High-resistance grounding fault detection and location in DC railway system

Locating high-resistance grounding faults poses a tough and challenging problem for the safety of DC railway systems. High-resistance grounding fault current isn't sufficient to trigger switches, which may expand the accident or turn into potential hazards. In order to overcome the limits of the existing methods (such as the signal-injecting method, resistance method and so on), it is necessary to develop a novel fault approach by using both the feeding current and voltage to detect and locate high-resistance grounding faults in DC railway traction systems. The simulation results prove that the exact fault location can be accurately predicted in this way. Through comparison of several different analysis methods, this presentation concludes that, with digital signal processing, the location can be found more precisely. Extensive simulations with diverse fault conditions are performed to verify the method.