局部表面电导率法测量绝缘子憎水性表面的污秽分布  

Measurement of Contamination Distribution on the Hydrophobic Surface of Insulators by a Partial Surface Conductivity Method

作　　者：关志成[1] 郭晨鋆[1] 王耿耿[1] 梅红伟[1] 王黎明[1] 项阳 

机构地区：[1]清华大学深圳研究生院,深圳518055 [2]南方电网科学研究院,广州510000

出　　处：《高电压技术》2014年第4期957-964,共8页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724503);南网重大科技项目~~

摘　　要：局部表面电导率可以用来有效地表征绝缘子污秽度,但是,对于憎水性表面局部电导率的测量存在困难。为此,通过滴高岭土悬浊液将憎水性局部表面改变为亲水性表面并测量局部区域电导率的新方法,实现了憎水性表面局部电导率的测量。通过对现场绝缘子憎水性表面局部的电导率测量,将新方法与等值盐密法进行了对比以验证新方法的有效性,同时分析了2种测量方法的测量结果存在差异的原因。研究发现:电场作用、绝缘子表面材料、环境气候等因素均会对绝缘子表面的污秽分布造成影响:直流换流站中正极性设备的积污普遍重于负极性设备;同样的外界条件下,RTV表面积污重于复合硅橡胶表面;降雨较少的地区迎风面积污重于背风面,降雨较多的气候下背风面积污重于迎风面。相关研究方法及结论,可用以对绝缘子憎水性表面的积污规律进行长期的研究分析。Partial conductivity can reflect the degree of pollution on insulators effectively. However, it is difficult to measure on hydrophobic surfaces. Hence, we introduced a new method that changes a part of hydrophobic surface into hydrophilic by dipping kaolin suspension liquid to realize measurement of partial conductivity on hydrophobic surfaces. With the proposed method, measurements were carried out on hydrophobic surfaces for site insulators. Comparison with ESDD measurements proves the validity of the proposed method, and reasons for the difference between results of the two methods were analyzed as well. Further analysis on the results show that electric field, surface material of insulators and climate all influence pollution distribution： in HVDC converter stations, positive DC insulators are contaminated more heavily than negative DC insulators; in the same environment, the contamination on RTV surface is more serious than that on silicone rubber; windward side has more contamination than leeward side in the region with low rainfall, yet leeward side has more contamination in rainy climate. Methods and results of this paper are useful for long-term rule re- searches of pollution accumulation on insulators.

关 键 词：绝缘子 憎水性 高岭土悬浊液 污秽分布测量 局部表面电导率 等值盐密法 

分 类 号：TM216[一般工业技术—材料科学与工程]