Quantitative analysis of FTIR for detecting transformer faults

Honglei Li; Xianyong Liu; Fangjie Zhou; Kexiong Tan

doi:10.1117/12.592448

10 January 2005 Quantitative analysis of FTIR for detecting transformer faults

Honglei Li, Xianyong Liu, Fangjie Zhou, Kexiong Tan

Proceedings Volume 5640, Infrared Components and Their Applications; (2005) https://doi.org/10.1117/12.592448
Event: Photonics Asia, 2004, Beijing, China

Abstract

Recently, Semiconductor sensor and thermal conductivity sensor are widely used for gas detection in transformer online monitors. Since the long-time stability or precision of these sensors is not satisfactory, the present researcher studied the application of FTIR in such monitors. In the wide measuring range of online monitoring, Absorbance Law is not always applicable, thus a non-linear calibration model was necessary. Experiments were done to set up the calibration model. A gas dilution system was designed. With the system, standard samples of fault gas including CH₄, C₂H₂, C₂H₄ and C₂H₆ were diluted to different concentration. BOMEM MB104 FTIR Spectrometer was used to collect spectra of gases. Curve fitting of the output of FTIR was done, and the effect of quantitative feature and concentration range on quantitative analysis was investigated. In addition, the lowest detection limit was tested. Experiment and calculation results show: accuracy can be improved by taking strong peak height at low concentration range, taking peak area or weak peak height at high concentration range as quantitative feature, and using third order polynomial to fit the output curve of FTIR. The lowest detecting limit of C₂H₂ with 2.4m gas cell is below 0.3ml/l and that of 10cm cell is below 3ml/l.

Citation Download Citation

Honglei Li, Xianyong Liu, Fangjie Zhou, and Kexiong Tan "Quantitative analysis of FTIR for detecting transformer faults", Proc. SPIE 5640, Infrared Components and Their Applications, (10 January 2005); https://doi.org/10.1117/12.592448

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