Abstract
The effect of dissolved electronegative gases (SF/sub 6/, C/sub 8/F/sub 16/O, C/sub 8/F/sub 18/ and C/sub 2/Cl/sub 3/F/sub 3/) on the dielectric strength of transformer mineral oil is investigated. The conduction current-stress characteristics are studied in this experimental work. The results show that the dissolved electronegative gases exhibit a reduction in the conduction current level. The perfluorocarbon dissolved gases show a relatively lower current level than that of SF/sub 6/ and SF/sub 6//N/sub 2/ mixture. The C/sub 8/F/sub 16/O/N/sub 2/ mixture exhibits a reduction in the conduction current level.