大跨越特高杆塔线路防雷设计中EGM的应用  

Application of EGM in Lightning Protection Design of Transmission Line with Ultra-high Tower and Great Span

作　　者：陈稼苗[1] 钟一俊[2] 劳建民[1] 朱天浩[1] 周浩[3] 张利庭 王坚敏[5] 

机构地区：[1]浙江省电力设计院,杭州310014 [2]浙江省电力公司,杭州310007 [3]浙江大学电气工程学院,杭州310027 [4]浙江省嘉兴电业局,嘉兴314033 [5]浙江省宁波电业局,宁波315010

出　　处：《高电压技术》2008年第7期1374-1378,共5页High Voltage Engineering

摘　　要：为确保大跨越特高杆塔的耐雷可靠性,在经典电气几何模型(EGM)的基础上,利用击距理论计算了线路等效受雷宽度,并利用改进的电气几何模型计算了大跨越特高杆塔线路的绕击跳闸率。计算中分析击距公式、击距系数、雷电先导入射角对线路受雷宽度和绕击跳闸率影响的结果表明,在大跨越特高杆塔线路的情况下,利用击距法计算的受雷宽度远远小于规程法所得结果,击距系数越大,线路受雷宽度越小,EGM法计算所得绕击跳闸率相应越小。计算结果可为设计线路部门提供依据。To guarantee the lightning protection reliability of transmission line with ultra-high tower and great span, on the basis of the classical electric geometry method （EGM）, lightning strike width of transmission line is calculated with the striking distance theory, Then the lightning strike trip-out rate of transmission line with ultra-high tower and great span is calculated with improved EGM, With such model the effects of striking distance expression, striking distance factor, angle of lightning incidence on lightning strike width and lightning strike trip-out rate are analyzed, For transmission line with ultra-high tower and great span, it is concluded that the lightning strike width based on striking distance theory is much smaller than the calculation result based on regulation method, And the resuits show that the lightning strike trip-out rate reduces with the reduction of lightning strike width and increase of striking distance factor.

关 键 词：大跨越 电气几何模型 受雷宽度 击距 雷电先导入射角 绕击跳闸率 

分 类 号：TM754[电气工程—电力系统及自动化]