TY - GEN
T1 - Study on Power Frequency Breakdown Characteristics of Low-Content C4F7N Gas Mixtures Under Different Electric Field Uniformities
AU - Lu, Xianglin
AU - Wu, Yanze
AU - Yin, Ze
AU - Yan, Jing
AU - Yang, Jinggang
AU - Li, Xining
N1 - Publisher Copyright:
© Beijing Paike Culture Commu. Co., Ltd. 2026.
PY - 2026
Y1 - 2026
N2 - Sulfur hexafluoride (SF6), widely used in high-voltage switchgear, possesses a strong greenhouse effect, prompting an urgent need for environmentally friendly alternatives. Among them, C4F7N/CO2 gas mixtures are considered highly promising. As environmentally friendly power equipment is developed for higher voltage levels, the insulation performance of gas mixtures with low C4F7N content requires further investigation. This study explores the power frequency breakdown characteristics of low-content C4F7N gas mixtures under different electric field uniformities. The results show that the power frequency breakdown voltage exhibits a strong dependence on the electric field distribution. Under highly inhomogeneous fields, the gas mixtures display a nonlinear saturation effect in breakdown voltage, with the pressure-dependent increase reduced by 30%–50% compared to that under slightly inhomogeneous conditions. In slightly inhomogeneous fields, adding 4%–8% O2 improves insulation performance by up to 9.35%. However, under highly inhomogeneous conditions, increasing the O2 concentration to 12% is required to enhance the dielectric strength effectively.
AB - Sulfur hexafluoride (SF6), widely used in high-voltage switchgear, possesses a strong greenhouse effect, prompting an urgent need for environmentally friendly alternatives. Among them, C4F7N/CO2 gas mixtures are considered highly promising. As environmentally friendly power equipment is developed for higher voltage levels, the insulation performance of gas mixtures with low C4F7N content requires further investigation. This study explores the power frequency breakdown characteristics of low-content C4F7N gas mixtures under different electric field uniformities. The results show that the power frequency breakdown voltage exhibits a strong dependence on the electric field distribution. Under highly inhomogeneous fields, the gas mixtures display a nonlinear saturation effect in breakdown voltage, with the pressure-dependent increase reduced by 30%–50% compared to that under slightly inhomogeneous conditions. In slightly inhomogeneous fields, adding 4%–8% O2 improves insulation performance by up to 9.35%. However, under highly inhomogeneous conditions, increasing the O2 concentration to 12% is required to enhance the dielectric strength effectively.
KW - insulation properties
KW - low CFN content
KW - Power frequency breakdown characteristics
KW - uniformity of electric field
UR - https://www.scopus.com/pages/publications/105041276478
U2 - 10.1007/978-981-92-0561-5_43
DO - 10.1007/978-981-92-0561-5_43
M3 - 会议稿件
AN - SCOPUS:105041276478
SN - 9789819205608
T3 - Lecture Notes in Electrical Engineering
SP - 401
EP - 409
BT - Proceedings of the 5th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU2025 - Volume 1
A2 - Chi, Qingguo
A2 - Zhang, Tiandong
A2 - Yang, Fei
A2 - Zhang, Jinbo
PB - Springer Science and Business Media Deutschland GmbH
T2 - 5th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2025
Y2 - 29 August 2025 through 31 August 2025
ER -