Investigation of the Arc Characteristics in a Nozzle with C 4 F 7 N/CO 2 Mixtures
Wen Wang,
Xianglian Yan,
Xiaolong Li (xiaolongli@sut.edu.cn),
Dongyu Guo and
Zhenxin Geng
Additional contact information
Wen Wang: State Key Laboratory of Power Grid Environmental Protection, Wuhan 430074, China
Xianglian Yan: State Key Laboratory of Power Grid Environmental Protection, Wuhan 430074, China
Xiaolong Li: State Key Laboratory of Power Grid Environmental Protection, Wuhan 430074, China
Dongyu Guo: 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, 2024, vol. 17, issue 18, 1-14
Abstract:
C 4 F 7 N is considered the most promising alternative to SF 6 due to its higher liquefaction temperature, and it is generally mixed with buffering gases such as CO 2 in engineering applications. This paper establishes a two-dimensional axisymmetric nozzle arc model based on magnetohydrodynamics, calculating the nozzle arc for air, SF 6 , and C 4 F 7 N/CO 2 mixtures. The simulation model’s accuracy is validated by comparing the calculation results for air with experimental data. This study focuses on comparing and analysing the temperature distribution, arc voltage, and energy balance characteristics of the nozzle arcs for SF 6 and C 4 F 7 N/CO 2 mixtures. By comparing the physical properties of the two gases, the differences in their arc characteristics are explained. Finally, the influence of different C 4 F 7 N concentrations on the arc characteristics of the mixed gas is compared. The results show that the arc voltage of the C 4 F 7 N/CO 2 mixtures is higher than that of the other two gases and increases asymptotically with the decrease in current. Among the three gases, the main form of arc energy dissipation is axial thermal convection, and both radial heat transfer and axial thermal convection are more significant in the C 4 F 7 N/CO 2 mixtures, resulting in the lowest arc temperature, which is more conducive to arc extinguishing. This study provides an in-depth explanation of the differences in arc morphology and temperature between SF 6 and C 4 F 7 N mixed gases by comparing their ρ C p and ρ h . The findings offer theoretical support for the design and optimisation of new environmentally friendly circuit breakers.
Keywords: SF 6 alternative gas; C 4 F 7 N/CO 2 mixtures; arc temperature; energy balance (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: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:18:p:4593-:d:1477295
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