川藏联网工程500kV高海拔输电线路的耐雷水平  

Lightning Protection Level for 500 kV High Altitude Transmission Lines in the Tibet Power Grid and Sichuan Power Grid Interconnection Project

作　　者：陈秀娟[1] 夏潮[1] 殷禹[1] 王成[2] 张亚迪[2] 梁明 

机构地区：[1]中国电力科学研究院,北京100192 [2]国家电网公司西南分部,成都610041 [3]中国电力工程顾问集团西南电力设计院有限公司,成都610021

出　　处：《高电压技术》2016年第5期1535-1540,共6页High Voltage Engineering

基　　金：川藏联网工程科研专题项目(GYB11201505023)~~

摘　　要：川藏联网工程是联结四川电网和西藏电网的重要民生工程,工程500 kV输电线路分为乡城—巴塘和巴塘—昌都这2个部分。线路经过地区年平均雷电日高达70 d,属于多雷区;沿线地形中高山大岭和峻岭约占80%;最高海拔高度达5 000 m;线路耐雷水平亟待研究。为此,对川藏联网工程沿线电网近几年的雷击跳闸情况进行了统计分析,对乡城—巴塘和巴塘—昌都500 kV输电线路的雷电性能进行了研究,给出了线路雷电绕击计算方法和反击计算方法,对线路雷击跳闸率进行了加权计算。计算结果表明,乡城—巴塘和巴塘—昌都这2段线路折算至40雷电日时的雷击跳闸率分别为0.24次/(100 km·a)和0.17次/(100 km·a),均大于500 kV输电线路0.14次/(100km·a)的控制要求值。鉴于川藏联网工程的重要性,为增大线路防雷的安全裕度,需要增设一些线路防雷措施。如在易击塔和易击相上加装线路避雷器,乡城—巴塘线路段的雷击跳闸率可由0.24次/(100 km·a)降低至0.13次/(100km·a),巴塘—昌都线路段的雷击跳闸率由0.17次/(100 km·a)降低至0.11次/(100 km·a),均可满足要求。研究结果可为川藏联网工程高海拔输电线路的设计和建设提供指导,对后续高海拔输电线路耐雷水平的提高具有重要意义。The Tibet power grid and Sichuan power grid interconnection project is an important livelihood project connecting Sichuan power grid and Tibet grid. 500 kV transmission line was divided into two parts. One is from Xiangcheng to Batang,another is from Batang to Changdu,where more lightning activities arise,and the highest elevation is 5 000 m. In order to research the lightning performances, we analyzed the lightning trip of the Tibet power grid and Sichuan power grid interconnection project in recent years,and researched the lightning performances of 500 kV transmission lines from Xiangcheng to Batang and lines from Batang to Changdu. Moreover, we put forward the calculation methods for lightning shielding failure and lightning strike, and calculated and statistically analyzed the lightning trip rate in detail. Calculation results indicated that lightning trip rates for such two lines were 0.24 and 0.17 time per 100 km annually, respectively,and two rates were more than 0.14 time per 100 km annually. In order to increase the lightning protection safety margin, it was needed to take some line lightning protection measures. If line arresters were installed on towers and phases, lightning trip rates of such two lines could be reduced to 0.13 and 0.11 time per 100 km annually. Research results can provide guidance for design and construction of transmission line in high altitude for Tibet network project, and have important significance for improving the lightning protection performance of transmission lines in high altitude.

关 键 词：川藏联网工程 雷电日 绕击 反击 雷击跳闸率 耐雷水平 

分 类 号：TM863[电气工程—高电压与绝缘技术]