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Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose

The aim of this study is to propose a test method for the determination of the quality of transformer paper insulation. For this purpose, the oil/cellulose insulation systems were exposed to various accelerated aging tests. The results of the aging experiments of normal Kraft and thermally upgraded...

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Autores principales: Mihajlovic, Draginja, Vasovic, Valentina, Lukic, Jelena
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10255721/
https://www.ncbi.nlm.nih.gov/pubmed/37299354
http://dx.doi.org/10.3390/polym15112556
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author Mihajlovic, Draginja
Vasovic, Valentina
Lukic, Jelena
author_facet Mihajlovic, Draginja
Vasovic, Valentina
Lukic, Jelena
author_sort Mihajlovic, Draginja
collection PubMed
description The aim of this study is to propose a test method for the determination of the quality of transformer paper insulation. For this purpose, the oil/cellulose insulation systems were exposed to various accelerated aging tests. The results of the aging experiments of normal Kraft and thermally upgraded papers, two different types of transformer oil (mineral and natural ester), and copper are shown. Aging was carried out in various experiments at 150 °C, 160 °C, 170 °C, and 180 °C with dry (initial values ≤ 0.5%) and moistened cellulose insulation (initial values 3–3.5%). Following insulating oil and paper, degradation markers were measured: the degree of polymerization, tensile strength, furan derivates, methanol/ethanol, acidity, interfacial tension, and dissipation factor. It was found that the aging of cellulose insulation in cycles was 1.5–1.6 times faster in comparison to continuous aging, due to the more pronounced effect of hydrolytic mechanism in cyclic aging owing to the produced and absorbed water. Furthermore, it was observed that the high initial water content in cellulose increases the aging rate two to three times more than in the dry experimental setup. The proposed aging test in cycles can be used to achieve faster aging and to compare the quality of different insulating papers.
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spelling pubmed-102557212023-06-10 Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose Mihajlovic, Draginja Vasovic, Valentina Lukic, Jelena Polymers (Basel) Article The aim of this study is to propose a test method for the determination of the quality of transformer paper insulation. For this purpose, the oil/cellulose insulation systems were exposed to various accelerated aging tests. The results of the aging experiments of normal Kraft and thermally upgraded papers, two different types of transformer oil (mineral and natural ester), and copper are shown. Aging was carried out in various experiments at 150 °C, 160 °C, 170 °C, and 180 °C with dry (initial values ≤ 0.5%) and moistened cellulose insulation (initial values 3–3.5%). Following insulating oil and paper, degradation markers were measured: the degree of polymerization, tensile strength, furan derivates, methanol/ethanol, acidity, interfacial tension, and dissipation factor. It was found that the aging of cellulose insulation in cycles was 1.5–1.6 times faster in comparison to continuous aging, due to the more pronounced effect of hydrolytic mechanism in cyclic aging owing to the produced and absorbed water. Furthermore, it was observed that the high initial water content in cellulose increases the aging rate two to three times more than in the dry experimental setup. The proposed aging test in cycles can be used to achieve faster aging and to compare the quality of different insulating papers. MDPI 2023-06-01 /pmc/articles/PMC10255721/ /pubmed/37299354 http://dx.doi.org/10.3390/polym15112556 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mihajlovic, Draginja
Vasovic, Valentina
Lukic, Jelena
Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose
title Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose
title_full Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose
title_fullStr Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose
title_full_unstemmed Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose
title_short Development of New Accelerated Aging Test for Comparison of the Quality of Different Insulating Papers Based on Cellulose
title_sort development of new accelerated aging test for comparison of the quality of different insulating papers based on cellulose
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10255721/
https://www.ncbi.nlm.nih.gov/pubmed/37299354
http://dx.doi.org/10.3390/polym15112556
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