Answer Posted / leo felix.d

The transfromer's secondary which is feeding 3 phase motor
is already earthed.so there is no need to earthe the motors
star point again. Because earth resistance wont be same
every where.If we eartherd both the ends,there will be a
current flow between two neutrals.
universaly,in industries 70% of loads are inductive tupr
which are having lagging PF nature.Always load only decides
the power factor not source(Alternator).So that only the
rating always mentioned as VA and not watts.

when the time of backcharging the transformer three phases only enough or three phase with neutral is must.from these which one is the best one.

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electrical ques

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