WHEN SINGLE PHASE SUPPLY AS 220V, WHY THE 3 PHASE- 4 WIRE MEASURED AS 440 VOLTS

WHEN SINGLE PHASE SUPPLY AS 220V, WHY THE 3 PHASE- 4 WIRE
MEASURED AS 440 VOLTS INSTEAD OF 660 VOLTS (220 VOLTS PER
PHASE i.e 220x3 = 660 volts ).

Question Posted / tahir wasim

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WHEN SINGLE PHASE SUPPLY AS 220V, WHY THE 3 PHASE- 4 WIRE MEASURED AS 440 VOLTS INSTEAD OF 660 VOLT..

Answer / rajiv mahajan

ac has frequancy. each phase goes maximum ,minimum and zero
in 50 times in a second. if you see ac phase cycle. you
can understand this as this way our alternator each phase
winding is placed at 120 degree.

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