本論文探討一次配電變電所出口地下電纜涵洞和管路周圍電力頻率磁場的分佈情形，分析磁場特性，並提出降低改善對策。首先應用機率的概念，分析地下管路只有輸電線路和輸配電線路共構時，電流分佈機率，預測周圍可能產生的磁場值。本文並探討地下涵洞和管路內電纜相序排列對降低環境磁場的作用，藉由較佳的排列方式，會使各電力電纜產生的電力頻率磁場盡量互相抵消。由研究結果顯示，依不同的電流機率設定條件，會得到不同的磁場期望值，預估涵洞和管路未來完工時，將能合理的預測周圍可能產生的磁場。依磁場分量的特性，給予較佳的相序排列，則能獲得明顯的抑制效果。

The purpose of this thesis is to study the distribution characteristics of power-frequency magnetic field from underground cable tunnel and cable tube for a primary distribution substation (D/S), to analyze the characters of magnetic field, and to propose the improvement methods. Firstly, using the concept of probability, it is to analyze the current probability for underground tube either with only transmission lines or transmission and distribution lines. It wants to predict the power-frequency magnetic field around the underground tube. This thesis also evaluates the magnetic field conditions around the underground tunnel power line. The better arrangement of cables can reduce magnetic field. By the better arrangement methods, the power-frequency magnetic field caused by the power line cables can cancel themselves. From the study results, according to different conditions of current probability, it will get different expectation value of magnetic field. In the construction of tunnel and tube in the future, it will reasonably predict the power-frequency magnetic field that may be produced around the underground tube. Depending on the characteristics of the weighting of each cable, magnetic field can be reduced greatly by using better cable arrangement.

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