同杆双回路雷电绕击跳闸率计算方法的分析.pdf

2010 中国国际供电会议 (CICED 2010) 南京, 2010 年 9 月 20-23 日 同杆双回路雷电绕击跳闸率计算方法的分析 1 2 常美生 ，袁改莲 1.山西大学工程学院，山西 太原 030013；2.山西太原供电分公司 山西 太原 030012 Analysis for Calculation method of Shielding Flashover rate on Common-Tower double-Transmission Line 1 2 Chang Meisheng ，Yuan Gailian 1.Engineering College of Shanxi University, Taiyuan , China 030013; 2.Shanxi Taiyuan Electric Power Supply Company, Taiyuan ,China 030012 ABSTRACT: 保护弧 Based on the EGM(electric geometry method), A some problems when calculating the ratio of exposure arc to expo-sure arc and shielding arc, exposure arc B projection, striking distance coefficient, shielding 杆 避雷线 暴露弧 failure flashover rate etc are analyzed and discussed. It points out that the general maximum striking distance 塔 E D C formula is not appropriate for some conditions 中 Calculating shielding failure flashover rate by current 心 导线 density probability function is proposed; It also 线 suggested that three conductor use corresponding striking distance coefficient with the conductor height. KEY WORD: Double circuit transmission line; Electric geometry method ；Shielding failure; Shielding failure flashover rate 图1 雷击电气几何模型 摘要： 绕击率为一定时间内雷绕击到导线上 基于 EGM，对同杆双回路绕击跳闸率计算过程 的次数与雷击线路总次数的比值。绕击率的 中弧比值、暴露弧投影、击距系数、绕击跳闸率等 计算目前有两种方法，一种是求出某个击距 的计算问题进行了分析和探讨。指出了最大