Othman, Nur Amirah and Zainuddin, Hidayat and Yahaya, Muhammad Sharil and Azis, N. and Ibrahim, Zulkifli and Musni, M.A.C. (2023) Evaluation of total acid number (TAN) of synthetic ester retrofilled oil and its correlation with FTIR spectroscopy. In: 4th International Conference on High Voltage Engineering and Power Systems, ICHVEPS 2023, 6 August 2023through 10 August 2023, Denpasar Bali.
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Evaluation of total acid number (TAN) of synthetic ester retrofilled oil and its correlation with FTIR spectroscopy.pdf Restricted to Repository staff only Download (540kB) |
Abstract
Retrofilling of an existing mineral oil-immersed transformer with ester oil is an alternative approach to extend the lifespan of transformers. This is associated with the excellent properties of ester oil that has high tolerance to moisture that promotes an advantage to prolong the life of paper insulation. However, the retrofilling process will mix the fresh ester oil with the remaining aged mineral oil in the transformer oil, and eventually affects the performance of the new ester oil. Therefore, it is essential to access the performance of mixed oil in order to detect any signs of oil degradation as a result of retrofilling, prior to transformer energization. In this paper, the total acid number (TAN) and Fourier Transform Infrared (FTIR) spectra were measured and analyzed to assess the condition of mixed aged mineral-synthetic ester oil (AMO/SE). Three different proportions of aged mineral oil (AMO), i.e. 3 %, 5 % and 7 % were prepared to simulate different amount of mineral oil residue in a transformer before being retrofilled with fresh synthetic ester oil. The AMO were prepared through thermally ageing of fresh mineral oil in a vacuum oven at 130 °C for 150 hours. Based on the findings, it has been intriguingly discovered that the acid number of the AMO/SE oil has decreased as the percentage of AMO increased in fresh synthetic ester oil. In correlation with FTIR spectra, the present acid concentration of the degradation by-product of the retrofilled AMO/SE oils can be observed in carbonyl stretch region at the wavelength of 1700 – 1800 .
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Uncontrolled Keywords: | Fourier transform infrared (FTIR), Mineral oil, Power transformer, Retrofilling, Synthetic ester, Total acid number (TAN) |
| Divisions: | Faculty Of Electrical Technology And Engineering |
| Depositing User: | Maizatul Najwa Ahmad |
| Date Deposited: | 14 Oct 2024 15:51 |
| Last Modified: | 14 Oct 2024 15:51 |
| URI: | http://eprints.utem.edu.my/id/eprint/27947 |
| Statistic Details: | View Download Statistic |
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