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Pressure Characteristics of Dissolved Acetylene in Transformer Oil Based on Photoacoustic Spectroscopy Detection |
Chen Weigen1, Wan Fu1, Zhou Qu1, Zhao Lizhi1, Liao Chao2 |
1. State Key Laboratory of Power Transmission Equipment and System Security and New TechnologyChongqing University Chongqing 400044 China; 2. Chongqing Nanchuan District Power Supply Limited Liability Company of State Grid Chongqing 620010 China |
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Abstract Dissolved gas analysis(DGA) method is one of the most effective means in fault diagnosis of power transformer. Gas photoacoustic spectroscopy(PAS) can be well applied in gas detection. The effect of gas pressure on the photoacoustic spectroscopy detection is significant. Functional relations between gas pressure and gas absorption coefficient, resonant frequency, quality factor, photoacoustic cell constant and PA voltage(PAV) signal are derived theoretically in this paper. Based on the constructed tunable experimental setup, experimental detection of the acetylene dissolved in transformer oil was done. The experimental results show the correctness of the functional relations above and that PAV signal has a good linear dependence on the 1.5th root of pressure P(0<P<75kPa) and the square root of P(75kPa<P<100kPa) when without gas absorption saturation effect. Taking consideration of absorption line broadening and the change rule of PAV signal, the best gas pressure for the photoacoustic spectroscopy detection of acetylene absorption line 6 578.58cm-1 is 75kPa. The theoretical and experimental results provide technical support for further improvement in photoacoustic spectroscopy on-line monitoring for oil gas.
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Received: 16 April 2013
Published: 23 March 2015
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