Power Frequency Breakdown Characteristics of CF<sub>3</sub>SO<sub>2</sub>F Ternary Mixed Gas

ZHENG Yu; HAO Dongxin; LIU Wei; REN Shubo; YAN Xianglian; GAO Keli; ZHOU Wenjun

doi:10.13334/j.0258-8013.pcsee.242550

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Power Frequency Breakdown Characteristics of CF₃SO₂F Ternary Mixed Gas

更新时间：2026-06-26

- Power Frequency Breakdown Characteristics of CF₃SO₂F Ternary Mixed Gas
- Vol. 46, Issue 1, Pages: 424-434(2026)
- 作者机构：
  
  1. 电网环境保护全国重点实验室(武汉大学),湖北省,武汉市,430072
  2. 国网安徽省电力有限公司电力科学研究院,安徽省,合肥市,230000
  3. 中国电力科学研究院有限公司，北京市海淀区,100192
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.242550
  CLC：
- Published：2026
- 稿件说明：
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ZHENG Yu, HAO Dongxin, LIU Wei, et al. Power Frequency Breakdown Characteristics of CF₃SO₂F Ternary Mixed Gas[J]. 2026, 46(1): 424-434. DOI: 10.13334/j.0258-8013.pcsee.242550.
DOI：

ZHENG Yu, HAO Dongxin, LIU Wei, et al. Power Frequency Breakdown Characteristics of CF₃SO₂F Ternary Mixed Gas[J]. 2026, 46(1): 424-434. DOI: 10.13334/j.0258-8013.pcsee.242550. DOI：

摘要

为优化气体配方以降低环保气体绝缘设备中的气体压力，该文开展CF3SO2F三元混合气体工频击穿特性研究。试验获得0.1~0.5 MPa气压范围内，CF3SO2F三元混合气体在稍不均匀电场中的工频击穿特性，并研究缓冲气体类型、气压、比例以及低温对其绝缘强度的影响规律。结果表明，在相同混合比例和气压下，混合N2的CF3SO2F三元混合气体击穿电压高于混合CO2的三元混合气体；0.1~0.5 MPa范围内，CF3SO2F三元混合气体的工频击穿电压均随气压增大而呈线性增大趋势；从20℃降温至-40℃过程中，其绝缘强度在温度高于-20℃时基本保持不变，温度低于-20℃时其绝缘强度显著降低。优选得到20%CF3SO2F/10%C4F7N/ 70%N2的三元混合气体配方，其在0.5 MPa下的绝缘强度可达到相同气压下SF6气体的1.15倍，且液化温度不高于-20℃。该文可为环保气体绝缘设备的配方优化提供一定参考。

Abstract

To optimize gas formulations for reducing the gas pressure in eco-friendly gas-insulated equipment

this study investigates the power frequency breakdown characteristics of CF3SO2F ternary gas mixtures. Experiments are conducted to obtain the breakdown characteristics of CF3SO2F ternary mixtures in slightly non-uniform electric fields under pressures ranging from 0.1 to 0.5 MPa. The effects of buffer gas type

pressure

mixing ratio

and low temperature on insulation strength are analyzed. Results show that under identical mixing ratios and pressures

CF3SO2F mixtures with N2 exhibit higher breakdown voltages than those with CO2. Breakdown voltages demonstrate linear growth with increasing pressure from 0.1 to 0.5 MPa. The insulation strength remains stable when temperature decreases from 20℃ to -20℃ but significantly declines below -20℃. The optimized 20%CF3SO2F/ 10%C4F7N/70%N2 ternary mixture demonstrates an insulation strength 15% higher than that of SF6 at 0.5 MPa while its liquefaction temperature remains below 20℃. This research provides valuable references for developing alternative gases of eco-friendly gas-insulated equipment.

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Power Frequency Breakdown Characteristics of CF3SO2F Ternary Mixed Gas

DOI：10.13334/j.0258-8013.pcsee.242550

摘要

Abstract

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Power Frequency Breakdown Characteristics of CF₃SO₂F Ternary Mixed Gas