C4F7N/CO2混合气体对局部不均匀电场的敏感特性

doi:10.19595/j.cnki.1000-6753.tces.190784

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Abstract

The discharge characteristics of electron-attaching gases are sensitive to non-uniform electric field. However, it is difficult to make the electrode surface completely smooth in high-voltage electrical equipment. The effect of surface roughness of electrodes is prominent when the pressure is high, thus reducing the gas insulation performance. C₄F₇N/CO₂ gas mixture is a potential alternative gas to SF₆. It is necessary to investigate the sensitivity of C₄F₇N/CO₂ to inhomogeneous electric field distribution. In this paper, the local electric field distortion caused by rough electrode surface is analyzed theoretically, and the influence of electric field distortion on the insulation performance of C₄F₇N/CO₂ is calculated. The figure of merit is proposed to evaluate the tolerance of C₄F₇N/CO₂ gas mixture to inhomogeneous electric field. Compared with SF₆, when the content of C₄F₇N is less than 20%, the figure of merit of C₄F₇N/CO₂ mixture is higher than that of SF₆, which increases with the content of C₄F₇N decreasing. In order to verify the calculation results, a rough electrode discharge model was developed. The discharge tests of C₄F₇N/CO₂ and SF₆ gases were carried out. The figures of merit of C₄F₇N/CO₂ with 10% C₄F₇N content and SF₆ gases were obtained, which were close to the calculation results. Based on the figures of merit of C₄F₇N/CO₂ gas mixture, and considering the controlling requirement of electrode surface roughness in C₄F₇N/CO₂ gas mixture equipment with the same insulation performance as that of SF₆, it shows that as the content of C₄F₇N is in the range of 4%~20%, the controlling requirement of electrode surface roughness of 6.3μm in SF₆ equipment is suitable for the design of C₄F₇N/CO₂equipment.

Key words： C₄F₇N/CO₂gas mixture SF₆ gas electrode surface roughness gas discharge merit

Received: 30 June 2019 Published: 17 January 2020

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TM56

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	Yan Xianglian
	Zheng Yu
	Huang He
	Yang Yuan
	Zhou Wenjun
	Bai changyu

Cite this article:

Yan Xianglian,Zheng Yu,Huang He等. Sensitivity of C₄F₇N/CO₂ Gas Mixture to Partial Inhomogeneous Electric Field[J]. Transactions of China Electrotechnical Society, 2020, 35(1): 43-51.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190784 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I1/43

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