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Answer Posted / mangesh salunkhe
neutral comes in star connected systems. As per kirchoffs
current theorem current comming at any junction is curent
going out from that junction. if we apply this law in star
connected systems we could find out that under normal
condiations current flowing in neutral is zero 0. in such
systems many a times neutral is connected as neutral path.
under normal conditions with rated voltage, pf equipment
draws rated current and consumes. hence we could find that
for balanced systems in neutral there is zero current. But,
under fault conditions (e.g. phase to ground fault at
equipment end) the current drawn from system is several
times than rated. this high current drawn from phase
conductors. if we allow this current to flow our system is
already damged but we also damages other networs connected.
hence to stop this current in short curcuit conditions we
use fuse in phase. once supply is disconnected thers no use
disconneting neutral!
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