输电线路保护用有串联间隙避雷器间隙特性的研究  

Study on Gap Performance of Line Surge Arrester with Series Gap

作　　者：何计谋[1] 洪波[2] 李亚东 高歌 

机构地区：[1]西安电瓷研究所,陕西西安710077 [2]安庆供电局供电公司,安徽安庆246003 [3]商洛供电局市区分局,陕西商洛726000 [4]西安送变电公司,陕西西安710032

出　　处：《电瓷避雷器》2006年第4期25-29,共5页Insulators and Surge Arresters

摘　　要：采用线路避雷器进行防雷保护是输电线路防雷的重要措施。通过对220kV输电线路用有串联间隙避雷器绝缘配合及结构的研究分析,提出了线路避雷器的技术参数及串联间隙的设计原则,确定了线路避雷器的间隙结构。对两种类型的220kV绝缘子串和避雷器进行了雷电冲击放电特性试验,结果表明:线路避雷器与绝缘子串的正极性雷电冲击50%放电电压的配合系数为1.39;线路避雷器与绝缘子串的负极性雷电冲击50%放电电压的配合系数为1.34,其配合系数大于1.18,对绝缘子串保护的有效率超过99.993%;线路避雷器正极性雷电冲击放电伏秒特性曲线至少比绝缘子串的低16%,线路避雷器负极性雷电冲击放电电压伏秒特性曲线至少比绝缘子串的低15%。220kV避雷器的放电特性满足了线路绝缘配合的要求,实现了对不同类型的绝缘子串的保护。It is an important measure to use the line arresters for protecting transmission lines from lightning strikes. With analysis of the insulation-coordination and configuration of line arresters with series gap in 220 kV transmission lines, the technical parameters of line arresters, the design principle and configuration of series gaps were determined. Lightning impulse discharge performance test on two types of 220 kV insulator strings and arresters were made, the result shows that the coordination factor of the positive lightning impulse discharge voltage for insulator strings and arresters is 1.39, whereas that of the negative lightning impulse discharge voltage is 1.34. The synthetic coordination factor is more than 1.18. The insulator protection effectiveness is beyond 99.993%. The positive lightning impulse discharge Voltage-Time curve of line arresters is less 16% than that of insulators string. The negative lightning impulse discharge Voltage-Time curve of line arresters is less 15% than that of insulators string. The discharge characteristics of 220 kV arresters meet the requirement of line insulation- coordination, providing satisfactory protection for insulator strings of different types.

关 键 词：避雷器 绝缘子串 串联间隙 放电特性 绝缘配合 

分 类 号：TM773[电气工程—电力系统及自动化] TM862