直流输电线路防雷侧针防护效果研究  

Study on the Protection Efficiency of Lightning Rod in DC Transmission Line

作　　者：高峰[1] 周利军[1] 曹晓斌[1] 邱璆[1] 张敏[1] 熊万亮[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《电瓷避雷器》2012年第6期56-61,共6页Insulators and Surge Arresters

摘　　要：随着电力系统电压等级的不断提高,雷电绕击成为高压及以上输电线路雷击跳闸故障的主要因素,且山区高压输电线路绕击更为严重。防雷电绕击侧针是对高压及以上电压等级输电线路绕击雷防护的改进措施。以某500 kV直流输电线路为例,分析并比较了一基G1型杆塔附近15~30 m范围内安装防绕击侧针前后,线路绕击率及绕击跳闸率的变化情况。基于电气几何模型计算了防绕击侧针对最大绕击雷电流幅值的影响。通过定量分析发现,防绕击侧针安装以后明显降低了高压线路绕击率及跳闸率,且在降低高压输电线路的绕击雷电流幅值同时,起到将绕击雷转变为高压系统可以承受的反击雷的目的。可见安装防绕击侧针作为已投运的高压及以上电压等级输电线路的防雷改造措施,具有较好的实用性。With the increase of power system voltage level,the trip-out accidents are mainly caused by shielding failure.And,it is more serious in mountain area.Lightning rod with the protection of shielding failure is an improvement measure of lightning protection for 35～220kV and higher grade transmission lines.Taking the ±500kV DC transmission systems for example,The differences of shielding failure rate and shielding failure trip-out rate of the transmission line before and after installed the Lightning rod with the protection of shielding failure near a G1 tower are analyzed.Based on EGM,the influence of lightning rod with the protection of shielding failure on lightning peak current is calculated.With the help of quantitative analysis,it can be found that when the lightning rod with the protection of shielding failure is installed,the shielding failure rate and trip-out rate of HV transmission lines decrease obviously.The shielding failure lightning peak current of HV transmission lines decreases.At the same time the shielding rod can turn the shielding failure stroke into back flashover which the HV system can bear.Therefore,it is in high practicality to use lightning rod with the protection of shielding failure as the improvement measures of lightning protection for HV and UHV transmission lines in operation.

关 键 词：防绕击侧针 绕击率 跳闸率 最大绕击雷电流 

分 类 号：TM862[电气工程—高电压与绝缘技术]