Cantilever enhanced photoacoustic spectrometry: Quantitative analysis of the trace H2S produced by SF6 decomposition |
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| Institution: | 1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;2. School of Electrical Engineering, Wuhan University, Hubei 430072, China;1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;2. Laboratoire de Physicochimie de l’Atmosphère, Université du Littoral Côte d’Opale, 189A, Av. Maurice Schumann, 59140 Dunkerque, France;1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;2. School of Electrical Engineering, Wuhan University, Wuhan 430072, China;1. Institute of Laser Physics SB RAS, Laboratory of IR Laser Systems, 15B, Ac. Lavrentieva Ave., Novosibirsk 630090, Russia;2. Institute of Laser Physics SB RAS, Laboratory of Laser Electronic Systems, 15B, Ac. Lavrentieva Ave., Novosibirsk 630090, Russia;1. IES, Univ. Montpellier, CNRS, F-34000 Montpellier, France;1. State Key Laboratory of Electrical Insulation for Power Equipment, Xi''an Jiaotong University, Xi''an, 710049, PR China;2. State Grid Changzhi Power Supply Company, Changzhi, 046000, PR China;1. Optics and Nanophotonics Department, Institute of Physics, Kazan Federal University, Kazan, Russia;2. Physics Research Center, Imam Hossein University, Tehran, Iran;3. Physics Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran |
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| Abstract: | As one of the key characteristic components that result from sulfur hexafluoride (SF6) decomposition in SF6 gas-insulated equipment, hydrogen sulfide (H2S) can reflect the severity of the internal insulation faults and indicate whether or not such faults involve solid insulation material effectively. The decomposition of SF6 and its reaction with other impurities to form H2S are simulated in this study via Materials Studio. The simulation verifies that H2S is generated only when serious faults occur in the equipment; thus, the online monitoring of the trace H2S is highly necessary. To achieve a high detection accuracy and avoid cross interference, the spectral line R (8) of the H2S ν1 + ν2 + ν3 co-frequency absorption band is taken as the absorption line for the gas detection by online simulation based on the HITRAN on the Web. In addition, this study develops a cantilever-enhanced photoacoustic spectrometry trace gas detection platform and conducts experimental research on the quantitative detection of trace H2S/SF6 and H2S/N2. Experimental results show that the detection sensitivity of the detection platform to trace H2S under the background gas N2 and SF6 is 0.84 and 1.75 μL/L, respectively, and a strong linear relationship exists between the trace H2S concentration and its corresponding PA signal. Moreover, based on both the theoretical simulation and experiment, the influence of temperature and pressure on the detection platform is discussed and analyzed. The results indicate that the change in the PA signal amplitude decreases with an increase in the pressure or temperature of the PA cell, and the detection platform is more sensitive to pressure. |
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| Keywords: | Sulfur hexafluoride Hydrogen sulfide Cantilever-enhanced Photoacoustic spectrometry |
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