一种提高山区500 kV输电线路耐雷水平的新方法

为了提高山区500kV输电线路耐雷水平，提出了在易遭受绕击的边相安装单支线路悬挂式金属氧化物避雷器、在另外一个边相增加绝缘子片数的不平衡绝缘方法．通过理论分析和电磁暂态计算程序EMTDC的仿真，证明了这种方法可以有效地提高输电线路的耐雷水平，使得绝缘子的闪络概率降低了90％左右，同时增加的投资仅为安装3支避雷器的33％，具有较高的经济效益．

Novel Approach to Enhance Lightning Withstanding Level of 500 kV Transmission Line Along Mountain Sides

To enhance lightning withstanding level of 500 kV transmission line along mountainsides,a novel approach was proposed.The efficiency and economy of this method was approved by the theoretical analysis and the result of simulation.By equipping a single metal-oxide surge arrestor(MOA) on the outside phase easy to be struck by lightning and the unbalanced insulation by increasing the length of insulator on the other outside phase,the transmission line withstanding level was greatly enhanced and the flashover rate of the insulators was reduced by about 90%,while the increased investment was only 33% of the traditional method by equipping three MOAs.