线路终端杆塔装设避雷器对变电站的保护效果及影响因素

Protective Effect of Arresters Installed at Terminal Tower on Substation and Influencing Factors

我国部分已建成的敞开式变电站为防止侵入波事故的发生,采取了在架空线路终端杆塔上加装避雷器的保护措施。为研究加装在线路终端杆塔上的避雷器对变电站的保护效果,利用ATP-EMTP建立了相应的仿真模型,计算了线路终端避雷器对侵入变电站的过电压的抑制作用,并结合线路终端杆塔的安装条件,分析了避雷器的保护距离,以及影响避雷器保护效果的几项因素。结果表明:安装在线路终端杆塔上的避雷器同样能对变电站的电气设备进行良好的保护,但线路终端避雷器具有一定的保护距离;线路终端杆塔的线路绝缘水平以及杆塔的接地电阻对线路终端避雷器保护效果的影响不大。

In order to prevent the occurrence of the invasion wave accident which happens in some of the complete open substations in China,a measure has been adopted to install arresters at terminal towers. For studying the protection effect of the arresters installed on terminal towers,corresponding simulation models are built based on ATP-EMTP to analysis the mitigation of line terminal arresters on the invasion voltage of substations. The arrester＇s protection distance and several factors influencing protection effect are analyzed considering the actual situation of the terminal tower＇s installation condition. The results showthat the arrester installed on line terminal tower can also protect the substation＇s electrical equipment,but the arrester has certain protective distance,the line＇s insulation level and tower grounding resistance have a limited impact on the protective effect of the arrester installed on the terminal tower.