An apparatus and method for detecting a single-phase-to-ground fault on a three-phase electrical power system and for identifying the faulted phase conductor. Each phase conductor is monitored by evaluating three phasor signals associated therewith, i.e., the zero sequence current of the electrical power...http://www.google.fr/patents/US4536815?utm_source=gb-gplus-shareBrevet US4536815 - Protective relay apparatus and method for providing single-pole tripping
Protective relay apparatus and method for providing single-pole tripping
