缺陷对交流1100kV GIL三支柱绝缘子电场分布影响的仿真  

Simulation on Electric Field Distribution of 1100kV AC Tri-Post Insulator Influenced by Defects

作　　者：刘鹏[1] 吴泽华 朱思佳 徐家忠 刘庆东 彭宗仁[1] Liu Peng;Wu Zehua;Zhu Sijia;Xu Jiazong;Liu Qingdong;Peng Zongren(State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University,Xi’an 710049 China;Shandong Electrical Engineering&Equipment Group Co.Ltd,Jinan 250022 China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),西安710049 [2]山东电工电气集团有限公司,济南250022

出　　处：《电工技术学报》2022年第2期469-478,共10页Transactions of China Electrotechnical Society

基　　金：国家电网公司科技资助项目(SGZJ0000KXJS1900410)。

摘　　要：缺陷及导电微粒会严重畸变气体绝缘金属封闭输电线路(GIL)用三支柱绝缘子的电场分布,甚至引发击穿、放电故障。该文分析特高压(UHV)GIL内可能存在的缺陷及来源,应用有限元仿真软件COMSOL研究了界面缺陷、内部气泡和导电颗粒对三支柱绝缘子电场分布的影响。结果表明,嵌件界面剥离和中心导体气隙对绝缘子电场分布有着相似的影响规律,其延伸长度越长,缺陷宽度越窄,则绝缘子表面最大电场强度越高。内部气泡对电场分布的影响与尺寸基本无关,但与其位置相关,越靠近金属嵌件对电场的影响越严重。附着导电颗粒会显著增强周围电场,其尺寸越大、电场畸变的范围越大,但对最大电场强度值影响较小;悬浮导电颗粒的尺寸越大,距离三支柱绝缘子表面的垂直距离越小,在三支柱绝缘子表面引发的电场畸变越严重;电场强度最大值随着导电颗粒靠近绝缘子腹部中心而增大。此外,所研究的几类缺陷中,附着导电颗粒对三支柱绝缘的危害最大,其次为界面缺陷。Defects and conductive particles will seriously distort the electric field distribution of tri-post insulators in GIL,and even lead to breakdown.In this paper,the possible defects and their sources in UHV GIL were analyzed,and the influence of defects,including interface defects,inner void and conductive particles,on the electric field distribution of the tri-post insulator was calculated by the COMSOL Multiphysics software.The results show that interface defects on metal insert and center conductor surface have the similar effects.The longer and thinner the interface defects are,the higher the maximum value of field is.As for the inner voids,the size seems to have small impact on the electric field distribution,but the location closer to the metal insert has more damage to the insulation.Attached conductive metal particles can significantly enhance the electric field,but has influence on the maximum electric field value,and the larger the size,the larger the range of electric field distortion.The larger size and shorter height of suspended conductive particles cause more serious distortion,and the maximum value of field strength increases when the particles are closer the sphere zone.Among the defects,conductive particles are the most harmful to insulation,followed by interface defects.

关 键 词：特高压(UHV) 气体绝缘金属封闭输电线路(GIL) 三支柱绝缘子 界面缺陷 内部气泡 导电颗粒 

分 类 号：TM216[一般工业技术—材料科学与工程]