Experimental and Theoretical Studies of Over-Thermal Decomposition of SF<inf>6</inf>/N<inf>2</inf> Mixture

Fuping Zeng; Rijian Cai; Chen Li; Binquan Xie; Shiling Zhang; Qiang Yao; Ju Tang

doi:10.17775/CSEEJPES.2022.06270

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Experimental and Theoretical Studies of Over-Thermal Decomposition of SF6/N2 Mixture

Regular Papers | 更新时间：2026-10-10

- Experimental and Theoretical Studies of Over-Thermal Decomposition of SF6/N2 Mixture
- CSEE Journal of Power and Energy Systems Vol. 12, Issue 5, Pages: 2618-2625(2026)
- 作者机构：
  
  1. School of Electrical Engineering and Automation of Wuhan University,Wuhan,China
  2. Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy Resources,Wuhan,China
  3. Guangzhou Power Supply Bureau Corporation,Guangzhou,China
  4. State Grid Chongqing Electric Power Research Institute,Chongqing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.06270
  CLC：
- Published：01 September 2026
- 稿件说明：
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Fuping Zeng, Rijian Cai, Chen Li, et al. Experimental and Theoretical Studies of Over-Thermal Decomposition of SF6/N2 Mixture[J]. CSEE Journal of Power and Energy Systems, 2026, 12(5): 2618-2625. DOI: 10.17775/CSEEJPES.2022.06270.
DOI：

Fuping Zeng, Rijian Cai, Chen Li, et al. Experimental and Theoretical Studies of Over-Thermal Decomposition of SF6/N2 Mixture[J]. CSEE Journal of Power and Energy Systems, 2026, 12(5): 2618-2625. DOI: 10.17775/CSEEJPES.2022.06270. DOI：

摘要

Abstract

In order to relieve the greenhouse effect caused by SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6

using SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6/N<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2 mixture gas instead of pure SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6 as the insulation medium of GIS is an effective technical means. However

there is still a lack of research on the over-thermal decomposition characteristics of SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6/N<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2 at present

let alone its over-thermal decomposition mechanism. Therefore

in this paper

to explore the decomposition characteristics of SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6/N<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2 at different fault temperatures

a large number of partial over-thermal fault experiments are conducted in the range of 550°C to 650°C. The experiment results show that the initial formation temperature of NF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3is 575°C

while S containing products (SO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2

SOF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2

SOF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4and SO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2F<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2) are generated in large quantities under the same conditions

and nitrogen oxides (NO and NO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2) are already generated at 550°C. When the temperature is between 550°C and 650°C

around 1.3%-4.0% of the SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6 decomposed

while the decomposition percentage of N<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2is only 0.003 to 0.017. In addition

according to calculated thermodynamic and kinetic parameters of the reactions

which are related to the thermal decomposition of SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6/N<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2

it can be found the orders of magnitude of the reaction rate constant of reactions between SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4

SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2and impurities O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2

H<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2O are higher than 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">20

and the same holds true for the hydrolysis reaction of SOF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2. It explains why yields of SO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2and SOF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2are large during the experiment. As for nitrogenous products

the reaction rate constant of the formation of NO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">xis much higher than NF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3

which reveals why the concentration of (NO+NO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2) is larger than that of NF3 in the experiment.

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Experimental and Theoretical Studies of Over-Thermal Decomposition of SF6/N2 Mixture

DOI：10.17775/CSEEJPES.2022.06270

摘要

Abstract

关键词

Keywords

references