Answer Posted / ajay kumar
NGR MEANS NUTRAL GRAUNGING RESISTOR WHICH IS CONNECT TO
STAR POINT OF TF&ALTRNATOR WHICH WORK TO BALANCE THE AXESS
CURRENT IB THE UNBALANCE CONDITION AND ALSO EARTH FALT
ACCURE IN IN MACHINE THR CURRENT SLITLY GROUND THROUGH IT
AND PROTECT THE MACHINE . IT IS USED UP TO 11KV SYSTEM
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