Simulation and experimental analysis of dynamic thermal rise relaxation characteristics for dry-type distribution transformer
Author:
He Dong-sheng12ORCID, Jia Zhi-dong2, Yue Yong-gang2, Wang Ji-xiang3, Xiong Liu-rang1, Xia Shi4, Fu Jian-bing25, He Fa-wu1
Affiliation:
1. Guangzhou Railway Polytechnic , 511365 , Guangzhou , Guangdong Province , China 2. International Graduate School at Shenzhen, Tsinghua University , Nanshan 518055 , Shenzhen , Guangdong Province , China 3. State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University , Chongqing , China 4. Shenzhen Tiansu Metrology Testing Co., Ltd , Longgang 523000 , Shenzhen Province , China 5. China Electric Power Equipment and Technology Co, Ltd , Beijing 100052 , China
Abstract
Abstract
The temperature distribution characteristics of dry-type distribution transformers reflect their overall performance and quality. Distribution transformer daily load changes dramatically, its temperature fluctuates within a certain range. However, most of the research results on transformer temperature rise focus on the steady-state temperature characteristics of transformers, and lack of research related to dynamic temperature rise characteristics. This paper carries out a multi-physics coupling simulation and experimental verification of the dynamic temperature rise relaxation characteristics. The simulation uses the “electromagnetic-flow-thermal” multi-physics coupling analysis method to simulate the steady-state temperature rise characteristics and dynamic temperature rise relaxation characteristics of windings under different load rates. Then, this paper also explores the correlation between the dynamic temperature rise relaxation characteristics and load rate at the typical positions of high-voltage windings and low-voltage windings. The results show that the temperature rise of the winding shows the law of increasing the saturation index function with the increase of the load application time at any load rate. A quantitative characterization model of dynamic temperature rise relaxation behavior at different positions of transformer windings is constructed. It is found that the steady-state temperature rise value of different parts of the winding increases regularly as a power function with the increase of load rate, while the constant value of dynamic temperature rise relaxation time in different parts of the winding decreases as a power function with the increase of load rate. The verification results of the quantitative characterization model of dynamic temperature rise relaxation behavior show that the maximum error of the measured and theoretical steady-state temperature rise value is only 1.56 K, and the maximum error of the constant value of dynamic temperature rise relaxation time is only 0.082 h. These findings provide valuable insights into the performance and quality of dry-type distribution transformers, and can help improve their design and operation for better efficiency and safety.
Publisher
Walter de Gruyter GmbH
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