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what is phase voltage and line voltage? in line voltage how
415v is obtained?
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Answer Posted / gurumoorthi
Line voltage is the potential difference between two lines of different phases. This means there are actually 3 line voltages on a three-phase system; A-B, A-C, and B-C. For a balanced system, the three must be equal.
Phase voltage is the potential difference between a line and neutral. A three-phase system has three phase voltages as well; A-N, B-N, and C-N. For a balanced system, all three must be equal.
For three-phase Alternating Current (AC) circuits, there is a relationship between line and phase voltage that is defined by the connection method (wye or delta).
WYE:
(Line voltage) = (Phase voltage) * sqrt(3)
(Line current) = (Phase current)
DELTA:
(Line voltage) = (Phase Voltage)
(Line current) = (Phase current) * sqrt(3)
For single-phase circuits (AC and DC), line parameters (current and voltage) are the same as phase parameters. This is because one leg is referred to as having 'potential', while the other is generally referred to as the 'return' or 'neutral' or 'ground'.
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