ANN-based calibration model of FTIR used in transformer online monitoring

Honglei Li; Xian-yong Liu; Fangjie Zhou; Kexiong Tan

doi:10.1117/12.597244

10 February 2005 ANN-based calibration model of FTIR used in transformer online monitoring

Honglei Li, Xian-yong Liu, Fangjie Zhou, Kexiong Tan

Proceedings Volume 5638, Optical Design and Testing II; (2005) https://doi.org/10.1117/12.597244
Event: Photonics Asia, 2004, Beijing, China

Abstract

Recently, chromatography column and gas sensor have been used in online monitoring device of dissolved gases in transformer oil. But some disadvantages still exist in these devices: consumption of carrier gas, requirement of calibration, etc. Since FTIR has high accuracy, consume no carrier gas and require no calibration, the researcher studied the application of FTIR in such monitoring device. Experiments of “Flow gas method” were designed, and spectrum of mixture composed of different gases was collected with A BOMEM MB104 FTIR Spectrometer. A key question in the application of FTIR is that: the absorbance spectrum of 3 fault key gases, including C₂H₄, CH₄ and C₂H₆, are overlapped seriously at 2700~3400cm^-1. Because Absorbance Law is no longer appropriate, a nonlinear calibration model based on BP ANN was setup to in the quantitative analysis. The height absorbance of C₂H₄, CH₄ and C₂H₆ were adopted as quantitative feature, and all the data were normalized before training the ANN. Computing results show that the calibration model can effectively eliminate the cross disturbance to measurement.

Citation Download Citation

Honglei Li, Xian-yong Liu, Fangjie Zhou, and Kexiong Tan "ANN-based calibration model of FTIR used in transformer online monitoring", Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); https://doi.org/10.1117/12.597244

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