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SO2作为SF6气体在局部放电作用下的重要特征分解组分,其体积分数大小和变化规律可用于判断SF6绝缘设备内局部放电的严重程度。为提高碳纳米管传感器对SO2气体的检测灵敏度,实现对SO2气体的快速实时检测,提出了一种分子筛掺杂碳纳米管制备气敏传感器的方法,研究了不同掺杂比例的传感器对体积分数为10-4的SO2气体的气敏响应特性,并对反应机理进行了初步探讨。结果表明:与本征碳纳米管相比,4A分子筛掺杂制备出的碳纳米管气敏传感器对SO2的灵敏度有了显著提高,电阻变化率从0.96%最大提高至33.7%,并且传感器具有良好的重复性和稳定性,多次重复试验表明传感器电阻变化率保持稳定。研究结果为最终实现SF6气体绝缘设备中SO2气体的在线监测奠定了试验基础。
As an important characteristic decomposition component of SF6 gas under partial discharge, SO2 volume fraction and its variation can be used to determine the severity of partial discharge in SF6 insulation equipment. In order to improve the detection sensitivity of carbon nanotube sensor to SO2 gas and realize the rapid real-time detection of SO2 gas, a method of preparing gas sensor by using carbon nanotube doped with molecular sieve was proposed. The effects of different doping ratio on volume fraction Gas-sensing response of 10-4 SO2 gas, and the reaction mechanism was preliminarily discussed. The results show that compared with the intrinsic carbon nanotubes, the sensitivity of the carbon nanotube gas sensor prepared by 4A molecular sieve doping to SO2 has been significantly improved, the rate of change of resistance is increased from 0.96% to 33.7%, and the sensor has a good Repeatability and stability, repeated tests show that the sensor resistance rate of change remained stable. The results laid the foundation for the final realization of on-line monitoring of SO2 gas in SF6 gas insulated equipment.