| Abstract |
A new water-cooled PWM inverter to supply the three phase traction motor driving an invidual wheel propulsion of a tram has been developed. The inverter is of the neutral point clamped type, working with a rated overhead line voltage of 750 V DC. Switching elements are bipolar transistor modules, mounted on a water cooled plate. Drive units check the conduction state of the connected transistor and generate a feedback signal. Based on these signals pulse sequencing, short-circuit and failure detection is done by a protection unit. Detailed information about the kind of failure will be stored for fault location purpose. The equipment is designed to be mounted on the roof of the tram. |
