Magnetic Shielding Performance of Thin Metal Sheets Near Power Cables

In this study, wrapping conductors with thin magnetic materials is proposed as a magnetic shielding method. The 0.1-mm-thick metal sheets of mu-metal, grain-oriented electrical steel, and nonoriented electrical steel were prepared from commercial alloy sheets through cold rolling and followed high t...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2010-02, Vol.46 (2), p.682-685
Main Authors: Kim, Sang-Beom, Soh, Joon-Young, Shin, Koo-Yong, Jeong, Jin-Hye, Myung, Sung-Ho
Format: Article
Language:English
Subjects:
Alloy steels
Conducting materials
Current
Electric current
Electrical steels
Electromagnetism
Extremely low frequency (ELF)
Iron alloys
Magnetic fields
Magnetic materials
Magnetic shielding
Magnetism
Mathematical analysis
Metal sheets
power cable
Power cables
Shielding
shielding factor
Silicon
Steel
Temperature
Wrapping
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Summary:In this study, wrapping conductors with thin magnetic materials is proposed as a magnetic shielding method. The 0.1-mm-thick metal sheets of mu-metal, grain-oriented electrical steel, and nonoriented electrical steel were prepared from commercial alloy sheets through cold rolling and followed high temperature annealing. For magnetic fields generated by three-phase electric currents, mu-metal was the best in shielding performance when magnetic field at the shield point is about 90 ¿ T, yielding an excellent shielding factor lower than 0.1 in the vicinity of the shield. Above 490 ¿ T, however, silicon steels were better than mu-metal. Double-layer shielding with grain-oriented silicon steel (inner) and mu-metal (outer) resulted in an excellent shielding factor up to 490 ¿T. These results are due to change in hierarchy of magnetic permeabilities of the materials with increasing magnetic field strength. For magnetic fields by single-phase electric current, on the other hand, a magnetic shield rather increased magnetic field or had no practical effect on shielding performance. This result is explained by superposition of original field vectors and secondary field vectors created by eddy currents within the materials.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2032140