When a fault arc occurs in oil-filled electric power equipment such as transformers in transmission and distribution systems, it generates a flammable gas and a dynamic pressure rise that may trigger an explosion. The purpose of this fundamental study is to investigate the effects of the arc under electrical insulation oil on pressure rises in a closed vessel containing air and oil. In particular, this paper is intended to investigate the relationship between the pressure rises and the generated bubble behavior by the arc. The pressure rises in both air and oil are measured under experimental conditions involving an arc current ranging from 2.3 to 8.9kA, an arc duration of 10 or 100 milliseconds. Experimental results show that the behavior of a bubble affects the pressure rises in the air and the oil as low-frequency pressure oscillation comparatively.
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