Experimental study on the effect of O2 on the decomposition characteristics of C6F12O/CO2 gas mixture

摘要

C 6 F 12 O has the potential to be used in gas-insulated equipment because of its excellent insulation performance and low global warming potential value. In order to study the effect of O 2 on the decomposition characteristics of the C 6 F 12 O/CO 2 gas mixture, power frequency breakdown experiments were conducted on a C 6 F 12 O/O 2 /CO 2 gas mixture with different O 2 mixing ratios. The decomposition products of the C 6 F 12 O gas mixture after multiple breakdowns were analyzed qualitatively and quantitatively by gas chromatography-mass spectrometry. The effects of the O 2 mixing ratio, breakdown times, and effective gas production rate on the decomposition characteristics of the gas mixture were investigated. The results show that the main decomposition products are CF 4 , C 2 F 6 , C 3 F 6 , C 3 F 8 , C 4 F 10 , C 5 F 12 , C 3 F 7 H, and CF 2 O, and the addition of O 2 will promote the formation of the above several decomposition products. Except for C 3 F 6 , the concentrations of other decomposition products tend to increase and then decrease with the increase in the O 2 mixing ratio. The concentrations of CF 4 , C 2 F 6 , C 3 F 6 , and C 3 F 8 increase with the times of breakdowns. The effective gas production rates of CF 4 , C 2 F 6 , and C 3 F 8 show a trend of increasing and then decreasing in the process of adding O 2 to the C 6 F 12 O/O 2 /CO 2 gas mixture. This study provides a reference for the industrial application of the C 6 F 12 O/O 2 /CO 2 gas mixture.