不同SF_6气压下不同填料环氧树脂绝缘子的直流闪络特性  

DC Flashover Characteristics of Epoxy Resin Insulator With and Without Fillers Under Different SF_6 Gas Pressures

作　　者：贾志杰[1] 范建斌[2] 李金忠[2] 张乔根[3] 

机构地区：[1]四川电力试验研究院,四川省成都市610072 [2]中国电力科学研究院,北京市海淀区100192 [3]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电网技术》2010年第8期155-159,共5页Power System Technology

基　　金：国家自然科学基金项目(50877073)~~

摘　　要：建立了锥板电极系统来模拟气体绝缘金属封闭输电线路(gas insulated transmission line,GIL)中同轴圆柱结构的电场分布,研究了直流下SF6中环氧树脂绝缘子的填料和形状对其闪络特性的影响,结果表明,直流GIL中填料为SiO2的环氧树脂绝缘子在短时加压和长期耐压试验中的绝缘性能都是最优良的。还介绍了基于锥板电极的直流GIL绝缘子外形结构优化的注意事项和绝缘子充电时间常数的近似求取方法。Gas insulated transmission line （GIL） can be used to substitute part of overhead transmission line or power cable under special environments to enhance the flexibility of choosing wansmission corridor. The key factor impacting the insulation level of GIL is the charge accumulation along the surfaces of support insulators in DC environment. In this paper, a cone-plate electrode assembly is built to simulate the electric field distribution of coaxial cylindrical structure inside the GIL under DC voltage and the impacts of the filler and the shape of epoxy resin insulator under different SF6 pressures in DC environment on its flashover characteristic are researched. Test results show that in DC GIL the epoxy resin insulator using SiO2 as the filler is indicative of the best insulation performance in short-term voltage impressing and long-term voltage withstanding tests. The points, which attentions should be paid to, in the optimization of contour structure of cone-plate electrode assembly based epoxy resin insulator for DC GIL and the method to approximately acquire charging time constant of insulator are proposed.

关 键 词：环氧树脂绝缘子 直流闪络特性 表面电荷积聚 闪络电压 表面电导率 时间常数 

分 类 号：TM85[电气工程—高电压与绝缘技术]