本論文探討輸電電纜管路所產生電力頻率磁通密度之分佈情形，研討可行的抑低方法。首先搜集世界各國政府及組織對於電力頻率磁場的規範值，以及電磁生物效應之研究報告，做為磁場暴露限制值依據的分析探討。接著使用自行撰寫之MATLAB®程式計算磁場分佈情形，並利用相序排列與實際空間配置方式探討電纜之較佳佈設方式，以降低所產生的磁通密度。當已建設輸電線路通過敏感性地區時，為達成較大減磁效果，有時需考慮鋪設屏蔽金屬板。本文將使用導磁性材料及導電性材料做為屏蔽材料，透過FLUX3D®電磁數值分析程式，計算磁場屏蔽效能。最後由實例驗證，使用磁場量測儀器進行161kV電纜管路及人孔之磁場值實測，記錄使用屏蔽板施做減磁改善前後之磁場值變化情形，並與模擬計算值做比較。本文係依據實際電纜管路及人孔配置建構模型，冀望能確實掌握輸電電纜之磁場分佈特性，提出經濟面與工程兼具可行之減磁改善方法，俾使輸電電纜線路周圍的磁場值能儘量降低，減少民眾對輸電線所產生電磁場的疑慮。

This thesis evaluates and analyze the power frequency magnetic field due to the underground transmission lines. It is required to develop the computation programs for use in magnetic field analysis and mitigation method selection. It is hoped to obtain the distribution of magnetic field produced by underground transmission lines and feasible strategies to increase the performance of transmission equipments. At first, the general purpose electromagnetic program, FLUX3D®, is used to set up the models to calculate the magnetic field values. The models should consider the types of ducts and manholes. Then a feasible approach could be used to reduce the magnetic field. It is to use relevant metal materials to shield the main magnetic field source to reduce the magnetic field conditions around ducts and manholes. At last, some measurement devices are used to measure the magnetic field around the cable to obtain the distribution characteristics of magnetic field, and an experiment of the shielding framework is made to prove the improving effect of the shielding. It is respected to find out the distribution characteristics of the electric frequency magnetic field of underground transmission lines. The mitigation methods should consider economics and technology feasibility to let the magnetic field around underground transmission lines is as low as possible.

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