检测SF6气体局部放电的多壁碳纳米管薄膜传感器

气体绝缘组合电器(gas insulated switchgear，GIS)的局部放电检测和气体组分分析，对设备运行状态的诊断和评估有着重要的意义。提出一种新的SF6气体中局部放电产生的分解气体检测方法，并研制用于检测SF6局部放电的多壁碳纳米管薄膜传感器。采用一种混酸修饰方法实现了对碳纳米管的官能化修饰，对修饰前后的碳纳米管进行了透射电镜和红外光谱分析。在实验室采用SF6气体分解组分试验装置，对研制的多壁碳纳米管薄膜传感器进行了分解气体检测试验，试验结果表明，研制的MWNTs传感器缺陷多，并含有活性官能团，对SF6气体分解组分吸附能力强，表现出良好的灵敏度和快速响应特性，能反映出分解气体组分的总体情况。

Multi-wall Carbon Nanotube Films Sensor Applied to SF6 PD Detection

The detection of partial discharge (PD) and analysis of SF6 gas components in gas insulated switchgear (GIS), is significant for the diagnosis and operating state assessment of power equipment. A new PD gas decomposition detection method of SF6 is presented. The mixed acid chemical modification method of carbon nanotubes (CNTs) was introduced and the function modification has been obtained, both treated CNTs and untreated ones were analyzed by infrared spectrum and transmission electron microscope (TEM), then the multi-wall carbon nanotubes (MWNTs) film gas sensor were developed. Tests were conducted for MWNTs film sensor in the laboratory using SF6 gas decomposition component testing device. Test results show that, the developed MWNTs sensor has more defects, contains activity functional groups and with strong absorption capacity for SF6 decomposition components, which exhibits good sensitivity and fast response characteristics, and can reflect the overall condition of gas decomposition components.