Emc On City Subway

The rapid development of subway makes travailing convenient and comfortable, and increases the pace and efficiency of urban life. Electromagnetic compatibility (EMC) has ability of resisting electromagnetic interference from outside electrical, which contains equipments, electronic equipments or systems and bring little electromagnetic interference to other equipments. The Subway can be strengthened in reliability and safety by researching the EMC of City Subway and the influence of electromagnetic radiation impacting on environment that can be weakened. Subway system is a complex system and has very large structure. In this paper, the research object is subway, whose EMC is mainly analyzed.First, the paper analyzes urban electromagnetic environment in macroscopic view, finds out the main sources of electromagnetic radiation, and points out the possible hazards. The City Subway is one of main electromagnetic radiation sources. The paper gives some advices and protective measures to subway car manufacturer and Operation Company combining with project, and then researches the EMC of the equipments and systems of Subway car in microscopic scales. The paper adopts cables layout as the starting point based on EMC design theory, establishes cables and wiring trough model, analyses cable shielding effectiveness and magnetic field coupling between the cables use simulation software Ansoft Maxwell referring to design standards and contrast simulation. The paper verifies the relationship of the shielding effectiveness and shielding materials successfully, finds some effective measures of EMC design.The paper also applies the EMC design theory to the subway signal system EMC design. The EMC of the subway signal system is one of the key and core technologies to the safe operation of subway car. The paper analyzes some interference sources vulnerable devices and cannot be disturbed devices, which may cause interference to systems on the basis of known the work of signal system, researches coupling path of interference, the paper makes the EMC design referring to standards of equipment production, installation and use, eliminates the risk of the EMC signal system, and ensures the operation of system and equipments safe and reliable.