Portable NIR Spectroscopy Measuring Device for Transformer Oil DBPC Inhibitor Analysis

Monitoring the insulation system of power transformers is crucial in ensuring power transformers are operating in optimal conditions. Given the nondirect and destructive nature of conventional techniques, optical techniques have prevailed to be an effective alternative to monitor the condition of th...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2021-05, Vol.57 (3), p.2114-2119
Main Authors: Leong, Yang S., Ker, Pin Jern, Hasnul, Muhamad Haziq, Khamis, Mahdi A., Hannan, M. A., Jamaludin, Md. Zaini, Looe, Hui Mun
Format: Article
Language:English
Subjects:
Ditertiary butyl para cresol (DBPC) inhibitors
Infrared spectra
Infrared spectroscopy
Inhibitors
Insulation
Measuring instruments
Monitoring
Near infrared radiation
near-infrared spectroscopy
Oil insulation
Oils
Onsite
Optical components
Optics
portable device
Portable equipment
Power transformer insulation
Prototypes
Spectroscopic analysis
Spectroscopy
Spectrum analysis
transformer oil
Transformers
Wavelength measurement
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Summary:Monitoring the insulation system of power transformers is crucial in ensuring power transformers are operating in optimal conditions. Given the nondirect and destructive nature of conventional techniques, optical techniques have prevailed to be an effective alternative to monitor the condition of the insulation system. The recent development of small and compact optical components has also contributed to the utilization of optical techniques in onsite testing and online monitoring application. Therefore, this work proposed the measurement of inhibitor concentration in transformer oil by using a portable optical measuring device that utilizes near-infrared spectroscopy. The fundamental studies of measuring inhibitor in transformer oil by using a newly discovered wavelength at 1403 nm were validated, and its adaptation to a portable optical measuring device was discussed. A new mathematical model was formulated to estimate the inhibitor concentration in transformer oil samples on the basis of data obtained from the photodetector. Measurements and the conventional technique were conducted for performance comparison and prototype verification. Results showed a root-mean-square-error of 0.01708 and an average error of 2.11%. This proposed prototype opens up opportunities in onsite testing and online monitoring of inhibitor content concentration in transformer oil.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2021.3057357