Different AC magnetic field shielding procedures

Different AC magnetic field shielding procedures
Teodora G. Gavrilov, Karolina K. Kasas-Lazetic, Miroslav A. Prsa


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In this paper, the analysis of magnetic field distribution of shielded copper conductor with the current of 100 A RMS is presented. The impact of various shielding materials (copper, aluminium and zinc-coated iron tin) and the combinations of these materials on magnetic field distribution is investigated. The main goal of the calculations was to examine the impact that different magnetic and non-magnetic materials, placed around the wire, have on the magnetic field distribution outside the shield. The investigated materials have different conductivity values and the zinc-coated tin has a different permeability value as well. The magnetic field source defines the shielding screen shape and this shape was chosen to enable the simple model construction in order to verify calculated results by measurements. The base of the investigated screen shapes is a PVC tube with selected radius, available on market. The shielding tubes are positioned inside or/and outside the PVC tube. The calculation results are presented in the form of tables and diagrams of the magnetic flux density magnitude in the plane perpendicular to the system’s axis. The calculation results show that the lowest magnetic flux density vector magnitude outside the shield is achieved with the combination of copper/zinc-coated iron tin. The numerical calculations were performed in COMSOL Multiphysics program package on a 2D model.


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Gavrilov T., Kasas-Lazetic K., Prsa M. Different AC magnetic field shielding procedures. Electrotechnica & Electronica (Е+Е), Vol. 56 (5-8), 2021, pp.68-73, ISSN: 0861-4717 (Print), 2603-5421 (Online)