Abstract: An arc fault protection circuit and method, provides arc fault protection in a multiphase power system by actuating a plurality of disconnect switches to disconnect the source from the load in response to detecting arcing proximate the load. As well, in response to detecting the arc, a plurality of impedances are introduced into the current path between said source and said load, with each of the impedances increasing the impedance between the source and the load along one phase, prior to the plurality of disconnect switches disconnecting the source from the load.

Abstract: An arc fault protection circuit and method, provides arc fault protection in a multiphase power system by actuating a plurality of disconnect switches to disconnect the source from the load in response to detecting arcing proximate said load. As well, in response to detecting the arc, a plurality of impedances are introduced into the current path between said source and said load, with each of the impedances increasing the impedance between the source and the load along one phase, prior to the plurality of disconnect switches disconnecting the source from said load.

Abstract: A train including a multi-phase electrical distribution network permitting easy detection and location of ground faults, and a method of detecting a ground fault on such a train are disclosed. Net current tapped at each of the cars is sensed. In the event the net current tapped at a car does not equal zero, an alarm signifying a ground fault at that car is triggered. In this way, ground faults on the train may be easily located and serviced.