In the operation of urban rail transit, the stray current of the subway is generated and flows into the earth, resulting in different ground potentials of each substation, which causes the DC magnetic bias of the transformer. Firstly, this paper establishes the stray current distribution model of dual-terminal power supply mode of subway, and simulates the dynamic change of stray current by adjusting the change of subway position. Then, the COMSOL software is used to build the coupling model between the subway operation line and the urban AC gr...
