高电压技术2018，Vol.44Issue(5)：1520-1527,8.DOI:10.13336/j.1003-6520.hve.20180430017
气压对SF6局部过热分解的影响特性
Influence Characteristics of Pressure on the Partial Over-thermal Decomposition of SF6
摘要
Abstract
In order to obtain the influence characteristics of gas pressure on the partial over-thermal decomposition of SF6, we researched the decomposition characteristics of SF6 under partial over-thermal fault based on the statistics from lab experiments and further analysis. The gas pressure value settings of the experiments were selected within the range between 0.2 MPa and 0.5 MPa. The simulated fault temperature of heating source was set to be 400 degrees Celsius. With the help of particle collision theory, we analyzed the impact mechanisms of gas pressure on the generation process of SF6 decomposition characteristic components. The experimental results show that, as the pressure increases, the effective collision frequency of various molecules within unit volume increases correspondingly. And the aforementioned process further promotes the generation rate of the components of CO2, SO2F2, SOF2, H2S, and SO2, respectively. As a consequence, the concentrations of each decomposed component increase along with the rise of gas pressures. A conclusion can be drawn from our experimental results that the gas pressure has varying levels of promoting effects on different decomposition components. Specifically, the promotion level on the formation of SO2F2 is most remarkable among all decomposed components. Moreover, it is found that there are significant patterns of the influence of pressure on the effective formation rate of characteristic components. Meanwhile, we have also discovered a close linear relation between both effective ratios of characteristic components, SO2F2/SOF2 and SO2F2/(SOF2+SO2), with respect to the gas pressure inside the insulating device. The above results can provide theoretical support for SF6 decomposition component analysis (DCA) to monitor the insulation status of SF6 gas insulation equipment in the future.关键词
SF6/局部过热性故障/气压/碰撞理论/摩尔浓度Key words
SF6/partial over-thermal fault/gas pressure/collision theory/molar concentration引用本文复制引用
唐炬,赵天成,姚强,苗玉龙,曾福平..气压对SF6局部过热分解的影响特性[J].高电压技术,2018,44(5):1520-1527,8.基金项目
国家重点研发计划(2017YFB0902705)；国家自然科学基金(51607127 （2017YFB0902705）
51537009) （）
湖北省自然科学基金创新群体项目 (2016CFA007)。Project supported by National Key Research and Delevopment Program of China (2017YFB0902705), National Natural Science Foundation of China (51607127, 51537009), Natural Science Foundation Innovative Group Project of Hubei Province(2016CFA007). （2016CFA007）
