On-line monitoring of dissolved gas-in-oil with FTIR spectra

Xianyong Liu, Yunluo Liu ,and Li YueSchool of Information and Control Engineering, Southwest University of Science and Technology, Mianyang 621002, ChinaInformation Engineering School, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Adults and Online Distance Education, Southwest University of Science and Technology, Mianyang 621002, China

摘 要：<正> To overcome the disadvantages of conventional DGA （dissolved gas-in-oil） analysis using gas chromatography and other electrochemical sensors, initial researches were completed to realize on-line monitoring of dissolved gas-in-oil of power transformers using FTIR （Fourier Transform InfraRed） spectroscopy. Gas cell method is used to determine the characteristic absorption peaks of each diagnostic gas; simple and novel devices and procedures were designed in order to get measurable samples and spectra of mixed diagnostic gases with known concentration are taken using long optical path gas cell. The range of wavelength is estimated to be 3.0-

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