接触网和接触轨两种供电方式下地铁线路耐雷击水平分析与比较

架空接触网供电和接触轨供电是地铁线路常见的两种供电方式。运用CDEGS软件建立了接触网线路和接触轨线路模型,仿真分析两种方式下雷击位置及高架桥高度对耐雷击水平的影响,以及接触轨供电方式下避雷带架设高度对耐雷击水平的影响;比较了两种供电方式下的耐雷击水平差异并解释了原因。结果表明,两种供电方式下,雷击点距接地点越远,耐雷击水平越低;高架桥越高,耐雷水平越低。接触轨供电方式下,避雷带越高,耐雷击水平越高。接触轨供电方式下的耐雷击水平较接触网供电方式高得多。

Comparative Research of Lightning Withstand Levels between Metro Catenary Mode and Contact Rail Power Supply Mode

Overhead catenary and contact rail are two kinds of common power supply modes in metro system.The lightning withstand levels of the two power supply modes are researched by using CDEGS software to establish a simulation model.The effect of lightning strike positions and height of elevated bridge on lightning withstand level is analyzed.The differences of lightning withstand levels between catenary mode and contact rail power supply mode are compared,the courses are explained.When the point of strike is higher from the ground,the lightning withstand level is lower,otherwise on the contrary.The research shows that the lightning withstand level of contact rail mode is higher than that of the overhead catenary.