Abstract
C6F12O 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 O2 on the decomposition characteristics of the C6F12O/CO2 gas mixture, power frequency breakdown experiments were conducted on a C6F12O/O2/CO2 gas mixture with different O2 mixing ratios. The decomposition products of the C6F12O gas mixture after multiple breakdowns were analyzed qualitatively and quantitatively by gas chromatography-mass spectrometry. The effects of the O2 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 CF4, C2F6, C3F6, C3F8, C4F10, C5F12, C3F7H, and CF2O, and the addition of O2 will promote the formation of the above several decomposition products. Except for C3F6, the concentrations of other decomposition products tend to increase and then decrease with the increase in the O2 mixing ratio. The concentrations of CF4, C2F6, C3F6, and C3F8 increase with the times of breakdowns. The effective gas production rates of CF4, C2F6, and C3F8 show a trend of increasing and then decreasing in the process of adding O2 to the C6F12O/O2/CO2 gas mixture. This study provides a reference for the industrial application of the C6F12O/O2/CO2 gas mixture.
Highlights
Reducing greenhouse gas emissions is the consensus of all countries in the world today
The Global Warming Potential (GWP) value of SF6 is 23 500 times that of CO2 and its atmospheric lifetime is 3200 years, which has a lasting impact on the greenhouse effect
The results show that the addition of 4%–6% O2 to the C4F7N/N2 gas mixture can improve the insulation performance of the mixed gas and suppress the formation of partial decomposition products;16 the C4F7N/O2/CO2 gas mixture has good decomposition characteristics with an O2 mixing ratio of 2%–6%
Summary
Reducing greenhouse gas emissions is the consensus of all countries in the world today. The electrical performance and decomposition characteristics of C6F12O and its gas mixtures have been studied by several researchers. Wang et al discussed the decomposition mechanism of C6F12O based on density functional theory and transition state theory, and the typical decomposition products of gas-insulated equipment at different fault degrees were given according to the calculation results.. The addition of a new gas to the binary mixture of insulating gases may have a positive effect on electrical performance. Chen et al experimentally studied the insulation performance and decomposition characteristics of the C4F7N gas mixture with the addition of O2. The effects of the O2 mixing ratio, breakdown times, and effective gas production rate of decomposition products on the decomposition characteristics of the C6F12O/O2/CO2 mixture were studied. These research results may provide some reference value for the engineering application of the C6F12O gas mixture
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