| 单电流产生的磁场的金属管屏蔽 |
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| 引用本文： | 徐霖,傅正财. 单电流产生的磁场的金属管屏蔽[J]. 高压电器, 2003, 39(1): 12-15 |
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| 作者姓名： | 徐霖 傅正财 |
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| 作者单位： | 上海交通大学电气工程系,上海,200030 |
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| 摘 要： | 在分析了对几种不同电流源产生的磁场进行屏蔽的机理的基础上,讨论了单电流产生的磁场的有效屏蔽方法。通过理论推导、边界元数值计算和试验验证表明,两端用低阻抗连接或者良好接地的金属管才能有效地屏蔽单电流产生的磁场,不接地或单端接地的金属管对于这种磁场没有屏蔽作用。
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| 关 键 词： | 磁场屏蔽 管状屏蔽 边界元法 涡流 |
| 文章编号： | 1001-1609(2003)01-0012-04 |
| 修稿时间： | 2002-09-09 |
SHIELDING EFFECTIVENESS OF METALLIC CYLINDRICAL TUBE FOR MAGNETIC FIELDS GENERATED BY UNIDIRECTIONAL ALTERNATIVE CURRENT |
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| XU Lin,FU Zheng-cai. SHIELDING EFFECTIVENESS OF METALLIC CYLINDRICAL TUBE FOR MAGNETIC FIELDS GENERATED BY UNIDIRECTIONAL ALTERNATIVE CURRENT[J]. High Voltage Apparatus, 2003, 39(1): 12-15 |
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| Authors: | XU Lin FU Zheng-cai |
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| Abstract: | This pa pe r presents the effective shielding design for magnetic fields generated by unidi rectional current based on the analysis of the shielding effectiveness of severa l kinds of current sources.Theoretical formulas and numerical computation softwa re based on the boundary element method are employed to find the effective shiel ding solution.It is shown that ungrounded cylindrical metallic tube has no shiel ding effectiveness for unidirectional current.Effective shielding can be reached by connecting the two ends of the tube with low impedance connector,or alternat ively,grounding the two ends.Experiments are also carried out,and the result s upports this conclusion. |
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| Keywords: | magnetic shielding cylindrical shell bounda ry element method eddy current |
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