低压系统的雷电过电压  

Lightning Over-voltages in Low-voltage Systems

作　　者：刘明东[1] 

机构地区：[1]上海电器科学研究所,上海200063

出　　处：《电瓷避雷器》2005年第4期35-39,共5页Insulators and Surge Arresters

摘　　要：介绍了雷电放电的发展过程和放电的统计特性,统计表明,17%的雷电流具有不大于1μs上升时间;90%的不大于8μs的上升时间;50%的雷电流波长约为(26￣50)μs。并论述了低压系统因雷电放电而产生过电压的4种不同偶合机制即:雷直击于低压导电系统或防雷系统的电导性偶合,雷击防雷系统的接闪器或低压系统传导线时的容性偶合、感性偶合及雷电远距离干扰低压系统传导线时的辐射偶合(电磁偶合)。认为低压系统过电压的威胁主要来自雷电放电。The development process and statistical particularity of lightning discharge are presented. Four coupling mechanisms of over-voltage occurrence due to lightning discharge on LV systems are described, i.e., conductive coupling caused by direct thundering on LV conductor or lightning protection system, capacitive coupling caused by thundering on lightning adaptor of lightning protection system or onto LV leading conductor, reactive coupling and electromagnetic coupling caused by remote thunder interference on leading conductor of LV system. The main threat of over-voltage at LV system is mainly attributed to thunder discharge。

关 键 词：雷电过电压 先导放电 主放电 波阻抗 耦合 

分 类 号：TM862[电气工程—高电压与绝缘技术]