高海拔地区±800kV直流玻璃绝缘子污闪特性研究

Study on ±800 kV DC Flashover Characteristics of Glass Insulator in High Altitude Area

为了解决特高压输电线路中的外绝缘问题,通过对大吨位玻璃绝缘子在不同盐密、不同灰密、不同染污情况下进行直流污闪特性试验,对其污闪特性进行了研究。试验表明:玻璃绝缘子和瓷绝缘子直流污闪特性相似;盐的大小、灰的大小及污秽分布情况对大吨位瓷绝缘子直流污闪特性影响较大。

A series of DC flashover tests of glass insulators under different ESDD, NSDD and contamination conditions were conducted to understand external insulation of ultra high voltage DC transmission lines and the flashover characteristics of glass insulators. The porcelain insulators were tested in the same conditions for comparison. The results indicate that the flashover characteristics of glass insulators are similar to those of porcelain insulators; the size of ESDD and NSDD and distribution of contamination impose significant effects on the flashover characteristics of porcelain insulator.