环保型全氟己酮混合绝缘气体与设备内部关键材料在放电和过热条件下相容性研究

SF6绝缘气体具有强温室效应，导致其长期使用受到制约，全氟己酮（C6F12O）以其优良的环保、绝缘、安全性能，极具替代SF6应用于气体绝缘开关柜（C-GIS）等设备的潜力。但对C6F12O混合绝缘气体与设备内部的金属、绝缘、密封和吸附剂等关键材料在放电或过热条件下的相容性还不完全清楚。本项目基于密度泛函理论建立考虑范德华作用的多粒子参与气-固材料三维量子化学模型，揭示微观理化过程对气-固材料稳定性和功能性的影响机理，实验探究不同温度和放电强度下金属、绝缘和密封材料对C6F12O混合气体分解特性的作用机制，厘清固体材料表面形态、力学性能、介电特性、微观结构和元素组成变化规律，测试潜在吸附剂对有害气体副产物和H2O等杂质的吸附效果及使用寿命，掌握吸附剂和其它固体材料间协同作用行为，提出适合新型环保C-GIS内部使用的最佳材料组合方案，为该类设备的设计制造、推广应用和安全维护提供理论与技术支撑。

Strong greenhouse effect of SF6 restricts its long-term usage in cubicle type gas insulated switchgear (C-GIS) equipment. Perfluorohexanone (C6F12O) is a substitute of SF6 with great potential as it has minimum environmental impact, good insulation capacity and high safety. However, it is still unclear under discharge and overheat conditions, on the compatibility between C6F12O gas mixture and key materials, such as metal, solid insulation, seal and adsorbent in equipment. This project will establish gas-solid three-dimensional quantum-chemical model with multiple particles considering the Van der Waals interaction based on the density functional theory to reveal the influence mechanism of microscopic physicochemical process on the stability and functionality of gas-solid materials. The action mechanism of metal, solid insulation and seal on the decomposition characteristics of C6F12O gas mixture will also be tested under different temperature and discharge intensity conditions. The change rule of the surface morphology, mechanical properties, dielectric behavior, microstructure and element composition of solid materials will be clarified. The absorption efficacy of potential adsorbents to harmful gas by-products and H2O and their service life will also be tested to investigate the synergistic effect between the adsorbent and the other key materials. The best material combination scheme for the internal use of eco-friendly C-GIS will finally be proposed. This project could provide theoretical and technical support for the design, manufacture, promotion and maintenance of C6F12O gas mixture based electrical equipment.