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Mechanism of Trace O2 on SF6 Characteristic Decomposed Components Under Spark Discharge
Plasma Chemistry and Plasma Processing ( IF 3.6 ) Pub Date : 2020-01-17 , DOI: 10.1007/s11090-019-10041-6
Xiajin Rao , Ju Tang , Fuping Zeng , Dajian Li , Xiaofei Xia , Yi Su , Yufeng Lu

Trace O2 significantly affects the diagnosis accuracy of decomposed components analysis method for spark discharge due to its direct participation in SF6 decomposition process. Therefore, spark discharge decomposition experiments were conducted under different proportions of SF6/O2 mixtures. The influence rules and mechanisms of φ(O2) on the content and characteristic ratio of SF6 spark discharge decomposed components were analysed quantitatively. Meanwhile, the materials on the electrode surface after spark discharge were conducted XPS analysis. Results show: no matter how much O2 adds, there exist SOF2, SOF4, SO2, and SO2F2 in the process of SF6 decomposition. The increase of φ(O2) plays a positive role in the production of SOF4 and SO2F2, but has the adverse effect on SO2. The content of SOF2 barely changes with φ(O2) increasing. Characteristic ratio φ(SO2F2 + SOF4)/φ(SOF2) gradually grows with φ(O2), but change little with discharge time extended. The X-ray photoelectron spectra show that the solid materials on the surface of the plate electrode after discharge contain Al2O3 and AlF3, and S mainly exists as metal sulfides.

中文翻译:

火花放电下SF6特征分解组分微量O2的作用机理

微量O2直接参与SF6分解过程,显着影响火花放电分解成分分析方法的诊断精度。因此,在不同比例的SF6/O2混合物下进行了火花放电分解实验。定量分析了φ(O2)对SF6火花放电分解成分含量和特征比的影响规律和机制。同时对火花放电后电极表面的材料进行XPS分析。结果表明:无论加入多少O2,SF6分解过程中都存在SOF2、SOF4、SO2、SO2F2。φ(O2)的增加对SOF4和SO2F2的产生有积极作用,但对SO2产生不利影响。SOF2 的含量几乎不随 φ(O2) 的增加而变化。特性比 φ(SO2F2 + SOF4)/φ(SOF2) 随 φ(O2) 逐渐增大,但随放电时间延长变化不大。X射线光电子能谱表明,放电后板电极表面的固体物质含有Al2O3和AlF3,S主要以金属硫化物形式存在。
更新日期:2020-01-17
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