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why neutral of 6.6 kv star connected sq. cage induction
motor does not get earthed, though for earth fault
protection it is must.
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Answer Posted / budhaa lal
because we use the CBCT both side(feeder side and in motor
winding R,Y,B.)and for earth fault protection we give the
both ct's output to the motor protectio relay. and when
earthfault ocurres in motor there is unbalance in core
respectively and sensing by motpro relay and it gives
tripping as per setting.
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