本論文探討三相電力電纜產生磁場特性與熱場效應及磁場屏蔽方法，先應用有限元素法套裝軟體建立電力電纜模擬架構，再分析鋁板與矽鋼片對於磁場與熱場之屏蔽效應，期望能夠降低磁場與熱場耦合干擾。並進一步探討鋁板、矽鋼片搭配使用，找出最佳的屏蔽組合方式。本論文希望能確實找出電力電纜磁場與熱場的分佈特性，及可行的改善與屏蔽方法，使得變電所涵道的磁場能儘量降低，並有效改善涵道內的溫度分佈。由研究結果顯示，電纜排列不管是一字型或品字型，其屏蔽方式皆以鋁板在上矽鋼片在下可得最佳效果。本論文並將此方法運用在一次配電變電所涵道分析，成果可作為未來改善涵道磁場與熱場分佈的依據。

In this thesis, it is to study the magnetic-field and thermal-field effect caused by three-phase power cables and the suitable shielding methods. A finite element based simulation tool is used to establish the simulation models for power cables and to evaluate the effects of aluminium plates and silicon-steel plates on the magnetic field and thermal field. It is required to find the suitable combination method of aluminium plates and silicon-steel plates for better shielding purposes. This thesis hopes to find out the distribution characteristics of power cable magnetic field and thermal field. It is appreciated that the magnetic density inside a substation cable tunnel should be as low as possible to avoid any undesired problems and the temperature distribution could be lower. The simulation results show that either in the straight line or delta space arrangement of cables, the better stacking method of shielding materials is that aluminium plates should be placed above silicon-steel plates. The method in this thesis is applied to analyze the magnetic field distribution in a tunnel of a substation. The study results can be used to improve the distribution of magnetic field and thermal field.

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