中文摘要：

导线表面染污是影响直流输电线路电磁环境问题的重要因素。为此，使用有限元分析软件对导线表面存在污秽颗粒时的电场分布情况进行了仿真，重点研究了圆锥、圆柱、球、半球形4种突起的几何参数和相对介电常数对导线表面最大电场强度的影响。仿真结果表明：污秽突起的长度（半径）、顶角以及污染物的介电常数是影响染污导线表面电场强度的重要因素；污秽导线的电场强度较正常值增加5倍；污秽物突起的顶点处场强最高，可导致电晕；圆锥型污秽物电场畸变最严重；污秽导线场强与污秽物介电常数呈正相关。该研究可用于指导污秽地区输电线路的设计。

英文摘要：

The contamination adhering to the surface of conductors affects the electromagnetic environment of HVDC transmission line. The distribution of the electric field of conductor with contamination particulates adhering to its surface was simulated by using the software of finite element analysis. The influences of geometry parameters and relative dielectric constant of four particulates on the conductors＇ surface maximum electric field strength were emphatically researched. The results show that length （radius）, vertex angle and relative dielectric constant are important factors on the contamination conductors＇ surface maximum electric field strength.