A Boundary Integral Formulation on Unstructured Dual Grids for Eddy-Current Analysis in Thin Shields

Dipt. di Ingegneria Elettrica, Padova Univ.
IEEE Transactions on Magnetics (Impact Factor: 1.42). 05/2007; DOI: 10.1109/TMAG.2006.890948
Source: IEEE Xplore

ABSTRACT A 3-D boundary integral method (3-D BIM) capable of analyzing eddy currents in thin shields is presented. This novel approach is formulated in terms of loop currents in order to implicitly fulfill the div-free condition for quasi-magnetostatic problems. Using nonorthogonal dual grids unknowns are defined on nodes, resulting in a very efficient formulation with limited memory requirements. The proposed method is tested on an axisymmetric model showing a good agreement with the analytical solution. 3-D BIM is then applied to analyze a real case of low-frequency magnetic shielding

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    ABSTRACT: Export Date: 19 July 2012, Source: Scopus, CODEN: CODUD, doi: 10.1108/03321640810847742, Language of Original Document: English, Correspondence Address: Moro, F.; Dipartimento di Ingegneria Elettrica, Università di Padova, Padova, Italy; email:, References: Alotto, P., Guarnieri, M., Moro, F., A boundary integral formulation on unstructured dual grids for eddy current analysis in thin shields (2007) IEEE Trans. on Magnetics, 43 (4), pp. 1173-6;
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    ABSTRACT: A three-dimensional integral procedure based on the cell method and suitable for simulating non-magnetic shields has been proposed recently. Its validation against systematic measurements is here presented. A good agreement between computed and measured magnetic field RMS values confirms that the proposed integral procedure can be used confidently in designing shielding apparatuses for MV/LV substations.
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    ABSTRACT: The design of a magnetic shielding arrangement for an indoor substation is considered. The aim of the intervention is to reduce the magnetic field intensity inside a room above the substation. Stray fields are mitigated by using metallic screens and by rearranging LV cables in order to limit intervention costs. A three-dimensional electromagnetic analysis of stray fields is performed by means of an original integral code, whereas a two-dimensional FEM software is used for assessing the shielding performance locally, in proximity of LV cables. Simulations show that the highest field attenuation levels are attained when phases of conductors and transformers are arranged in optimised configurations. The developed procedure is then applied to design a magnetic shield for a MV/LV substation. It is shown that measured and computed field r.m.s. values of the magnetic flux density are in good agreement.
    Universities Power Engineering Conference, 2007. UPEC 2007. 42nd International; 10/2007

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