Evaluation of total acid number (TAN) of synthetic ester retrofilled oil and its correlation with FTIR spectroscopy
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...
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| Main Authors: | , , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2023
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| Online Access: | http://eprints.utem.edu.my/id/eprint/27947/1/Evaluation%20of%20total%20acid%20number%20%28TAN%29%20of%20synthetic%20ester%20retrofilled%20oil%20and%20its%20correlation%20with%20FTIR%20spectroscopy.pdf http://eprints.utem.edu.my/id/eprint/27947/ https://ieeexplore.ieee.org/document/10257322 |
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| Institution: | Universiti Teknikal Malaysia Melaka |
| Language: | English |
| Summary: | 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
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