Dynamic Analysis of the Leakage Current Corrosion for the Non-Grounded DC Railway Systems

Abstract

This paper proposes the dynamic analysis of the leakage current corrosion for the non-grounded DC railway systems. In the non-grounded DC traction system, the current leaks from the track to the earth, sometimes for positive, sometimes for negative, thus this behavior to be similar AC power supply system. It is not unlike the diodegrounded system which only permits current to leak from the track to the earth and come back from the leakage diode to the negative side of the traction power substation. The electrical corrosion by AC current is less than by DC current, essentially. The corrosion quantity is proportioned to the leakage current corrosion to integral of the time. This paper uses Kaohsiung Mass Rapid Transit (MRT) as an example to simulate multiple traction substations and multiple trains for the non-earth system DC traction system.

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