电网技术Issue(5)：1373-1378,6.DOI:10.13335/j.1000-3673.pst.2014.05.038
沿海地区与内陆地区复合支柱绝缘子直流污闪特性比较
Comparison of DC Flashover Performances of Polluted Composite Post Insulators in Coastal Areas and Inland Areas
摘要
Abstract
According to the survey results of natural pollution of insulators in coastal areas, different ratios of equivalent salt deposit density (ESDD) to non-soluble deposit density (NSDD) are used to represent the accumulated pollution characteristics of composite post insulators located in coastal areas and inland areas. Firstly, the changing tendency of the upside shed surface resistances of the two sorts of specimens were measured in the fog chamber; then the DC artificial pollution tests were performed in National Engineering Laboratory for Ultra High Voltage Engineering Technology (Kunming) and the pollution flashover voltage U50%was determined by the Up-and-Down method. During the tests the partial discharge of the two sorts of specimens was observed by ultra violet camera and the statistics of ultraviolet photons was carried out, meanwhile the high-speed camera Phantom 12.1 was used to observe the partial discharge and the development of partial arcs on the insulator surfaces of the two sorts of specimens, which were assumed to be located in coastal areas or inland areas. Test results show that the surface resistances of specimens in inland areas with higher NSDD is lower than that in coastal areas;under the same ESDD the U50%of composite post insulators in coastal areas is higher than that in inland areas, and with the increase of ESDD the difference of the U50% between them is greater; on the specimens with higher NSDD for inland areas the partial arc is easy to occur and it causes the dry-bands on the surfaces of insulators, when dry-band appears, its strong water absorbability makes the dry-band moist once again immediately, and the repeated reoccurrence of this phenomena makes the insulator surface flashover and the U50% is lower than that of composite post insulators in coastal areas; with the increase of test ESDD, not only the surface resistances of the specimens decrease further, but also the arcing-bridge of sheds on inland area specimens with higher NSDD becomes more obvious, it decreases the availability of creepage distance evidently and make the greater difference between the U50% of composite post insulators in the inland areas and that in the coastal areas.关键词
沿海地区/复合支柱绝缘子/等值盐密/等值灰密/直流污闪特性Key words
coastal areas/composite post insulators/ESDD/NSDD/DC pollution flashover performance分类
信息技术与安全科学引用本文复制引用
谷裕,郝艳捧,张福增,薛艺为,闵剑峰,阳林,李立浧..沿海地区与内陆地区复合支柱绝缘子直流污闪特性比较[J].电网技术,2014,(5):1373-1378,6.基金项目
国家自然科学基金面上项目(51177052)。The Projects of National Natural Science Foundation Program (51177052) （51177052）
