$\text{C}_{{5}}\text{F}_{{10}}\text{O}$ gas mixture is one of the most promising SF6 replacement gases with outstanding electrical performance and excellent environmental characteristics. Its switching impulse (SI) breakdown characteristics are important for future insulation design and insulation coordination. In this article, factors that can influence SI withstand voltage and the synergy of the gas mixture such as gas pressure, and the type and content of the buffer gas, are experimentally studied. According to the experimental results, $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ gas mixtures under nonuniform electric field show significant polarity effects under SI voltage. When the polarity of the applied voltage is negative, its $U_{\mathrm {50\%}}$ tends to increase linearly with the increase in gas pressure, while the “hump phenomenon” is observed under positive SIs as the gas pressure increases, which can be explained by the enhanced electric field distortion by the space charge. The insulation strength of the two gas mixtures increases more obviously with the increase in $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ content at lower mixing ratios and shows a saturation trend at higher mixing ratios. Based on the calculation, CO2 in discharge processes is likely to produce more low-energy electrons than that can be produced by N2 under the same conditions, so that SI withstand voltage of $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ /CO2 is higher than that of $\text{C}_{{5}}\text{F}_{{10}}\text{O} / \text{N}_{2}$ according to the attachment of low-energy electrons by $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ . On this basis, the synergistic effects between different gas components are calculated. The synergy between the components of a gas mixture is related to the gas pressure and $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ content, and the synergistic effects are more significant in $\text{C}_{{5}}\text{F}_{{10}}\text{O} / \text{N}_{{2}}$ mixture than in $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ /CO2 mixture. The results show that SI withstand voltage of $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ gas mixtures under a nonuniform electric field can be improved by increasing the gas pressure or $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ content. $\text{C}_{{5}}\text{F}_{{10}}\text{O}$ gas mixture has the potential to replace SF6 in certain mixing ratio and under certain gas pressure.

中文翻译：

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极不均匀场下C5F10O气体混合物的开关脉冲特性


$\text{C}_{{5}}\text{F}_{{10}}\text{O}$混合气体是最有前途的SF6替代气体之一，具有出色的电气性能和优异的环境特性。其开关脉冲（SI）击穿特性对于未来的绝缘设计和绝缘协调非常重要。本文对气体压力、缓冲气体的种类和含量等影响SI耐压和混合气体协同作用的因素进行了实验研究。实验结果表明，非均匀电场下的$\text{C}_{{5}}\text{F}_{{10}}\text{O}$气体混合物在SI电压下表现出明显的极性效应。当施加电压的极性为负时，其$U_{\mathrm {50\%}}$随着气压的增加而趋于线性增加，而在正SI下，随着气压的增加，观察到“驼峰现象” ，这可以通过空间电荷增强电场畸变来解释。在较低混合比和在较高混合比下显示出饱和趋势。根据计算，同等条件下CO2在放电过程中很可能比N2产生更多的低能电子，因此SI的耐压为$\text{C}_{{5}}\text {F}_{{10}}\text{O}$ /CO2 高于 $\text{C}_{{5}}\text{F}_{{10}}\text{O} / \text{N}_{2}$根据$\text{C}_{{5}}\text{F}_{{10}}\text{O}$对低能电子的附着。在此基础上，计算不同气体成分之间的协同效应。 气体混合物各组分之间的协同作用与气体压力和$\text{C}_{{5}}\text{F}_{{10}}\text{O}$含量有关，协同作用$\text{C}_{{5}}\text{F}_{{10}}\text{O} / \text{N}_{{2}}$ 混合物中的影响比 $ 中更显着\text{C}_{{5}}\text{F}_{{10}}\text{O}$ /CO2 混合物。结果表明，$\text{C}_{{5}}\text{F}_{{10}}\text{O}$气体混合物在非均匀电场下的SI耐压可以通过提高气压或$\text{C}_{{5}}\text{F}_{{10}}\text{O}$内容。 $\text{C}_{{5}}\text{F}_{{10}}\text{O}$混合气体在一定的混合比例和一定的气体压力下具有替代SF6的潜力。