Decomposition characteristics of SF6 under overheating conditions
Decomposition characteristics of SF6 under overheating conditions
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DOI：
10.1109/tdei.2017.006572
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发表时间：
2017-12
影响因子：
3.1
通讯作者：
Jiachen Wang;W. Ding;Jiaqi Yan;Yanan Wang;Yongsheng Wang;Zhichuang Li;Guojun Li
中科院分区：
文献类型：
--
作者：
Jiachen Wang;W. Ding;Jiaqi Yan;Yanan Wang;Yongsheng Wang;Zhichuang Li;Guojun Li
过热是气体绝缘组合电器（GIS）的严重缺陷之一。然而，在过热条件下SF6的分解特性的研究相对有限。本文研究了固体绝缘过热、金属过热和绝缘材料附近金属过热三种过热条件下SF6气体的分解产物。讨论了过热温度、气体压力、初始含水率和吸附剂对SF6分解特性的影响。结果表明：SF6气体在固体绝缘过热下的典型分解产物为H2、CO、CO2、CH 4、SOF 2、SO2、H2S、COS和CF 4; SF6气体在金属过热下的典型分解产物为SOF 2、SO2、CO和CO2。此外，SF6在邻近绝缘材料的金属过热下的典型分解产物是CO、CO2、SOF 2、SO2、CF 4、CS2和COS。过热的类型可以通过（SOF 2 +SO2）/（CO+CO2）的特征比率来识别：对于固体绝缘过热，该比率为0至0.25，对于涉及金属的过热，该比率大于1。涉及金属的两种类型的过热可以通过其特征产物如CS2、COS和CF 4来区分。
Overheating is one of the severe defects in gas-insulated switchgear (GIS). However, researches on decomposition characteristics of SF6 under overheating conditions are relatively limited. In this paper, SF6 decomposition products are studied under three overheating conditions which are overheating of solid insulation, overheating of metal, and overheating of metal adjacent to insulating material. Influence of overheating temperature, gas pressure, initial moisture content and adsorbent on the decomposition characteristics of SF6 is discussed. The results show that typical decomposition products of SF6 under overheating of solid insulation are H2, CO, CO2, CH4, SOF2, SO2, H2S, COS and CF4, and typical decomposition products of SF6 under overheating of metal are SOF2, SO2, CO and CO2. Besides, typical decomposition products of SF6 under overheating of metal adjacent to insulating material are CO, CO2, SOF2, SO2, CF4, CS2 and COS. Types of overheating can be recognized by characteristic ratio of (SOF2+SO2)/(CO+CO2): for overheating of solid insulation, the ratio is 0 to 0.25, and for overheating involving metal, it is greater than 1. Two types of overheating involving metal can be distinguished by their characteristic products such as CS2, COS and CF4.