复合绝缘子酥朽发热老化的原因分析  

Reason Analysis of Decay-Like Aging for Composite Insulator

作　　者：卢明 张中浩[2] 李黎[3] 刘泽辉 华奎 杨晓承 LU Ming1, ZHANG Zhonghao2, LI Li3, LIU Zhehui1, HUA Kui3, YANG Xiaocheng4(1. State Grid Henan Electric Power Research Institute, Zhengzhou 450052, Henan Province, China; 2. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong Province, China; 3. School of Electrical and Electronic Engineering, Huazh0ng University of Science ＆ Technology, Wuhan 430074, Hubei Province, China; 4. Wuhan Data-Cloud Information Technology Limited Company, Wuhan 430069, Hubei Province, Chin)

机构地区：[1]国网河南省电力公司电力科学研究院,河南省郑州市450052 [2]清华大学深圳研究生院,广东省深圳市518055 [3]华中科技大学电气与电子工程学院,湖北省武汉市430074 [4]武汉云兆信息技术有限公司,湖北省武汉市430069

出　　处：《电网技术》2018年第4期1335-1341,共7页Power System Technology

基　　金：国家电网公司科技项目(52170216000D)~~

摘　　要：为探究500 kV陕瀛线复合绝缘子异常发热的原因,采集故障绝缘子样本进行了红外和紫外检测、解剖分析、电镜扫描、X射线能谱分析等试验,结果表明,陕瀛线复合绝缘子异常发热故障是酥朽老化引起;酥朽老化是绝缘子的内部蚀损导致,其直接表现特征为局部发热,红外精确定位是早期发现此类故障的有效办法;酥朽老化的形成过程与复合绝缘子内部缺陷引起的局部放电有关,局放引起发热,伴随环氧树脂化学裂解,玻璃纤维表面蚀损,硝酸根离子产生等特征,导致绝缘子机械强度下降。In order to investigate reasons of unusual heating of composite insulators in an AC 500 kV line, this paper collects faulty insulators to perform a series of tests, including infrared and ultraviolet detection, dissecting detection, SEM detection, X-ray photoelectron spectroscopy analysis and FTIR spectrum analysis. Results show that the unusual heating of the composite insulators is caused by decay-like aging, and the decay-like aging is caused by internal defects of composite insulator, characterized with local heating. Infrared positioning detection is an effective method for early diagnosis for this kind of aging. Forming process of decay-like aging may be related to partial discharge caused by the internal defects of composite insulators. This kind of aging may belong to a form of thermal aging with main features of degradation and deterioration of epoxy resin matrix in FRP core, surface erosion of glass fiber and production of nitrate ion, resulting in degradation of mechanical strength of composite insulators.

关 键 词：复合绝缘子 酥朽老化 局部放电 红外检测 耐酸芯棒 

分 类 号：TM85[电气工程—高电压与绝缘技术]