Decomposition Characteristics of SF 6 under Arc Discharge and the Effects of Trace H 2 O, O 2, and PTFE Vapour on Its By-Products

Ren Yang, Mengyuan Xu, Jing Yan, Minghao Yang, Yingsan Geng, Zhiyuan Liu and Jianhua Wang
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Ren Yang: SGCC Shaanxi Electric Power Research Institute, Xi’an 710049, China
Mengyuan Xu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Jing Yan: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Minghao Yang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Yingsan Geng: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Zhiyuan Liu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Jianhua Wang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2021, vol. 14, issue 2, 1-13

Abstract: The research on decomposition characteristics of SF 6 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 SF 6 , SF 6 /polytetrafluoroethylene (PTFE), SF 6 /PTFE/O 2 , SF 6 /PTFE/H 2 O, and SF 6 /PTFE/O 2 /H 2 O were established by using Gibbs free energy minimization method, and the effects of trace H 2 O and O 2 impurities and PTFE vapour on SF 6 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 SF 6 circuit breaker, and a gas chromatograph was used to detect and analyse the SF 6 by-products. It was found that when PTFE vapour is involved in the arc plasma, the main by-product after arc quenching is CF 4 , and the molar fractions of C 2 F 6 and C 3 F 8 are very low. When O 2 is involved, the main by-products are SOF 2 , SO 2 and SO 2 F 2 , and a small amount of CO and CO 2 was also produced. When H 2 O is involved, the main by-products in simulation are SOF 2 , SO 2 and HF, and a small amount of SO 2 , CO 2 , CO, SO 2 F 2 and H 2 was also produced. The experimental results are in good agreement with the above results.

Keywords: SF 6 by-products; Gibbs free energy minimization method; breaking experiment; H 2 O and O 2 impurities; PTFE vapour (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: 2021
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