The Resuming Insulation Discharge Failure and Conductor Overheating Failure Judgment Method of SF6 Electrical Equipment

Zhuang, Xiansheng; Li, Zhi; Cheng-ji, Huang

doi:10.4236/epe.2009.12019

Cited by 2 publications

(1 citation statement)

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“…Local overheating, PD and arc discharge are the common failures in electrical equipment [29]. PD and arc discharge are mostly caused by insulation defects in the devices.…”

Section: Decomposition Rate Of C-c 4 F 8 and C-c 4 F 8 /N 2 Gas Mixturementioning

confidence: 99%

Insights on decomposition process of c-C ₄ F ₈ and c-C ₄ F ₈ /N ₂ mixture as substitutes for SF ₆

Zhang

et al. 2018

R. Soc. open sci.

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In recent years, many scholars have carried out studies on c-C4F8 and its gas mixture and found it has potential to be used as an environment-friendly insulating medium to replace SF6 in medium-voltage equipment. In this paper, the c-C4F8 and c-C4F8/N2 gas mixture models were built to study its decomposition process by the combination of reactive molecular dynamics method and density functional theory. The yield of the main decomposition products, the reaction pathways and enthalpy under different temperatures were explored. It was found that the decomposition of c-C4F8/N2 mainly produces CF2, F, CF3, CF, C, CF4 and C2F4. c-C4F8 can decompose to C2F4 by absorbing 43.28 kcal/mol, which is the main decomposition path and this process easily occurs under high temperature. There is a dynamic equilibrium process among the various produced radicals, which ensures the insulation performance of system to a certain extent. The decomposition performance of c-C4F8/N2 mixture is better than that of pure c-C4F8 at the same temperature. Relevant results provide guidance for engineering application of the c-C4F8/N2 gas mixture.

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“…Local overheating, PD and arc discharge are the common failures in electrical equipment [29]. PD and arc discharge are mostly caused by insulation defects in the devices.…”

Section: Decomposition Rate Of C-c 4 F 8 and C-c 4 F 8 /N 2 Gas Mixturementioning

confidence: 99%

Insights on decomposition process of c-C ₄ F ₈ and c-C ₄ F ₈ /N ₂ mixture as substitutes for SF ₆

Zhang

et al. 2018

R. Soc. open sci.

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Influence of trace water on decomposition mechanism of c-C4F8 as environmental friendly insulating gas at high temperature

Xiao

Zhang

et al. 2018

AIP Advances

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Fluorocarbon gas has excellent environmental characteristics and insulation properties and has the potential of replacing SF6 for medium-voltage electrical equipment. While c-C4F8 will decompose under discharge or overheating faults conditions. At present, studies on the decomposition characteristics of c-C4F8 have made some achievements, but little attention has been paid to the influence of temperature and trace water. In this paper, the interaction between OH· and H· produced by H2O and c-C4F8 is analyzed based on the density functional theory (DFT) and plasma discharge decomposition experiment. The decomposition path, reaction enthalpy and activation energy, and the impact of temperature on the reaction path is discussed. It is found that the decomposition of c-C4F8 requires an endothermic heat of about 420 kJ/mol, and the decomposition of c-C4F8 to C2F4 is more likely to occur at high temperature. The H· and OH· generated by trace water will promote the decomposition of c-C4F8, which produces HF and low fluoride particles. The main decomposition products of c-C4F8 in the trace water environment are C2F4, CF4, CF3OH, CF3H, C2F6, CF2O and HF. Among them, CF2O and HF are toxic and corrosive substances, which pose a threat to the safety of operation and maintenance personnel. Relevant research results not only reveal the decomposition mechanism of c-C4F8, but also provide guidance for the application of c-C4F8 gas mixture.

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The Resuming Insulation Discharge Failure and Conductor Overheating Failure Judgment Method of SF6 Electrical Equipment

Cited by 2 publications

References 1 publication

Insights on decomposition process of c-C ₄ F ₈ and c-C ₄ F ₈ /N ₂ mixture as substitutes for SF ₆

Insights on decomposition process of c-C ₄ F ₈ and c-C ₄ F ₈ /N ₂ mixture as substitutes for SF ₆

Influence of trace water on decomposition mechanism of c-C4F8 as environmental friendly insulating gas at high temperature

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The Resuming Insulation Discharge Failure and Conductor Overheating Failure Judgment Method of SF6 Electrical Equipment

Cited by 2 publications

References 1 publication

Insights on decomposition process of c-C 4 F 8 and c-C 4 F 8 /N 2 mixture as substitutes for SF 6

Insights on decomposition process of c-C 4 F 8 and c-C 4 F 8 /N 2 mixture as substitutes for SF 6

Influence of trace water on decomposition mechanism of c-C4F8 as environmental friendly insulating gas at high temperature

Contact Info

Product

Resources

About

Insights on decomposition process of c-C ₄ F ₈ and c-C ₄ F ₈ /N ₂ mixture as substitutes for SF ₆

Insights on decomposition process of c-C ₄ F ₈ and c-C ₄ F ₈ /N ₂ mixture as substitutes for SF ₆