电晕放电下C5F10O混合气体的分解特性

doi:10.19595/j.cnki.1000-6753.tces.191788

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摘要

C₅F₁₀O的绝缘强度高且全球变暖潜能值低,是一种潜在的SF₆替代气体,但其分解特性的研究尚少。该文首先基于密度泛函理论对C₅F₁₀O的分解路径进行计算,结果表明,C₅F₁₀O初步裂解可形成CF₃-、F-、C₃F₇-等自由基,这些自由基经复合或分解反应可最终生成CF₄、C₂F₆、C₃F₈等氟碳类化合物。随后进行C₅F₁₀O/空气与C₅F₁₀O/N₂混合气体的工频电晕放电实验,采用气相色谱质谱联用技术对分解产物进行定性和定量检测,并分析分解产物的体积分数变化与气体混合比和施加电压之间的关系。实验结果表明：两种混合气体的分解物主要成分为CO、CO₂、CF₄、C₂F₆、C₃F₈、C₂F₄和C₃F₆;氟碳类气体总体积分数、CO体积分数及CO₂体积分数均与C₅F₁₀O混合比例、施加电压正相关。从应用条件和减少分解产物种类与毒性角度考虑,比例为93.5%~96%的空气适合用作C₅F₁₀O的缓冲气体。

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关键词 ： C₅F₁₀O, 电晕放电, 分解特性, 缓冲气体, 密度泛函理论

Abstract：

C₅F₁₀O, a potential SF₆ alternative gas, has high dielectric strength and low GWP. However, there are few studies on the decomposition characteristics of C₅F₁₀O. Based on density functional theory, the decomposition pathways of C₅F₁₀O were analyzed. The calculation shows that the formation of fluorocarbon decomposition products is related to the recombination or decomposition reaction of CF₃、F、C₃F₇ and other radicals. Furthermore, a series of AC corona discharge experiments on C₅F₁₀O/air and C₅F₁₀O/N₂ mixed gases were carried out, and GC-MS was used to detect the decomposition products. The concentration variation of fluorocarbon gas, carbon-oxygen gas and nitrile gas with the gas mixing ratio and the applied voltage was investigated. The results show that the main by-products of the two mixed gases are CO, CO₂, CF₄, C₂F₆, C₃F₈, C₂F₄and C₃F₆. The total content of fluorocarbon gases, the content of CO and the content of CO₂ are positively related to the mixing ratio of C₅F₁₀O and the applied voltage. From the perspective of application conditions and reduction of the types and toxicity of decomposition products, air with a ratio of 93.5%~96% is more suitable as a buffer gas for C₅F₁₀O.

Key words： C₅F₁₀O corona discharge decomposition characteristic buffer gas density functional theory

收稿日期: 2019-12-19

PACS:

TM85

基金资助:

国家自然科学基金项目（51877203）、国家重点研发计划项目（2017TFB0902500）和国家电网公司总部科技项目（环保型管道输电关键技术）资助

通讯作者: 韩冬女,1975年生,博士,副研究员,研究方向为SF₆替代技术、电力设备故障检测等。E-mail: donghan@mail.iee.ac.cn

作者简介: 周朕蕊女,1995年生,硕士研究生,研究方向为SF6替代技术、电力设备故障检测等。E-mail: zhouzhenrui@mail.iee.ac.cn

引用本文:

周朕蕊, 韩冬, 赵明月, 张国强. 电晕放电下C₅F₁₀O混合气体的分解特性[J]. 电工技术学报, 2021, 36(2): 407-416. Zhou Zhenrui, Han Dong, Zhao Mingyue, Zhang Guoqiang. Decomposition Characteristics of C₅F₁₀O Mixtures under Corona Discharge. Transactions of China Electrotechnical Society, 2021, 36(2): 407-416.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.191788 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I2/407

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