Influence Mechanisms of Trace H₂O on the Generating Process of SF₆ Spark Discharge Decomposition Components

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• 作者：Ju Tang ; Xiajin Rao ; Fuping Zeng ; Wei Cai…
• 关键词：SF6 ; Spark discharge decomposition ; Trace H2O ; Effective generation rate ; Characteristic ratio ; X ; ray photoelectron spectra
• 刊名：Plasma Chemistry and Plasma Processing
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：325-340
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Inorganic Chemistry; Classical Mechanics; Characterization and Evaluation of Materials; Mechanical Engineering;
• 出版者：Springer US
• ISSN：1572-8986
• 卷排序：37

文摘

Trace H₂O directly participates in the SF₆ decomposition generating process under spark discharge, but its mechanism remains ambiguous. Thus, determining the influence rules of trace H₂O on the decomposition characteristics of SF₆ spark discharge is necessary. Moreover, the foundation of the effective spark discharge fault diagnosis methods should be established for SF₆ gas-insulated apparatus. In this paper, a series of spark decomposition experiments of different proportions of SF₆/H₂O mixtures were conducted with a trace H₂O injector accurately controlling H₂O content. Influence mechanisms of trace H₂O on the effective generation rates and the characteristic ratio of spark decomposition components were determined. Results show that trace H₂O remarkably influences the effective generation rates of SF₆ spark decomposition components, including SOF₂, SOF₄, SO₂F₂, SO₂ and CF₄. The characteristic ratio varies because of the distinct mechanisms of H₂O on the components. Mathematical expression between the ratio and H₂O contents was also derived. In addition, the X-ray photoelectron spectra show that the solid materials contain Al₂O₃ and AlF₃, and the existing forms of S are sulfite and sulfate.