Abstract
C6F12O (1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)pentan-3-one) is one of the most potential alternative insulation medium to SF6 due to its excellent electrical strength and environmental effect. Although several works on the insulation and decomposition properties of C6F12O have been carried out in recent years, the detailed decomposition pathways and mechanism of C6F12O haven’t been revealed up to now. A comprehensive analysis of the decomposition mechanism of C6F12O is performed through high-level quantum chemistry calculations with DFT and TST in this paper. The results show that more than ten decomposition products are formed. C4F10(a), C5F12(b), and CO can be used for evaluating slight failures. C3F8, C2F6, C2F4, C3F6, C4F10(b), C5F12(a), C6F14(a) and C6F14(b) etc. can be taken as typical products when a general failure is caused in the equipment. CF4 can be used as a basis for determining whether a serious failure has occurred in the gas-insulated electrical equipment. According to the analysis, primary decomposition products such as C4F10(a) and C5F12(b) have relatively high dielectric strength. Besides, the concentration of decomposition products of C6F12O is low to have a major impact on the overall electrical performance at normal conditions. However, the insulation properties of C6F12O gas mixtures after the prolonged operation or multiple arc extinctions deserve further investigation. In the view of human safety and environmental effect, several toxic products such as C2F4, CO, and C3F6 should be effectively managed and handled with care. This paper could provide a theoretical basis for related engineering applications.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51677061) and the science and technology project of China Southern Power Grid (No. GDKJXM20170043). We sincerely appreciate the National Supercomputing Center of Changsha for providing us with computational time.
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Wang, F., Liu, J., Zhong, L. et al. Theoretical Analysis of the Decomposition Pathways and Species of Environmentally Friendly Insulation Gas C6F12O Based on the DFT and TST. Plasma Chem Plasma Process 41, 133–153 (2021). https://doi.org/10.1007/s11090-020-10129-4
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DOI: https://doi.org/10.1007/s11090-020-10129-4