CAJ | 학술논문

复合绝缘子的积污特性与瓷绝缘子和玻璃绝缘子有所不同，研究其积污规律对防止污闪有着重要意义。为此，以3支实际运行后的±500kV直流复合绝缘子为研究对象，系统测量其沿串不同位置的污秽度，用等值盐密（ESDD）和灰密（NSDD）表征。试验发现绝缘子不同伞上下表面的等值盐密和灰密大多呈现出U形的分布规律，尤其以等值盐密的U形分布更为明显，而且不同伞上下表面污秽U形分布规律性的强弱有一定差异。讨论了积污过程中电场对污秽沉积的作用以及自清洗过程中雨水冲洗的随机作用，更好地解释了直流复合绝缘子的沿串积污规律。
복합절연자적적오특성여자절연자화파리절연자유소불동，연구기적오규률대방지오섬유착중요의의。위차，이3지실제운행후적±500kV직류복합절연자위연구대상，계통측량기연천불동위치적오예도，용등치염밀（ESDD）화회밀（NSDD）표정。시험발현절연자불동산상하표면적등치염밀화회밀대다정현출U형적분포규률，우기이등치염밀적U형분포경위명현，이차불동산상하표면오예U형분포규률성적강약유일정차이。토론료적오과정중전장대오예침적적작용이급자청세과정중우수충세적수궤작용，경호지해석료직류복합절연자적연천적오규률。
The contamination characteristics of composite insulators are different with porcelain and glass insulators and research about its contamination characteristics is of great significance to prevent pollution flashover. Thus, three ±500kV DC composite insulators in service were selected for test. The contamination density of different places along the insulators was measured and characterized by ESDD and NSDD. Experimental results indicate that the ESDD and NSDD of upper and lower surfaces of different sheds along the insulators commonly distribute as U-shape, especially for ESDD, and the regularities of different places on the insulators are different. With the discussion about the influence of electric fields in the contamination process and the influence of rainfall in the cleaning process, the regularity of contamination along DC composite insulators is better explained.