憎水性表面水带形状对其闪络特性的影响

The Influence of Hydrophobic Surface Bending Water Band on Its Flashover Characteristics

由于具有优异的防污闪性能,复合绝缘子已经被广泛应用于电力系统。复合绝缘子的憎水性和憎水迁移性是其优异防污闪特性的关键因素,当其表面憎水性减弱或丧失时,绝缘子受潮后表面会产生水珠、水带,此时的复合绝缘子的闪络电压有可能大幅下降。为此,研究了表面覆有水带的憎水性试片的闪络特性,观察了局部电弧在不同形状水带表面的动态发展过程,定义了干带击穿后水带的临界闪络长度,并通过仿真研究了沿水带路径的电场分布。研究结果表明,当覆有水带的试片表面产生局部电弧以后,试片表面电场分布沿水带路径发生明显畸变,导致电弧发展路径的变化以及水带临界闪络长度的改变,研究结果可以加深对憎水性表面闪络过程的认识。

Due to the excellent insulation properties,composite insulation materials are widely used in power grids.The hydrophobicity of composite insulation material is the key factor of its antifouling flashover characteristics.When the hydrophobicity of composite insulation material on the surface is weakened,water droplets on the surface of composite insulation material will be formed in the wet environment and even converge into a water band,which will affect the insulation performance of composite material.In this paper,the flashover characteristics of hydrophobic test plates coated with water strip are experimentally studied,the dynamic development process of local electric arc on the surface of different shapes of water strip is observed,the critical flashover length of water strip after the breakdown of dry strip is defined,and the electric field distribution along the path of water strip is studied by simulation.The results show that when a local arc is generated on the surface of the test strip coated with water,the electric field on the test strip is distorted along the path of the water strip,resulting in the change of arc development and the change of the critical flashover length of the water strip.The results can help to deepen the understanding of surface flashover process of hydrophobic materials.