METHOD FOR FUNCTIONALLY CHECKING A VACUUM SWITCH OF A TRACTION INVERTER

摘要

The method involves parallely connecting a network-side four-quadrant controller and a pulse power converter. A primary winding of a traction transformer is connected with network-alternating current (AC) voltage by a vacuum switch that is represented as a transmission path (28). The controller is controlled by the opened switch when the voltage temporally lies relative to controller input voltage such that a differential voltage between the AC and input voltages corresponds to a preset test voltage. A determination is made to find whether current flows from a supply network to the controller.