The present invention relates to a ground detection arrangement for an A.C. generator in which positive and negative D.C. voltages are alternately applied to the neutral point of an armature winding so as to detect voltages proportional to ground currents corresponding to the respective D.C. voltages,...http://www.google.fr/patents/US4542468?utm_source=gb-gplus-shareBrevet US4542468 - Ground detection arrangement for an A.C. generator
Ground detection arrangement for an A.C. generator
