C3F7CN/N2混合气体的直流击穿特性

doi:10.19595/j.cnki.1000-6753.tces.180735

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Abstract In recent years, finding environment-friendly gases substituted to SF₆ in DC GIL has become a hot issue in the electricity field, and C₃F₇CN is one of the potential substitutes. In this paper, the DC breakdown characteristics of C₃F₇CN/N₂ gas mixtures under uniform electric field were studied and the results were compared with SF₆, SF₆/N₂ gas mixtures and C₃F₇CN/CO₂ gas mixtures. The content of C₃F₇CN was 8%~16% with the gas pressure range from 0.3MPa to 0.7MPa. The results and analysis showed that the positive and negative DC breakdown field strengths of C₃F₇CN/N₂ gas mixture decrease with the decrease of gas pressure. With the increase of C₃F₇CN content in the mixed gas by 20%, the negative breakdown field strength of 14% C₃F₇CN/86%N₂ at 0.7MPa reaches 87.3% of SF₆ at 0.4MPa. At the same gas pressure, the DC breakdown field strength of 8%C₃F₇CN/92%N₂ gas mixture is the lowest, 8%C₃F₇CN/92%CO₂ is higher, and 20%SF₆/80% N₂ is the highest. Through X-ray photoelectron spectroscopy (XPS) detection, the discharge by-products on the electrodes surface were analyzed and the possible reactions process between C₃F₇CN/N₂ gas mixture and electrodes were obtained.

Key words： C₃F₇CN/N₂ gas mixture DC breakdown characteristics X-ray photoelectron spectroscopy discharge by-products

Received: 02 May 2018 Published: 27 November 2018

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TM855

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	Tu Youping
	Ai Xin
	Cheng Yi
	Jin Hua
	Wang Cong

Cite this article:

Tu Youping,Ai Xin,Cheng Yi等. DC Breakdown Characteristics of C₃F₇CN/N₂ Gas Mixtures[J]. Transactions of China Electrotechnical Society, 2018, 33(22): 5189-5195.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180735 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I22/5189

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