不同表面状态下复合绝缘子空间电场分布特性研究  

Study on the Spatial Electric Field Characteristics of Composite Insulators under Different Surface Conditions

作　　者：杜伟 于鑫悦 王阳阳 余波明 张东东 DU Wei;YU Xinyue;WANG Yangyang;YU Boming;ZHANG Dongdong(Huai’an Power Supply Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Huaian Jiangsu 223001,China;Nanjing Institute of Technology,Nanjing 215000,China)

机构地区：[1]国网江苏省电力有限公司淮安供电分公司,江苏淮安223001 [2]南京工程学院电力工程学院,南京215000

出　　处：《自动化与仪器仪表》2024年第10期110-114,共5页Automation & Instrumentation

基　　金：国家自然科学基金(No.52077018);南京工程学院高层次引进人才科研启动基金(YKJ201819);江苏省配电网智能技术与装备协同创新中心开放基金(XTCX201902)。

摘　　要：运行电压下的绝缘子易受户外恶劣环境的影响,而产生局部放电与电弧,甚至形成全面闪络,引发污闪事故。通过空间电场E的在线监测有望成为复合绝缘子污染过程监测与预警的有效手段,但现阶段缺乏对闪络发展过程中空间电场特性的基础理论研究。因此,以FXBW4-110/120复合绝缘子为例,考虑不同湿污状态及局部电弧,建立了空间电场计算有限元模型。系统研究了复合绝缘子污层润湿及电弧发展重要阶段的空间电场特性。研究结果表明:干污、湿污、局部放电三种状态下,复合绝缘子空间电场幅值沿串分布有明显区别,且其空间电场幅值变化率十分明显,例如干污状态下,绝缘子串的空间电场分布无明显改变。但当湿污染增加、产生沿面放电时,E值整体增加。并且研究发现绝缘子接地端是感知整个过程E值最优位置,因此,通过监测绝缘子接地端E值,进行复合绝缘子污染过程监测及污闪发展程度是有效手段。研究结果可望为进一步揭示污闪机理,并为输配电外绝缘运行状态监测提供新的技术支撑。Insulators under operating voltage are easily affected by harsh outdoor environments,resulting in partial discharge and arc,and even comprehensive flashover,leading to pollution flashover accidents.The online monitoring of space electric field E is expected to become an effective means for monitoring and warning the pollution process of composite insulators,but at present,there is a lack of basic theoretical research on the characteristics of space electric field during the development of flashover.Therefore,this article takes FXBW4-110/120 composite insulator as an example,considering different wet pollution states and local arc,and establishes a finite element model for calculating spatial electric field.A systematic study was conducted on the spatial electric field characteristics during the important stages of wetting and arc development of composite insulators.The research results indicate that there are significant differences in the distribution of the spatial electric field amplitude of composite insulators along the string under the three states of dry pollution,wet pollution,and partial discharge,and the change rate of the spatial electric field amplitude is very obvious.For example,in the dry pollution state,there is no significant change in the spatial electric field distribution of the insulator string.But when wet pollution increases and surface discharge occurs,the overall E value increases.And research has found that the grounding end of the insulator is the optimal location for sensing the entire process E value.Therefore,monitoring the E value of the grounding end of the insulator is an effective means to monitor the pollution process of composite insulators and the degree of pollution flashover development.The research results are expected to further reveal the mechanism of pollution flashover and provide new technical support for monitoring the operation status of external insulation in power transmission and distribution.

关 键 词：有限元仿真 污秽绝缘子 空间电场 表面状态 

分 类 号：TP202[自动化与计算机技术—检测技术与自动化装置]