摘要
接触网工作环境恶劣,极易遭受雷击而影响铁路运输安全。给出了牵引网雷电安全评估方法,深入研究了接触网防雷保护的措施。研究结果表明:降低支柱的接地电阻,是减少雷击支柱顶部反击跳闸率、提高线路耐雷水平的最简单有效的方法;避雷器只建议在电分相、车站绝缘锚段关节处,以及长隧道两端等重要场合适量安装;避雷线的电磁屏蔽作用会使接触网上的感应过电压降低。绕击率是衡量避雷线保护作用的重要参数,设计时需根据具体情况,确定合理的避雷线保护角大小,最终将绕击率控制在能接受的范围内。
The working condition of catenary system is rather severe, which can be easily damaged by thunder strikes and thus affects the safety of railway transportation. Once the intercity railway is attacked by lighting and the protection is not effective, heavy casualties and serious social impact may happen. In this paper, a safety evaluation of lightning in catcnary system and some protective measures are studied intensively, the research indicates that low- ering the earth resistance is the simplest and most effective way to reduce the back strike trip rate and improve the an- ti-lightning capability; the arresters should be installed in important locations such as the articulated phase insulator, the insulated section joint at railway station and both sides of a long tunnel; the shielding effect of lighting conductor could reduce the induced over-voltage of catenary system; the protect angle of the lighting conductor should be confirmed according to practical situations, thus the shielding failure rate could bc controlled in an acceptable scope.
出处
《城市轨道交通研究》
北大核心
2013年第10期34-39,共6页
Urban Mass Transit
关键词
城际铁路
接触网
雷电安全评估方法
防雷措施
intercity railway
catenary system
safety eval- uation of lightning
lightning protection measures
