Answer / 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.

Answer / avinash

3 phase star connected motor no need to grouned neutral
because mostly load current is balanced. But 6.6 KV y
connected motor has provided neutral c.t. for protection
purpose. so grounded neutral is providing in HT MOTOR.

Answer / santosh kawade

3 phase motor is a balance load, hence we are not require
to connect star point of star connected motor to ground.

Due to balance load there will not be any current flow from
neutral and connecting star point create unnecessary
wastage of material and money.

santosh kawade

please send me previous year questions of jspl through which i could prepare myself for the test.

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