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

Yow-Chyi Liu 1, En-Chih Chang 2, Juei-Lung Shyu 1, and Xin-Gang Chen 1
1. Department of Electrical Engineering, Kao Yuan University, Kaohsiung City, Taiwan, R.O.C.
2. Department of Electrical Engineering, I-Shou University, Kaohsiung City, Taiwan, R.O.C.

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 diode-grounded 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.

Index Terms—leakage current, DC railway system, non-grounded system, diode-grounded system

Cite: Yow-Chyi Liu, En-Chih Chang, Juei-Lung Shyu, and Xin-Gang Chen, "Dynamic Analysis of the Leakage Current Corrosion for the Non-Grounded DC Railway Systems," International Journal of Electrical Energy, Vol. 3, No. 4, pp. 257-261, December 2015. doi: 10.18178/ijoee.3.4.257-261

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