Maintenance of natural ester transformers: case studies

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI:10.1109/CEIDP50766.2021.9705430

Erika Breda, L. Calcara, Matteo Banditelli, M. Pompili, Simone Sacco

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Abstract

In the last two decades, the number of applications of natural esters (NE) transformers is steeply growing, requiring also proper monitoring and maintenance of the quality of the insulating liquid. Nevertheless, reference values and alert limits are not yet completely available with reference to different classes of the transformers. Some helps may be sorted out from the recent publication (2021-01) of the IEC 62975 "Natural esters - Guidelines for maintenance and use in electrical equipment" which contains useful additional information for the operators in NE transformers.To overcome this situation, there is an effort to look for similarities with traditional transformers insulated with mineral oil (MO) for which a great amount of information on chemical-physical analysis are already available. In the present paper, case studies of some Natural Ester (NE) transformers maintenance have been presented and discussed. The acquired data will be also useful with the aim of adjusting the Health Index evaluation in order to guarantee support for maintenance decisions of the operators in this sector.

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天然酯变压器的维护:案例研究

在过去的二十年中，天然酯(NE)变压器的应用数量急剧增长，也需要对绝缘液体的质量进行适当的监测和维护。然而，对于不同类别的变压器，参考值和警戒限值尚未完全可用。一些帮助可以从最近出版的IEC 62975(2021-01)“天然酯-电气设备维护和使用指南”中整理出来，其中包含对NE变压器操作人员有用的附加信息。为了克服这种情况，人们努力寻找与矿物油(MO)绝缘的传统变压器的相似之处，因为矿物油(MO)已经提供了大量的化学物理分析信息。本文介绍和讨论了一些天然酯(NE)变压器的维修实例。获得的数据也将有助于调整健康指数评估，以确保支持该部门运营商的维护决策。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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