长期运行复合绝缘子憎水性的非均匀变化特性  

Uneven Change Characteristic of Composite Insulators Hydrophobicity in Long-time Service

作　　者：屠幼萍[1] 陈静静[1] 许卓[1] 张福增[2] 李锐海[2] 张辉[1] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]中国南方电网有限责任公司,广州510623

出　　处：《高电压技术》2013年第6期1469-1475,共7页High Voltage Engineering

基　　金：国家自然科学基金(50877025)~~

摘　　要：研究绝缘子不同部位的憎水性状态及其影响因素对整支复合绝缘子的憎水性测试及判别具有指导意义。为此,以4串现场运行后的复合绝缘子为研究对象,采用静态接触角方法对整串绝缘子系统地进行憎水性测试。由测试结果可知,整支复合绝缘子的憎水性分布是不均匀的,主要表现为沿串不同伞裙、同一伞裙不同区域的憎水性不同。绝缘子沿串憎水性分布与沿串电场强度分布规律一致;对于同一伞裙,其上、下表面的憎水性存在差异,且其不同方位的表面也有差异,并存在憎水性相对最差的一个方位。进一步分析发现,绝缘子表面放电是造成运行复合绝缘子憎水性下降的主要因素,而长期紫外辐射及污秽作用会引起表面憎水性能的劣化。Studying the state of hydrophobicity and its influential factors of different areas of a composite insulator is of guiding significance for hydrophobicity tests and discrimination of the whole insulator. Thus, we selected four series of silicone rubber composite insulators in service to perform hydrophobicity tests on these whole strings of insulators by means of the static contact angle method. The test results showed that hydrophobicity o{ whole composite insulators was uneven, which could be seen in terms of different sheds along one string and different areas on the same shed. The distribution of hydrophobicity along one string agreed with that of electric field strength. Meanwhile, the upper and lower surfaces of one shed had quite different hydrophobicity. The difference in hydrophobicity was also found in different oriental areas of one shed, and the worst hydrophobicity characteristics of the shed surfaces of one string existed in one certain radial direction. Further analyses indicate that insulator surface discharge is the main reason leading to the uneven hydrophobicity of the sheds; long-time ultraviolet radiation and contamination accumulation are also figured to be account for the hydrophobicity degradation of composite insulators sheds.

关 键 词：复合绝缘子 憎水性 非均匀变化 电场强度 积污 静态接触角 

分 类 号：TM216[一般工业技术—材料科学与工程]