镍掺杂碳纳米管传感器检测变压器油中溶解气体的气敏性

Ni-doped Carbon Nanotube Sensor for Detecting Dissolved Gases in Transformer Oil

检测变压器油中溶解气体的成分和含量对变压器运行状态的诊断和评估有重要意义。提出一种用镍掺杂的碳纳米管气敏传感器检测变压器油中溶解气体的方法,介绍其制备方法、试验方法及步骤,并对变压器油中气体进行气敏响应测试以及气敏响应机制的探讨。试验结果表明:与混酸修饰的碳纳米管相比,镍掺杂碳纳米管对变压器油中溶解的6种组分气体有更高的灵敏度和响应速度;对低浓度(1～10μL/L)的C2H2气体,传感器的电阻变化率ρ与气体浓度满足一定的线性关系。证明了所研制的传感器具有检测低浓度气体的能力,能够体现变压器油中溶解气体的大致产生情况及近似浓度。

Detection of the composition and content of dissolved gases in transformer oil has an important significance for transformer diagnosis and state assessment. The paper proposed a nickel-doped carbon nanotube gas sensor to detect dissolved gases in transformer oil. The preparation and test method of the developed sensor was introduced. The sensor response was conducted using the test device which detects dissolved gases in transformer oil. Then the response mechanism of gas sensing was analyzed. The results show that, compared to mixed acid modified carbon nanotube, the nickel-doped carbon nanotube has a higher sensitivity and responsiveness to the six dissolved gases in transformer oil, and there is a linear relationship between the relative resistance value p of the sensor and the gas concentration in the low concentration （1-10 laL/L） of the C2H2 gas. It indicates that the developed sensor has a capability of detecting the low concentration gas. Therefore, the sensor can reflect the general situation and approximate concentration of the dissolved gas in transformer oil.