高速铁路暂态模型搭建与仿真分析

Setting up of Transient Model and Simulation Analysis for High Speed Railway

借助电磁暂态分析软件系统搭建了高速铁路接触网暂态模型。分析了不同雷击点对接触网耐雷水平的影响和不同避雷器安装方式下的防护效果。仿真结果表明:雷击跨距时雷击位置对不同避雷器安装方式防护效果影响很大,在避雷器安装方式1下,雷击点距支柱15m时接触网耐雷水平减小约80%,为13kA。随着距离增加到一个跨距时耐雷水平下降最大,仅为3.25kA,与未安装避雷器时的耐雷水平相等,即避雷器保护失效。另外,不同避雷器安装方式对接触网耐雷水平影响也很大,以避雷器安装方式4为例,接触网耐雷水平与未安装避雷器相比提高约84.15kA。建议在雷击点选用避雷器安装方式1。

The high speed railway overhead contact line transient model is set up with assistance of electromagnetic transient analysis soft ware.The paper analyzes the interferences to the lightning resistance of the overhead contact line caused by different lightning strike points,analyzes the protection effects under the lightning arrestors installed in different modes.The simulation results show that the different spans of lightning strike points will have great interferences to the protection effects of the lightning arrestor’s installation mode,under the lightning arrestor’s installation mode 1,its lightning resistance will be 13 kA,about 80% being reduced.The lightning resistance will reduce dramatically as the distance increases to be a span length,it is only 3.25 kA,equals to the lightning resistance where the lightning arrestor is not installed,that means the protection of the lightning arrestor has been invalid.Furthermore,the different installation modes of the lightning arrestors will have great interference to the lightning resistance of the overhead contact line,take the lightning arrestor’s installation mode 4 as an example,the lightning resistance of the overhead contact line will increase 84.15 kA compared with it not installed with the lightning arrestor.It is proposed to select the lightning arrestor’s installation mode 1 at lightning strike point.