硅橡胶表面分离水珠放电特性的研究

Study of Discharge Characteristics of Discrete Water Drops on the Silicone Rubber Surface

通过试品模拟试验研究了硅橡胶表面存在单个和多个水珠时的放电特性 ,分析了洁净硅橡胶表面凝结水珠时的闪络过程。结果表明 ,硅橡胶表面的分离水珠使水珠、硅橡胶和空气的三者交接处的场强加强 ,产生强烈局放以及间歇式的小电弧 ,水珠周围局部丧失憎水性和电场力的作用使水珠拉长 ,场强进一步加强发生闪络。

According to lots of simulating tests on the model sample, this paper studies the discharge characteristics when the silicone rubber surface has one or more water drops and analyses the flashover process of the clean silicone rubber surface covered with condensing water in a controlled fog chamber. The results show that the electric field is intensified at the interface between the water drop because of discrete water drops on the silicone rubber surface, air and silicone rubber. It will produce intense partial discharges and intermittent partial arcs. Then water drop will be elongated by electrical field force because of part loss of hydrophobicity around it. Consequently the electric field will be intensified further and it cause flashover.