The companies Rail Power Systems and F&S Prozessautomation have jointly developed and manufactured a transportable charging substation with a balancing converter. In order to be able to test the system, it was transferred to the Alstom plant in Salzgitter, where a charging station was set up and the interaction between the charging station and the BEMU was examined. The tests accompanied by the Technical University of Dresden provided functional proof for charging a traction vehicle with a symmetrical load on the supply network over the entire power range.