Decomposition Properties of C4F7N/N2 Gas Mixture: An Environmentally Friendly Gas to Replace SF6

Li, Yalong; Xiao, Song; Chen, Qi; Tang, Ju; Chen, Dachang; Wang, Dibo

doi:10.1021/acs.iecr.8b00010

Cited by 135 publications

(77 citation statements)

References 33 publications

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“…Overall, the toxicity of the products was lower than that of the products of SF 6 decomposition, and was acceptable. Besides, N 2 was more likely to decompose than C 4 F 7 N. Thus, it acted as buffer gas and avoided the excessive decomposition of C 4 F 7 N, which ensured the insulation performance [56]. For C 4 F 7 N, the decomposed products were mainly C 3 F 7 , CN, CNF, CF 3 , CF 2 , CF, CF 3 CFCN(C 3 NF 4 ), F, other free radicals, and CF 4 .…”

Section: Fluoronitrile (C 4 F 7 N)mentioning

confidence: 99%

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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: Fluoronitrile (C 4 F 7 N)mentioning

confidence: 99%

“…Processes 2019, 7, x FOR PEER REVIEW 10 of 14 Figure 6. Probable decomposition pathways of C4F7N/N2 [56].…”

Section: Fluoronitrile (C 4 F 7 N)mentioning

confidence: 99%

Alternative Environmentally Friendly Insulating Gases for SF6

Wang¹,

Huang²,

Liu³

et al. 2019

Processes

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“…Meanwhile, more values in the E/N that varied from 750 to 1150 Td were obtained in the present work. According to the bond length values of the C4F7N molecule [21], the structure of the C4F7N molecule could be drawn as in Figure 5. A recent study [22] shows that the bonds of C-1 to C-2 and C-1 to C-3 have the smallest bond energy, which is 3.812 eV/atom.…”

Section: Effective Ionization Coefficientsmentioning

confidence: 99%

“…Then, SF6 is more likely to exhibit ionization characteristics, which could lead to the higher effective ionization coefficients of SF6 than that of C4F7N for the same E/N. According to the bond length values of the C 4 F 7 N molecule [21], the structure of the C 4 F 7 N molecule could be drawn as in Figure 5. A recent study [22] shows that the bonds of C-1 to C-2 and C-1 to C-3 have the smallest bond energy, which is 3.812 eV/atom.…”

Section: Effective Ionization Coefficientsmentioning

confidence: 99%

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

et al. 2019

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The normalized Townsend first ionization coefficient α/N and normalized attachment coefficient η/N in pure C4F7N were measured by using the steady-state Townsend (SST) method for a range of reduced electric fields E/N from 750 to 1150 Td at room temperature (20 °C). Meanwhile, the effective ionization coefficients are obtained. All SST experimental results show good agreement with pulsed Townsend (PT) experiment results. Comparisons of the critical electric fields of C4F7N with SF6 and other alternative gases such as c-C4F8 and CF3I indicate that C4F7N has a better insulation performance with a much higher normalized critical electric field at 959.19 Td.

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“…The chemical characteristics of the gas are similar to those of fluoro organic gas, and the chemical characteristics are relatively stable, which can achieve good compatibility with other materials in electrical equipment. The relative molecular weight of C 4 F 7 N is 195.0, and it also has a high liquefaction temperature, which is −4.7°C [29]. Therefore, it also needs to be mixed with buffer gas.…”

Section: F 7 Nmentioning

confidence: 99%

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Zhao¹,

Xiao²

2020

Modern Applications of Electrostatics and Dielectrics

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Synergetic effect is a special gas discharge phenomenon among insulating gas mixtures, which has important reference value for gas selection of future gasinsulated power equipment. The research progress and investigation methods of synergistic effect and insulation characteristics of different gas mixtures at home and abroad are reviewed in this chapter. The synergistic effect between different kinds of gas mixtures including SF 6 gas mixtures and some new insulation gases such as cC 4 F 8 , CF 3 I, and C 4 F 7 N is presented. Combined with the results of multiple studies, it can be seen that the synergistic effect of the gas mixture has a certain relationship with the electronic transport parameters and discharge patterns. Besides, the synergistic effect of the same gas mixture may change with the change of external conditions such as gas pressure, voltage type, and electrode distance.

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Decomposition Properties of C₄F₇N/N₂ Gas Mixture: An Environmentally Friendly Gas to Replace SF₆

Cited by 135 publications

References 33 publications

Alternative Environmentally Friendly Insulating Gases for SF6

Alternative Environmentally Friendly Insulating Gases for SF6

Ionization and Attachment Coefficients in C4F7N Gas Measured by the Steady-State Townsend Method

Research Progress on Synergistic Effect between Insulation Gas Mixtures

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