Grounding fault location in DC railway system

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.