Abstract：Perfluoroisobutyronitrile(C4F7N) and its gas mixtures are new environmental-friendly insulating medium that have received extensive attention in recent years and may replace sulfur hexafluoride (SF6). In this paper ,in order to explore the potential of C4F7N/CO2 gas mixtures applied to highpressureelectrical equipment,the power frequency breakdown characteristics of C4F7N/CO2 gas mixtures at different mixing ratios and pressures were studied and compared with SF6 under the same conditionsthrough the gas insulated test platform and the mixing ratio range of C4F7N/CO2 gas mixtures applied in engineering practice was discussed in combination with the saturated vapor pressure characteristics. The results show that the breakdownvoltages of C4F7N/CO2 gas mixtures show saturated growth trend with the increase of pressure and mixing ratio in the experimental interval. The C4F7N/CO2 gas mixtures with C4F7N content of 10% and 20% can reach 80% and more than 95% of the SF6 insulation level under the same conditions, respectively, and there is a synergistic effect between C4F7N and CO2 gas. Considering factors such as power frequency breakdown strength and liquefaction temperature, the gas mixtures with C4F7N content of 4% to 12% have the potential to be applied to highpressure（0.4MPa~0.6MPa）gasinsulated equipment.
张晓星, 陈琪, 张季李, 祎肖淞. 高气压下环保型C4F7N/CO2混合气体工频击穿特性[J]. 电工技术学报, 2019, 34(13): 2839-2845.
Zhang Xiaoxing, Chen Qi, Zhang JiLi, Yi Xiao Song. Power Frequency Breakdown Characteristics of Environmental-Friendly C4F7N/CO2 Gas Mixtures under High Pressure Conditions. Transactions of China Electrotechnical Society, 2019, 34(13): 2839-2845.
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2019, Vol. 34 
