Residual Flux Measurement of Single-phase Transformers based on Equivalent Resistance

Authors

  • Qingkun Wang 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China
  • Yuzhan Ren 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China
  • Youhua Wang 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China
  • Chengcheng Liu 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China
  • Shipu Wu 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China

DOI:

https://doi.org/10.13052/2023.ACES.J.380710

Keywords:

Equivalent resistance, field-coupled equivalent circuit, residual flux measurement, transformer

Abstract

Due to the presence of transformer residual flux, the magnetic flux of the core rapidly reaches saturation, thus causing an inrush current when the no-load transformer is directly connected to the grid, which affects the safe operation of the grid. Therefore, it is necessary to study the residual flux in the core to reduce the inrush current. However, the residual flux estimation has a large error. In this paper, a method is proposed to measure the residual flux of the transformer core by solving equivalent resistance and determining the direction of residual flux by the difference between the forward and reverse transient currents. In addition, the relationship between residual flux and equivalent resistance is established, and the empirical formula is obtained for calculating the residual flux. To evaluate the effectiveness of the proposed method, the residual flux of the square core is measured on the constructed experimental platform. Compared with the experimental results, the relative error of the residual flux of the core calculated by the proposed method is within 6%, which has higher accuracy and provides a reference for residual flux estimation.

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Author Biographies

Qingkun Wang, 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China

Qingkun Wang was born in Jining, Shandong, China, in 1998. He received a B.E. degree in electrical engineering from Binzhou University, Binzhou, China, in 2021. He is currently pursuing an M.E. degree in electrical engineering at the Hebei University of Technology, Tianjin, China. His current research interest is the measurement of the residual flux of the power transformercore.

Yuzhan Ren, 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China

Yuzhan Ren was born in Anhui, China, in 1997. He received a B.E. degree in electrical engineering from Northeast Electric Power University, Jilin, China, in 2019. He is currently pursuing a Ph.D. degree in electrical engineering from the Hebei University of Technology, Tianjin, China. His current research interests include measurement of the residual flux of power transformer cores and research on the inrush current of large power transformers.

Youhua Wang, 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China

Youhua Wang was born in Jiujiang, Jiangxi, China, in 1964. He received a B.E. degree from Xian Jiaotong University, Xian, China, in 1987, an M.E. degree from the Hebei University of Technology, Tianjin, China, in 1990, and a Ph.D. from Fuzhou University, Fuzhou, China, in 1994, all in electrical apparatus. He is currently a professor at the College of Electrical Engineering. His current research interests include measurement and modeling of properties of magnetic materials, numerical analysis of the electromagnetic field, and electromagnetic device design, analysis, and optimization.

Chengcheng Liu, 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China

Chengcheng Liu was born in Jiangsu, China, in 1988. He received a B.E. degree in automation engineering from Yangzhou University, Yangzhou, China, in 2010, and a Ph.D. degree in electrical engineering from the Hebei University of Technology, Tianjin, China, in 2016. He was a joint Ph.D. student supported by the Chinese scholarship council with the University of Technology, Sydney, NSW, Australia. He is currently an IEEE member and an associate professor at the Hebei University of Technology. His research interests include the design, analysis, control, and optimization of electromagnetic devices.

Shipu Wu, 1) State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology, Tianjin, 300130, China 2) Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology, Tianjin, 300130, China

Shipu Wu was born in Shijiazhuang, Hebei, China, in 1995. He received a B.E. degree in electrical engineering from the Hebei University of Technology, Tianjin, China, in 2017. He is currently pursuing a Ph.D. degree in electrical engineering at the Hebei University of Technology, Tianjin, China. His current research interests include measurement of the residual flux of power transformer cores and research on the inrush current of large power transformers.

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Published

2023-12-18

How to Cite

[1]
Q. . Wang, Y. . Ren, Y. . Wang, C. . Liu, and S. . Wu, “Residual Flux Measurement of Single-phase Transformers based on Equivalent Resistance”, ACES Journal, vol. 38, no. 07, pp. 539–548, Dec. 2023.

Issue

2023: Vol 38 Iss 7

Section

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