高电场下直流绝缘子表面积污特性研究  

Study on the Contamination Characteristics of DC Insulators Under High Electric Field

作　　者：王亚平 李智辉 阿思亚 刘岩 曹彬 WANG Yaping;LI Zhihui;A Siya;LIU Yan;CAO Bin(Inner Mongolia EHV Power Supply Bureau,Hohhot 010080,China;Tsinghua Shenzhen International Graduate School,Shenzhen 518055,China)

机构地区：[1]内蒙古超高压供电局,内蒙古呼和浩特010080 [2]清华大学深圳国际研究生院,广东深圳518055

出　　处：《山东电力技术》2024年第8期78-84,共7页Shandong Electric Power

基　　金：国家自然科学基金项目(52007095)。

摘　　要：绝缘子污秽闪络是电力系统的系统性灾难,是电网稳定运行的重大威胁。污秽的积聚过程是绝缘子污秽闪络的必要过程,而电场强度是影响绝缘子积污的重要因素。一般认为相同环境条件下,直流电场下的积污比交流更严重,并且污秽度会随着直流电压的升高而增加。然而,人工模拟积污试验结果表明,随着试验试品表面施加电压的升高,相同环境下,积聚在试品表面的污秽积聚量可能会达到饱和,甚至减小。为分析高场强下绝缘子表面积污规律,搭建小型积污环境模拟室,分析高直流电场下的绝缘子污秽度、上下表面积污比、带电/不带电积污比等随电场的变化。研究发现,当绝缘子的电场升高到一定程度时,伞裙表面污秽颗粒自身产生的电场会阻止绝缘子表面的继续积污。研究结果能够为绝缘子电场下的积污特性的研究提供参考。Insulator pollution flashover is a systematic disaster of the power system and a major threat to the stable operation of power grid.The pollution accumulation process is the necessary process of insulator pollution flashover,and the electric field strength is an important factor affecting insulator pollution accumulation.It is generally believed that under the same environmental conditions,the pollution deposit in the DC electric field is more serious than that in the AC field,and the pollution degree will increase with the increase of the DC voltage.However,artificial simulation contamination test results show that the contamination amount of insulator surface becomes saturated or even decreases as the applied voltage on the surface of the test specimen increases under the same environment.In order to analyse the pollution law of insulators surface under high field strength,a small pollution accumulation environment simulation chamber was built to analyse the changes of insulator contamination degree,pollution ratio of the top and bottom surfaces of the insulators,and charged/non-charged contamination ratio with the electric field under high DC electric field.It is found that when the electric field of insulators rises to a certain level,the electric field generated by the pollution particles on the surface of the shed will prevent the insulator from continuing accumulate pollution on the surface.The research results can provide a reference for the study of the contamination depositing characteristics of insulators under electric field.

关 键 词：绝缘子 污秽 直流电场 人工积污试验 

分 类 号：TM8[电气工程—高电压与绝缘技术]