110kV和220kV架空线路并联间隙防雷保护研究

Development of Parallel Gap Lightning Protection Device for 110 kV and 220 kV Overhead Lines

研制了适用于我国110kV、220kV架空输电线路的并联间隙防雷保护装置,用于减小雷击闪络后工频续流电弧对绝缘子和金具的损坏。对该装置的雷电冲击特性和工频电弧燃弧特性进行了试验研究,计算了绝缘子串的电压、电场分布和线路雷击跳闸率,分析了50%雷击放电电压与间隙距离的关系。在此基础上,优化了装置的设计,给出了电极设计尺寸的系列表格,以便工程技术人员可根据绝缘子片数以及线路跳闸率来选择并联间隙的尺寸。

To reduce the damage of insulators and fittings caused by power frequency follow current after lightning flashover, a parallel gap lightning protection device for 110 kV and 220kV overhead transmission lines was developed. With this device the lightning impulse flashover and power frequency arc characteristics were investigated and the voltage distribution along insulator strings and trip out rate of transmission lines with the device are calculated. As a function of gap distance, the fifty percent lightning-stroke flashover voltage Was analyzed. Based on above studies the design of the device was improved, serial tables of electrode＇s design dimension were given, and the specimens were provided, so that engineers and technicians could select the dimension of the parallel gap according to insulator pieces of the strings and lightning-stroke trip-out rate of transmission lines.