Sulphur hexafluoride (SF₆) is widely used in gas insulation, and its decomposition products can be used to diagnose potential insulation failures. Quick and accurate detection of decomposition products can help to understand equipment-operating conditions in time. In this study, the decomposition products of SF₆/air gas mixtures under different pulsed discharge voltages were studied. It was found that the main products were SOF₂, SO₂F₂, SO₂, CF₄ and SOF₄, and the yields of SOF₂, SO₂F₂, SO₂ and SOF₄ increased with the number of discharge pulse. The productive rate of SOF₂, SO₂ and SOF₄ were positively correlated with the discharge voltage, and when the discharge voltage increased from 5 to 15 kV, their yields after 50,000 discharges increased by 49%, 120% and 1100%, respectively. The productive rate of SOF₂ and SO₂ were positively correlated with the proportion of air in the gas mixtures while that of SOF₄ was opposite. When the proportion of air increases from 0% to 90%, their yields after 50,000 discharges became 270%, 3169% and 10% of the originals, respectively. In addition, the productive rate of SO₂F₂ was not affected by discharge voltage and the proportion of air in the gas mixtures. SO₂F₂, SOF₂, SOF₄ and SO₂ can be used as the basis for judging the discharge failures and the discharge degree of power equipment.

中文翻译：

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电子附着质谱法检测SF6/空气混合气的分解产物

六氟化硫（SF ₆）广泛用于气体绝缘，其分解产物可用于诊断潜在的绝缘故障。快速准确地检测分解产物有助于及时了解设备运行状况。本研究研究了SF ₆ /空气混合气体在不同脉冲放电电压下的分解产物。发现主要产物为SOF ₂、SO ₂ F ₂、SO ₂、CF ₄和SOF _{4 ，以及SOF 2}、SO ₂ F ₂、SO ₂和SOF ₄的收率。随放电脉冲数的增加而增加。_{SOF 2}、SO ₂和SOF ₄的产率与放电电压呈正相关，当放电电压从5 kV增加到15 kV时，其5万次放电后的产率分别提高了49%、120%和1100%。_{SOF 2}和SO ₂的产率与气体混合物中空气的比例呈正相关，而SOF ₄的产率则相反。当空气比例从0%增加到90%时，其50000次排放后的产量分别为原来的270%、3169%和10%。此外，SO ₂ F _2的产率不受放电电压和气体混合物中空气比例的影响。SO ₂ F ₂、SOF ₂、SOF ₄和SO ₂可作为判断电力设备放电故障和放电程度的依据。