Study on Power Frequency Breakdown and Decomposition Characteristics of SF 6 /N 2 Gas Mixture

Junbo Wang, Lijuan Liao (), Yalong Xia, Jianyuan Xu, Xin Lin and Zhenxin Geng
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Junbo Wang: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Lijuan Liao: State Grid Sichuan Electric Power Company Ziyang Power Supply Company, Ziyang 641300, China
Yalong Xia: State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China
Jianyuan Xu: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Xin Lin: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Zhenxin Geng: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2025, vol. 18, issue 21, 1-14

Abstract: The SF 6 /N 2 gas mixture is a key eco-friendly alternative to SF 6 in power equipment. However, its insulation and decomposition behaviors under realistic conditions of varying pressure and electric field non-uniformity remain insufficiently studied. This study establishes an experimental platform to systematically investigate the power–frequency breakdown and decomposition characteristics of a 3:7 SF 6 /N 2 mixture. Breakdown tests and critical field strength calculations were conducted under different pressures and electric field uniformities, followed by gas composition analysis. Results demonstrate that the proposed critical breakdown field strength method effectively predicts the mixture’s breakdown voltage. Furthermore, a range of decomposition products, including NF 3 , SOF 2 , CO 2 , and C 2 F 6 , were identified, whose concentrations generally decreased with rising pressure. These findings provide valuable experimental data and a predictive tool for optimizing the insulation design and condition monitoring of SF 6 /N 2 gas-insulated equipment.

Keywords: SF 6 /N 2 gas mixture; power frequency insulation characteristics; critical breakdown field strength; decomposition products (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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