Fabrication of carbon nanotube gas sensor for gas insulated system and its applications

气体绝缘系统(GIS)是基于将所有带电部件完全封闭在金属封装中的原理。在通电部分和接地封装之间使用压缩的SF_6气体作为介质。在本研究中，我们制作了碳纳米管气体传感器，并将其应用于GIS中SF_6分解气体的检测[1]采用介电(DEP)法制备了碳纳米管气体传感器，并将其应用于GIS中SF_6分解气体的检测。发现碳纳米管气敏元件对Pd分解的SF6气体有一定的作用。(1)碳纳米管气敏元件对环境温度和Pd分解产物都很敏感。通过控制碳纳米管气敏元件的工作温度，可以提高碳纳米管气敏元件电导的稳定性和灵敏度。[2]碳纳米管…吸附SF_6钯分解气分析通过两种方法对碳纳米管气敏元件对SF6中Pd响应的更多He分解气体物种进行了实验研究。首先，用傅里叶变换红外光谱分析了吸附在碳纳米管上的分解气体分子。在第二个实验中，测试了碳纳米管气体传感器对几种典型的SF6分解气体(SF4和HF)的响应。此外，基于分子轨道计算的理论预测，讨论了吸附气体分子与碳纳米管之间的电荷转移。基于研究结果，SF4和SOF2被认为是主要的可分解气体。[3]碳纳米管气体传感器的实用化研究研究了在地理信息系统实际运行条件下利用碳纳米管气体传感器进行局部放电检测。碳纳米管气体传感器安装在连接到地理信息系统储罐的外部管道中，可以检测在地理信息系统储罐中产生的局部放电，尽管传感器的响应变得更低和更慢，因为传感器安装在离局部放电源更远的地方。较少

Gas insulated system (GIS) is based on the principle of complete enclosure of all live parts in a metallic encapsulation. Compressed SF_6 gas is used as dielectric medium between the energized parts and grounded encapsulation. In this study, carbon nanotube gas sensor was fabricated and applied to the detection of decomposition gases of SF_6 in GIS[1]PD-etedction using CNT gas sensor in GISCNT gas sensor was fabricated by dielectrophoresis(DEP)-fabrication method and applied to detection of decomposition gases of SF_6 in GIS.Partial discharge (PD) was generated in model-GIS tank. The CNT gas sensor was found to be responsible to the decomposition gases of SF_6 by PD. (1) The CNT gas sensor was sensitive to the ambient temperature as well as to PD-generated decomposition products. The stability and sensitivity of CNT gas sensor conductance could be improved by controlling the operating temperature of CNT gas sensor.[2]Analysis of PD-generated decomposition gases of SF_6 adsorbed on CNTT … More he decomposition gas species responsible for the CNT gas sensor response to PD occurring in SF6 were experimentally investigated according two approaches. At first, the decomposition gas molecules adsorbed on CNT were analyzed by using FTIR spectroscopy. In the second experiment, CNT gas sensor responses to some typical SF6 decomposition gases (SF4 and HF) were measured. Additionally, charge transfer between adsorbed gas molecules and CNT were discussed based on theoretical predictions of molecular orbital calculations. Based on the results, SF4 and SOF2 emerged as candidates for the major responsible decomposition gases.[3]Research for practical use of CNT gas sensorPD detection using CNT gas sensor under practical operating conditions of GIS was studied. The CNT gas sensor, which was installed in an external pipe connected to the GIS tank, could detect PD generated in the GIS tank, although the sensor response became lower and slower as the sensor was installed further from the PD source. Less