Fast Calculation of Stray Current in High-Speed Railway Station and Its Potential Interference to Ground Resistivity Observation Environment of Seismic Station

The observation environment of seismic station is rather sensitive to external electromagnetic interference, of which stray current of high-speed railway station is an important interference source. With the increase of scale and speed of high-speed railway, the interference potential caused by its stray current becomes more serious. To analyze the distribution of interference potential, this paper obtains the steady-state potential of station traction network based on multi-conductor transmission line theory and mutual inductance iterative node method. Thus, it can be fast calculated that the stray current both inside the station and of the semi-infinite part of two ends, and total interference potential generated on the buried measuring pole of remote seismic station. It can be deduced that the equipotential line of interference potential is basically distributed in circle, and is positively correlated with its distance from railway station and soil resistivity, which provides a foundation for further analysis of interference of high-speed railway on seismic station geomagnetic observation, and for optimization of site selection of seismic station and high-speed railway.