改进电气几何模型对输电线路绕击率的计算及典型故障分析  

Calculation of Shielding Failure Rate on Transmission Line Based on Improved EGM and the Analysis of Typical Accident

作　　者：许飞[1] 王建国[1] 周文俊[1] 卫李静[1] 邓光武[1] 马斌[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《高压电器》2006年第3期205-207,共3页High Voltage Apparatus

摘　　要：提出了改进的电气几何模型,成功地解释了用原EGM法难以解释的现场事故原因。应用改进的电气几何模型分析了输电线路杆塔结构、避雷线和导线的布置、雷电流的幅值、地面倾角对绕击率的影响。结果表明,在地形复杂的山区,大电流也能对线路造成绕击。The improved electric geometrical model is proposed, and some on-site accidents are successfully explained, which are difficultly commented by EGM. With such model the effect of tower structure, lightning current amplitude, angle of the lightning incidence, as well as the ground angle on the shielding failure rate are analyzed, it is concluded that large lightning current can stride across lightning conductors to strike conductors under certain conditions in mountain areas.

关 键 词：输电线路 电气几何模型 绕击率 

分 类 号：TM75[电气工程—电力系统及自动化]