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why transmission voltages are in multiple of 11kv?
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Answer Posted / tom reji
3. The power loss in line is proportional to
resistance and square of current. (i.e. P LOSS=I^2*R).
Higher voltage transmission and distribution thus would
help to minimize line voltage drop in the ratio of
voltages, and the line power loss in the ratio of square of
voltages. For instance, if distribution of power is raised
from 11 kV to 33 kV, the voltage drop would be lower by a
factor 1/3 and the line loss would be lower by a factor
(1/3)^2 i.e., 1/9. Lower voltage transmission and
distribution also calls for bigger size conductor on
account of current handling capacity needed.
4.
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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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