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Regular Paper | Open Access

Development of Mixed Insulation Oil as Alternative Liquid Dielectric: A Review

Jian Hao( ), Jingwen Zhang, Wenyu Ye, Ruijing Liao, Lijun Yang
State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
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Abstract

Use of traditional mineral oil (MO) as a liquid insulation in transformers has spanned more than 130 years. However, MO has poor heat resistance, a low ignition point, and is a non-renewable resource, which does not meet development requirements for high-performance and environmentally friendly insulation oil. Consequently, researchers have explored alternatives such as natural ester (NE) and synthetic ester (SE) oils, as well as mixed insulation oils. Mixed insulating oil is a blend of diverse insulating oil types, with optimal performance achieved by adjusting proportions of base oils. This article summarizes the innovative achievements and development of mixed insulation oil in terms of development of mixed ratio, basic physical chemical properties, electrical properties, thermal stability, and application including operation and maintenance technology. Through these efforts, this article aims to provide recommendations for future development of mixed insulating oils to advance liquid dielectric research based on enhancement mechanisms.

Keywords

Environmentally friendly insulation oilester oilshigh-performancemineral oilmixed insulation oils

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 3,
May 2024
Pages 1242-1258
DOI: 10.17775/CSEEJPES.2023.05960
Cite this article:
Hao J, Zhang J, Ye W, et al. Development of Mixed Insulation Oil as Alternative Liquid Dielectric: A Review. CSEE Journal of Power and Energy Systems, 2024, 10(3): 1242-1258. https://doi.org/10.17775/CSEEJPES.2023.05960

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Received: 16 July 2023
Revised: 08 October 2023
Accepted: 08 December 2023
Published: 28 December 2023
© 2023 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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