The flashover characteristics and process in air gap with floating metallic objects are investigated experimentally in the presence of unipolar ion flow field. In the present work, needle-to-plane electrodes of 120mm in gap length were used as the main gap electrodes and the shape of tested metallic objects was spheres with the radius of2, 10 and 15mm or needles of 5 to 40mm in length.
The experimental results show that the first corona is originated from the needle electrodes and the corona inception voltage is almost independent of the location of the floating objects, the gap between the floating metal and the plane electrode is locally bridged by spark when the floating metal is in the vicinity of the plane electrode, and the characteristics of flashover voltage versus the location of the floating metal are different completely with the shape of the floating metal and polarity of the applied voltage.
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