A Pt-Doped TiO2 Nanotube Arrays Sensor for Detecting SF6 Decomposition Products

Abstract

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.

Adsorptions of SO2, SOF2, and SO2F2 on Pt-modified anatase (101) surface: Sensing mechanism study

“…Results of preliminary gas-sensing experiments show that intrinsic TNTA and Pt-modified TNTA can be used to detect different concentrations of SO 2 , SOF 2 , and SO 2 F 2 under certain conditions. Intrinsic TNTA is suitable for detecting SO 2 (response: SO 2 > SOF 2 > SO 2 F 2 ), whereas Pt-modified TNTA is suitable for detecting SO 2 F 2 (response: SO 2 F 2 > SO 2 ≈ SOF 2 ) [9,10].…”

Comparative Study of Materials to SF6 Decomposition Components

“…To detect, evaluate, and diagnose the insulation status of SF 6 gas insulated equipment using the characteristics of SF 6 decomposition, a series of characteristic SF 6 decomposition components, SOF 2 , SO 2 F 2 , SO 2 , H 2 S, CF 4 , HF, and SF 6 , are detected by gas sensors, including metal functionalized single wall carbon nanotubes (SWCNTs) [1][2][3][4][5][6], TiO 2 nanotubes [7][8][9], and graphene gas sensors [10,11], as shown in Table 1. According to the theoretical calculation results, these three kinds of gas-sensing materials are not sensitive to the background gas SF 6 and decomposition component CF 4 .…”

Experimental Analysis of Modified CNTs-Based Gas Sensor

“…Dissolved gas-in-oil analysis (Oil-DGA) is the most convenient and effective method of judging the early potential fault of oil-immersed power transformers at present [6][7][8], and the method is the most extensive one in the real application, which has become an indispensable approach to judge the internal fault of oil-filled electrical equipment and oversee the safe operation of equipment [9]. Research shows that, among main obstacle and defects of transformers discovered by experiment examinations, faults found by dissolved gas analysis of test standard always take up the highest percentage, 60.1% in 2004 and 68.5% in 2005 [10].…”