C4F7N is one of the most promising candidate to replace SF6 as arc quenching medium. Some buffer gases (N2 and CO2) are usually mixed with C4F7N to reduce the operating temperature. In order to provide priori knowledge of the arc quenching performance for C4F7N mixtures, the plasma properties including equilibrium compositions, thermodynamic properties, transport coefficients, and net emission coefficients of C4F7N–N2 and C4F7N–CO2 arc plasmas are calculated and the effects of buffer gases are discussed. Taking these properties as input, a 1D arc decaying model is constructed to describe arc decaying characteristics. According to the evolution of axial temperature and arc conductance over time, the arc decaying process is divided into three stages, i.e. the thermal recovery stage, the pre-dielectric recovery stage, and the post-dielectric recovery stage. We focus on the first two stages and describe them by the thermal recovery time (or rate) and the pre-dielectric recovery time (or rate) respectively. According to the results of 1D arc decaying modelling, the descending order of the thermal recovery ability for the gases studied in this work is: SF6 > C4F7N > 75%C4F7N–25%N2 > 75%C4F7N–25%CO2 > 50%C4F7N–50%N2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > CO2 > 25%C4F7N–75%CO2 > N2; and the pre-dielectric recovery ability is: N2 > SF6 > CO2 > 25%C4F7N–75%CO2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > 75%C4F7N–25%CO2 > 50%C4F7N–50%N2 > 75%C4F7N–25%N2 > C4F7N.

中文翻译：

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缓冲气体对 C4F7N–N2 和 C4F7N–CO2 电弧等离子体的等离子体性质和电弧衰减特性的影响

C4F7N 是最有希望替代 SF6 作为灭弧介质的候选者之一。一些缓冲气体（N2 和 CO2）通常与 C4F7N 混合以降低操作温度。为了提供 C4F7N 混合物灭弧性能的先验知识，计算了等离子体特性，包括 C4F7N-N2 和 C4F7N-CO2 电弧等离子体的平衡成分、热力学特性、传输系数和净发射系数，并计算了缓冲气体的影响进行了讨论。以这些属性为输入，构建一维电弧衰减模型来描述电弧衰减特性。根据轴向温度和电弧电导随时间的演变，电弧衰减过程分为三个阶段，即热恢复阶段、预介电恢复阶段、和后介电恢复阶段。我们关注前两个阶段，并分别用热恢复时间（或速率）和预介电恢复时间（或速率）来描述它们。根据一维电弧衰减建模结果，本文研究气体的热回收能力降序为：SF6 > C4F7N > 75%C4F7N–25%N2 > 75%C4F7N–25%CO2 > 50%C4F7N –50%N2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > CO2 > 25%C4F7N–75%CO2 > N2；预介电恢复能力为： N2 > SF6 > CO2 > 25%C4F7N–75%CO2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > 75%C4F7N–25%CO2 > 50%C4F7N –50%N2 > 75%C4F7N–25%N2 > C4F7N。根据一维电弧衰减建模结果，本文研究气体的热回收能力降序为：SF6 > C4F7N > 75%C4F7N–25%N2 > 75%C4F7N–25%CO2 > 50%C4F7N –50%N2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > CO2 > 25%C4F7N–75%CO2 > N2；预介电恢复能力为： N2 > SF6 > CO2 > 25%C4F7N–75%CO2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > 75%C4F7N–25%CO2 > 50%C4F7N –50%N2 > 75%C4F7N–25%N2 > C4F7N。根据一维电弧衰减建模结果，本文研究气体的热回收能力降序为：SF6 > C4F7N > 75%C4F7N–25%N2 > 75%C4F7N–25%CO2 > 50%C4F7N –50%N2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > CO2 > 25%C4F7N–75%CO2 > N2；预介电恢复能力为： N2 > SF6 > CO2 > 25%C4F7N–75%CO2 > 25%C4F7N–75%N2 > 50%C4F7N–50%CO2 > 75%C4F7N–25%CO2 > 50%C4F7N –50%N2 > 75%C4F7N–25%N2 > C4F7N。