CF3COCF(CF3)2(即C5-PFK)是一种基本电气参数已被全面揭示的环保型绝缘气体，具有在环网开关柜等设备上替代SF6的应用潜力。为进一步掌握C5-PFK气体在早期绝缘故障下的稳定性和复原性及相容性，本课题拟开展局部过热和局部放电下C5-PFK的分解与复原特性和C5-PFK及其分解产物与设备内部材料的相容性研究。通过建立的绝缘气体故障分解实验系统，获取大量特性数据，探索缓冲气体类型、含量、气压、微水和微氧等因素对C5-PFK绝缘稳定性的影响规律，解析C5-PFK及其分解产物与设备内部材料的相容问题；结合分子动力学分析、多物理场耦合仿真和同位素示踪技术，从分子结构与键能的微观层面，揭示C5-PFK在局部过热和局部强电磁能下的分解与复原机理以及影响因素的协同作用机制，获取绝缘故障下C5-PFK气体的稳定性和复原性与绝缘性能之间的动态关系，为C5-PFK气体的工程应用提供理论支撑。

CF3COCF(CF3)2 (C5-PFK) is an environmentally friendly insulating medium whose basic electrical parameters have been fully revealed. Its gas mixture has the potential to replace SF6 using in electrical equipment such as ring-network cabinet. In order to further understand the stability, self-recovery and compatibility of C5-PFK under insulation faults, this study intends to investigate the decomposition and self-recovery characteristics of C5-PFK under partial overheating and partial discharge conditions, as well as compatibility between C5-PFK and its decomposition products with equipment materials. A large amount of characteristic data will be obtained based on the established gas fault decomposition experimental platform. The influence of buffer gas type, mixing ratio, pressure, trace-water and trace-oxygen on the insulation stability of C5-PFK and the compatibility between C5-PFK and its decomposition products with equipment materials will be explored. Combined with molecular dynamics method, multiphysics coupled simulation and isotope tracing technique, the decomposition and self-recovery mechanism of C5-PFK under local high-temperature thermodynamic equilibrium and local strong electromagnetic energy conditions, as well as the synergistic mechanism of different influencing factors will be revealed from the microscopic level of molecular structure and bond energy. The dynamic relationship between the stability, self-recovery with the insulation performance of C5-PFK under insulation faults conditions will be explored, which provides theoretical support for the engineering application of C5-PFK gas mixture.