11. As per the theory current doesn’t flows in Neutral, but practically it i

11. As per the theory current doesn’t flows in Neutral, but
practically it is
not applicable, explain why?
12. How to take the Vector Group Test in Transformer? What
is the purpose
of doing Vector Group Test?
13. Why the transmission lines are in 11kV, 22kV, 33kv, and
why not 10kV,
20kV, 30kV?
14. Why do we generate 3 Phase AC Supply? It is possible to
generate 4
Phase and 5 Phase explain it?

15. Explain why the Voltage drop will happen in 3 Phase
line?
16. What is the equipment used to control the generator
output?
17. What are the factors to be considered during the
Synchronization?
18. What should be value of Circuit breaker operating time
and tripping
time?
19. Why the CT Secondary is rated as 5A generally?
20. At which time Synchronous generator act as a
Synchronous Condenser?

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11. As per the theory current doesn’t flows in Neutral, but practically it is not appli..

Answer / ashok pandey

17. At DG synchronization, phase angle, frequency & voltage
level of both DG set must be same.

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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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