In order to avoid the stray current in DC traction power supply system

AC power supply system is used more and more in the subway

light rail and other urban rail transit design.This paper studies the AC power supply scheme of city rail traffic and using CDEGS software to establish the city rail transit traction power supply system model of AC power supply mode

which is combined with a city Metro Airport line structure data.The electromagnetic field distribution along the urban rail transit under AC power supply mode and electromagnetic radiation on human health and the surrounding environment is analyzed.Results show that the spatial electric field of the traction network is distributed symmetrically at the center of the railway.With the increase of the vertical distance from the railway center

the electric field intensity first increases and then decreases.The spatial magnetic field of the traction network under single-locomotive working condition is asymmetrically distributed

and is smaller than the magnetic field strength under the double-locomotive working condition;The safe distance of space magnetic field radiation under different conditions is obtained through simulation

which provides a reference for the power supply of city rail traffic design and electromagnetic protection work.