Thermal equilibrium composition of C4F7N/CO2 gas mixtures during arc-interruption

被引：0
|
作者：
Gao, Wenqiang [1 ]
Shiravand, Vahid [1 ]
Posada, Luisa F. [2 ]
Shubhashish, Shubhashish [2 ]
Suib, Steven L. [2 ]
Cao, Yang [1 ]
机构：
[1] Univ Connecticut, Dept Elect & Comp Engn, Storrs, CT 06269 USA
[2] Univ Connecticut, Dept Chem, Storrs, CT 06269 USA
来源：
2023 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA, CEIDP | 2023年
基金：
美国能源部;
关键词：
C4F7N; SF6; replacement; decomposition; thermal equilibrium; Gibbs free energy;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
C4F7N/CO2 gas mixtures have been proposed as an eco-friendly insulator with a low global warming potential to replace SF6 in the power grid. However, recent studies revealed that these gas mixtures may decompose in complicated pathways, raising concerns about their scaling-up adoption. In this work, we performed computations aimed at probing the thermal equilibrium composition of C4F7N/CO2 gas mixtures during arc-interruption based on density functional theory (DFT) and Gibbs free energy minimization. The computations demonstrated that C4F7N stays stable until 1000 K. Above 1000 K, C4F7N rapidly decomposes into CF3, CN, and F free radicals, and the C free radicals released from C4F7N recombine with the O free radicals released from CO2 to generate CO. Above 10000 K, CO starts to decompose into C free radicals and O free radicals. Above 20000 K, all molecules and free radicals fully decompose into monatomic free radicals, including C, F, N, and O. The computations aid the future mitigation of C4F7N/CO2 decomposition products and promote the adoption of C4F7N/CO2 gas mixtures in an SF6-free green power network.
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页数：3
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