融冰期110kV覆冰复合绝缘子电场仿真研究

Simulation of Electric Field for 110 kV Iced Composite Insulator in Melting Period

绝缘子的融冰闪络一直是影响电力系统安全运行的一个重要问题,目前国内外对于绝缘子的融冰闪络机理方面的研究还处在一个不断发展的阶段。笔者运用ANSYS12.0有限元仿真软件,建立110 kV覆冰复合绝缘子二维轴对称模型,对绝缘子融冰水膜电导率、水膜厚度以及水膜存在水滴3个因素对电场分布的影响进行仿真分析。结果表明:水膜电导率对于电场分布的影响会随着覆冰长度的增加而增大;水膜厚度的增加会进一步缩短空气间隙,导致冰棱尖端场强增大;水膜末端存在水滴对绝缘子沿面电场分布畸变的影响更大。

Ice-melting flashover of insulators harms safe operation of a power system. In this paper, the finite element simulation software ANSYS12.0 is used to build a two-dimensional axis-symmetric model of 110 kV iced composite insulators for simulating and analyzing the effects of the conductivity of the water film on insulator, the thickness of the water film, and the water film with water droplets during ice-melting period on the electric field distribution. The results show that： 1）The effect of the water film conductivity on the electric field distribution enhances with the length of the ice increasing; 2）The increase in the water film thickness reduces the air gap, resulting in an enhancement of field intensity on the ice tip; and 3）the water droplets at the edge of the water film significantly affect the surface field distribution.