Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

Chen Wei, Xianqiang Li, Ming Yang, Zhiyuan Ma and Hui Hou
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Chen Wei: School of Automation, Wuhan University of Technology, Wuhan 430070, China
Xianqiang Li: School of Automation, Wuhan University of Technology, Wuhan 430070, China
Ming Yang: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Zhiyuan Ma: School of Automation, Wuhan University of Technology, Wuhan 430070, China
Hui Hou: School of Automation, Wuhan University of Technology, Wuhan 430070, China

Energies, 2019, vol. 12, issue 24, 1-14

Abstract: The remanence (residual flux) in the core of power transformers needs to be determined in advance to eliminate the inrush current during the process of re-energization. In this paper, a novel method is proposed to determine the residual flux based on the relationship between residual flux and the measured magnetizing inductance. The paper shows physical, numerical, and analytical explanations on the phenomenon that the magnetizing inductance decreases with the increase of residual flux under low excitation. Numerical simulations are performed by EMTP (Electro-Magnetic Transient Program) on a 1 kVA power transformer under different amounts of residual flux. The inductance–remanence curves are nearly the same when testing current changes. Laboratory experiments conducted on the same transformer are in line with the numerical simulations. Furthermore, numerical simulation results on a 240 MVA are reported to demonstrate the effectiveness of the proposed method.

Keywords: magnetizing inductance; power transformer; residual flux (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: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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