Study on Dispersion of Impulse Discharge in SF 6 and Eco-Friendly Insulating Gas C 4 F 7 N/CO 2

Tianran Zhang, Fang He (), Lubin Chang and Wenjun Zhou
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Tianran Zhang: School of Electrical Engineering, Naval University of Engineering, Wuhan 430030, China
Fang He: School of Electrical Engineering, Naval University of Engineering, Wuhan 430030, China
Lubin Chang: School of Electrical Engineering, Naval University of Engineering, Wuhan 430030, China
Wenjun Zhou: School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China

Energies, 2025, vol. 18, issue 13, 1-11

Abstract: In recent years, C 4 F 7 N/CO 2 gas has been widely studied as an eco-friendly alternative to SF 6 , which is commonly used in electrical equipment. To ensure electrical equipment reliability, the dispersion of impulse discharge voltage of insulated gas is generally required to be less than 3%. However, experimental results indicate that under fault conditions, such as sudden pressure changes or electric field distortion, the discharge dispersion of both C 4 F 7 N/CO 2 and SF 6 often exceeds 3%. This paper investigates the impact of pressure and electric field nonuniformity on the dispersion of impulse discharge voltage for conventional and eco-friendly insulating gases under varying degrees of electric field nonuniformity. Experiments reveal that under identical conditions, the 9%C 4 F 7 N/91%CO 2 mixture exhibits lower impulse discharge voltage dispersion compared with SF6. As pressure increases, the dispersion decreases for both gases. Conversely, dispersion increases with higher electric field nonuniformity, and the 9%C 4 F 7 N/91%CO 2 mixture demonstrates greater sensitivity to electric field nonuniformity than SF 6 . In practical applications, electrical equipment typically operates under slightly nonuniform electric fields and high pressure, meeting dispersion requirements. However, if electric field distortion causes the nonuniformity factor ( f ) to exceed 2.4 or if pressure drops below 0.3 MPa then dispersion increases significantly, reducing the reliability of insulation performance data.

Keywords: C 4 F 7 N/CO 2; SF 6; impulse discharge; dispersion (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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