By-products of CF3I/N2 Gas Mixtures Under DC Voltage Discharge

被引：0
|
作者：
Wang C. [1 ]
Zhou F. [1 ]
Tu Y. [1 ]
Qin S. [1 ]
Zhang B. [1 ]
机构：
[1] Key Laboratory of High Voltage & EMC, North China Electric Power University, Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2017年 / 37卷 / 04期
关键词：
CF[!sub]3[!/sub]I/N[!sub]2[!/sub] gas mixtures; Density functional theory (DFT); Free energy; Gas chromatography and mass spectrometry (GC-MS); Ion chromatography;
D O I：
10.13334/j.0258-8013.pcsee.161827
中图分类号：
学科分类号：
摘要：
CF3I/N2 gas mixtures are expected to replace SF6 gas and applied in gas insulated equipment. To study the by-products of CF3I/N2 gas mixtures after discharging, molecules structure models of CF3I and its potential by-products were established by applying the BFGS algorithm based on density functional theory (DFT). And the molecular total energy of the ground state was calculated by GGA-PBE algorithm, the reaction free energy of by-products molecules was obtained. The results show that the by-products may contain C2F6, C2F5I and I2. Gases and solids that produced from DC voltage discharging in CF3I/N2 gas mixtures were analyzed by GC-MS and ion chromatography. The results show that the main composition of gas by-product was C2F5I after gas discharging, and solid by-product was I2. At the same time, after gas discharging, a small amount of solid I elemental would produce, resulting in reduced CF3I gas content. But after a relatively long time, CF3I/N2 gas insulation could be restored to the level before discharge. This suggested that CF3I/N2 gas insulation performance mainly depends on free radicals on electronic adsorption, rather than the electronegativity of I. In this paper, the research results show that, by-products which can be detected after CF3I/N2 gas discharging under DC voltage applying, are C2F5I and I2. © 2017 Chin. Soc. for Elec. Eng.
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页码：1268 / 1274
页数：6
相关论文
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