New near-infrared absorbance peak for inhibitor content detection in transformer insulating oil

•Characterization of inhibitor content in insulating oil in the NIR waveband.•It was found that inhibitor content causes an optical absorbance peak at 1403 nm.•A mathematical model was formed and verified for inhibitor concentration.•Low cost portable inhibitor content measuring devices is made poss...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-08, Vol.266, p.577-582
Main Authors: Leong, Yang Sing, Ker, Pin Jern, Jamaludin, M.Z., Nomanbhay, Saifuddin M., Ismail, Aiman, Abdullah, Fairuz, Looe, Hui Mun, Shukri, C. Nuru Saniyyati M.
Format: Article
Language:English
Subjects:
Absorbance
Condition monitoring
Dissolved gases
Electric power
Fourier transforms
Infrared spectroscopy
Inhibitors
Insulating oil
Insulation
Mathematical models
Near infrared radiation
Optical spectroscopy
Power transformers
Preventive maintenance
Root-mean-square errors
Spectrum analysis
Transformers
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Summary:•Characterization of inhibitor content in insulating oil in the NIR waveband.•It was found that inhibitor content causes an optical absorbance peak at 1403 nm.•A mathematical model was formed and verified for inhibitor concentration.•Low cost portable inhibitor content measuring devices is made possible. 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.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2018.03.064