Abstract
CF 3 I gas has low greenhouse effect and good insulation properties, so it can replace SF 6 gas that has high greenhouse effect. In this study, the partial discharge inception voltage (PDIV) of CF 3 I/CO 2 mixed gas is measured by power frequency test under different gas pressures, mixing ratios, and gap distances. The influence of these conditions on the partial discharge performance of CF 3 I/CO 2 mixed gas is investigated. The PDIV of the CF 3 I/CO 2 mixed gas is also comparatively analyzed with that of SF 6 /CO 2 mixed gas. The results show that the PDIV of the CF 3 I/CO 2 mixed gas is 1-1.2 times higher than that of SF 6 /CO 2 mixed gas,when the mixture ratio is between 10-30% and the gas pressure is between 0.1-0.3 MPa, which means the insulating ability of the CF 3 I/CO 2 mixed gas is better than that of the SF 6 /CO 2 mixed gas. By contrast, the PDIV of these two mixed gases exhibit similar variation trend with gas pressure when the mixing ratio is more than 20%. There is positive synergistic effect on the PDIV of CF 3 I and CO 2 . These results indicate that CF 3 I/CO 2 (20 to 30%) mixed gas may be used to replace SF 6 gas for gas-insulated equipment applications.
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