STUDY ON ELECTROMAGNETIC SHIELDING OF THE TRANSMISSION LINES OF A MAGLEV TRAIN

Analyzed on all kinds of electromagnetic interference may occurred based on normal conducting magnetic levitation technology used in PUDONG magnetic train line of Shanghai in China, such as: DC magnetic field generated by the levitating magnet which is supported of DC ; A radio-frequency electromagnetic field generated in the transmission of wireless information between station and the train. An alternating magnetic field generated by the guide rail synchronous long stator linear motor to the power supply cable; The ultra-low frequency induced electromagnetic fields produced by substation and along high-voltage transmission lines and so on. Study the impact of ultra-low frequency induced electro-magnetic, which is generated by the existing high voltage, large current of largest free power supply section. Studied on the shielding method, shielding material and dimensions of shielding material about ultra-low frequency induced electromagnetic, Experiment on the ultra-low frequency electromagnetic field shielding based on the magnetic levitation experiment pus down experimental apparatus and high-power three-phase motor model. For such shielding materials as acrylic, aluminum, galvanized steel, carbon steel, 304 stainless steel and others , Experiments show that the ultra-low bcarbon steel can effectively shield low frequency electromagnetic fields generated by magnetic levitation without considering the thickness of the case.