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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摘要 C₃F₇CN/CO₂混合气体被认为是当前最具潜力的SF₆替代气体。研究局部过热缺陷下环保型气固绝缘系统的劣化特性,可以为环保型气体绝缘电气设备的运维提供参考。该文搭建了局部过热模拟试验平台,开展C₃F₇CN/EP在不同温度下的劣化试验,获得气体分解产物随温度和时长的变化特性、EP表面物化特性和C₃F₇CN/EP气固绝缘系统劣化后的电气特性。结果表明：局部过热分解产物主要有CF₄、CHF₃、CF₃CN、C₃H₃F₃、C₃F₆、C₂N₂、C₂H₆、C₂F₄、C₃F₈,625℃下局部过热10h后混合气体的击穿电压下降了20.38%;环氧树脂在105℃时不分解,279℃时开始分解,400℃和625℃时完全被破坏,环氧树脂表面发生了C-C、C=C、C-O键的断裂;相比未老化试样,279℃时环氧树脂试样的冲击闪络电压下降了约6.4%;局部过热后主要气体分解产物的相对绝缘强度比C₃F₇CN略差;基于密度泛函理论（DFT）分析了C₃F₇CN/EP劣化机理,EP表面的C链在局部高温的作用下断裂,带隙减小,电导率增大,闪络电压下降;提出C₃H₃F₃气体可作为诊断C₃F₇CN/EP绝缘系统过热分解的特征产物。

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关键词 ： C₃F₇CN/CO₂混合气体, 局部过热, 气固绝缘, 环氧树脂, 绝缘劣化

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

收稿日期: 2020-12-31

PACS:

TM855

基金资助:北京市自然科学基金资助项目（3192038）

通讯作者: 王璁男,1980年生,博士,高级工程师,研究方向为电气设备外绝缘与气体放电。E-mail：cong@ncepu.edu.cn

作者简介: 曹人杰男,1996年生,硕士研究生,研究方向为电气设备外绝缘与气体放电。E-mail：18638652521@163.com

引用本文:

曹人杰, 王璁, 屠幼萍, 张颖, 艾昕. 局部过热下C₃F₇CN/EP气固绝缘系统劣化特性[J]. 电工技术学报, 2021, 36(15): 3172-3181. Cao Renjie, Wang Cong, Tu Youping, Zhang Ying, Ai Xin. Degradation Characteristics of C₃F₇CN/Epoxy Resin on Partial Overheating. Transactions of China Electrotechnical Society, 2021, 36(15): 3172-3181.

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