State-of-Art Review on Chemical Indicators for Monitoring the Aging Status of Oil-Immersed Transformer Paper Insulation

Enze Zhang (), Jiang Liu, Chaohai Zhang, Peijun Zheng, Yosuke Nakanishi and Thomas Wu
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Enze Zhang: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Jiang Liu: Global Center for Science and Engineering, Waseda University, Tokyo 1698555, Japan
Chaohai Zhang: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Peijun Zheng: Graduate School of Environment and Energy Engineering, Waseda University, Tokyo 1698555, Japan
Yosuke Nakanishi: Graduate School of Environment and Energy Engineering, Waseda University, Tokyo 1698555, Japan
Thomas Wu: School of Electrical Engineering, Guangxi University, Nanning 530004, China

Energies, 2023, vol. 16, issue 3, 1-31

Abstract: Chemical compounds dissolved in insulating oil, as indicators can excellently monitor the paper aging condition, which has attracted increasing interest in areas of transformer condition monitoring and fault diagnosis. Because of their outstanding features, such as good correlation with the degree of polymerization of cellulose paper and the aid of non-destructive online monitoring, chemical indicators have been effectively used for transformer condition assessment. In this study, a comprehensive, in-depth insight into the indicators of the aging of insulating paper from aging characteristics, physico-chemical characteristics, shortcomings of various compounds, generation pathways and mechanisms, and monitoring technologies are provided. It is expected that these chemical indicators can provide better guidance for the evaluation of paper insulation performance and transformer aging. In addition, the latest research progress, as well as current challenges and future prospects are also outlined. This study provides a theoretical basis and reference for chemical indicators in the fields of microscopic formation mechanism, diffusion equilibrium phenomenon, and insulation aging state assessment.

Keywords: chemical indicators; monitoring; aging status; power transformers; insulation paper (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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