表层非线性电导盆式绝缘子表面电荷分布与沿面放电特性  

Surface Charge Distribution and Discharge Behaviors of Basin Spacer With Surface Nonlinear Conductivity

作　　者：梁虎成 王雨帆 杜伯学 姜金鹏 王禹淮 李进 李忠华[3] LIANG Hucheng;WANG Yufan;DU Boxue;JIANG Jinpeng;WANG Yuhuai;LI Jin;LI Zhonghua(Key Laboratory of Smart Grid of Education Ministry(School of Electrical and Information Engineering,Tianjin University),Nankai District,Tianjin 300072,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education(Harbin University of Science and Technology),Harbin 150080,Heilongjiang Province,China)

机构地区：[1]智能电网教育部重点试验室(天津大学电气自动化与信息工程学院),天津市南开区300072 [2]中国电力科学研究院有限公司,北京市海淀区100192 [3]工程电介质及其应用教育部重点试验室(哈尔滨理工大学),黑龙江省哈尔滨市150080

出　　处：《中国电机工程学报》2022年第2期835-843,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(U1966203;51807136);工程电介质教育部重点试验室开放基金(哈尔滨理工大学)(KFY1804)。

摘　　要：盆式绝缘子表面电荷积聚是影响直流气体绝缘输电管道(direct current gas insulated transmission line,DC-GIL)电场分布与沿面闪络的重要因素,因此探究绝缘子表面电荷积聚机理并提出调控方法,进而改善绝缘子沿面电场分布具有重要意义。该文搭建缩尺直流GIL绝缘子试验平台,研究不同SiC质量分数(23.1%、37.5%、47.4%)的非线性电导涂层对直流电压、金属微粒附着和极性反转工况下盆式绝缘子表面电荷分布与沿面闪络特性的影响规律。结果表明:环氧基Al_(2)O_(3)绝缘子的表面电荷极性取决于气固侧电流密度博弈结果,具有显著的场强依赖特性;非线性电导涂层可以自适应调控直流GIL绝缘子的表面电荷与沿面电场分布,显著提高不同工况下的沿面闪络电压。该文的研究结果为高可靠性直流GIL绝缘子的研发提供了一种潜在的解决方案。The surface charge accumulation on the basin-type spacer significantly affects the electric field distribution and the flashover in the direct current gas insulated transmission line(DC-GIL).Therefore,it is of great significance to investigate and regulate the surface charge distribution on the spacer,thus improving the electric field distribution.Based on the experimental platform of a downsized DC-GIL,the influences of different nonlinear conductivity coatings(mass fraction of SiC:23.1%,37.5%and 47.4%)on the surface charging and discharging behaviors of the basin-type spacer were studied under different conditions,i.e.,DC,metal particle,and polarity reversal operation.Results show that the surface charge polarity on the epoxy/Al_(2)O_(3) spacer depends on the competition result between the bulk conduction and the gas conduction,which is significantly field-dependent.The surface nonlinear conductivity(SNC)spacers can adaptively regulate the surface charge and the electric field distributions,thus improving the flashover voltages under different operation conditions.This study provides a potential solution for developing novel DC-GIL spacers with high reliability.

关 键 词：直流气体绝缘输电管道 盆式绝缘子 表面电荷 电场分布 沿面放电 非线性电导 

分 类 号：TM216[一般工业技术—材料科学与工程]