800 / 2022-03-31 22:48:59

Study on Characteristics of Electromagnetic Interference Caused by Subway Train Movement

subway,power Grid,DC magnetic Baic,Electromagnetic Coupling

 With the rapid development of urban power grid and subway system, the mutual influence between them becomes more and more serious. The dc magnetic bias of transformer caused by subway becomes the main research direction. In this paper, the characteristics of dynamic electromagnetic coupling between subway train and transmission line are studied. First, the motion equation of subway is written out according to the running law of the train, and three coupling relations are given according to the position of the train, and the calculation method of dynamic induced voltage is deduced. Then the influence of parallel length and distance between subway and transmission line on induced voltage is studied. The dynamic induction voltage increases first and then decreases with the increase of the parallel length of subway and transmission line, and decreases with the increase of the distance between them. It is proposed that the electromagnetic coupling of a single train has limited influence on the dc magnetic bias of transmission lines, but the influence of dynamic electromagnetic coupling can not be ignored when multiple trains are running simultaneously.