Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes
Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes
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DOI：
10.1109/tdei.2006.258191
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发表时间：
2006-12-01
影响因子：
3.1
通讯作者：
Minagawa, Tadao
中科院分区：
文献类型：
--
作者：
Ding, Weidong;Hayashi, Ryota;Minagawa, Tadao
化学副产品分析已被公认为是 SF6 气体绝缘开关设备 (GIS) 的有力诊断方法。作者之前已经证明碳纳米管 (CNT) 气体传感器可以检测 SF6 气体中产生的局部放电 (PD)。然而，负责 CNT 气体传感器响应的 PD 产生的分解气体种类尚未确定。在本文中，进行了两种实验以确定负责的分解气体种类。首先，通过傅里叶变换红外（FTIR）光谱分析吸附在碳纳米管上的分解气体分子。将CNT暴露于SF6中产生的PD后，在735 cm(-1)附近观察到FTIR吸光度。在第二个实验中，检查了 CNT 气体传感器对典型 SF6 分解产物（HF 和 SF4）的响应。 CNT 气体传感器对这些气体的响应方式与对 SF6 中产生的局部放电的响应方式相同。 SF4 响应大于 HF 响应。基于这些结果，SF4 和 SOF2 成为负责任的分解气体的候选者。基于分子轨道计算的理论预测，讨论了吸附气体分子和碳纳米管之间的电化学相互作用。计算结果表明SOF2和SF4均能提高CNT气体传感器的电导。
Chemical byproducts analysis has been recognized as a powerful diagnosis method for SF6 gas-insulated switchgear (GIS). The authors have previously demonstrated that a carbon nanotube (CNT) gas sensor could detect partial discharge (PD) generated in SF6 gas. However, PD-generated decomposition gas species, which were responsible for the CNT gas sensor response, have not been identified yet. In this paper, two kinds of experiments were conducted in order to identify the responsible decomposition gas species. At first, the decomposition gas molecules adsorbed on CNTs were analyzed by Fourier transformation infrared (FTIR) spectroscopy. FTIR absorbance was observed around 735 cm(-1) after CNTs were exposed to PD generated in SF6. In the second experiment, the CNT gas sensor responses to typical SF6 decomposition products (HF and SF4) were examined. The CNT gas sensor responded to these gases in the same way as to PD generated in SF6. SF4 response was larger than HF response. Based on these results, SF4 and SOF2 emerged as candidates for the responsible decomposition gases. Electrochemical interactions between adsorbed gas molecules and CNT were discussed based on theoretical predictions of molecular orbital calculations. The calculation results suggested that both of SOF2 and SF4 could increase the CNT gas sensor conductance.