特高压同塔双回路转角耐张塔雷电绕击防护  

Lightning Shielding Failure Protection of the Strained Angled Tower of Double Circuit UHV AC Transmission Lines

作　　者：贺恒鑫[1] 陈维江[2] 殷禹[3] 葛栋[2] 张翠霞[3] 何俊佳[1] 

机构地区：[1]华中科技大学强电磁工程与应用国家重点实验室,武汉430074 [2]国家电网公司,北京100031 [3]中国电力科学研究院,北京100192

出　　处：《高电压技术》2016年第11期3448-3455,共8页High Voltage Engineering

基　　金：国家电网公司科技项目(GY71-14-064;GC71-14-002)~~

摘　　要：我国特高压变电站进线段同塔双回转角耐张塔采用刚性跳线,使得地线对跳线端部的保护角偏大,可能增加转角耐张塔的雷电绕击风险。为降低雷电绕击对变电站设备安全的影响,建立了特高压同塔双回路耐张转角塔雷电绕击先导发展3维模型。通过计算分析地线、跳线和导线最易产生上行先导的位置,获得了不同线路转角和地线横担长度时,刚性跳线的最大绕击电流和绕击闪络率。结果表明:只需控制地线对相邻档距导线的保护角满足≤–5°,即可保证刚性跳线单回闪络率满足≤0.1次/(100km·a)的要求,而无需对刚性跳线端部的保护角进行控制;SJ322P型杆塔外角侧地线横担长度可由电气几何模型推荐的36 m减小至28 m,内角侧地线横担长度可由27 m减小至25 m。相关分析结论已应用于1 000 kV锡盟—胜利特高压交流输电工程线路防雷设计。Rigid jumper is usually adopted in the double-circuit strain angled tower of the domestic UHV substation incoming line, thus the risk of lightning shielding failure may increase because of the increasement of the protection angle at the rigid jumper extremities. In order to ensure the operation safety of the UHV substation, we put forward a three-dimensional leader progress model for the lightning shielding performance estimation of the double-circuit UHV AC strained angled tower. The lightning strike vulnerability locations where might have a higher probability to launch the upward leader were identified for the phase conductors, the rigid jumper, and the ground wire, respectively. The maxi- mum lightning shielding failure current and shielding failure rate （SFFOR） under different protection layout were estimated. The results show that the SFFOR of rigid jumper will be blow 0.1 times/（100 km·a） when the protection angle of phase conductor is ≤-5°. It is referred that the protection angle of the rigid jumper extremities is not an essential factor. Compared to the prediction of EGM, the cross ann length for the outer side ground wire of SJ322P tower can be reduced from 36 m to 28 m, and for the inner side ,it can be reduced from 27 m to 25 m. Relevant results has been adopted in the lightning protection design of Ximeng to Shengli 1 000 kV UHV AC transmission project.

关 键 词：特高压交流 转角耐张塔 雷电绕击 3维先导模型 刚性跳线 上行先导 

分 类 号：TM863[电气工程—高电压与绝缘技术]