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SF6在故障温度为300~400℃时的分解特性研究

, PP. 202-210

Keywords: 六氟化硫,过热性故障,分解规律,稳定特征产物,关联图谱

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Abstract:

为了探索SF6绝缘气体在过热故障状态下的分解特性及其分解机制,完善利用SF6分解特性辨识SF6电气设备绝缘故障的方法,该文利用研制的SF6电气设备过热性故障模拟装置进行了系列探索性实验,对SF6过热分解组分采用气相色谱法(gaschromatograph,GC)和气相色谱?质谱联用法(gaschromatography-massspectrometry,GC-MS)进行定量检测,初步得到SF6在400℃以下的过热分解特性。在此基础上探索SF6的初始分解温度,研究了分解产物组成类型和不同温度下各自的形成规律,并选定了SF6在过热状态分解时所形成的主要特征分解组分,构建了特征分解组分与温度之间的关联图谱。结果表明:SF6大约在300℃时开始出现比较明显的分解,其主要分解产物有CO2、SO2F2、SOF2、SOF4、SO2、H2S,但不含CF4;温度的升高将加剧SF6气体的分解,促进各分解组分的形成,但对各分解产物的促进程度却因组分种类的不同而规律各异;SOF2和SO2是SF6在过热故障温度为300~400℃时的最主要分解特征产物,二者的产气速率图谱可有效表征SF6电气设备过热故障点处的温度,为下一步诊断SF6电气设备过热故障提供参考。

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