceptable insulation resistance for motor/transformer?

2 Answers   Reliance, Tata Motors,

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