同塔双回超高压输电线路绕击耐雷性能影响因素分析  

Analysis of Influencing Factors on Shielding Failure Lightning Protection Performance of Double-Circuit EHV Transmission Lines on the Same Tower

作　　者：董铭星 李浩 汪涛 DONG Mingxing;LI Hao;WANG Tao(Zhifang Design Co.,Ltd.Wuhan Branch,Wuhan 430000,China)

机构地区：[1]智方设计股份有限公司武汉分公司,湖北武汉430000

出　　处：《通信电源技术》2023年第2期83-86,共4页Telecom Power Technology

摘　　要：超高压(Extra High Voltage,EHV)输电线路多为同塔双回,引雷面积大,更易遭受到雷击,特别是对于山谷间大跨度的杆塔常发生绕击跳闸事故。据运检单位统计表明,绕击是引起线路跳闸的主要原因。因此,对输电线路雷电绕击进行分析,探讨影响同塔双回输电线路防雷性能的敏感因素是十分必要的。建立500 kV输电线路的绕击模型,该模型采用电气几何模型(Electrical Geometric Model,EGM)法,通过呼高、地面坡度、保护角、导线相序排列变化所导致的雷电绕击跳闸次数变化来反映出各因素对于绕击耐雷性能的影响。At present,Extra High Voltage(EHV)transmission lines are mostly double circuits on the same tower,which have a large lightning area and are more vulnerable to lightning strikes.Especially for long-span towers between valleys,shielding failure and tripping accidents often occur.According to the statistics of transportation inspection units,shielding failure is the main cause of line tripping.Therefore,it is very necessary to analyze the lightning shielding failure of transmission lines,and to study and analyze the sensitive factors that affect the lightning protection performance of double-circuit transmission lines on the same tower.In this paper,the shielding failure model of 500kV transmission lines is established,which is based on Electrical Geometric Model(EGM)method.The changes of call height,ground slope,protection angle and conductor phase sequence arrangement lead to the changes of lightning shielding failure trips,reflecting the influence of various factors on shielding failure lightning performance.

关 键 词：超高压(EHV) 架空输电线路 雷击 耐雷性能 保护角 电气几何模型(EGM) 

分 类 号：TM863[电气工程—高电压与绝缘技术]