A ground detecting device for detecting a ground fault in a DC circuit, through which a DC power produced by converting a poly-phase AC power by an AC-DC converter is transmitted and which is connected at an earth point to the earth, is arranged to detect an earth current flowing through the earth point...http://www.google.fr/patents/US4430683?utm_source=gb-gplus-shareBrevet US4430683 - Ground fault detecting device for use with a DC circuit
Ground fault detecting device for use with a DC circuit
