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what is phase voltage and line voltage? in line voltage how
415v is obtained?
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Answer Posted / mark
When you have multiple phases (lines with voltages having
different phase angles)there different ways of defining
voltage. Say you have 4 lines: Line A, Line B and Line C
and Neutral. Now let's say you have a "3 phase" source of
480V connected to these lines. Each line represents
a 'Phase'.
If you were to measure the voltage between, arbitrarily
choosing Line A and Line B, you would measure 480V. Now,
if you were to measure the voltage between Line A and
Neutral you would measure a much lower voltage. Namely,
480V divided by the square root of 3. This difference
shows that each 'line' is not actually carrying 480V. But
when you reference one non-neutral line with another non-
neutral line you get 480.
This is because you are referencing two voltage lines that
are out of phase with each other (in this case 120 degrees
out of phase). Therefore, the voltages will not be
in 'sync' and the differences will result in higher peak
voltages (480 in this case).
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