| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 88 === This thesis focuses on the problems of the electromagnetic compatibility due to the power-supply system of the vehicles. For evaluating background noise levels before the Taiwan high-speed train system is built, the power-frequency magnetic fields and radio-frequency electromagnetic noises are measured at several locations near the high-speed train route. The measured results are also compared emission of the whole railway system to the outside world with the European Norm, prEN50121-2. Besides, the magnetic compatibility measurements are performed for the vehicles of the Taiwan Train Company and Taipei Rapid Transit Corporation, and also an electric motorcycle. The results are compared with the European Norm and China National Standard. Thus, the electromagnetic interferences due to those vehicles can be analyzed. On the other hand, approaches for shielding magnetic fields are also studied in this thesis. The shielding performance of the metal wires on power-frequency magnetic fields is evaluated by applying a quasi-static magnetic method. Also, a finite element program, FLUX3D, is used to determine the shielding effects of the metal plates on low-frequency magnetic fields. Besides, measurements on the magnetic field shielding of the metal plates are performed to verify the simulation results. Thus, those methods may be employed to mitigate the low-frequency magnetic-field interferences caused by vehicle systems.
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