工频高压持续时间对不同湿度复合绝缘子芯棒劣化影响研究  

Effect of Power Frequency High Voltage Applied Time on Deterioration of Composite Insulator Core Rod in Different Humid Environment

作　　者：刘辉 沈浩 符一凡 马新明 章敏俊 杨福兴 廖敏夫[2] LIU Hui;SHEN Hao;FU Yifan;MA Xinming;ZHANG Minjun;YANG Fuxing;LIAO Minfu(State Grid Shandong Electric Power Research Institute,Jinan 250003,China;Dalian University of Technology,Dalian 116024,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003 [2]大连理工大学,辽宁大连116024

出　　处：《绝缘材料》2022年第7期87-92,共6页Insulating Materials

基　　金：国网山东省电力公司科技项目(2020A-140)。

摘　　要：复合绝缘子已经在输电线路中得到了大规模应用,近些年出现许多由芯棒劣化引起的电网事故,亟需探明影响复合绝缘子芯棒劣化的因素及影响规律。为了研究匀强电场下不同加压时间和湿度环境对复合绝缘子芯棒劣化的影响规律,首先仿真分析了采用介质阻挡放电方式产生的电场分布情况。设计搭建了电老化试验平台,对干燥条件和潮湿条件下芯棒试样开展200、400、800 h的工频电老化试验。对全新试样和老化试样的材料学特性进行检测,分析相应的影响规律。结果表明:经过电老化后,芯棒中的环氧树脂含量降低。当老化时间小于400 h时,潮湿与干燥条件下的环氧树脂含量差距不大,当老化时间增加到800 h时,潮湿条件下的环氧树脂含量明显低于干燥条件。Composite insulators have been widely used in power transmission lines.In recent years,there are many grid accidents caused by insulator core rod deterioration.It is urgent to find out the influence factors and rules of composite insulator core rod deterioration.In order to study the influences of different voltage applied time and environmental humidity on the core rod deterioration of composite insulator under uniform electric field,the electric field distribution generated by the dielectric barrier discharge method was simulated and analyzed.An electrical ageing experiment platform was designed and built,and the core rod samples were conducted 200 h,400 h,and 800 h of electrical ageing tests at power frequency under dry and humid environments.The physical and chemical properties of new sample and the aged samples were tested,and the corresponding influence laws were analyzed.The results show that after electrical ageing,the epoxy resin content in the core rod decreases.When the ageing time is less than 400 h,the epoxy resin content under humid and dry environments has little difference.When the ageing time increases to 800 h,the epoxy resin content under humid environment is significantly lower than that under dry environment.

关 键 词：复合绝缘子 环氧树脂 芯棒劣化 电老化 

分 类 号：TM216[一般工业技术—材料科学与工程]