The analysis to SF6 decomposed component gases is an efficient diagnostic approach to detect the partial discharge in gas-insulated switchgear (GIS) for the purpose of accessing the operating state of power equipment. This paper applied the Au-doped TiO2 nanotube array sensor (Au-TiO2 NTAs) to detect SF6 decomposed components. The electrochemical constant potential method was adopted in the Au-TiO2 NTAs' fabrication, and a series of experiments were conducted to test the characteristic SF6 decomposed gases for a thorough investigation of sensing performances. The sensing characteristic curves of intrinsic and Au-doped TiO2 NTAs were compared to study the mechanism of the gas sensing response. The results indicated that the doped Au could change the TiO2 nanotube arrays' performances of gas sensing selectivity in SF6 decomposed components, as well as reducing the working temperature of TiO2 NTAs.

The detection of partial discharge and analysis of SF6 gas components in gas-insulated switchgear (GIS) is important for the diagnosis and operating state assessment of power equipment. The use of a Pt-doped TiO2 nanotube arrays sensor for detecting sulfur hexafluoride (SF6) decomposition products is proposed in this paper. The electrochemical pulse deposition method is employed to prepare the sensor array. The sensor's response to the main characteristic gaseous decomposition products of SF6 is evaluated. The gas sensing characteristic curves of the Pt-doped TiO2 nanotube sensor and intrinsic TiO2 nanotube arrays sensor are compared. The mechanism of the sensitive response is discussed. Test results showed that the Pt-doped nanoparticles not only change the gas sensing selectivity of the TiO2 nanotube arrays sensor with respect to the main characteristic SF6 decomposition products, but also reduce the operating temperature of the sensor.

Detection of partial discharge and analysis of SF 6 gas components in gas-insulated switchgear are important for diagnosis and operating state assessment of power equipment. The gas-sensing properties of the existing TiO 2 nanotube (TiO 2 NT) array-based and the Pt-doped TiO 2 NT-based sensors were investigated for the components of SF 6 decomposition. Four sensors with different amounts of Pt-doped TiO 2 NTs are prepared using constant current method. The sensing responses of the sensors to the main decomposition gases of SF 6 (i.e., SO 2 , SOF 2 , and SO 2 F 2 ) 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 SO 2 F 2 , whereas a lower doping amount is suitable for detecting SO 2 , which is similar with the capabilities of the intrinsic TiO 2 NT sensor. Moreover, the working temperature of the Pt-doped TiO 2 NT sensor is lower than that of the intrinsic TiO 2 NT sensor.Index Terms -Doping amount, TiO 2 nanotube array, SF 6 decomposition components, Sensor response.