本論文探討電力電纜相序排列方式對磁場的影響，與可行降低方法。首先運用畢歐沙瓦定律(Biot savart’s law)，推導各種排列時，磁場分佈的公式。如將電纜線集中擺設並做適當的相序排列，能使三相電流源產生的磁場能夠相互抵消，以降低空間磁場。接著考慮電纜擺設方式的不同所產生的磁場特性，與屏蔽材料間的關係，探討導電性與導磁性金屬板運用之場合，達成更有效率的屏蔽效果。由研究結果顯示，適當的電纜相序排列方式，確實可達到降低磁場的效果，且各類金屬板對於不同分佈特性的磁場，會產生不同的屏蔽效果。因此在屏蔽前必須充分掌握磁場分佈特性，運用適當的金屬做為屏蔽材料，將可獲得較佳的屏蔽效果。

In this thesis, it is to study the effects of space arrangement of power cables on the distribution of the magnetic field and the reduction methods. At first, the Biot Savart’s law is applied to get the distribution formula of magnetic field according to the arrangement. It is found that if cables are concentrated in suitable arrangement, the magnetic field produced by the three-phase current source can be cancelled themselves. Then it is to investigate the effect of shielding materials when the characteristics of magnetic filed caused by cable arrangement are considered. From the study results, proper cable arrangement should greatly reduce magnetic field. The shielding metal sheets would have different effects according to the characteristics of magnetic field. It is required to study and select suitable shielding materials before they are used to reduce magnetic field.

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