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

Ya Ping Du, T. C. Cheng, A. S. Farag

Research output: Journal article publicationJournal articleAcademic researchpeer-review

101 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)450-459
Number of pages10
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number3
Publication statusPublished - 1 Dec 1996
Externally publishedYes


  • Electromagnetic field
  • Magnetic field measurement
  • Magnetic field shielding

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications


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