Residual Flux Measurement of Power Transformer Based on Transient Current Difference

Power transformer is the main part of the power grid. After some tests and operations of transformers, a certain residual flux density ( B_{r} ) is left in the iron core due to the ferromagnetic material hysteresis phenomenon. When the transformer is switched on with no load, B_{r} will lead to in...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-02, Vol.58 (2), p.1-5
Main Authors: Wu, Shipu, Ren, Yuzhan, Wang, Youhua, Huo, Cailing, Liu, Chengcheng
Format: Article
Language:English
Subjects:
Circuit faults
Circuits
Current measurement
Empirical analysis
Extremum values
Ferromagnetic materials
Finite element method
Finite element method (FEM)
Flux density
Inrush current
Iron
Magnetic circuits
Magnetism
magnetizing inrush current
Mathematical analysis
Measurement methods
Oil insulation
Parameters
Power transformers
residual flux density
transformer
Transformer cores
Transformers
Transient analysis
Transient current
transient current difference
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Summary:Power transformer is the main part of the power grid. After some tests and operations of transformers, a certain residual flux density ( B_{r} ) is left in the iron core due to the ferromagnetic material hysteresis phenomenon. When the transformer is switched on with no load, B_{r} will lead to inrush current. Therefore, research on measuring B_{r} is of great significance for transformer protection. In this article, a B_{r} measurement method based on applied dc voltage is proposed. First, combined with the magnetic circuit and transient circuit analysis, the relationship between B_{r} and the extremum value of the transient current difference is obtained. Then, the finite element method (FEM) is used to calculate the transient current under different B_{r} and test circuit parameters; the suitable test circuit parameters will be determined, and then the empirical formula for calculating B_{r} is obtained. Finally, the experimental results verify the correctness of the simulation analysis.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3082699