Answer Posted / parag
neutral is a point which is always kept at ground potential
i.e 0 volts. it's used for the completion of a closed
circuit.again we know that in a sinusoidal ac voltage
waveform the voltage varies from -V to +V.hence it has to
cross through the 0 voltage level.hence neutral is
necessary.again for the occurence of any type of fault the
neutral serves as a path for the passage of the fault
current. in a balanced 3 phase system for suppose a
y-conncted network Ia+Ib+Ic=0.For an unbalanced 3 phase
fault we see that Ia+Ib+Ic=If....which is the fault current
and it flows throught the neutral..
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