典型电场下C4F7N/CO2/O2混合气体工频击穿特性研究

doi:10.19595/j.cnki.1000-6753.tces.220169

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Abstract Studies have shown that O₂ can inhibit the decomposition of C₄F₇N/CO₂ gas mixture, thereby improving the reliability of the gas engineering applications, however, there are few studies on the insulation characteristics of C₄F₇N/CO₂/O₂ gas mixture. To evaluate the influence of O₂ on the power frequency insulation characteristics of C₄F₇N/CO₂ gas mixture, a breakdown test platform was established in this paper, and the power frequency breakdown voltage under typical operating gas pressure, oxygen content and electric field form was obtained. The results show that with the increase of air pressure, the breakdown voltage of C₄F₇N/CO₂/O₂ gas mixture under the quasi uniform electric field with 1 mm gas gap is almost linearly increased, while it shows a certain saturation growth trend under slightly and extremely uneven electric fields, and the breakdown voltage shows a N-type variation law under the extremely uneven electric field with 6 mm gas gap. The breakdown voltage of C₄F₇N/CO₂/O₂ gas mixture is sensitive to the extremely uneven electric field at high air pressure and long gas gap, the breakdown voltage of 6 mm gas gap under extremely uneven electric field is close to that of 1 mm gas gap under slightly uneven field at 0.45MPa and above. O₂ has a certain negative impact on the breakdown voltage under certain air pressure and oxygen content, when 4%, 2%, 8%, 4%, 8% and 8% volume fraction of O₂ were added at 0.15MPa to 0.65MPa, the power frequency breakdown voltage decreases by only 6.2% at most. From the perspective of power frequency insulation design and improvement of gas chemical stability, adding 2% to 8% volume fraction O₂ is a feasible ternary gas mixture solution.

Key words： Typical electric field C₄F₇N/CO₂/O₂ gas mixture power frequency breakdown characteristics oxygen

Received: 29 January 2022

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	Yang Yuan
	Gao Keli
	Yuan Shuai
	Yan Xianglian
	Bi Jiangang

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Yang Yuan,Gao Keli,Yuan Shuai等. Research on the Power Frequency Breakdown Characteristics of C₄F₇N/CO₂/O₂ Gas Mixture under Typical Electric Fields[J]. Transactions of China Electrotechnical Society, 2022, 37(15): 3913-3922.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220169 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I15/3913

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