Formation mechanism of CF<sub>3</sub>I discharge components and effect of oxygen on decomposition

Xiao, Song; Li, Yalong; Zhang, Xiaoxing; Tang, Ju; Deng, Zaitao

doi:10.1088/1361-6463/aa5e89

Cited by 28 publications

(22 citation statements)

References 19 publications

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“…As a result, the CF 3 I content and insulation performance decreased with the extension of discharge time [31]. In order to ensure the insulation strength and safety, the O 2 content in CF 3 I cannot exceed 7% and 20%, respectively [32]. Therefore, it is impracticable to use O 2 and air as buffer gases with CF 3 I in GIS.…”

Section: Trifluoroiodomethane (Cf 3 I)mentioning

confidence: 99%

Alternative Environmentally Friendly Insulating Gases for SF6

Wang¹,

Huang²,

Liu³

et al. 2019

Processes

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Sulfur hexafluoride (SF6) shows excellent insulation performance as an insulating gas. It is suitable for various climate conditions due to its low boiling point (−64 °C). Therefore, it has been widely used in power grid equipment. However, its global warming potential (GWP) is 23,500 times higher than that of CO2. Thus, it is imperative to find an environmentally friendly insulating gas with excellent insulation performance, lower GWP, and which is harmless to equipment and workers to replace SF6. In this review, four possible alternatives, including perfluorocarbons, trifluoroiodomethane, perfluorinated ketones, and fluoronitrile are reviewed in terms of basic physicochemical properties, insulation properties, decomposition properties, and compatibility with metals. The influences of trace H2O or O2 on their insulation performances are also discussed. The insulation strengths of these insulating gases were comparable to or higher than that of SF6. The GWPs of these insulating gases were lower than that of SF6. Due to their relatively high boiling point, they should be used as a mixture with buffering gases with low boiling points. Based on these four characteristics, perfluorinated ketones (C5F10O and C6F12O) and fluoronitrile (C4F7N) could partially substitute SF6 in some electrical equipment. Finally, some future needs and perspectives of environmentally friendly insulating gases are addressed for further studies.

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Section: Trifluoroiodomethane (Cf 3 I)mentioning

confidence: 99%

Alternative Environmentally Friendly Insulating Gases for SF6

Wang¹,

Huang²,

Liu³

et al. 2019

Processes

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“…In order to explore the discharge decomposition path of c-C 4 F 8 and the effect of O 2 on its decomposition, a thermodynamic and kinetic combination method was used to analyze the orientation and mechanism of the reaction based on density functional theory (DFT). With regard to theoretical knowledge of calculations, it has been described in detail in our previous work [30,31]. The Dmol3 package was used to process exchange-related interactions using a local density approximation (LDA-PWC) approach to optimize the structure of c-C 4 F 8 and O 2 [25].…”

Section: Discussionmentioning

confidence: 99%

The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas

et al. 2018

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The c-C 4 F 8 gas is considered to have great potential as a gaseous medium for gas-insulated equipment, due to its good insulation properties and its relatively low greenhouse gas potential (GWP) relative to SF 6 . However, the decomposition is an important indicator of its use in equipment. In this paper, the decomposition characteristics of c-C 4 F 8 and the influence by oxygen have been explored through experiments and theoretical calculations. Firstly, the breakdown test of mixed gas was carried out and the precipitated elements of the electrodes and breakdown products of gas mixture were analyzed by X-ray photoelectron spectroscopy (XPS) and gas chromatography mass spectrometry (GC-MS). At the same time, the differences in decomposition products have also been studied when a small amount of O 2 was present. The path and mechanism of c-C 4 F 8 decomposition is then discussed, based on density functional theory (DFT). The results show that the black powdery substance descends on the electrode surface after the breakdown of the mixture of c-C 4

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“…Due to the difference in the experimental conditions, these studies can only provide reference for the mechanism of CF 2 O production in our experiments. Based on these studies as well as our team's computational study on the mechanism of CF 2 O production when studying the decomposition characteristics of CF 3 I, 43 the following pathways can be obtained.…”

Section: Effect Of Oxygen Concentration On the Decomposition Charactementioning

confidence: 99%

Effect of oxygen on power frequency breakdown voltage and decomposition characteristics of the C₅F₁₀O/N₂/O₂ gas mixture

Zhang

et al. 2019

RSC Adv.

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Formation mechanism of CF₃I discharge components and effect of oxygen on decomposition

Cited by 28 publications

References 19 publications

Alternative Environmentally Friendly Insulating Gases for SF6

Alternative Environmentally Friendly Insulating Gases for SF6

The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas

Effect of oxygen on power frequency breakdown voltage and decomposition characteristics of the C₅F₁₀O/N₂/O₂ gas mixture

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Formation mechanism of CF3I discharge components and effect of oxygen on decomposition

Cited by 28 publications

References 19 publications

Alternative Environmentally Friendly Insulating Gases for SF6

Alternative Environmentally Friendly Insulating Gases for SF6

The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas

Effect of oxygen on power frequency breakdown voltage and decomposition characteristics of the C5F10O/N2/O2 gas mixture

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Formation mechanism of CF₃I discharge components and effect of oxygen on decomposition

Effect of oxygen on power frequency breakdown voltage and decomposition characteristics of the C₅F₁₀O/N₂/O₂ gas mixture