高电压技术2013，Vol.39Issue(2)：374-382,9.DOI:10.3969/j.issn.1003-6520.2013.02.018
输电线路绕击特性的三维分析方法
Three-dimensional Analysis Method of Shielding Failure Characteristics of Transmission Lines
摘要
Abstract
In order to quantitatively analyze the numerical distribution characteristic of lightning probability and shielding failure trip-out rate in different position of transmission lines, and to avoid the uncontrollable error resulting from inequivalent replacement of lightning probability of each section, using the catenary equation, we expanded the lightning exposed width of traditional calculation method to three-dimensional exposed space alone every span of transmission lines, and proposed a three-dimensional analysis method of shielding failure characteristics of transmission lines and a three-dimensional calculation method of exposed width of arbitrary section in exposed space. Then, we derived the three-dimensional equations of lightning probability and shielding failure trip-out rate of arbitrary section, and revised the equations of total shielding failure trip-out rate. Moreover, taking 500 kV transmission lines with two overhead ground wires as an example, we calculated the three-dimensional distribution of lightning exposed width as well as the two-dimensional distribution of lightning probability and shielding failure trip-out rate. The results show that the maximum of shielding failure trip-out rate in a span is 9. 02 times more than the minimum, and 2. 54 times more than the total shielding failure trip-out rate calculated by original formulas. This method indicates that the lightning probability in diverse section is very different and that the total shielding failure trip-out rate can not really reflect the actual lightning stroke in arbitrary section of transmission lines.关键词
电气几何模型法/平均高度/暴露宽度/暴露空间/雷击概率/绕击跳闸率Key words
electro-geometric model (EGM)/ average height/ exposed width/ exposed space/ lightning probability/ shielding failure trip-out rate引用本文复制引用
吴广宁,熊万亮,曹晓斌,李瑞芳,朱军..输电线路绕击特性的三维分析方法[J].高电压技术,2013,39(2):374-382,9.基金项目
国家电网公司科技项目(2011-WG-4) （2011-WG-4）
教育部中央高校基本科研业务费专项资金(SWJTU11CX035). （SWJTU11CX035）
