Paper lifetime mathematical modelling based on multi pre-exponential factors for oil-immersed transformer

Najiyah Saleh and Norhafiz Azis and Jasronita Jasni and Mohd Zainal Abidin Ab Kadir and Mohd Aizam Talib. (2022) Paper lifetime mathematical modelling based on multi pre-exponential factors for oil-immersed transformer. Pertanika Journal of Science & Technology (Malaysia), 30 (2). 1115 -1133. ISSN 2231-8526

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.

Full text available from: Official URL: http://www.pertanika.upm.edu.my/resources/files/Pe...

Abstract

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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Item Type:	Article
AGROVOC Term:	insulation
AGROVOC Term:	paper
AGROVOC Term:	ageing
AGROVOC Term:	electronics
AGROVOC Term:	mathematical models
AGROVOC Term:	research
AGROVOC Term:	evaluation
AGROVOC Term:	effects
AGROVOC Term:	oxygen
Geographical Term:	Malaysia
Uncontrolled Keywords:	Arrhenius equation, cellulose ageing, life estimation, paper ageing, pre-exponential factor
Depositing User:	Ms. Azariah Hashim
Date Deposited:	12 Nov 2024 02:19
Last Modified:	12 Nov 2024 02:19
URI:	http://webagris.upm.edu.my/id/eprint/1741

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