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我国的电气化铁路正处于大发展时期,铁路的建设和运营中存在众多的安全技术问题亟待解决。牵引供电乃至整个信号系统的电磁环境关系到行车的安全。地磁暴是一种极端的空间灾害性天气,引起地球的磁场剧烈扰动,地表面产生感应电动势(Earth Surface Potentials,ESP)。ESP、接触网和大地三者之间构成回路,就在牵引供电系统中引发了地磁感应电流(Geomagnetically Induced Current,GIC)。建立了磁暴侵害电气化铁路系统的GIC等效电路模型,并给出了GIC的算法,估算了流过牵引网和机车中GIC的大小,为进一步研究磁暴对电气化铁路系统的影响和防治策略奠定了基础。
China’s electrified railway is in a period of great development. There are many safety and technical problems in the construction and operation of the railway. Traction power supply and the entire signal system of the electromagnetic environment related to traffic safety. Geomagnetic storm is an extreme space disaster weather, causing the Earth’s magnetic field violent disturbance, the ground surface produces induced electromotive force (Earth Surface Potentials, ESP). ESP, catenary and the earth constitute a loop between the three, in the traction power supply system induced geomagnetically Induced Current (GIC). A GIC equivalent circuit model with magnetic storms encroaching on the electrified railway system is established. The algorithm of GIC is given, the size of GIC flowing through the traction network and the locomotive is estimated, which lays the foundation for further research on the influence and control strategy of magnetic storms on the electrified railway system basis.