Abstract
In this paper, we quantitatively investigated impulse conditioning mechanism under nonuniform electric field electrodes in a vacuum. A negative standard lightning impulse voltage was applied between rod and plane electrodes whose materials were Cu-Cr, stainless steel and Cu and gap lengths were d=5 and 10 mm, respectively. Experimental results revealed transition of breakdown (BD) sport region on rod electrode and corresponding BD field strength in conditioning process. As a result, we found that BD spot region started at tip of rod electrode and moved to wider region of rod electrode with lower electric field as shots of voltage application increased before saturation of BD voltage. Finally, by analyzing results with an electric field strength, we propose that the conditioning degree along electrode surface distributed directly proportional to electric field distribution under a nonuniform electric field in a vacuum, irrespective of electrode materials
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