Innovative Transformer Life Assessment Considering Moisture and Oil Circulation

Zhengping Liang (), Yan Fang, Hao Cheng, Yongbin Sun, Bo Li, Kai Li, Wenxuan Zhao, Zhongxu Sun and Yiyi Zhang ()
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Zhengping Liang: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Yan Fang: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Hao Cheng: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Yongbin Sun: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Bo Li: Guangxi Power Transmission and Distribution Network Lightning Protection Engineering Technology Research Center, Guangxi University, Nanning 530004, China
Kai Li: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Wenxuan Zhao: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Zhongxu Sun: North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100120, China
Yiyi Zhang: Guangxi Power Transmission and Distribution Network Lightning Protection Engineering Technology Research Center, Guangxi University, Nanning 530004, China

Energies, 2024, vol. 17, issue 2, 1-21

Abstract: Power transformers are one of the most expensive and important equipment in the power system. Significant differences exist in the insulation lifespan of transformers that have been in operation for more than 20 years, and using identical maintenance or scrapping methods may result in significant economic losses. However, most existing transformer life assessment methods only consider the impact of moisture content on the life decay rate without considering the impact of oil circulation cooling modes, which leads to some evaluation errors. In this study, we established a new transformer life assessment method that considers the influence of moisture content and oil circulation cooling modes, which is more accurate than most life assessment methods. Then, the proposed life evaluation method was validated on the on-site transformers, demonstrating its accuracy and effectiveness. The novelty of this study is that it establishes a new on-site transformer life assessment method that considers the comprehensive effect of moisture content and oil circulation cooling mode, which helps to evaluate the remaining lifespan of power transformers more accurately and thus extends the transformer lifespan systematically.

Keywords: life evaluation; oil-paper insulation; power transformer; moisture; oil circulation (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: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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