Compositions of SF6 - H2O Decaying Arc at a Temperature Range of 1000-12000 K

Yuwei Fu; Xiaohua Wang; Aijun Yang; Jiandong Duan

doi:10.1109/CMD.2018.8535786

Compositions of SF₆ - H₂O Decaying Arc at a Temperature Range of 1000-12000 K

Yuwei Fu
, Xiaohua Wang
, Aijun Yang
, Jiandong Duan

School of Electrical Engineering

Xi'an University of Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

SF₆ has been widely used as insulating and arc-extinguishing medium in power equipment. But under arc discharges, lower fluorides of sulfur (like SF₅, SF₄and SF3) generated by the dissociations of SF₆will react with unavoidable atoms (like O and H) released from trace impurities of moisture to form corrosive byproducts such as SOF₂, SO₂F₂, SOF₄and so on. These byproducts will reduce the insulating and arc-quenching capacity of SF₆-insulated power equipment, so it is necessary to study the compositions of decaying SF₆arc plasma in the presence of H₂O. In this paper, both non-chemical and non-thermodynamic equilibriums are taken into consideration employing chemical kinetic model. The elementary reactions of SF₆with H₂O are determined by density functional theory and the rate coefficients are computed with transition state theory. Then we calculated the temperature-varying molar fractions of main byproducts SOF₂, SO₂F₂and SOF₄under different contents of H₂O. We also analyzed the dominant reactions in different selected temperature ranges. This work can lay a theoretical basis for insulating condition monitoring and diagnosis of SF₆-insulated power equipment based on characteristic decomposition products.

Original language	English
Title of host publication	2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings
Editors	Ahmed Abu-Siada
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781538641262
DOIs	https://doi.org/10.1109/CMD.2018.8535786
State	Published - 14 Nov 2018
Event	7th International Conference on Condition Monitoring and Diagnosis, CMD 2018 - Perth, Australia Duration: 23 Sep 2018 → 26 Sep 2018

Publication series

Name	2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings

Conference

Conference	7th International Conference on Condition Monitoring and Diagnosis, CMD 2018
Country/Territory	Australia
City	Perth
Period	23/09/18 → 26/09/18

Keywords

chemical kinetic model
composition variation
decaying SF6 arc
impurities
non-equilibrium

Access to Document

10.1109/CMD.2018.8535786

Cite this

Fu, Y., Wang, X., Yang, A., & Duan, J. (2018). Compositions of SF₆ - H₂O Decaying Arc at a Temperature Range of 1000-12000 K. In A. Abu-Siada (Ed.), 2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings Article 8535786 (2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CMD.2018.8535786

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title = "Compositions of SF6 - H2O Decaying Arc at a Temperature Range of 1000-12000 K",

abstract = "SF6 has been widely used as insulating and arc-extinguishing medium in power equipment. But under arc discharges, lower fluorides of sulfur (like SF5, SF4and SF3) generated by the dissociations of SF6will react with unavoidable atoms (like O and H) released from trace impurities of moisture to form corrosive byproducts such as SOF2, SO2F2, SOF4and so on. These byproducts will reduce the insulating and arc-quenching capacity of SF6-insulated power equipment, so it is necessary to study the compositions of decaying SF6arc plasma in the presence of H2O. In this paper, both non-chemical and non-thermodynamic equilibriums are taken into consideration employing chemical kinetic model. The elementary reactions of SF6with H2O are determined by density functional theory and the rate coefficients are computed with transition state theory. Then we calculated the temperature-varying molar fractions of main byproducts SOF2, SO2F2and SOF4under different contents of H2O. We also analyzed the dominant reactions in different selected temperature ranges. This work can lay a theoretical basis for insulating condition monitoring and diagnosis of SF6-insulated power equipment based on characteristic decomposition products.",

keywords = "chemical kinetic model, composition variation, decaying SF6 arc, impurities, non-equilibrium",

author = "Yuwei Fu and Xiaohua Wang and Aijun Yang and Jiandong Duan",

note = "Publisher Copyright: {\textcopyright} 2018 IEEE.; 7th International Conference on Condition Monitoring and Diagnosis, CMD 2018 ; Conference date: 23-09-2018 Through 26-09-2018",

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Fu, Y, Wang, X , Yang, A & Duan, J 2018, Compositions of SF₆ - H₂O Decaying Arc at a Temperature Range of 1000-12000 K. in A Abu-Siada (ed.), 2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings., 8535786, 2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings, Institute of Electrical and Electronics Engineers Inc., 7th International Conference on Condition Monitoring and Diagnosis, CMD 2018, Perth, Australia, 23/09/18. https://doi.org/10.1109/CMD.2018.8535786

Compositions of SF₆ - H₂O Decaying Arc at a Temperature Range of 1000-12000 K. / Fu, Yuwei; Wang, Xiaohua ; Yang, Aijun et al.
2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings. ed. / Ahmed Abu-Siada. Institute of Electrical and Electronics Engineers Inc., 2018. 8535786 (2018 Condition Monitoring and Diagnosis, CMD 2018 - Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - SF6 has been widely used as insulating and arc-extinguishing medium in power equipment. But under arc discharges, lower fluorides of sulfur (like SF5, SF4and SF3) generated by the dissociations of SF6will react with unavoidable atoms (like O and H) released from trace impurities of moisture to form corrosive byproducts such as SOF2, SO2F2, SOF4and so on. These byproducts will reduce the insulating and arc-quenching capacity of SF6-insulated power equipment, so it is necessary to study the compositions of decaying SF6arc plasma in the presence of H2O. In this paper, both non-chemical and non-thermodynamic equilibriums are taken into consideration employing chemical kinetic model. The elementary reactions of SF6with H2O are determined by density functional theory and the rate coefficients are computed with transition state theory. Then we calculated the temperature-varying molar fractions of main byproducts SOF2, SO2F2and SOF4under different contents of H2O. We also analyzed the dominant reactions in different selected temperature ranges. This work can lay a theoretical basis for insulating condition monitoring and diagnosis of SF6-insulated power equipment based on characteristic decomposition products.

AB - SF6 has been widely used as insulating and arc-extinguishing medium in power equipment. But under arc discharges, lower fluorides of sulfur (like SF5, SF4and SF3) generated by the dissociations of SF6will react with unavoidable atoms (like O and H) released from trace impurities of moisture to form corrosive byproducts such as SOF2, SO2F2, SOF4and so on. These byproducts will reduce the insulating and arc-quenching capacity of SF6-insulated power equipment, so it is necessary to study the compositions of decaying SF6arc plasma in the presence of H2O. In this paper, both non-chemical and non-thermodynamic equilibriums are taken into consideration employing chemical kinetic model. The elementary reactions of SF6with H2O are determined by density functional theory and the rate coefficients are computed with transition state theory. Then we calculated the temperature-varying molar fractions of main byproducts SOF2, SO2F2and SOF4under different contents of H2O. We also analyzed the dominant reactions in different selected temperature ranges. This work can lay a theoretical basis for insulating condition monitoring and diagnosis of SF6-insulated power equipment based on characteristic decomposition products.

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