微水对环保型绝缘介质C5F10O分解的影响

Influence of Trace Water on Decomposition of Environmental Insulating Medium C5F10O

C5F10O作为潜在的SF6替代气体近年来得到了广泛关注,目前针对其分解特性的研究较少。文中采用密度泛函理论分析了微量水分对C5F10O分解特性的影响情况。首先计算了微水环境下C5F10O可能的分解路径及焓值,其次讨论了分解产物的电离参数。研究发现水分子解离产生的H和OH与C5F10O分解产生的C3F7、CF3等自由基反应会产生C3F7COH、C3F7OH、CF3COH、C3F7、CF3OH、CF2O等物质,上述分解产物的电离参数较弱,且CF2O和HF属于有毒物质。微水的存在将促进C5F10O的分解,进而影响C5F10O混合气体的绝缘性能。相关研究成果为后期深入探究C5F10O混合气体的绝缘特性试验方法尤其是微水含量值制定提供了依据。

C5 F10O,as a potential alternative gas for SF6,has attracted much attention in recent years.And there are few researches on the decomposition characteristics of C5 F10O.In this paper,density functional theory(DFT)was used to analyze the influence of trace water on the decomposition properties of C5 F10O.Firstly,the possible decomposition paths and enthalpy of C5 F10O under trace water condition were calculated.Secondly,the ionization parameters of the decomposition products are discussed.We found that H and OH dissociated from H2 O molecules and the free radicals such as C3 F7,CF3 produced by C5 F10O can react producing C3 F7 COH、C3 F7 OH、CF3 COH、C3 F7、CF3 OH and CF2 O etc.The ionization parameters of the above decomposition products are weak,and CF2 O and HF belong to toxic substances.The presence of trace water will promote the decomposition of C5 F10O,and thus affect the insulation performance of C5 F10O gas mixture.The related research results provide the basis for the further exploration of the test methods for the insulation characteristics of C5 F10O gas mixture,especially for the trace water content.