500 kV复合绝缘子横向覆冰现象有限元分析

雨凇覆冰严重影响输电线路的安全,绝缘子上的冰棱会导致其电场与电位分布的恶化。为探究绝缘子覆冰横向增长现象对绝缘子沿面电场电位的影响,利用ANSYS仿真软件,建立500 kV复合绝缘子覆冰有限元模型。根据输电线路现场与实验室中绝缘子覆冰出现的冰棱横向增长现象,在仿真模型中改变冰棱长度、角度、位置以及横向竖直冰棱同时出现等情况,对比分析不同工况下各覆冰形态对复合绝缘子电场电位分布的影响。仿真分析表明：雨凇条件下,覆冰横向增长冰棱长度、位置的改变对复合绝缘子沿面电位电场分布的影响较小;随着冰棱铅垂角度减小,复合绝缘子沿面电场电位分布畸变增大,竖直覆冰对复合绝缘子沿面电场电位分布起主要影响。

FEM Analysis on the Lateral Icing of the 500 kV Composite Insulators

Glaze icing has serious impacts on the safety of the transmission lines, and the icicles produced by glaze distorts the potential and electric field on the insulators. In order to study the impacts of the lateral icing on the potential and electric field distribution along composite insulators, the ANSYS software is used to establish a finite element model for the icing of the 500 kV composite insulators. According to the phenomenon that the icicles grow laterally on the insulator both in the field and laboratory, the impacts of various icing patterns on the potential and electric field distributions is analyzed with the simulation model under different conditions, including changing the length, angles and locations of the lateral icicles, and the lateral and vertical icing appearing in the same time. The simulation results show that under the glaze condition, the change of the length and locations of the lateral icicles has little impact on the potential and electric field distribution along the icing composite insulator.With the decrease of the vertical angle of lateral icicles, the potential and electric field distributions on the surface of composite insulators distorts increasingly. It is concluded that the vertical icicles have a major impacts on the potential and electric field distribution along the composite insulator.