电气化铁路接触网雷击过电压研究

Research on Lightning Over-voltage of Electrified Railway Catenary

在运用电气几何模型对接触网捕雷面进行分析的基础上,考虑地阻抗对导线参数及场线耦合的影响,利用修正的电报方程对雷击时接触网上的电压、电流分布进行求解。建立了绝缘子闪络模型,对雷击过电压下绝缘子闪络进行仿真,分析了支柱通过钢轨接地、支柱上架设避雷器等方式对接触网雷击过电压的影响。仿真结果表明,地阻抗会对接触网雷击过电压的幅值及波形产生一定的影响,应根据设备实际的绝缘配合水平来配置避雷器。

Based on a study of the catenary exposure surface with electrical geometry model, and putting the impact of ground impedance on conductor parameter and field line coupling into consideration, the distribution of voltage and current induced by lightning is solved by using the modified telegraph equation. A model of insulator flashover is estab- lished and simulated, the impact of lightning on pile/rail ground connection and the arrester erection are studied. Simulation results show that the ground impedance could impact the amplitude and waveform of voltage induced by lightning, so the arrester should be properly allocated ac- cording to the real isolation conditions.