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Paper Lifetime Mathematical Modelling based on Multi Pre-Exponential Factors for Oil-Immersed Transformer

Najiyah Saleh, Norhafiz Azis, Jasronita Jasni, Mohd Zainal Abidin Ab Kadir and Mohd Aizam Talib

Pertanika Journal of Social Science and Humanities, Volume 30, Issue 2, April 2022

DOI: https://doi.org/10.47836/pjst.30.2.15

Keywords: Arrhenius equation, cellulose ageing, life estimation, paper ageing, pre-exponential factor

Published on: 1 April 2022

This work examines the impact of multi pre-exponential factors on the lifetime modelling of the paper in oil-immersed transformers. First, the corresponding pre-exponential factor was determined based on the concentrations of the three parameters known as oxygen, moisture and acid. Next, the pre-exponential factor for each of the parameters at different concentrations was combined based on the summative approach to obtain the overall impact on the lifetime of the paper. It is found that the expected life of the paper for overall multi pre-exponential factors is higher than either single or double pre-exponential factors. For a single pre-exponential factor, the expected life of the paper decreases by a factor of 59.8 as the oxygen concentration increases from 15,000 ppm to 210,000 ppm. Moisture can decrease the expected life of the paper by a factor of 34 as it increases from 0.5% to 5%. Low molecular weight acid (LMA) has a higher impact than high molecular weight acid (HMA), whereby its impact is further enhanced through multi pre-exponential factor effect whereby the expected life of the paper decreases by a factor of 7.9 as the moisture content increases from 0.5% to 5% and oxygen increases from 300 ppm to 20,000 ppm.

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ISSN 0128-7702

e-ISSN 2231-8534

Article ID

JST-3250-2021

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