本論文運用有限元素法套裝軟體FLUX 3D建立地下電纜涵洞模擬架構，探討地下電纜涵洞磁場屏蔽與熱效應分析，分析金屬材料與屏蔽架構對於磁場的抑低效果。屏蔽效果的重要因素為導電係數及導磁係數，屏蔽方式以平行放置於涵洞上方優於放置於涵洞左右兩側。分析地下電纜涵洞之熱效應，應考慮土壤熱導係數的影響，溫升與溫度分佈特性，及屏蔽後對地下電纜涵洞溫度的影響，以達到降低電力頻率磁場強度與改善溫度分佈。由研究結果可知使用金屬屏蔽，確實可達到抑低磁場，且同時亦有改善溫度的效果。成果可實際運用在地下電纜涵洞，作為改善磁場與熱效應的依據。

In this thesis, Flux 3D, a finite element based simulation tool is used to establish the simulation models for underground cable tunnels. It is to study the shielding of magnetic field and thermal effect analysis of underground cable tunnels. From the distribution of magnetic field of underground cable tunnels, the effect of reducing magnetic field by using different metal materials and shielding models is obtained. The important facts of shielding effect are conductivity and permeability. The method to put them above the tunnels is better than on the side walls. It is to analyze the thermal effect of underground cable tunnels, the effect of soil thermal conductivity parameters, and the temperature rise distribution characteristics. It also examined temperature in underground cable tunnels after shielding. It wants to reduce power frequency magnetic field intensity and improve the distribution of temperature. From the study results, the shielding metal plate can reduce the magnetic field, and in the mean time, it can also improve the temperature. The study results can be practically used to improve the magnetic field and thermal effect of underground cable tunnels.

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