Abstract
SF6 is widely used in all kinds of high-voltage electrical equipment because of its excellent insulation and arc-extinguishing performance. However, this compound leads to serious greenhouse effect, which harms the environment. Many research institutions are now actively in search of SF6 alternative gas. C5F10O has attracted much attention as an alternative gas with low global warming potential (GWP) and excellent dielectric strength. In this paper, we analyzed the possible decomposition paths of C5F10O under micro-water environment through density functional theory. We also evaluated the ionization parameters and toxicity of the decomposition products. The results show that OH• and H• produced by H2O exhibited a catalytic effect on the decomposition of C5F10O. CF4, C2F6, C3F6, C3F8, C4F10, C5F12, C6F14, C3F7COH, C3F7OH, CF3COH, C3F7H, and CF3OH were produced in the micro-water environment. Based on molecular configuration calculation, the ionization parameters of these products were inferior to perfluorocarbons, such as C3F8, leading to reduced insulation performance of the system. Moreover, CF2O and HF are hazardous to human health and equipment safety. Results will provide a basis for further study of the insulation characteristic of the C5F10O gas mixture under micro-water condition to guide the formulation of their relevant international standards prior to engineering applications.
Highlights
SF6 is widely used in high-voltage electrical equipment and electrical systems because of its excellent insulation and arc-extinguishing performance
The frontier molecular orbital theory points out that, for intermolecular reactions, when the reactants are close to each other, the occupied orbit of one molecule first interacts with the lowest unoccupied orbital of another molecule, and electrons move from HOMO to LUMO.[21,22]
C=O and its adjacent C atoms are seen as the largest electron density distribution sites with high reactivity, which may fracture under high-energy electric field or local overheating faults and undermine the insulation of the system
Summary
SF6 is widely used in high-voltage electrical equipment and electrical systems because of its excellent insulation and arc-extinguishing performance. SF6 is recognized as a greenhouse gas with global warming potential (GWP) that is 23,900 times than that of CO2 and an atmospheric lifespan of 3200 years.[1,2] SF6 gas accounts for more than 15% of the total greenhouse gas emissions.[3] the use of harmful greenhouse gases (SF6) must be restricted to achieve sustainable development of the power industry. C5F10O has received much research attention as alternative gas to SF6 for its safety, environment-friendly and excellent insulation strength. It exhibits lower GWP (only 1) and twice higher dielectric strength than SF6.4 the atmospheric pressure liquefaction temperature of C5F10O is high; as such, this gas must be mixed with N2, CO2, and other buffer gases
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