An approach on lifetime estimation of distribution transformers based on degree of polymerization

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An approach on lifetime estimation of distribution transformers based on degree of polymerization. / Ariannik, Mohamadreza; Razi-Kazemi, Ali A.; Lehtonen, Matti.

In: Reliability Engineering and System Safety, Vol. 198, 106881, 01.06.2020.

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@article{1acbf82f737c483b8cd3ca64b5fe4df5,
title = "An approach on lifetime estimation of distribution transformers based on degree of polymerization",
abstract = "Lifetime of oil-immersed transformers is highly dependent on condition of paper insulation. This contribution is aimed to quantify the deterioration and ageing process of the paper insulation of distribution transformers based on degree of polymerization (DP). The proposed approach involves real operating conditions of a transformer such as variable ambient temperature, load factor, and moisture content of the paper insulation through calculation of hot-spot temperature to estimate remaining lifetime of the transformers. The results indicate that a DP profile obtained based on actual conditions is completely different to that usually discussed in other researches under completely constant conditions. Consequently, the proposed dynamic DP model could predict lifetime of the transformers more precisely based on real-time measurable quantities. In addition to the remnant lifetime estimation, the proposed dynamic DP profile is utilized to suggest the optimum time for implementing reductions in moisture content of the paper insulation through three scenarios regarding the practical limitations. Finally, reliability of the transformer is evaluated based on statistical data.",
keywords = "Degree of polymerization (DP), Lifetime estimation, Moisture content, Moisture reduction, Paper insulation",
author = "Mohamadreza Ariannik and Razi-Kazemi, {Ali A.} and Matti Lehtonen",
year = "2020",
month = "6",
day = "1",
doi = "10.1016/j.ress.2020.106881",
language = "English",
volume = "198",
journal = "Reliability Engineering and System Safety",
issn = "0951-8320",

}

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TY - JOUR

T1 - An approach on lifetime estimation of distribution transformers based on degree of polymerization

AU - Ariannik, Mohamadreza

AU - Razi-Kazemi, Ali A.

AU - Lehtonen, Matti

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Lifetime of oil-immersed transformers is highly dependent on condition of paper insulation. This contribution is aimed to quantify the deterioration and ageing process of the paper insulation of distribution transformers based on degree of polymerization (DP). The proposed approach involves real operating conditions of a transformer such as variable ambient temperature, load factor, and moisture content of the paper insulation through calculation of hot-spot temperature to estimate remaining lifetime of the transformers. The results indicate that a DP profile obtained based on actual conditions is completely different to that usually discussed in other researches under completely constant conditions. Consequently, the proposed dynamic DP model could predict lifetime of the transformers more precisely based on real-time measurable quantities. In addition to the remnant lifetime estimation, the proposed dynamic DP profile is utilized to suggest the optimum time for implementing reductions in moisture content of the paper insulation through three scenarios regarding the practical limitations. Finally, reliability of the transformer is evaluated based on statistical data.

AB - Lifetime of oil-immersed transformers is highly dependent on condition of paper insulation. This contribution is aimed to quantify the deterioration and ageing process of the paper insulation of distribution transformers based on degree of polymerization (DP). The proposed approach involves real operating conditions of a transformer such as variable ambient temperature, load factor, and moisture content of the paper insulation through calculation of hot-spot temperature to estimate remaining lifetime of the transformers. The results indicate that a DP profile obtained based on actual conditions is completely different to that usually discussed in other researches under completely constant conditions. Consequently, the proposed dynamic DP model could predict lifetime of the transformers more precisely based on real-time measurable quantities. In addition to the remnant lifetime estimation, the proposed dynamic DP profile is utilized to suggest the optimum time for implementing reductions in moisture content of the paper insulation through three scenarios regarding the practical limitations. Finally, reliability of the transformer is evaluated based on statistical data.

KW - Degree of polymerization (DP)

KW - Lifetime estimation

KW - Moisture content

KW - Moisture reduction

KW - Paper insulation

UR - http://www.scopus.com/inward/record.url?scp=85080094743&partnerID=8YFLogxK

U2 - 10.1016/j.ress.2020.106881

DO - 10.1016/j.ress.2020.106881

M3 - Article

AN - SCOPUS:85080094743

VL - 198

JO - Reliability Engineering and System Safety

JF - Reliability Engineering and System Safety

SN - 0951-8320

M1 - 106881

ER -

ID: 41496734