The Quantitative Detection of SF6 Characteristic Decomposition Component H2S Based on Cantilever Enhanced Photoacoustic Spectrometry
Zhang Xiaoxing1, Li Xin1, Liu Heng1,2, Li Jian1,3, Cheng Zheng1
1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China 2.State Grid Chongqing Nan’an Power Supply Company Chongqing 400060 China 3.The Chinese People’s Liberation Army 77109 Troops Chongqing 400074 China
Abstract As one of the key characteristic components caused by SF6 decomposition in the SF6 gas insulated electrical equipment,H2S could effectively reflect the severity of the internal insulation faults and whether the faults involve solid insulation material.The paper builds a cantilever enhanced photoacoustic (PA) spectrometry (CEPAS) trace gas detection system based on the micro cantilever microphone and distributed feedback-diode laser.The characteristic absorption line of H2S with a central wavenumber of 6 336.62 cm-1 in v1+v2+v3 overtones absorption band is selected as the study objective.The frequency response of the CEPAS detection system is tested,and the quantitative relationship between the PA signal amplitude and the gas concentration is studied.The results show that there is a good linear relationship between the PA signal amplitude and the gas concentration.The detection limit of the CEPAS system for tracing H2S in N2 is 0.84*10-6,and H2S in SF6 is 1.75*10-6.It may be a powerful data supplement for the SF6 decomposition components method in recognizing the internal fault category and severity of the SF6 gas insulation electrical equipment.
Zhang Xiaoxing,Li Xin,Liu Heng等. The Quantitative Detection of SF6 Characteristic Decomposition Component H2S Based on Cantilever Enhanced Photoacoustic Spectrometry[J]. Transactions of China Electrotechnical Society, 2016, 31(15): 187-196.
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2016, Vol. 31 
