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UV-Vis spectra and moisture content of retrofilled aged mineral oil with synthetic ester


Othman, N. A. and Zainuddin, H. and Yahaya, M. S. and Azis, N. and Ibrahim, Z. and Musni, M. A. C. (2023) UV-Vis spectra and moisture content of retrofilled aged mineral oil with synthetic ester. In: 2023 IEEE 3rd International Conference in Power Engineering Applications (ICPEA 2023), 6-7 Mar. 2023, Putrajaya, Malaysia. (pp. 105-108).


Retrofilling aged mineral oil (AMO) with ester oils is now being explored as an alternative option for the extension of transformer life. In transformer retrofilling, there is up to 10 % of aged mineral oil will be mixed with new oil. It is anticipated that the dielectric properties of the ester oil will be affected when the oils are mixed together. In this paper, synthetic ester (SE) oil was investigated in terms of its physicochemical properties after being mixed with various proportions of aged mineral oil. An accelerated thermal aging of mineral oil has been firstly prepared prior to the retrofilling with SE oil. The mineral oil was aged in a vacuum oven at 130 °C for 150 hours. There are three different proportions, i.e. 3 %, 5 % and 7 % were selected for use in the retrofilling process. Further, the retrofilled aged mineral-synthetic ester (AMO/SE) oil was tested for the moisture content and evaluation of degradation products through Ultraviolet-Visible Spectroscopy (UV-Vis) spectra. Based on the findings, it was interestingly found that the higher proportion of AMO has reduced the moisture content of retrofilled AMO/SE. In terms of UV-Vis spectra, the higher proportion of AMO has increased the absorbance with longer wavelength and it is in line with the concentration of dissolved decay products (DDPs). Overall, the moisture content and the concentration of DDPs of retrofilled AMO/SE has still meet the requirement as a new oil.

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Official URL or Download Paper: https://ieeexplore.ieee.org/document/10093173

Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.1109/ICPEA56918.2023.10093173
Publisher: IEEE
Keywords: Retrofilling; Power transformer; Synthetic ester; Mineral oil; Moisture content; UV-Vis spectra
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 28 Sep 2023 05:24
Last Modified: 28 Sep 2023 05:24
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1109/ICPEA56918.2023.10093173
URI: http://psasir.upm.edu.my/id/eprint/37707
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