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Searching for eco-friendly alternative gases for SF6 has been a hot point in electrical engineering filed worldwide. This article reports a novel gas mixture with high performance in insulation, liquefaction and global warming potential (GWP). The mixed gas contains three gases of N2, C4F7N and CF3SO2F. Using stable steady Townsend (SST) experiment and breakdown test, the insulation performance of the ternary mixed gas was obtained. The results show that the (E/N)lim of the novel ternary gas mixture 10% C4F7N/20% CF3SO2F/70%N2 is about 5% higher than SF6. The breakdown voltage of 10% C4F7N/20% CF3SO2F/70%N2 is 15% higher than SF6 at 0.5 MPa. The calculated liquefaction temperature of 0.5 MPa 10% C4F7N/20% CF3SO2F/70%N2 is about -25℃. C4F7N/CF3SO2F/CO2 was also studied and its insulation performance was compared with CF3SO2F/C4F7N/N2 but was found to have poorer insulation performance. This study provides a solution for the development of high-performance SF6 alternative gases.

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Insulation Characteristics of the C4F7N-based Ternary Gas Mixture to Replace SF6 with Same Pressure

  • 会议论文

  • 发表日期：

    2025年

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  • Yapeng Xiao,
  • Ying Zhang,
  • Yu Zheng,
  • Chi Zhang,
  • Dongxin Hao,
  • Jianbo Shi,
  • Xuan Cai

摘要

Searching for eco-friendly alternative gases for SF6 has been a hot point in electrical engineering filed worldwide. This article reports a novel gas mixture with high performance in insulation, liquefaction and global warming potential (GWP). The mixed gas contains three gases of N2, C4F7N and CF3SO2F. Using stable steady Townsend (SST) experiment and breakdown test, the insulation performance of the ternary mixed gas was obtained. The results show that the (E/N)lim of the novel ternary gas mixture 10% C4F7N/20% CF3SO2F/70%N2 is about 5% higher than SF6. The breakdown voltage of 10% C4F7N/20% CF3SO2F/70%N2 is 15% higher than SF6 at 0.5 MPa. The calculated liquefaction temperature of 0.5 MPa 10% C4F7N/20% CF3SO2F/70%N2 is about -25℃. C4F7N/CF3SO2F/CO2 was also studied and its insulation performance was compared with CF3SO2F/C4F7N/N2 but was found to have poorer insulation performance. This study provides a solution for the development of high-performance SF6 alternative gases.