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As per principle we say in three phase supply ,the voltage
is producing by phase angle between two phase so two phase
is needed means then why we using three phase ?
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Answer Posted / vijendra joglekar
As we know the sum of phase angle difference in poly phase
circuits will be 360 degree
i.e
Assuming that the phase R has maximum induced emf at this
instant the emf of other phase will be less then maximum value
when phase R is rotated by 120 degree in anticlockwise
direction phase Y will come in the portion of phase R and
its induced emf will be maximum further when phase R rotates
by 240 degree phase B will occupy the position of maximum emf.
Hence we have to use the three phase RY B for i mean when we
connecting poly phase circuits
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