本論文探討161kV地下電纜線路電力頻率磁場的分佈情形，研討可行的磁場抑低技術。從二方面探討可行改善方法，（1）地下電纜較佳的排列方式，使各回線三相電流產生的電力頻率磁場儘量互相抵消，（2）使用金屬材料屏蔽主要磁場源，進一步減少涵洞上方磁場強度。此外探討採用降低磁場技術於現行設計規範，提出新設地下電纜線路之設置建議。由研究結果顯示，較佳的地下電纜涵洞相序排列能確實抑低線路磁場，使得地下電纜線路磁場能儘量降低。

The purpose of this thesis is to evaluate the magnetic field condign around the 161kV underground cables. It is required to use in magnetic field analyis and mitigation method selection. In this project, two feasible approaches could be used to reduce the magnetic field. (1) It is to obtain the better arrangement methods of underground cables to reduce the magnetic field. It is to make the magnetic field caused by the three-phase currents cancel themselves. (2) It is to use relevant metal materials to shield the main magnetic field source to further reduce the magnetic field around the cable tunnels. Then, it is hoped to give new suggestions about new technology for use in the new construction of transmission lines including underground cable circuits. From the study results, better cable arrangement of underground cable tunnels should greatly reduce magnetic field. Let the magnetic field of underground cables be as low as possible.

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