覆冰复合绝缘子电场分布的研究

Study on Electric Field Distribution of Icing Composite Insulators

为研究覆冰复合绝缘子的电气特性,基于ANSYS有限元法建立了330 k V覆冰复合绝缘子模型,分别模拟仿真了干、湿覆冰情况下,不同空气间隙位置及冰棱长度对覆冰复合绝缘子的沿面电场、电位分布的影响,并与清洁复合绝缘子进行比较分析。结果表明:与清洁复合绝缘子相比,覆冰明显畸变了复合绝缘子的沿面电场和电位分布;当覆冰未完全桥接大伞裙间时,随着冰棱长度的增长,对沿面电位和电场分布的畸变程度越严重。当融冰过程中形成水膜时,覆冰复合绝缘子的沿面电场和电位分布进一步畸变,此时更容易发生局部放电。

In order to study the electric property of icing composite insulators, we established a 330 kV icing composite insulator model base on the commercial finite element software ANSYS. The effects of different position of air gap and the length of icicle on the surface electric field and potential distribu-tion of the icing composite insulators were simulated under the condition of wet and dry icing, and com-pared with the clean composite insulators. The results show that the icing distorts the surface electric field and potential distribution obviously compared with the clean composite insulator. When the icicle do not fully bridge with big umbrella skirt, with the growth of icicle, the distortion on surface potential and electric field distribution is more serious. When the water film is formed in the process of melting ice, the surface electric field and potential distribution of the icing composite insulators would distort further, and partial discharge is more likely to occur at this time.