复合绝缘子护套-芯棒界面异常老化特征及原因分析  

Abnormal Aged Characteristics and Causes of Sheath-core Interface in Composite Insulators

作　　者：汪政 黄振[1] 彭向阳 卢煜 杨粤 何春清 方鹏飞[2] WANG Zheng;HUANG Zhen;PENG Xiangyang;LU Yu;YANG Yue;HE Chunqing;FANG Pengfei(Guangdong Key Laboratory of Electric Power Equipment Reliability,Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;College of Physics and Technology,Wuhan University,Wuhan 430072,China;Chaozhou Power Supply Company of Guangdong Power Grid Co.,Ltd.,Chaozhou 521031,China)

机构地区：[1]广东省电力装备可靠性企业重点实验室(广东电网有限责任公司电力科学研究院),广东广州510080 [2]武汉大学物理科学与技术学院,湖北武汉430072 [3]广东电网有限责任公司潮州供电局,广东潮州521031

出　　处：《绝缘材料》2022年第3期112-118,共7页Insulating Materials

基　　金：中国博士后科学基金项目(2020M682609);南方电网公司科技项目(GDKJXM202000403)。

摘　　要：护套-芯棒界面是复合绝缘子内绝缘的重要组成部分,与复合绝缘子的异常运行缺陷、故障密切相关。本文针对一起发热的500 kV运行复合绝缘子进行深入分析,结合多种表征技术对护套-芯棒界面老化特征进行了研究。结果表明:界面处护套的老化受其所在位置电场强度的影响显著。有异常温升或放电处的硅橡胶护套和环氧玻纤芯棒粘接良好,但界面处都有颗粒物缺陷存在。硅橡胶护套的Si-O键峰强由里向外逐渐增强,在1650 cm;处的-NO;键峰强也表现出相同的趋势,表明硅橡胶护套的老化是由里向外逐渐发展的,与正常老化顺序相反。界面处芯棒表面老化发白,其环氧树脂的相对含量由17.7%降低至11.4%。对界面颗粒物进行X射线衍射分析,发现其主要成分为氢氧化铝,推断是由小颗粒的氢氧化铝填料团聚形成的。这类界面颗粒物缺陷是在复合绝缘子制造过程中产生的,具有隐蔽性。Sheath-core interface is an important part of the internal insulation for composite insulators,and it is closely related to the abnormal running defects and failures of composite insulator.In this paper,an aged 500 kV composite insulator with abnormal heating was systematically investigated.The ageing characteristics of materials in sheath-core interface were studied by a variety of characterization techniques.The results show that the ageing of the sheath at the sheath-core interface is significantly affected by the electric field strength of its location.The silicone rubber sheath with abnormal temperature rise or discharge adheres well to the epoxy glass fiber core,but there are particle defects at the sheath-core interface.The peak strength of Si-O bond of silicone rubber sheath increases gradually from the inside to the outside,and the peak strength of-NO;produced at 1650 cm;also shows the same trend.These results indicate that the ageing of silicone rubber sheath develops gradually from the inside to the outside,which is contrary to the normal ageing order.The core surface at the interface is already aged and turns to white,and the relative content of epoxy resin in the core material decreases from 17.7%to 11.4%.The Xray diffraction analysis of the interface particles shows that its main component is aluminum hydroxide(ATH),and it is deduced that the interface particles could be formed due to the aggregation of ATH.This kind of interface particle defect is generated in the manufacturing process of composite insulator,and it is hard to find from appearance.

关 键 词：护套-芯棒界面 复合绝缘子 异常老化 界面缺陷 氢氧化铝团聚 

分 类 号：TM216[一般工业技术—材料科学与工程]