External power supply for railway maintenance plant

Frequency converter with intermediate voltage circuit and pulsed line converter (AFE)

Knorr-Bremse PowerTech supply advanced electronics equipment to the Deutsche Bahn for new rail vehicle test benches together with Fest AG

Knorr-Bremse PowerTech delivered in total four modular designed frequency converters with DC bus and active front end of 120 kW each. These converters are part of the four multi-voltage testing units, providing AC and DC supply voltages for external power supply to many different types of train. The required voltage and frequency are set for testing trains in either 3-phase or 1-phase operation.

The test bench can thus be used to carry out tests and maintenance work on the trains with the components installed. Removal of the components for testing is not necessary. Also, depending on the vehicle type, each rail can be supplied differently.

Deutsche Bahn deployed this new rail vehicle test bench to maintain and test passenger coaches. It is also used as a medium-voltage test bench to test complete coaches, including heating, ventilation and air conditioning (HVAC), lighting, auxiliary power converters, wiring etc.


Multi-voltage test systems for the provision of AC/DC supply voltages for external supply to various train types


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Frequency converter with intermediate voltage circuit and pulsed line converter (AFE) 


Multi-voltage test systems for the provision of AC/DC supply voltages for external supply to various train types