本文探討穿越市區中之架空與地下管路電力線電力頻率磁場分佈的情形，研討可行的磁場抑低技術，以降低周圍的磁場值。首先應用有限元素法套裝軟體(FLUX3D)建立架空線路模擬架構，再分析鋁板、矽鋼片、不銹鋼、Amumetal對於磁場之屏蔽效應，針對大樓選擇適當的材質，達到降低磁場的效果。本論文也探討地下管路內電纜相序排列對降低環境磁場的作用，考慮管路形式、電流方向及舖設高度，增加磁場源距離等情形。由研究結果發現，對於管路相序排列作適當的安排，確實能將磁場抑低，因此於建設地下管路前，利用此方法妥善規劃，不僅耗費成本最少，且能達成很好的抑低磁場成效。

The purpose of this thesis is to study the distribution characteristics of power-frequency magnetic field from overhead and underground tube power line when transfer the electric power through urban area. It is hoped to used in magnetic field analysis and mitigation method selection, and to obtain the distribution of magnetic field. At first, the finite element based simulation package, FLUX3D, can be used to establish the simulation model of overhead power line and to evaluate the magnetic field shielding effect of aluminum plate, silicon steel, stainless steel and Amumetal. It wants to obtain the effect in reduction of magnetic field, to choose the adequate material for the shielding, to reduce magnetic field flux density.
In evaluating the magnetic field conditions around the underground tube power line, the tube types, direction of current, and the depth of cables are studied. From the study results, the better arrangement of cables can reduce magnetic field. Therefore, it really has the effect on reduction of magnetic-field and should be a low cost method before the construction of the underground tube power line.

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