Abstract

Metro stray current can cause ground potential changes. Reasonable assessment of the potential fluctuation range is of great significance to ensure the urban AC power grid safe operation. Based on the multi-resistor parallel equivalent calculation method, the three-dimensional spatial distribution of multiple conductors in the power supply system can be reduced to the planar distribution of a single conductor. Then the numerical distribution of metro stray currents was effectively modeled. Based on CDEGS simulation software, a coupled model of stray current distribution and ground electric field was built, and the ground potential distribution caused by metro stray current was realized. Based on the actual metro line topology and structural parameters, the influence of the number of trains, operating conditions and soil resistivity on the potential distribution was analyzed. The research results can provide a certain reference for the substations location selection and the grounding equipment corrosion protection near the metro lines.

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