压缩气流灭弧条件下配网线路雷击跳闸率计算  

Calculation of lightning strike tripping rate of distribution line under condition of CDPD

作　　者：张奇星 李籽剑 张强 Zhang Qixing;Li Zijian;Zhang Qiang(School of Electrical Engineering,Guangxi University Nanning 530004,China;State Grid Electric Power Research Institute,State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430000,China;Wuhan Metro Resources Management Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]广西大学电气工程学院,南宁530000 [2]国网湖北省电力有限公司电力科学研究院,武汉430000 [3]武汉地铁资源经营有限公司,武汉430000

出　　处：《电测与仪表》2022年第7期64-71,共8页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51467002)。

摘　　要：压缩气流灭弧防雷间隙是一种冲击电弧诱导型灭弧防雷装置,它通过灭弧管道的特殊排列结构使得冲击电弧能够被优先吸引进入在压缩管道内并形成压力梯度产生自膨胀气流,在各个相邻灭弧管道拐点处粉碎性截断电弧直至电弧熄灭。为了计算在安装压缩气流灭弧防雷间隙后的雷击跳闸率,文中根据并联间隙与绝缘子串的放电电压分布特性得出了灭弧防雷装置的有效保护系数,通过数理统计的方法处理了试验数据,得出了安装压缩气流灭弧防雷间隙后配网线路上的建弧率,同时建立了压缩气流灭弧防雷间隙下的雷击跳闸计算模型。通过算例计算了某线路在安装灭弧装置前后的雷击跳闸率,通过数据分析可知安装压缩气流灭弧防雷间隙后有效降低了雷击跳闸率。CDPD is an impact arc inducing arc extinguishing lightning protection device. Through the special arrangement structure of the arc extinguishing pipeline, the impact arc can be preferentially attracted into the compression pipeline and form a pressure gradient to generate a self-expansion air flow. The arc is comminuted at the inflection point of each adjacent arc extinguishing duct until the arc extinguishes. In order to calculate the lightning strike tripping rate after the arc extinguishing and lightning protection gaps are installed, the effective protection factor of the arc extinguishing lightning protection device is firstly obtained based on the discharge voltage distribution characteristics of the parallel gap and the insulator string, the test data is processed by the mathematical statistics method to obtain the arc rate of distribution network line after installation of compressed air flow arc extinguishing and lightning protection clearance, meanwhile, the calculation model of lightning stroke tripping under the arc extinguishing and lightning protection gap of compressed air is established. The lightning tripping rate before and after the arc extinguishing device is installed on a line is calculated through an example. It can be seen that the installation of the compressed gas arc extinguishing and lightning protection gap effectively reduces the lightning strike tripping rate through data analysis.

关 键 词：压缩气流灭弧防雷间隙 灭弧率 保护系数 雷击跳闸率 

分 类 号：TM863[电气工程—高电压与绝缘技术]