Design and verification of an improved experimental platform for stray current in urban rail transit

With the rapid development of urban rail transit, there have been an urgent problem of excessive stray current. Because the stray current distribution is random and difficult to verify in the field, we designed an improved stray current experimental platform by replacing the simulated aqueous solution with a real soil environment and by calculating the transition resistance by measuring the soil resistivity, which makes up for the defects in the previous references. Firstly, the mathematical models of rail-drainage net and rail-drainage net-ground were established, and the analytical expressions of current and voltage of rail, drainage net and other structures were derived. In addition, the simulation model was built, and the mathematical analysis results were compared with the simulation results. Secondly, the accuracy of the improved stray current experimental platform was verified by comparing the measured and simulation results. Finally, based on the experimental results, the influence factors of stray current were analyzed. The relevant conclusions provide experimental data and theoretical reference for the study of stray current in urban rail transit.