Influence of humidity on the decomposition products and insulating characteristics of CF3I
Influence of humidity on the decomposition products and insulating characteristics of CF3I
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DOI：
10.1109/tdei.2015.005456
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发表时间：
2016-05
影响因子：
3.1
通讯作者：
Xiaoxing Zhang;S. Xiao;Jian Zhang;Chengqi Li;Qiwei Dai;Y. Han
中科院分区：
文献类型：
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作者：
Xiaoxing Zhang;S. Xiao;Jian Zhang;Chengqi Li;Qiwei Dai;Y. Han
最近的研究表明CF3I有可能取代SF6用于气体绝缘开关设备（GIS）作为绝缘气体。 H2O是影响放电中SF6分解产物种类和数量的关键因素之一。 CF3I的分解过程以及H2O对CF3I绝缘性能的影响尚未研究。本文利用密度泛函理论（DFT）模拟分析了微湿CF3I在常温常压下的分解过程。根据热力学理论计算和比较反应能量的变化，找到最可能的反应途径和分解产物。结果表明，CF3I在强电场中附着电子后会发生击穿，且击穿是可逆的。 CF3I能与高能电子碰撞H2O产生的H-和OH-反应，生成各种复杂的产物，打破了CF3I的动态平衡。局部放电实验结果表明，当微水分含量增加时，CF3I中的放电变得更加剧烈。模拟和实验结果验证了H2O会破坏CF3I的绝缘性能。
Recent studies show that CF3I is possible to take the place of SF6 used in gas insulated switchgear (GIS) as insulating gas. H2O is one of the key factors influencing the categories and quantities of decomposition products of SF6 in discharge. The process of decomposition of CF3I and the influence from H2O on the insulating property of CF3I have not been studied. In this paper, we analyzed the process of decomposition of CF3I with micro-moisture at ambient temperature and pressure using simulation by density functional theory (DFT). The changes in energy of reactions were calculated and compared according to thermodynamic theories and the most likely reaction pathways and decomposition products were found. The results show that CF3I may break down after attaching electron in strong electric field, which is reversible. CF3I can react with H- and OH-coming from H2O collided by high-energy electron and produce various and complex products, which breaks the dynamic balance of CF3I. Partial discharge experimental results show that the discharge in CF3I becomes more violent when the micro-moisture content increases. The result of simulation and experiment verifies H2O can destroy the insulating property of CF3I.