In this work, we explored the ac breakdown characteristics of C₅F₁₀O/CO₂ mixtures under different electrode surface roughness. It was found that sulphur hexafluoride (SF₆) outperforms C₅F₁₀O/CO₂ mixtures in the ac breakdown experiments. The breakdown voltages of C₅F₁₀O/CO₂ and SF₆ are negatively correlated with the surface roughness, while SF₆ is more sensitive to the electrode surface roughness than C₅F₁₀O/CO₂. To reach the dielectric strength of SF₆, an increase in pressure or mixing ratio of C₅F₁₀O/CO₂ is needed, while the liquefaction temperature of C₅F₁₀O/CO₂ will increase simultaneously. Considering the limitation of 20% drop in dielectric strength, the maximum acceptable surface roughness of the gases is determined. The controlling requirement of electrode surface roughness ${R}_{t}$ of 30 $\mu \text{m}$ in SF₆ equipment is suitable for the design of C₅F₁₀O/CO₂ equipment.

中文翻译：

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不同电极表面粗糙度下C₅F₁₀O/CO₂气体的交流击穿特性

在这项工作中，我们探索了C ₅ F ₁₀ O/CO ₂混合物在不同电极表面粗糙度下的交流击穿特性。发现在交流击穿实验中，六氟化硫 (SF ₆ ) 的性能优于 C ₅ F ₁₀ O/CO ₂混合物。_{C 5} F ₁₀ O/CO ₂和SF ₆的击穿电压与表面粗糙度呈负相关，而SF ₆对电极表面粗糙度的敏感性高于C ₅ F ₁₀ O/CO ₂。达到SF的介电强度_{如图6所示}，需要增加C 5 F 10 O/CO 2 的压力或混合比，同时C ₅ F ₁₀ O/CO _2的液化_温度也会_随之升高。考虑到介电强度下降 20% 的限制，确定了气体的最大可接受表面粗糙度。电极表面粗糙度的控制要求 ${R}_{t}$30 个 $\mu \text{m}$in SF ₆设备适用于C ₅ F ₁₀ O/CO ₂设备的设计。