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- W3048333477 abstract "Since sulfur hexafluoride (SF 6 ) has been subject to various regulations to reduce the emissions, the eco-friendly alternative gases or gas mixtures have attracted considerable attentions for the electric applications in high voltage transmissions and substations. The mixture of fluoronitrile, i.e., heptafluoro-iso-butyronitrile, (CF 3 ) 2 CFCN, with CO 2 is an effective technique as a candidate to replace SF 6 . However, such a fluoronitrile/CO 2 mixture is lack of the self-healing ability unlike SF 6 that it recombines quickly after being dissociated by an electric arc or fault. Therefore, it is important to monitor the decomposition products of the fluoronitrile/CO 2 mixture for the purpose of insulation failure alert. Mechanisms for the reactions of (CF 3 ) 2 CFCN with atomic oxygen due to dissociation of CO 2 were calculated using the high-level ab initio methods. It is revealed that the reaction of O(3P, 1D) with (CF 3 ) 2 CFCN proceeds predominantly via the successive C-O addition/elimination pathways and the singlet-triplet intersection to form C 3 F 7 and NCO radicals as the nascent products. Various ketones, i.e., CF 2 O, CF 3 C(O)CF 3 , FC(O)CN, etc., alkanes, i.e., CF 4 , C 2 F 6 , C 4 F 10 , C 6 F 14 , etc., and alkenes, i.e., C 3 F 6 , are produced via the secondary reactions. To mimic the decomposition details after arc breaking, the reactive molecular dynamics simulations were carried out by mean of an extensively optimized reactive force-filed for the C/H/N/O/F system. It was found that the arc decomposition of the fluoronitrile/CO 2 mixture produces the NO x (e.g., NO, NO 2 ) species. In the presence of water impurity, some acidic byproducts including HF, FNCO, FCOOH, etc., can be generated. Theoretical calculations provide an a priori method to detect arc failure of the fluoronitrile/CO 2 insulation using the characteristic gases and shed new lights on the operation and maintenance of the electric equipment for health and safety measures." @default.
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- W3048333477 date "2020-06-01" @default.
- W3048333477 modified "2023-10-14" @default.
- W3048333477 title "Theoretical Investigations on the Decomposition Characteristic Gases of Fluoronitriles/CO2 Mixture After Arc Interruption" @default.
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- W3048333477 doi "https://doi.org/10.1109/eic47619.2020.9158706" @default.
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