应用显微红外法的硅橡胶复合绝缘子伞裙老化深度研究  

An Infrared Microspectroscopy Method for Determining Degradation Depth of Silicone Rubber Composite Insulator Shed

作　　者：彭向阳[1] 林宏升[2] 黄振[1] 周宇明[2] 张妮[2] 方鹏飞[2] 

机构地区：[1]广东电网公司电力科学研究院,广东省广州市510080 [2]武汉大学物理科学与技术学院,湖北省武汉市430072

出　　处：《电网技术》2017年第4期1350-1356,共7页Power System Technology

基　　金：国家自然科学基金项目(21174108);中国南方电网公司科技项目(K-GD2014-185)~~

摘　　要：复合绝缘子在运行环境因素的综合作用下易发生老化并引发绝缘子性能劣化乃至失效,因此对绝缘子老化影响深度进行检测和评估非常必要。采用显微红外光谱技术,通过测量硅橡胶伞裙由表及里不同深度处的2960 cm-1甲基峰面积分布变化,发展了一种测量运行硅橡胶复合绝缘子老化深度的检测技术。系统讨论了显微红外光谱法的测试原理、扫描方式、边界效应影响等问题,并分别针对线扫描及面扫描模式提出了相应的老化深度计算方法。同时应用该方法测试了广东电网500kV输电线路抽检复合绝缘子低压端伞裙的老化深度,发现基本在50~85?m之间;还对500kV榕茅甲线断串复合绝缘子的故障部位伞裙的老化状态进行了研究,发现由于高压端放电现象严重,故障部位伞裙老化深度达105~141?m,为正常老化情况(35?m)的3~4倍。Degradation of silicone rubber is due to combined effects of environmental factors such as UV radiation, intense electric field, humidity and so on. Thus, it is necessary to determinate degradation depth and evaluate aging state of composite insulators in service. In this paper, infrared microspectroscopy technique was employed to study aging state of silicone rubber, and a novel method was developed to investigate degradation depth according to variation of peak areas in infrared vibrational spectrum of C-H stretch modes arising from methyl group vibration（2960 cm-1）. Testing principle, scan mode and boundary effects of infrared microspectroscopy were discussed. Based on line and surface scanning modes, corresponding calculation methods of degradation depth were proposed respectively. The technique was applied to operation state evaluation and aging failure analysis for composite insulators in service. For example, degradation depths of silicone rubber sheds at low-potential end of selected composite insulators of some 500kV transmission lines in Guangdong Power Grid were obtained as about 50-85μm. Aging state was checked and investigated for silicone rubber sheds at broken composite insulators around fault locations in Rongmao Line A. Results showed that degradation depths of these sheds were 105-141μm because of serious discharge, 3 to 4 times as deep as for normal situation.

关 键 词：复合绝缘子 硅橡胶伞裙 显微红外法 老化行为 老化深度 运行维护 

分 类 号：TM86[电气工程—高电压与绝缘技术]