Publication: New near-infrared absorbance peak for inhibitor content detection in transformer insulating oil
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Date
2018
Authors
Leong Y.S.
Ker P.J.
Jamaludin M.Z.
Nomanbhay S.M.
Ismail A.
Abdullah F.
Looe H.M.
Shukri C.N.S.M.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier B.V.
Abstract
Monitoring the condition of transformer insulating oil has been considered as a crucial and effective measure for preventive maintenance of power transformers. Various properties of the oil can be monitored such as the dissolved gases, furan content, and inhibitor content. This paper focuses on the inhibitor content in insulating oil. Currently, Fourier transform infrared (FTIR) spectroscopy in accordance with the IEC 60666 standard is used for the measurement of inhibitor concentration in insulating oil. However, this technique involves site sampling, transportation to a laboratory and an expensive instrument. This work proposes the characterization of inhibitor content in insulating oil in the near-infrared (NIR) waveband, which would lead to the design of a faster and cheaper detection system for inhibitor content. It was found that the inhibitor content exhibits an optical absorbance peak at 1403 nm, which was not reported in any previous work. A mathematical model was then created to describe the relationship between the concentration of inhibitor, the area under the absorbance spectrum and the peak optical absorbance. The model was verified, and the results showed a root mean square error (RMSE) of 0.0458. � 2018 Elsevier B.V.
Description
Chemical detection; Corrosion inhibitors; Fourier transform infrared spectroscopy; Infrared devices; Infrared spectroscopy; Insulating oil; Insulation; Mean square error; Power transformers; Absorbance spectrum; Content detection; Effective measures; Inhibitor concentration; Near-infrared waveband; Optical absorbance; Optical spectroscopy; Root mean square errors; Oil filled transformers