1μsパルス電圧印加時の絶縁油中の沿面放電から得られた破壊遅れ

抄録

Breakdown time lag obtained from surface discharge propagation on a solid dielectric in insulating oil with point-to-plane electrode configuration was studied using a photo-optical current measuring system and a 1 micro-second rectangular high voltage pulse ganerator. The time lag was directly measured from prebreakdown current. The time lag for negative point is greatly decreased by the presence of solid dielectric surface, compared with that for positive point. The time lag for negative point is longer than that for positive one except at extremely higher electric field condition. At the higher field, the time lag is found to be almost the same for both point polarities. Very little effect of dielectric materials or their thickness on the time lag is observed for both point polarities. On the basis of these results, a new breakdown propagation model involving polarization effect and auger process is proposed.