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Multi-interval DC Traction System Simulator for Stray Current and Rail Potential Distribution

With the rapid development of urban rail transit, the safety problems caused by stray current and rail potential are increasingly serious. However, the stray current and rail potential solutions are difficult to verify in actual DC traction system. In this paper, a multi-interval simulator is proposed to simulate stray current and rail potential in traditional DC traction system and new multi-interval DC traction system. In the simulator, bidirectional variable resistance module (BVRM) is used as rail series resistance to simulate the train movement under different operation conditions; interval switching module (ISM) is used to divide the running rail into multiple intervals; a resistor is used as rail-to-ground resistance. Also, the parameter selection and control strategies are analyzed in detail. The simulation and experimental results show that the simulator can be employed not only to analyze the effects of stray current and rail potential, but also to evaluate methods which control these effects before they are implemented.