接地网格的雷电冲击特性  

Impulse Transient Characteristic of Grouding Grids

作　　者：高延庆[1] 何金良[1] 曾嵘[1] 

机构地区：[1]清华大学电机工程系,100084

出　　处：《电工技术杂志》2002年第12期9-12,共4页Electrotechnical Journal

摘　　要：系统地分析了发、变电站接地网格在雷电流作用下的冲击暂态特性 ,建立了基于分布的、时变电路参数的等效电路模型。该模型考虑了接地导体周围土壤电离引起的动态、非线性火花效应以及导体间互感的影响 ;详尽分析了不同接地装置的结构。A circuit model with lumped time-variable parameter is proposed to analyze the transient characteristic of grounding systems under lightning current,which takes into consideration the dynamic and nonlinear effect of soil ionization around the ground electrode.The ionization phenomena in the soil are simulated by means of time-variable parameters under appropriate conditions.The influences of structure of the grid,location of feed point,and shape of the lightning impulse current on the transient characteristic of grounding grids are discussed.

关 键 词：接地网格 雷电冲击特性 接地装置 暂态性能 冲击电流 等效电路模型 

分 类 号：TM862[电气工程—高电压与绝缘技术]