Influence of Trace H2O and O2 on SF6 Decomposition Characteristics under Corona Discharge Based on Oxygen Isotope Tracer
Zhao Mingyue1,2, Lin Tao1, Yan Xianglian3, Han Dong1,2, Zhang Guoqiang1,2
1. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China;
2. University of Chinese Academy of Sciences Beijing 100049 China;
3. China Electric Power Research Institute Beijing 100192 China
SF6 gas can decompose into lower fluorides of sulfur under electrical discharge, and then these lower fluorides will oxidize in the presence of water vapor and oxygen, resulting in the formation of decomposition by-products such as SO2F2, SOF2 and SO2. SO2F2 is one of the main and stable decomposition by-products of SF6 gas. Since trace H2O and O2 can participate in SF6 decomposition process directly, the formation of SO2F2 is closely related to H2O and O2. In this paper, the effects of H2O and O2 on SF6 decomposition characteristics under corona discharge have been investigated based on oxygen isotope tracer method. By injecting different concentrations of H218O and 18O2, a series of corona discharge experiments are carried out. Then the concentration ratios of the S16O2F2, S18O16OF2 and S18O2F2 are analyzed respectively, under different concentrations of H218O and the ratios of 18O2 to 16O2. Finally, the formation mechanism of SO2F2 is discussed.
赵明月, 林涛, 颜湘莲, 韩冬, 张国强. 基于氧同位素示踪法的电晕放电中H2O和O2对SF6分解气体形成的影响[J]. 电工技术学报, 2018, 33(20): 4722-4728.
Zhao Mingyue, Lin Tao, Yan Xianglian, Han Dong, Zhang Guoqiang. Influence of Trace H2O and O2 on SF6 Decomposition Characteristics under Corona Discharge Based on Oxygen Isotope Tracer. Transactions of China Electrotechnical Society, 2018, 33(20): 4722-4728.
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2018, Vol. 33 
