染污绝缘子放电空间电场时频特性研究  

Time and Frequency Domain Characteristics of Spatial Electric Field During the Discharge of Polluted Insulator

作　　者：张东东 罗威 黄宵宁[1] 张志劲[2] 韩学春 Zhang Dongdong;Luo Wei;Huang Xiaoning;Zhang Zhijin;Han Xuechun(School of Electric Power Engineering Nanjing Institute of Technology,Nanjing 211100 China;State Key Laboratory of Power Transmission Equipment Technology Chongqing University,Chongqing 400044 China;State Grid Jiangsu UHV Company,Nanjing 211102 China)

机构地区：[1]南京工程学院电力工程学院,南京211100 [2]输变电装备技术全国重点实验室(重庆大学),重庆400044 [3]国网江苏超高压公司,南京211102

出　　处：《电工技术学报》2024年第9期2873-2886,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(52077018);国网江苏省电力有限公司科技项目(J2022097)资助。

摘　　要：恶劣气象条件地区的污闪事故时有发生,而目前对污秽外绝缘放电机制的理解还不够全面。为揭示污秽绝缘子放电空间电场特性,该文提出了一种新的污闪预警方法。在前期研究基础上,开展了染污绝缘子放电空间电场波形监测试验,重点研究了空间电场波形的时频特征参量。对于时域特征,对空间电场信号有效值、峰峰值、峰值因子三个时域特征量进行了研究,获得了其与盐密、绝缘子闪络状态的关系;对于频域特征,对空间电场信号进行傅里叶分解,获得了不同试验条件下的频谱图,发现发生闪络时,绝缘子空间电场信号中谐波分量占比升高,并提出可用三次谐波因子来描述绝缘子污闪放电发展程度。研究成果可进一步揭示污闪放电机制,并为解决恶劣环境下输电线路污闪预警的实际工程问题提供技术支撑。Transmission corridors inevitably cross complex environmental areas such as coastal,industrial,and heavily polluted areas,resulting in ongoing pollution flashover accidents.With the development of technology,emerging non-contact pollution monitoring technologies have been continuously proposed,but a unified consensus has not yet been formed.At present,the main problems in non-contact pollution monitoring of insulators are as follows.First,difficult to implement on site.Methods such as visible light method,sound wave method,etc.,are greatly affected by external factors such as noise,radiation,perspective,etc.,and greatly limited in on-site use.Second,the characterization ability is weak.The essence of insulator string pollution flashover is a complex dynamic electrical process.However,the existing methods are based on non-electrical quantities,such as color,light waves,etc.,which can only statically characterize a certain piece or part of pollution,and have poor correlation with the overall pollution of the insulator string.In order to enrich the means of non-contact monitoring and pollution flashover prewarning for insulators,and to reveal the mechanism of pollution flashover discharge at a different level,this paper established a space electric field monitoring platform for polluted insulator discharge.With the help of artificial fog chamber to simulate operating environment,the short insulator string was used as the test object to carry out the pollution withstand tests.During the tests,the method of first applying voltage and then wetting was used,and the electric field signal at fixed point near the low-voltage end cross arm of the string was monitored.Through the test data,the spatial electric field signal waveform characteristics under different pollution levels and different discharge development stages were analyzed,and its time-frequency domain characteristic parameters were extracted and systematically studied as well.The research results indicate that the spatial electric field signal near the low-volt

关 键 词：绝缘子 污秽 非接触式监测 空间电场 时频特性 污闪预警 

分 类 号：TM216[一般工业技术—材料科学与工程]