复合绝缘子污闪动态发展过程与影响因素

针对电力系统中绝缘子污闪频繁发生的问题,分析了污闪形成的主要原因和整个污闪的动态过程,并探讨了相关宏观因素对闪络过程中各阶段温度场的影响.基于FZSW-10/4复合支柱绝缘子进行人工污秽试验,记录了局部电弧形成、桥接、发展为沿面闪络的过程,分析了不同盐密条件下绝缘子的起晕电压与闪络电压的变化规律,并根据试验条件建立了复合绝缘子污闪研究的动态电弧模型.仿真结果表明:污秽电导率、干区个数对局部电弧发展阶段有显著影响;气压对污闪的影响体现在完整电弧形成后.

Dynamic development process and influencing factors of pollution flashover for composite insulators

Aiming at the frequent occurrence of insulator pollution flashover in the power system, the main causes of pollution flashover and the dynamic process of whole pollution flashover were analyzed, and the influence of related macro-factors on the temperature field at each stage of flashover process was investigated. The artificial contamination experiment based on FZSW-10/4 composite post insulators was conducted, the process of local arc formation, bridge connection and development to surface flashover was recorded, and the variation rules of corona discharge voltage and flashover voltage of insulators under different salt density conditions were analyzed. The dynamic arc model for the pollution flashover study of composite insulators was established based on the experimental conditions. The simulation results show that the pollution conductivity and dry band number have significant influence on the development stage of local arc, and the influence of atmospheric pressure is reflected after the complete arc forming.