摘要
对雷电流影响信号电缆的途径进行分析,得到雷电流主要通过空间感性耦合与大地阻性耦合干扰信号电缆.根据线路接触网模型,用电磁暂态软件ATPDraw搭建雷击接触网绝缘子闪络雷电流传播仿真电路.研究表明:电缆外皮电流耦合过电压及大地阻性耦合引起的电位升高对信号电缆的影响最大;接触线、贯通地线及保护线中电流耦合到电缆芯线的电压相对较小;信号电缆接地电阻的增大使芯线电压升高.通过降低信号电缆接地电阻、单独设置接地极等措施改善雷击对信号电缆的干扰.参考京沪高速铁路接触网防雷加强实施方案,对复线线路避雷线架设高度进行分析,给出建议架设高度,提高接触网耐雷水平.
The signal cable was interfered by the lightning current mainly via the space inductive coupling and the earth resistive coupling when we analyzed the way that lightning current acted on the signal cable. Accord-ing to the catenaries model of the route, electromagnetic transient software ATP-Draw was used to establish lightning catenaries insulator flashover lightning current propagation simulation circuit. Studies have shown that： Cable sheath current coupling led to over voltage and the earth resistive coupling caused the potential rise, and both factors have the biggest influence on signal cable. While contact line, protection line and through ground line current coupled to the cable core voltage is small, signal cable core over voltage along with the increase of grounding resistance increases. By reducing the signal cable grounding resistance, separate set of earth electrode and other measures to improve the lightning interference on the signal cable. References to catenary lightning strengthen the implementation program of Beijing-Shanghai high-speed railway; this paper also analyzes the height of ground wire erected, and gives advice erection height to improve the catenary light-ning withstand level.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2013年第1期70-74,共5页
Journal of Zhengzhou University（Engineering Science）
基金
甘肃省科技计划资助项目(1112RJZA046)
关键词
雷电流
耦合
信号电缆
接地电阻
地电位升
避雷线
lighting current
coupling
signal cable
grounding resistance
potential rising on earth
groundwire
