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Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements

1
School of Automation, Wuhan University of Technology, Wuhan 430070, China
2
School of Electrical Engineering, Chongqing University, Chongqing 400044, China
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Author to whom correspondence should be addressed.
Energies 2019, 12(24), 4616; https://doi.org/10.3390/en12244616
Received: 16 October 2019 / Revised: 29 November 2019 / Accepted: 2 December 2019 / Published: 5 December 2019
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. View Full-Text
Keywords: magnetizing inductance; power transformer; residual flux magnetizing inductance; power transformer; residual flux
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MDPI and ACS Style

Wei, C.; Li, X.; Yang, M.; Ma, Z.; Hou, H. Novel Remanence Determination for Power Transformers Based on Magnetizing Inductance Measurements. Energies 2019, 12, 4616.

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