Some 2D–3D aspects of shielding of longitudinal sources of extremely low frequency magnetic fields

Ener Salinas (), Marina Rezinkina () and Juan Atalaya ()
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Ener Salinas: London South Bank University
Marina Rezinkina: The Ukrainian National Academy of Sciences
Juan Atalaya: Chalmers University of Technology

Environment Systems and Decisions, 2009, vol. 29, issue 2, 141-146

Abstract: Abstract Typical sources of extremely low frequency magnetic fields include components of the power network and, as an extension, AC railway powering. The majority of these sources have longitudinal shapes. There is sometimes the need to reduce these fields in specific areas of interest. In this article, practical aspects are studied of shielding design when this type of source is involved. The focus is on design features not often treated in the shielding literature. One aspect relates to the differences between 2D and 3D simulations and experimental validation for a relatively long system of conductor and shield; as an example, the screening of the magnetic field of a railway system is presented. Another aspect relates to issues that arise when edge effects become relevant for actual systems. It is established that shielding factors are considerably improved when shielding of the edges is properly taken into account. The presence of gaps or loose contacts that are often responsible for low shielding efficiency is also studied. Experimental tests show that overlapping shields or the use of conductive patches significantly improves shielding efficiency. A last aspect is related to cost-effectiveness of shielding designs; in this case, numerical computations are used for benchmarking shielding properties for long busbars in secondary substations.

Keywords: Shielding; Extremely low magnetic fields; Finite element method; AC powered trains; Busbars (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1007/s10669-008-9206-0

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