Estimates of dielectric recovery rates of supercritical (SC) and liquid carbon dioxide (CO 2 ) were derived with focus on highly-repetitive pulsed power switching mediums. Calculated results suggest that recovery time of SC and liquid CO 2 are approximately 50 times shorter than that of water and oils. Prior to 10 µs after breakdown, recovery rates in neither SC nor liquid CO 2 reached 100%, though the recovery rate in SC CO 2 was higher than that of liquid CO 2 . To examine causes of recovery rate differences, each dielectric recovery process in SC and liquid CO 2 was observed by laser shadowgraph technique. These shadowgraph images suggest two factors explaining dielectric recovery rate differences between these medium conditions: 1) thermodynamic property differences between medium conditions, and 2) differences in the low density region recovery mechanism.
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