which is more dangerous AC\DC supply

3 Answers  

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what does happen if generator frequency fall in running condition & what should require immediately

4 Answers  

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what is a circuit breaker. Weite the types of circuit breaker.

4 Answers  

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which protection used in power plant?

0 Answers  

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how to carried out tan delta test in 11 KV alternator ?

0 Answers  

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What are the main problems in distribution? I have to do an assignment so which problem should I choose? Like power factor problem etc.

4 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?

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what is the instataneous value of voltage in a 3-phase balanced star connected circuit?

6 Answers  

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Differentiate between power relay and reverse power relay?

2 Answers   ABB, TVS,

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why use phase displacement in transformer.and effect of phase displacement on transformer

0 Answers   IOCL, ONGC,

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how does ELR works? explain

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What is the general power factor & min. power rating of TV,LCD type TV, CRt type TV, Scanner, printer?

0 Answers  

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