摘要
绝缘子表面污秽颗粒粒径分布的不同会导致污层吸水特性的差异,进而影响污层的电导率和绝缘子的闪络特性。为了研究雾霾环境下自然积污绝缘子的污秽颗粒粒径分布特性,在交流、直流作用电压下和不带电情况下对4类绝缘子进行雾霾环境下的自然积污,利用电子显微镜和图像二值化处理软件对绝缘子污秽颗粒的粒径大小进行统计。统计结果表明,雾霾环境下自然积污绝缘子污秽颗粒的粒径服从对数正态分布,90%的污秽颗粒粒径<20μm;交流、直流、不带电3种情况下的污秽粒径分布存在差异,表现为直流电压下的平均粒径最小,交流电压下的平均粒径最大;上伞面的平均粒径大于下伞面;复合绝缘子污秽颗粒的平均粒径较瓷和玻璃绝缘子大。进一步分析发现,不同带电形式下,上下伞面以及不同类型绝缘子污秽颗粒粒径分布的差异,分别是由污秽颗粒所受的电场力和重力及绝缘子材质不同引起。
Difference of contamination particle size distribution on insulator surface can result in difference in water absorption ability of pollution layer, and then affect conductivity of pollution layer and flashover characteristic of insulator. To study particle size distribution characteristics of contamination of naturally polluted insulators under fog-haze environment, SEM（scanning electron microscope） and image binary software were utilized for statistics of contamination particle size of four kinds of insulators under AC, DC voltage stress, and uncharged condition. The experimental results indicate that contamination particle size distribution of insulators under fog-haze environment obeys lognormal distribution, and 90% of contamination particles are less than 20μm; Contamination particle size distributions in AC, DC, and uncharged states are different, in which the average contamination particle under DC voltage is the smallest, and the average contamination particle under AC voltage is the most coarse; Average contamination particle of the upper surfaces is coarser than that of lower surfaces; Contamination particle of porcelain insulators and glass insulators are smaller than that of composite insulators. Further analysis shows differences in contamination particle size distribution of difference surfaces, insulator types under difference electrical field, and these diversities are caused by electric field force, gravity on pollution particles, and insulator material.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第11期3318-3326,共9页
High Voltage Engineering
基金
国家自然科学基金(51477072)~~
关键词
雾霾
自然积污
绝缘子
污秽
粒径
电子显微镜
fog-haze
natural pollution
insulators
contamination
particle size
SEM
