Abstract

The low resistance characteristic of urban power grid makes it a good flow path for subway stray current. The distribution characteristics of stray current at transformer neutral point in AC power grid are closely related to the leakage characteristics of stray current on subway track. As far as possible, the subway system will monitor the stray current, but it cannot give a more in-depth analysis and treatment plan of the stray current invading the urban power grid. In this paper, a simplified calculation model of stray current distribution in urban AC power grid is proposed. Based on Monte Carlo method, the distribution law of stray current in power grid and the relationship between rail transit stray current leakage are given from the perspective of random analysis. Based on the results of the analysis, the paper further puts forward the optimization of rail transit stray current monitoring point selection scheme, by selecting fewer substations with wider coverage and more sensitive to stray current changes as current monitoring points. The results of calculation and analysis show that the optimization of stray current leakage monitoring of rail transit by using Monte Carlo simulation can improve the economy and effectiveness of leakage point location.

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