Effect of Magnetic Shunts on Shell-Type Transformers Characteristics

Bronisław Tomczuk () and Dawid Weber
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Bronisław Tomczuk: Department of Electrical Engineering & Mechatronics, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland
Dawid Weber: Technology Center, Hitachi Energy, Aleksandrowska 67/93, 91-205 Lodz, Poland

Energies, 2023, vol. 16, issue 19, 1-18

Abstract: A three-dimensional analysis of the leakage magnetic field in a transformer with beveled edges in a magnetic shunt is described. This paper contains a mathematical description of the finite element method used in performing numerical calculations. Formulas allowing to determine the differential and integral parameters of the magnetic field were presented. Magnetic flux density distributions and the points with high values were determined in the shell-type core and movable shunt sub-areas. For different positions of the magnetic shunt, the short-circuit transformer reactance was calculated as the integral parameter of the above-mentioned magnetic field analysis. Their amounts for the extreme positions of the shunt were given, as well. The movable magnetic shunt geometry impact on the short-circuit current value is given. In order to validate the calculation results, the research included some point measurements of magnetic flux density vectors and the winding reactances as well, and good compliance with the simulation data has been obtained. Thus, this analysis can also be applied to other objects with movable shunts in their magnetic systems.

Keywords: shell-type core transformer; high leakage reactance; magnetic shunt with beveled edges; 3D magnetic field; finite element method; short-circuit current regulation; verification by measurements; physical model testing (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: 2023
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