Quantitative Analysis of Transformer Oil Dissolved Gases Using FTIR
ZHAO An-xin1, 2, TANG Xiao-jun1*, WANG Er-zhen1, ZHANG Zhong-hua1, 3, LIU Jun-hua1
1. Xi’an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China 2. Xi’an University of Science and Technology, Xi’an 710054, China 3. National Institute of Metrology, Beijing 100013, China
Abstract：For the defects of requiring carrier gas and regular calibration, and low safety using chromatography to on line monitor transformer dissolved gases, it was attempted to establish a dissolved gas analysis system based on Fourier transform infrared spectroscopy. Taking into account the small amount of characteristic gases, many components, detection limit and safety requirements and the difficulty of degasser to put an end to the presence of interference gas, the quantitative analysis model was established based on sparse partial least squares, piecewise section correction and feature variable extraction algorithm using improvement TR regularization. With the characteristic gas of CH4, C2H6, C3H6, and CO2, the results show that using FTIR meets DGA requirements with the spectrum wave number resolution of 1 cm-1 and optical path of 10 cm.
Key words：Fourier transform infrared spectroscopy;Dissolved gas analysis;Quantitative analysis;Sparse partial least squares;On-line monitoring
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