Investigation of Shielding Effects of High Conductivity of High Permeability Materials on 60Hz ELF Magnetic Fields

60Hz ELF 자계에 대한 고 도전율 및 고 투자율 재료의 차폐효과 분석

  • 송기현 (순천향대학 정보기술공학부) ;
  • 명성호 (한국전기연구원) ;
  • 민석원 (순천향대학 정보기술공학부)
  • Published : 2005.04.01

Abstract

Shielding methods on ELF(Extremely Low Frequency) magnetic fields may include the use of induced currents, modification of magnetic field flux patterns using high permeability and/or high conductivity materials, and others. The magnetic shielding properties of enclosures can be utilized to reduce the magnetic field of current carrying conductors. In this paper, to get a more practical understanding of shielding phenomena, we have investigated the magnetic field reduction by means of 3 dimensional numerical analysis and experiments. We found copper could reduce flux density more then permalloy in both cases of box shield and cylindrical shield. Iron under l0$\mu$T of 1 phase could reduce flux density about $20\%$ more than silicon steel, but both of them under 50$\mu$T has a similar reduction rate of $10\%$. The 3 phase horizontal model gave the highest reduction rate and the 1mm thickness iron under 10$\mu$T of 3 phase lines did lowest.

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References

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