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Open AccessArticle
Study on Thermal Characteristics of Winding under Inter-Turn Fault of Oil-Immersed Transformer
by
Yuefeng Hao
Yuefeng Hao 1,
Zhanlong Zhang
Zhanlong Zhang 1,*
,
Jiayi Xiao
Jiayi Xiao 1,2,
Hui Zhao
Hui Zhao 1,3,
Yu Yang
Yu Yang 1 and
Zijian Dong
Zijian Dong 1
1
School of Electrical Engineering, Chongqing University, Chongqing 400044, China
2
State Grid Hunan Extra High Voltage Substation Company, Changsha 410005, China
3
Central Southern China Electric Power Design Institute, Wuhan 430071, China
*
Author to whom correspondence should be addressed.
Electronics 2024, 13(14), 2869; https://doi.org/10.3390/electronics13142869 (registering DOI)
Submission received: 18 June 2024
/
Revised: 12 July 2024
/
Accepted: 15 July 2024
/
Published: 21 July 2024
Abstract
The inter-turn fault is a common fault of oil-immersed transformers. Due to the deterioration of inter-turn insulation, its resistance decreases, which leads to an increase in the winding coil current and loss, causing the winding temperature to rise. Therefore, analyzing the electrothermal characteristics of inter-turn short circuit faults in oil-immersed transformers can provide a theoretical basis for the diagnosis of inter-turn faults in transformers. This paper studies the equivalent circuit under inter-turn faults and establishes a field–circuit coupling model to calculate the current characteristics under different inter-turn short circuit faults of transformers. The distribution of coil losses under faults is calculated as thermal source excitations, and a thermal–fluid-coupled calculation model for oil-immersed transformers is established. After the experimental verification, it is found that both the errors between the winding and tank surface temperatures do not exceed the acceptable limits, validating the effectiveness of this model. Using this model to calculate the temperature distribution for various inter-turn short circuit faults in transformers reveals their hot-spot characteristics. The results indicate that under inter-turn fault conditions, the temperature at faulty turns will gradually increase towards a limit, eventually leading to coil damage. This research provides theoretical support for enhancing transformer detection and diagnostic capabilities.
Share and Cite
MDPI and ACS Style
Hao, Y.; Zhang, Z.; Xiao, J.; Zhao, H.; Yang, Y.; Dong, Z.
Study on Thermal Characteristics of Winding under Inter-Turn Fault of Oil-Immersed Transformer. Electronics 2024, 13, 2869.
https://doi.org/10.3390/electronics13142869
AMA Style
Hao Y, Zhang Z, Xiao J, Zhao H, Yang Y, Dong Z.
Study on Thermal Characteristics of Winding under Inter-Turn Fault of Oil-Immersed Transformer. Electronics. 2024; 13(14):2869.
https://doi.org/10.3390/electronics13142869
Chicago/Turabian Style
Hao, Yuefeng, Zhanlong Zhang, Jiayi Xiao, Hui Zhao, Yu Yang, and Zijian Dong.
2024. "Study on Thermal Characteristics of Winding under Inter-Turn Fault of Oil-Immersed Transformer" Electronics 13, no. 14: 2869.
https://doi.org/10.3390/electronics13142869
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