Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics

Abstract To explore the aging assessment method of the oil–paper insulation in power transformers, the polarization and depolarization current (PDC) characteristics of oil–paper composite insulation samples are investigated under high applied voltage. Based on the asymmetry of polarization absorptio...

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Autores principales:	Yu Zhuang, Yonghong Wang, Meiying Wang, Xinlao Wei
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2022
Materias:	Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/df357b23fc4f4f71a23473c05c5103cb
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spelling	oai:doaj.org-article:df357b23fc4f4f71a23473c05c5103cb2021-12-01T10:55:37ZAging assessment method of oil–paper composite insulation based on repeated polarization current characteristics1751-88301751-882210.1049/smt2.12086https://doaj.org/article/df357b23fc4f4f71a23473c05c5103cb2022-01-01T00:00:00Zhttps://doi.org/10.1049/smt2.12086https://doaj.org/toc/1751-8822https://doaj.org/toc/1751-8830Abstract To explore the aging assessment method of the oil–paper insulation in power transformers, the polarization and depolarization current (PDC) characteristics of oil–paper composite insulation samples are investigated under high applied voltage. Based on the asymmetry of polarization absorption current and depolarization current and the polarity effect of insulation pressboard, the repeated polarization current test method is proposed. A novel aging characteristic parameter, which is the ratio of the normalized charge for the first polarization and the normalized charge for the second polarization, is extracted. The difference between the decay rates of the first polarization current and the second polarization current increases at first and then decreases with the polarization time, and decreases with increasing aging degree of the pressboard. The more serious the insulation aging is, the smaller the variation range of aging characteristic parameter with polarization time is, and the closer the value is to 1. With decrease in the DP, the maximum of aging characteristic parameter changes in a decreasing trend. The aging condition of the oil–paper composite insulation can be assessed by the repeated polarization current method and the relationship between the aging characteristic parameter and the polarization time.Yu ZhuangYonghong WangMeiying WangXinlao WeiWileyarticleElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIET Science, Measurement & Technology, Vol 16, Iss 1, Pp 59-68 (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Electrical engineering. Electronics. Nuclear engineering TK1-9971 Yu Zhuang Yonghong Wang Meiying Wang Xinlao Wei Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
description	Abstract To explore the aging assessment method of the oil–paper insulation in power transformers, the polarization and depolarization current (PDC) characteristics of oil–paper composite insulation samples are investigated under high applied voltage. Based on the asymmetry of polarization absorption current and depolarization current and the polarity effect of insulation pressboard, the repeated polarization current test method is proposed. A novel aging characteristic parameter, which is the ratio of the normalized charge for the first polarization and the normalized charge for the second polarization, is extracted. The difference between the decay rates of the first polarization current and the second polarization current increases at first and then decreases with the polarization time, and decreases with increasing aging degree of the pressboard. The more serious the insulation aging is, the smaller the variation range of aging characteristic parameter with polarization time is, and the closer the value is to 1. With decrease in the DP, the maximum of aging characteristic parameter changes in a decreasing trend. The aging condition of the oil–paper composite insulation can be assessed by the repeated polarization current method and the relationship between the aging characteristic parameter and the polarization time.
format	article
author	Yu Zhuang Yonghong Wang Meiying Wang Xinlao Wei
author_facet	Yu Zhuang Yonghong Wang Meiying Wang Xinlao Wei
author_sort	Yu Zhuang
title	Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
title_short	Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
title_full	Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
title_fullStr	Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
title_full_unstemmed	Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
title_sort	aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics
publisher	Wiley
publishDate	2022
url	https://doaj.org/article/df357b23fc4f4f71a23473c05c5103cb
work_keys_str_mv	AT yuzhuang agingassessmentmethodofoilpapercompositeinsulationbasedonrepeatedpolarizationcurrentcharacteristics AT yonghongwang agingassessmentmethodofoilpapercompositeinsulationbasedonrepeatedpolarizationcurrentcharacteristics AT meiyingwang agingassessmentmethodofoilpapercompositeinsulationbasedonrepeatedpolarizationcurrentcharacteristics AT xinlaowei agingassessmentmethodofoilpapercompositeinsulationbasedonrepeatedpolarizationcurrentcharacteristics
_version_	1718405264883843072

Aging assessment method of oil–paper composite insulation based on repeated polarization current characteristics

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