Influence of trace H
 2
 O and O
 2
 on SF
 6
 decomposition products under arcing conditions in electric power equipment

Ren, Yang; Xu, Mengyuan; Guan, Chen; Yan, Jing; Geng, Yingsan

doi:10.1049/joe.2018.8832

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…The concentrations of these byproducts decreased in the following order: SOF 2 +SO 2 > CF 4 > SO 2 F 2 . Our previous work used a circuit breaker to study the influence of trace H 2 O and O 2 on SF 6 by-products [13]. We found that the increase of the concentration of H 2 O and O 2 will increase the production of SOF 2 +SO 2 , and the concentration of CF 4 is hardly affected by the concentration of H 2 O and O 2 .…”

Section: Introductionmentioning

confidence: 88%

Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O2, and PTFE Vapour on Its By-Products

Ren

Yan

et al. 2021

Energies

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The research on decomposition characteristics of SF6 and its by-products have great significance to the operation, maintenance, condition assessment and fault diagnosis of power equipment. In this paper, the particle composition models of SF6, SF6/polytetrafluoroethylene (PTFE), SF6/PTFE/O2, SF6/PTFE/H2O, and SF6/PTFE/O2/H2O were established by using Gibbs free energy minimization method, and the effects of trace H2O and O2 impurities and PTFE vapour on SF6 by-products were studied by the models. In order to verify the correctness of the simulation results, a series of breaking experiments were carried out on a 40.5 kV SF6 circuit breaker, and a gas chromatograph was used to detect and analyse the SF6 by-products. It was found that when PTFE vapour is involved in the arc plasma, the main by-product after arc quenching is CF4, and the molar fractions of C2F6 and C3F8 are very low. When O2 is involved, the main by-products are SOF2, SO2 and SO2F2, and a small amount of CO and CO2 was also produced. When H2O is involved, the main by-products in simulation are SOF2, SO2 and HF, and a small amount of SO2, CO2, CO, SO2F2 and H2 was also produced. The experimental results are in good agreement with the above results.

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Section: Introductionmentioning

confidence: 88%

Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O2, and PTFE Vapour on Its By-Products

Ren

Yan

et al. 2021

Energies

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“…Sulfur hexafluoride (SF 6 ) has been widely used in gas‐insulated equipment such as gas insulated switchgear (GIS) and gas insulated transmission line (GIL) due to its good insulation performance [1] . Studies have shown that when a discharge or local overheating failure occurs in GIS/GIL, SF 6 will decompose to generate many characteristic decomposition products, such as SOF 4 , SO 2 F 2 , SOF 2 , SO 2 , HF, H 2 S, etc [2–4] . Since the content and change rule of the characteristic products are closely related to the fault type and fault degree of the equipment, the working status of the GIS/GIL can be effectively obtained by monitoring the content of these decomposition components [3] .…”

Section: Introductionmentioning

confidence: 99%

“…Studies have found that trace O 2 or trace H 2 O in the closed gas chamber have a great influence on the production of oxygen‐containing decomposition products of SF 6 , but the generation rules and influence mechanisms are still unclear. At present, scholars have obtained the basic characteristics of the decomposition products of SF 6 in trace‐oxygen and trace‐water environments through experiments and quantum chemical calculations [4–9] . However, due to the limitations of experimental methods and detection techniques, the reproducibility of experimental results is relatively poor.…”

Section: Introductionmentioning

confidence: 99%

Development of ReaxFF_SFOH Force Field for SF₆‐H₂O/O₂ Hybrid System Based on Synergetic Optimization by CMA‐ES and MC Methodology

Liu

Wang

et al. 2021

ChemistrySelect

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The reactive force field (ReaxFF) based molecular dynamic (MD) simulation provides a new perspective for studying the microscopic decomposition mechanism of sulfur hexafluoride (SF6) under fault conditions. Since none of the published ReaxFF force fields contains proper interaction relationship between S, F, O and H elements, the development of ReaxFF parameters for SF6‐H2O/O2 hybrid system is urgently needed. In this work, a universal and efficient covariance matrix adaptation evolutionary strategy (CMA‐ES) and Monte‐Carlo FF (MCFF) synergetic (CMS) optimization strategy for ReaxFF parameter is proposed. The optimization results for two representative force fields (disulfide and silica) from literature show that under the same number of evaluations, the CMS optimization strategy significantly reduces the optimization error by 22.08 % (disulfide) and 10.3 % (silica) respectively. By applying CMS strategy, the ReaxFFSFOH force field for SF6‐H2O/O2 hybrid system is efficiently obtained. Through multi‐dimensional force field performance verification, we find that the bond length calculation error between ReaxFF and density functional theory (DFT) calculation results is mainly concentrated within ±0.05 Å, and the bond angle error is mostly within ±5°. In addition, the trends of relative energy changes during chemical reaction processes calculated by ReaxFF are basically consistent with the DFT results. This work lays a solid foundation for the in‐depth study of the microscopic influence mechanism of trace H2O and trace O2 in the decomposition process of SF6.

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“…Yang et al studied the influence mechanism of O 2 content on the decomposition products of SF 6 under arc discharge. 7 Tang et al studied the influence of O 2 on the generation of SO 2 F 2 and SOF 2 in the case of partial discharge failures caused by metal protrusions. 8 Lin et al analyzed the sequence of chemical reactions during the formation of SF 6 -oxygenated decomposition products through an O isotope tracking method.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al. studied the influence mechanism of O 2 content on the decomposition products of SF 6 under arc discharge . Tang et al studied the influence of O 2 on the generation of SO 2 F 2 and SOF 2 in the case of partial discharge failures caused by metal protrusions .…”

Section: Introductionmentioning

confidence: 99%

Study on Pyrolysis Characteristics of SF₆ in a Trace-Oxygen (O₂) Environment: ReaxFF_SFO Force Field Optimization and Reactive Molecular Dynamics Simulation

Liu

Wang

et al. 2020

ACS Omega

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The ReaxFF SFO force field for a SF 6 –O 2 system is developed based on the density functional theory (DFT) calculation data. Then, a series of molecular dynamics (MD) simulations were performed. The results show that the main oxygen-containing compounds that appeared in the MD simulation include SOF 4 , SOF 2 , and SO 2 F 2 . The relative quantitative relationship between SOF 2 and SOF 4 can be used to determine the fault temperature. Besides, under overheating conditions, O 2 rarely undergoes a self-cracking process to generate free O atoms. Instead, the basic route for O 2 to participate in the SF 6 pyrolysis process is X + Y + O 2 = XO + YO. Furthermore, the reactivity order of various groups to O 2 is (SF 2 )* > (SF 3 )* > (SF 4 )* > F*, so O 2 is more likely to participate in the reaction by attacking (SF 3 )* or (SF 2 )* groups. This study laid the foundation for the application of ReaxFF MD simulations to study the microscopic dynamic mechanism of SF 6 pyrolysis in more complex systems.

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Influence of trace H ₂ O and O ₂ on SF ₆ decomposition products under arcing conditions in electric power equipment

Cited by 7 publications

References 8 publications

Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O2, and PTFE Vapour on Its By-Products

Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O2, and PTFE Vapour on Its By-Products

Development of ReaxFF_SFOH Force Field for SF₆‐H₂O/O₂ Hybrid System Based on Synergetic Optimization by CMA‐ES and MC Methodology

Study on Pyrolysis Characteristics of SF₆ in a Trace-Oxygen (O₂) Environment: ReaxFF_SFO Force Field Optimization and Reactive Molecular Dynamics Simulation

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Influence of trace H 2 O and O 2 on SF 6 decomposition products under arcing conditions in electric power equipment

Cited by 7 publications

References 8 publications

Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O2, and PTFE Vapour on Its By-Products

Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O2, and PTFE Vapour on Its By-Products

Development of ReaxFFSFOH Force Field for SF6‐H2O/O2 Hybrid System Based on Synergetic Optimization by CMA‐ES and MC Methodology

Study on Pyrolysis Characteristics of SF6 in a Trace-Oxygen (O2) Environment: ReaxFFSFO Force Field Optimization and Reactive Molecular Dynamics Simulation

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Product

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Influence of trace H ₂ O and O ₂ on SF ₆ decomposition products under arcing conditions in electric power equipment

Development of ReaxFF_SFOH Force Field for SF₆‐H₂O/O₂ Hybrid System Based on Synergetic Optimization by CMA‐ES and MC Methodology

Study on Pyrolysis Characteristics of SF₆ in a Trace-Oxygen (O₂) Environment: ReaxFF_SFO Force Field Optimization and Reactive Molecular Dynamics Simulation