局部过热下C<sub>3</sub>F<sub>7</sub>CN/EP气固绝缘系统劣化特性

doi:10.19595/j.cnki.1000-6753.tces.201724

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Abstract C₃F₇CN/CO₂ gas mixtures is considered to be one of the most potential SF₆alternative gases. The research on the degradation characteristics of environmental-friendly gas-solid insulation systems on partial overheating defects can provide a reference for formulating the operation and maintenance strategy of environmental-friendly electrical equipment. In this paper, a partial overheating experimental platform was established, and the degradation experiments of C₃F₇CN/EP at different temperatures were carried out and the characteristics of gas products with temperature and aging time, the physical and chemical properties of EP surface and the electrical characteristics of C₃F₇CN/EP insulation system were obtained. The results showed that the main decomposition products are CF₄, CHF₃, CF₃CN, C₃H₃F₃, C₃F₆, C₂N₂, C₂H₆, C₂F₄ and C₃F₈. The breakdown voltage of the C₃F₇CN/CO₂ gas mixtures after 10 hours of partial overheating at 625℃ decreases by 20.38%. The EP doesn’ t decompose at 105℃, begin to decompose at 279°C, EP is completely destroyed at 400℃ and 625℃, the C-C, C=C, and C-O bonds of the EP surface has broken. The flashover voltage of the EP at 279°C drops by about 6.4% compared to the unaged sample. The relative dielectric strength of gas decomposition products after partial overheating is slightly worse than that of C₃F₇CN. The degradation mechanism of C₃F₇CN/EP was analyzed based on the density functional theory (DFT), the C chain on the surface of EP breaks on the action of partial high temperature, the band gap decreases, the conductivity increases and the flashover voltage drops. It is proposed that C₃H₃F₃ gas is a marker product for diagnosing partial overheating decomposition of C₃F₇CN/EP insulation system.

Key words： C₃F₇CN/CO₂gas mixtures partial overheating gas-solid insulation epoxy resin insulation deterioration

Received: 31 December 2020

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TM855

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	Cao Renjie
	Wang Cong
	Tu Youping
	Zhang Ying
	Ai Xin

Cite this article:

Cao Renjie,Wang Cong,Tu Youping等. Degradation Characteristics of C₃F₇CN/Epoxy Resin on Partial Overheating[J]. Transactions of China Electrotechnical Society, 2021, 36(15): 3172-3181.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201724 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I15/3172

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