污秽状态下不同盘径复合绝缘子周围电场分布的比较研究

摘要

In recent years, insulator flashover occurred repeatedly in the northwest power grid, and caused tripping accidents and a large economic losses, which is a major risk for the reliability of power supply. Contamination on the surface of insulators is one of main reasons causing flashover. In this pa-per, the electric field distribution of 330 kV line composite insulator which covered by contamination was studied used finite element method. It was analyzed that distribution of potential and electric field of com-posite insulator covered different contamination. The effects of conductivity of pollution layer on the distri-bution of potential and electric field of composite insulator was studied. It was compared that electric field distributions of composite insulators cover by uniform and non-uniform pollution layers.%近年来，西北电网多次发生绝缘子闪络跳闸事故，对电网供电可靠性造成了重大影响，经济损失很大。绝缘子表面聚集的污秽是引起闪络的主要原因之一。该文应用有限元法对西北电网两种不同盘径的330 kV线路悬式复合绝缘子进行了建模，并对污秽状态下的电场分布进行了仿真和比较。分析了不同污秽情况下此两种不同盘径复合绝缘子的电位、电场分布情况；研究了污层电导率对复合绝缘子电位、电场分布的影响；对比了污层均匀分布和不均匀分布对复合绝缘子表面电场分布的影响；研究了不同盘径绝缘子组合下绝缘子串的污秽承受能力。