检测变压器油中溶解气体的碳nm管传感器研制

Carbon Nanotubes Gas Sensor Applied to Detection of Dissolved Gases in Oil

对变压器油中溶解气体进行检测分析是判断油浸式电力变压器早期潜伏性故障的重要手段。为克服常用油气分析方法的缺点,提出了一种基于碳nm管传感器检测油中气体的方法,并研制了一种用混酸修饰,以印刷电路板为基底,用于检测油中气体的多壁碳nm管传感器。分析了碳nm管膜的电学特性以及气敏响应机理,在实验室采用甲烷等标气对修饰前后的传感器的气敏性进行了测试,试验结果表明,用经混酸修饰后的样品缺陷多,并含有活性官能团,对油中气体表现出较强的吸附性,具有良好的灵敏度和快速响应特性。

The detection and analysis of dissolved gases in oil is an important means to determine the early latent faults of oil-immersed power transformer.A dissolved gases in oil detection method is presented based on carbon nanotubes sensor.A kind of MWNTs（Multi-wall carbon nanotubes） gas sensor modified by mixed acid was developed based on printed circuit board to detect dissolved gases in oil.The electrical properties and gas sensing response mechanism of carbon nanotubes（CNTs） was analyzed.The gas sensing response for dissolved gases in oil was tested using the MWNTs sensor in the laboratory.Test results showed that,the developed MWNTs sensor has more defects,contains activity functional groups and with strong absorption capacity for dissolved gases in oil, which exhibits good sensitivity and fast response characteristics.