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 signal injecting method, resistance method and so), developing a novel fault approach by using both the feeding current and voltage to detect and locate the high-resistance grounding fault in DC railway traction system is necessary. The simulation results prove that the exact fault location can be accurately predicted in this way. Through comparison of several different analysis methods, this paper concludes that with the digital signal processing the location can be executed more precisely. Extensive simulations with diverse fault conditions are performed to verify the means.
Due to the increased strain of the urban ground traffic, the DC railway transit system has been developed rapidly to solve the traffic problems. Therefore, it is important to ensure the security and reliability of the DC traction power supply system. Low-resistance grounding fault has an extremely deadly effect against the safe operation of urban rail transit system. Furthermore, it is difficult to locate the fault position because of little available statistical information. In order to locate the fault position rapidly, a method is proposed by transforming the DC traction power supply system circuit into the Bergeron equivalent circuit and calculating the voltage distribution of the catenary. This paper the details of this algorithm.. Simulations are used to verify the accuracy of this approach.
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