| EFFECTIVE SHIELDING OF UNIDIRECTIONAL CURRENT GENERATED MAGNETIC FIELDS |
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| 作者姓名： | 徐霖 傅正财 杜亚平 |
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| 作者单位： | 1. Dept. of Electrical Eng.，Shanghai Jiaotong Univ.，Shanghai 200030，China; 2. Dept. of Building Services Eng.，Hong Kong Polytechnic Univ. |
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| 摘 要： | Introduction Environmentalelectromagnetic fields are ofin-creasing concern.Passive shielding is often em-ployed to reduce magnetic fields. Cylindricalshielding geometry is widely employed in powerin-dustry such as protective pipes,cable ducts andlightning down- conductors. Although shielding ef-fects of such conducting shells on magnetic fieldshave been recognized in recent decades,most ofthe studies have been devoted to the case of“dipole” ( opposite equal currents) sources or bal-anced…
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EFFECTIVE SHIELDING OF UNIDIRECTIONAL CURRENT GENERATED MAGNETIC FIELDS |
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| XU Lin ,FU Zheng cai ,DU Ya ping.EFFECTIVE SHIELDING OF UNIDIRECTIONAL CURRENT GENERATED MAGNETIC FIELDS[J].Journal of Shanghai Jiaotong university,2002,7(2):171-174. |
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| Authors: | XU Lin FU Zheng cai DU Ya ping |
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| Institution: | 1. Dept. of Electrical Eng., Shanghai Jiaotong Univ., Shanghai 200030, China
2. Dept. of Building Services Eng., Hong Kong Polytechnic Univ. |
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| Abstract: | This paper presented an effective shielding design of magnetic fields generated by unidirectional current. Theoretical formulas and numerical computation software based on boundary element method (BEM) are employed to evaluate the shielding effectiveness (SE) of cylindrical shell. It is shown that ungrounded or one end grounded metal shell is ineffective for such magnetic fields. SE can be obtained by connecting the two ends of the conducting shell with low impedance connector, or alternatively, grounding the two ends. The experimental results also support these conclusions. |
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| Keywords: | magnetic shielding cylindrical shell boundary element method eddy current |
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