Recently, finding a new environmentally insulating medium which can replace SF₆ has become a research hotspot in the power industry field in recent years. Current research shows that C₆F₁₂O has good environmental performance and dielectric strength. In order to further explore the potential of C₆F₁₂O/CO₂ mixed gas used in medium and low-voltage level electrical equipment, this paper has explored its decomposition characteristics through theoretical calculations and power frequency breakdown tests. First, the formation process of C₆F₁₂O decomposition products is calculated by using density functional theory. Then, the decomposition products of C₆F₁₂O/CO₂ gas mixture with 6% C₆F₁₂O was detected by GC-MS after 50 times power frequency breakdown tests. Theoretical calculations show that the C–C bond and C–F bond in the C₆F₁₂O molecule are broken to form free radicals CF₃•, C₂F₅•, C₃F₇• and F atoms, and then they further combine to form fluorocarbon compounds CF₄, C₂F₆, C₃F₈, C₃F₆ and C₅F₁₂. Among them, the reactions of forming CF₄, C₂F₆ and C₃F₈ are easier to occur. In the temperature range of 0–1000 K, with the temperature rising, the energy of the main decomposition products does not change much. At the same time, the experimental results show that the breakdown voltage of C₆F₁₂O/CO₂ mixed gas with 6% C₆F₁₂O is about 1.5 times that of pure CO₂ under 0.14 MPa. The components and content of the decomposition products are consistent with the theoretical calculation results. The above conclusions can provide theoretical basis and engineering guidance for the application of C₆F₁₂O/CO₂ mixed gas.

近年来，寻找可替代SF ₆的新型环境绝缘介质已成为近年来电力工业领域的研究热点。当前的研究表明，C ₆ F ₁₂ O具有良好的环境性能和介电强度。为了进一步探索中低压电气设备中使用的C ₆ F ₁₂ O / CO ₂混合气体的潜力，本文通过理论计算和工频击穿试验研究了其分解特性。一，C ₆ F ₁₂的形成过程利用密度泛函理论计算O分解产物。然后，在经过50次工频击穿试验后，通过GC-MS检测了C ₆ F ₁₂ O / CO ₂气体混合物与6％C ₆ F ₁₂ O的分解产物。理论计算表明，C ₆ F ₁₂ O分子中的C–C键和C–F键断裂形成自由基CF ₃ •，C ₂ F ₅ •，C ₃ F ₇ •和F原子，然后它们进一步结合形成碳氟化合物CF ₄，C ₂ F ₆，C ₃F ₈，C ₃ F ₆和C ₅ F ₁₂。其中，形成CF ₄，C ₂ F ₆和C ₃ F ₈的反应更容易发生。在0-1000 K的温度范围内，随着温度的升高，主要分解产物的能量变化不大。同时，实验结果表明，含6％C ₆ F ₁₂ O的C ₆ F ₁₂ O / CO ₂混合气体的击穿电压约为纯CO _2的1.5倍低于0.14 MPa。分解产物的组成和含量与理论计算结果一致。以上结论可为C ₆ F ₁₂ O / CO ₂混合气的应用提供理论依据和工程指导。