架空输电线路并联间隙防雷装置电弧磁场力计算研究  

Magnetic Force Computation for the Electric Arc of Parallel Gap Lightning Protection Device on Overhead Transmission Lines

作　　者：谷山强[1] 何金良[1] 陈维江[2] 徐国政[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084 [2]中国电力科学研究院,北京市海淀区100085

出　　处：《中国电机工程学报》2006年第7期140-145,共6页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费项目(2004CB217906);国家杰出青年科学基金(50425721)。~~

摘　　要：在架空输电线路上安装并联间隙防雷装置,能够在线路遭遇雷击或绝缘子串工频闪络时有效地保护绝缘子串免受工频电弧的灼烧。在并联间隙或绝缘子表面上产生的工频电弧处在由流过架空线路、并联间隙装置和杆塔的电流以及电弧本身电流产生的综合磁场中,受到磁场力的作用而运动。该磁场力决定着电弧的运动方向和速度,从而决定着绝缘子是否能够避免受到电弧的灼烧而得到有效的保护。针对高压输电线路的实际情况,结合新颖实用的电弧模型,开发了计算电弧所受磁场力的实用方法和程序,并以110kV架空输电线路并联间隙防雷装置为例进行计算和分析,结果和试验现象比较吻合。文中工作为进一步优化设计并联间隙防雷装置打下了基础。The parallel gap lightning protection device （PGLPD） is installed on overhead transmission lines to protect insulator strings against being burnt by power frequency electric arc when the lines meet lightning strokes or power frequency flashover of insulator. The electric arc is driven to move by the combined magnetic force produced by the current flowing through overhead transmission lines, the PGLPD, the tower and the arc itself. The magnetic force determines the direction and velocity of the arc＇s movement, therefore determines whether the insulators are efficiently protected or net against being burnt by the arc. Taking the actual high voltage transmission lines into account and based on a practical arc model, a practical procedure is developed to compute the magnetic force of the arc. The PGLPD for 110 kV overhead transmission line are computed and analyzed as an example, and the results have a good consistency with the experimental results. The research will lay the foundation for optimally design the PGLPD.

关 键 词：绝缘子 并联间隙防雷装置 电弧 磁场力 

分 类 号：TM63[电气工程—电力系统及自动化]