Abstract

Surface discharge transforms flashover through streamer to leader. Flashover causes damage to electric equipment and fire accident. Therefore, surface discharge velocity and distance have been researched by using Dust Figure and Lichtenberg Figure method for many years. Recently, surface discharge luminescence as time resolving pictures can be measured by optical equipment. In this study, a quartz glass plate having a back side electrode and luminescence permeability was used as a dielectric material. In this experiment, pictures of positive surface discharge luminescence on the quartz glass plate in atmospheric air were directly taken from its backside by ICCD camera. Additionally, surface discharge velocity on the quartz glass plate in atmospheric air was led from the distance of surface discharge development after 50 ns passed from the start of discharge. In this experiment, the steep positive impulse voltage was applied respectively 15–30 kV. As a result, positive surface discharge velocity was led from pictures of its luminescence and we confirmed that the more the applied voltage increased, the faster surface discharge velocity becomes.

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