Auxiliary Converters for Substation


The converter is fed by 25 kV, 50 Hz overhead line. It is used in order to supply various loads inside the substation facilities (power supply for integrated lighting and information systems, railway signaling and protection systems, etc.). Overhead line might generate spikes, sags and surges caused by the current drawn from locomotives. Those are likely to damage the input stages of conventional converters.

In order to provide a trackside noise filtered power source, we use the same technology as for our rolling stock converters.

The converter is primarily intended to be used as a backup energy source (in case of power outage from the distribution network). However, in projects where poor or no distribution network is available at site, this converter can be implemented as a primary power source as well.


  • Rolling stock converter technology
  • Robust input rectifiers
  • Nearly sinusoidal input current, in phase with the input voltage
  • Output transformer ensures galvanic isolation
  • Sine wave output filter
  • EMC output filter
  • Easy maintenance
  • Modular design of power unit
  • Air cooling

Basic technical data

Input voltage 230 V, 50 Hz over transformer 25 kV / 230 V
Minimum input voltage 160 V (equivalent to 17,5 kV of overhead line voltage)
Maximum input voltage 270 V (equivalent to 29 kV of overhead line voltage)
AC output 3 x 400 / 230 V, 50 Hz, 30 kVA / 50 kVA
Cooling Forced air-cooling
Size 600 x 600 x 2000 mm / 800 x 800 x 2250 mm
Weight 504 kg / 760 kg
Mounting place Substation
Connecting interface CAN / MVB / Ethernet
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KONČAR INEM is leading regional manufacturer of Electronics and power electronics devices and systems for Energy and transportation sectors and ICT solutions.
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