Principles of power-frequency magnetic field shielding with flat sheets in a source of long conductors

This paper presents a theoretical analysis of a two dimensional (2-D) model of power-frequency magnetic field shielding. It consists of multiple linear and conducting layers, as well as multiple current-carrying conductors. Explicit expressions for magnetic field and power loss are deduced by solvin...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 1996-08, Vol.38 (3), p.450-459
Main Authors: Yaping Du, Cheng, T.C., Farag, A.S.
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Closed-form solution
Conducting materials
Conductivity
Electromagnetic compatibility
Equations
Exact sciences and technology
Information, signal and communications theory
Magnetic analysis
Magnetic materials
Magnetic shielding
Permeability
Telecommunications and information theory
Two dimensional displays
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Summary:This paper presents a theoretical analysis of a two dimensional (2-D) model of power-frequency magnetic field shielding. It consists of multiple linear and conducting layers, as well as multiple current-carrying conductors. Explicit expressions for magnetic field and power loss are deduced by solving diffusion equations using the method of variable separation. They are verified by experimental results of magnetic field shielding with both aluminum and magnetic material shields. Shielding principles taking into account geometric and material parameters (e.g., relative permeability, conductivity, thickness, etc.) are presented based on the simplification of closed-form expressions. Those general shielding principles are applicable when the shield is sufficiently large. The derived shielding principles are used to address practical design issues of power-frequency magnetic field shielding. Conclusions regarding material selection, location, and current circulation are obtained. They can be applied in practical shielding design if sources are lines, bus bars, cables, or any other long current-carrying conductors in power systems.
ISSN:0018-9375
1558-187X
DOI:10.1109/15.536075