基于特征气体SO2F2的SF6气体绝缘设备的过热性故障诊断
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引用本文:张广东1 ,唐 露2,杨军亭1,温定筠1,刘 康1,王永奇1.基于特征气体SO2F2的SF6气体绝缘设备的过热性故障诊断[J].计算技术与自动化,2021,(1):27-32
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张广东1 ,唐 露2,杨军亭1,温定筠1,刘 康1,王永奇1 (1.国网甘肃省电力公司 电力科学研究院甘肃 兰州 7300702.湖南大学电气与信息工程学院湖南 长沙 410082) 
中文摘要:利用SF6分解产物检测来判断GIS故障发展程度已成为一种有效手段,在搭建的实验平台上展开200℃~360℃局部过热模拟实验,研究SF6热分解特性。当实验温度较高时(320℃~360℃),新增SO2F2、H2S、COS三种产物。在绝缘设备充满大量SF6子的背景下,分解产生的H2和COS的含量极少,给气体检测带来了困难。文中提出将SO2F2作为设备故障进入严重状态的标志气体,同时用量子化学计算法在B3LYP/6-311G(+d,p)水平下对SO2F2生成机理和能量条件进行研究。发现SO2F2通过F2碎片与气室内SO2反应、F原子与SO2F结合、SOF4水解反应这三条途径得到,其中SO2与F2反应是SO2F2的主要来源。实验现象与理论计算均表明:SO2F2的形成机制与高温息息相关,SO2F2出现,标志着设备故障处温度较高,SF6绝缘能力已遭到严重破坏。
中文关键词:量子化学计算  生成机理  反应途径
 
Overheating Fault Diagnosis of SF6 Insulation Equipment Based on Characteristic Gas SO2F2
Abstract:It has become an effective method to judge the fault development of GIS by using the detection of SF6 decomposition products. Overheating simulation experiments were carried out on the established experimental platform to study the thermal decomposition characteristics of SF6.When the experimental temperature was high (320℃~360℃), SO2F2、H2S and COS were detected. Under the background that the gas insulation equipment is filled with a large amount of SF6, the amounts of H2S and COS is very small, which poses a great challenge to gas detection.Based on this, the generationof SO2F2 can effectively reflect the SF6 insulated equipment is under deteriorating.Meanwhile,the generation mechanism and energy conditions of SO2F2 are studied at B3LYP/ 6-311g (+d,p) level by using quantum chemical calculation method.It was found that SO2F2 was produced mainly through the following three reaction pathways: F2 + SO2→SO2F2, F+SO2F→SO2F2,SOF4+H2O→SO2F2+2HF.Experimental phenomena and theoretical calculations have shown that the formation mechanism of SO2F2 is closely related to fault temperature.The presence of SO2F2 indicates that the fault temperature of the equipment is high and SF6 insulation capability has been seriously damaged.
keywords:quantum chemical calculation method  generation mechanism  reaction pathways
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