220kV瓷绝缘子(XP-160)串的空间电场分布特性及其影响因素仿真分析

绝缘子串的电压和电场分布研究对瓷绝缘子的相关设计和运行维护非常重要。笔者根据瓷绝缘子串的实际结构和工作条件,选择有限元数值计算方法建立三维电场仿真模型进行计算分析和总结。仿真结果表明:瓷绝缘子串绝缘子伞下棱对其表面电场影响较大但对绝缘子串空间电场影响较小;避雷线对瓷绝缘子串的表面及空间电场影响甚微;不同塔型、不同相导线及其分裂数、绝缘子串型式及绝缘子型式、绝缘子的表面状态对瓷绝缘子串的周围电场值有一定的影响,在仿真分析时需予于考虑。文中仿真结果可为输电线路的设计及绝缘子在线监测提供一定的借鉴。

Simulation of Space Electric Field Distribution Around 220 kV Porcelain Insulator String (XP-160) and the Influencing Factors

Understanding voltage and electric field distribution of an insulator string is important for its insulator design and operation.In this paper,a three-dimensional electric field model is established with the finite element method to calculate and analyze the electric field of the porcelain insulator string according to its real structure and working conditions.The results show that the umbrella arris of insulator and lightning conductor exert a little impact on the space electric field,while the umbrella arris has clear influence on the surface electric field.Tower type,wire type and split,insulator string type,and insulation state of insulator surface all impose certain effects on the space electric field.They hence need to be considered in simulation analysis of the space electric field distribution of the insulator strings.