硅橡胶表面的分离水珠放电与不明原因闪络

通过对试品模型的试验研究，分析了硅橡胶表面存在单个和多个水珠时影响其放电电压的因素，并用高速摄像机观察了清洁硅橡胶表面雾中凝结水珠时的闪络过程．研究结果表明，由于硅橡胶表面的憎水性而使水珠只能以分离的形式存在，从而造成在水珠、硅橡胶和空气的三者交接处的局部场强集中，产生强烈局部放电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，场强进一步得到加强从而发生不明原因闪络。

Discharges Between Discrete Water Drops on the Silicone Rubber Sruface and Reason Unkown Flashover

According to the tests and researches on model sample, this paper analyzes the effects of flashover voltage when the silicone rubber surface has one or more water drops and observes the flashover process of the clean silicone rubber surface covered with condensing water in a controlled fog chamber with a high-speed video camera. The results show that water can only exist as discrete drops on the silicone rubber surface because of its hydrophobicity, and the field is intensified at the interface between the water drop, 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 the drop. Consequently the field will be intensified further and it cause the reason unknown flashover.