基于EGM的500 kV同杆双回线路绕击跳闸率研究  

Study on EGM-Based 500 kV Double-Circuit Lines Flashover Rate

作　　者：李长旭[1] 袁忠君[1] 张海龙[1] 

机构地区：[1]东北电力大学,吉林市132012

出　　处：《电力建设》2008年第2期15-18,共4页Electric Power Construction

摘　　要：采用EGM进行500kV同杆双回输电线路绕击跳闸率的计算。在计算中,引入了随杆塔高度h变化的击距系数,β以暴露弧为0时对应的雷电流作为雷电的最大绕击电流,并分析了地面倾角、杆塔结构等因素对各导线绕击跳闸率的影响。计算结果表明,随着地面倾角增大,绕击跳闸率先增大后减小;绕击跳闸率随避雷线横担增长而减小;各导线绕击跳闸率与杆塔结构的关系复杂,应分别计算分析,而不宜仅仅求得总绕击跳闸率,这样可以对绕击跳闸率较高的导线加强绝缘,以提高线路的耐雷水平。Flashover rate of 500 kV double-circuit line is calculated using EGM. In the calculation, flashover distance coefficient, β, which varies with pgle height, h, is introduced, and the lightning current at zero exposed arc is set to be the maximum flashover current, and the effects of factors, including ground inclination, pole structure, etc., on individual conductor tlashover rate are analyzed. Results show that as ground inclination increases, flashover rate initially increases, and then decreases; tlashover rate decreases as lightning wire cross -arm lengthening; the relationships between individual conductor flashover rate and pole structure are complex, requiring separated calculations, instead of calculating total flashover rate only, so that insulation of conductors with higher flashover rates can be strengthened to improve line lightning level.

关 键 词：500KV线路 同杆双回 绕击跳闸率 EGM 

分 类 号：TM863[电气工程—高电压与绝缘技术]