摘要
基于先导发展模型,分析了±800 kV输电线路直线塔的雷电屏蔽性能,并研究了工作电压、杆塔高度、地形地貌和线路保护角的影响规律,结果表明,正极性工作电压使得最大绕击电流和绕击率增加,而负极性工作电压使得最大绕击电流和绕击率有所降低,但整体而言,考虑工作电压的线路绕击率高于不考虑工作电压的情况,前者约为后者的两倍;随着线路杆塔高度和保护角的增加,直流线路的雷电绕击跳闸率逐渐增大;大地平面朝着线路侧倾斜,会增强地面的屏蔽效应,使得雷电绕击线路的概率降低.考虑直流输电线路的实际参数,评估了四川省±800 kV锦-苏直流输电线路、±800 kV宾-金直流输电线路和±800 kV复-奉直流输电线路的雷电屏蔽性能,发现了直流输电线路的雷电屏蔽性能的极性效应,并获得了3条直流输电线路的高风险杆塔分布,为线路的防雷改造提供了指导.
The lightning shielding performance of±800 kV transmission line tower is analyzed based on the Leader Propagation Model.Study on the influences of the operating voltage,tower height,topography and protection angle of the line has been made.The results show that maximum shielding current and lightning shielding rate increase when considering the positive operation voltage,while decrease for the negative operation voltage.Overall,the lightning shielding rate considering the operation voltage is higher than that without considering the operating voltage,and the former is double compared to the latter.With the increase of the tower height and the protection angle,shielding failure flashover rate gradually increases.When the earth plane towards the transmission line,which will enhance the shielding effect of the ground,so that the probability of lightning striking reduce.Taking the actual parameters of DC transmission line into account,the lightning shielding performance of±800 kV Jing-Su transmission line,±800 kV Bing-Jin transmission line and±800 kV Fu-Feng transmission line in Sichuan Province are evaluated.The polar effect of the lightning shielding performance has been found according to the simulation results.The distribution of the high-risk tower of the three±800 kV transmission lines are obtained,which can provide guidance for the lightning protection of the transmission line.
作者
谢施君
曹树屏
罗蜀彩
张晨萌
张榆
欧平吉
XIE Shijun;CAO Shuping;LUO shucai;ZHANG Chenmeng;ZHANG Yu;OU Pingji(State Grid Sichuan Electric Power Research Institute,Chengdu 610095,China;State Grid Sichuan Maintenance Company,Chengdu 610095,China)
出处
《电瓷避雷器》
CAS
北大核心
2019年第4期87-93,共7页
Insulators and Surge Arresters
关键词
±800KV直流输电线路
雷电屏蔽性能
先导发展模型
工作电压
±800 kV DC transmission lines
lightning shielding performance
leader propagation method
operating voltage
