Study on pollution characteristics and pollution ratio of insulators of different materials
Insulator pollution flashover threatens the stable operation of power system.The accumulation of pollution on the insulator sur-face area is the premise of pollution flashover.The pollution accumulation process is affected by complex factors such as insulator mate-rial and weather conditions.Therefore,this paper studied the pollution characteristics and pollution ratio of insulators of different materi-als in Jiangsu area.Firstly,12 natural pollution accumulation tests were conducted on transmission lines in Jiangsu Province,including XP-160,XWP-160,FXBW-110,XP-160 coated with RTV,and XWP-160 coated with RTV.Based on the test results,the pollution char-acteristics of insulators of different materials were analyzed.It is found that in the first nine pollution accumulation periods,the salt den-sity of insulators is XP-160,XWP-160,FXBW-110,XP-160 of sprayed RTV and XWP-160 of sprayed RTV from large to small.In the last three pollution accumulation periods,the salt density of composite insulators increases greatly,so the salt density of FXBW-110 is higher than that of XWP-160,but still lower than that of XP-160.At the initial stage of pollution accumulation,the increment of insula-tors with hydrophilic surface is significantly greater than that of insulators with hydrophobic surface.However,with the increase of sur-face pollution,the anti pollution performance of hydrophobic materials decreases.Spraying RTV can greatly improve the anti pollution performance of insulators,but the lifting effect will decrease to a certain extent with the increase of time.In addition,the insulation of surface hydrophilic materials is more affected by rainfall erosion.The ash salt ratio of the five insulators is different,and the fluctuation range of the ash salt ratio of hydrophilic insulators is large.According to the pollution accumulation results in the biennium,the specific values of kRTV/XP-160,kRTV/XWP-160,kFXBW/XP-160and kFXBW/XWP-160 are 0.596,0.554,0.925 and 1.125 respectively.
万方数据
维普
