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

Song Ki-Hyun (순천향대학 정보기술공학부)
Myung Sung-Ho (한국전기연구원)
Min Suk-Won (순천향대학 정보기술공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers C / v.54, no.4, 2005 , pp. 166-171 More about this Journal
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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  • Reference
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