Abstract
Detection of partial discharge and analysis of SF6 gas components in gas-insulated switchgear are important for diagnosis and operating state assessment of power equipment. The gas-sensing properties of the existing TiO2 nanotube (TiO2NT) array-based and the Pt-doped TiO2NT-based sensors were investigated for the components of SF6 decomposition. Four sensors with different amounts of Pt-doped TiO2NTs are prepared using constant current method. The sensing responses of the sensors to the main decomposition gases of SF6 (i.e., SO2, SOF2 and SO2F2) are examined, and the gas-sensing characteristic curves are comparatively analyzed. In addition, the mechanisms of the sensitive responses are discussed. Results show that a higher doping amount of Pt benefits the detection of SO2F2, whereas a lower doping amount is suitable for detecting SO2, which is similar with the capabilities of the intrinsic TiO2NT sensor. Moreover, the working temperature of the Pt-doped TiO2NT sensor is lower than that of the intrinsic TiO2NT sensor.
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