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Color index of transformer oil: a low-cost measurement approach using ultraviolet-blue laser


Hasnul Hadi, Muhamad Haziq and Pin, Jern Ker and Hui, Jing Lee and Yang, Sing Leong and Mahammad A., Hannan and Jamaludin, Md. Zaini and Mahdi, Mohd Adzir (2021) Color index of transformer oil: a low-cost measurement approach using ultraviolet-blue laser. Sensors, 21 (21). pp. 1-12. ISSN 1424-8220


The color of transformer oil can be one of the first indicators determining the quality of the transformer oil and the condition of the power transformer. The current method of determining the color index (CI) of transformer oil utilizes a color comparator based on the American Society for Testing and Materials (ASTM) D1500 standard, which requires a human observer, leading to human error and a limited number of samples tested per day. This paper reports on the utilization of ultra violet-blue laser at 405- and 450-nm wavelengths to measure the CI of transformer oil. In total, 20 transformer oil samples with CI ranging from 0.5 to 7.5 were measured at optical pathlengths of 10 and 1 mm. A linear regression model was developed to determine the color index of the transformer oil. The equation was validated and verified by measuring the output power of a new batch of transformer oil samples. Data obtained from the measurements were able to quantify the CI accurately with root-mean-square errors (RMSEs) of 0.2229 for 405 nm and 0.4129 for 450 nm. This approach shows the commercialization potential of a low-cost portable device that can be used on-site for the monitoring of power transformers.

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Official URL or Download Paper: https://www.mdpi.com/1424-8220/21/21/7292

Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.3390/s21217292
Publisher: Multidisciplinary Digital Publishing Institute
Keywords: ASTM D1500; Color; Insulating oil; Power transformers; Single wavelength; Transformer oil; Ultraviolet-blue wavelength
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 26 Jan 2023 02:25
Last Modified: 26 Jan 2023 02:25
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/s21217292
URI: http://psasir.upm.edu.my/id/eprint/96432
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