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由于O2直接参与SF6过热分解组分的生成过程，而目前有关其作用机制与宏观规律尚不完全清楚，因此亟需了解微量O2对SF6过热分解特性的影响规律，为建立有效的SF6气体绝缘装备过热故障诊断方法提供参考。该文在已有的 SF6过热分解模拟实验系统上，对不同比例的 SF6/O2混合气体进行大量的过热分解实验，获取微量O2对SF6过热分解组分的有效产气速率和特征比值的影响规律，进而研究微量O2对分解组分形成过程的影响机制。结果表明：微量O2对SF6的主要过热分解组分H2S、CO2、SO2F2、SOF2和SO2的有效产气速率均有一定的影响，但影响规律因组分的差异而不同，致使表征局部过热性故障属性的特征分解组分比值因O2含量的不同而发生变化，但二者有较为明显的关联关系。“,”As the result of the direct involvement that trace O2 participates in SF6decomposition process under partial overthermal fault, but the corresponding mechanisms and macro-rules are of blank. Hence, it is essential to investigate the influence of trace O2on SF6 overthermal decomposition characteristics and establish the foundation for the effective partial overthermal fault diagnosis method of SF6 gas insulated apparatus. Therefore, a series of overthermal decomposition experiments of different SF6/O2 mixture on the existing simulation system were conducted. Influence rules of trace O2 on effective formation rates and characteristic ratio of decomposition components were achieved. The impact mechanism of trace O2on the formation process of SF6 overthermal decomposition components was analyzed based on the data acquired. The results show that: trace O2has impact on the effective formation rates of SF6 overthermal decomposition components to some extent, such as H2S, CO2, SO2F2, SOF2 as well as SO2. The influence rule of each component is different from others.