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。
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,C2F4 and 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.
作者
周朕蕊
韩冬
赵明月
张国强
Zhou Zhenrui;Han Dong;Zhao Mingyue;Zhang Guoqiang(Institute of Electrical Engineering Chinese Academy of Sciences,Beijing 100190 China;University of Chinese Academy of Sciences,Beijing 100049 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第2期407-416,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51877203)
国家重点研发计划项目(2017TFB0902500)
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。
关键词
C5F10O
电晕放电
分解特性
缓冲气体
密度泛函理论
C5F10O
corona discharge
decomposition characteristic
buffer gas
density functional theory
