ENI-PLK2400/33/AC-DC Converter

Przetwornica ENI-PLK2400/33/AC-DC
rysunek techniczny przetwornicy ENI-PLK2400/33/AC-DC



The ENI-PLK2400/33/AC-DC converter is intended as a power source of 3 x 400 V, 50 Hz and 220 V, 50 Hz AC voltages and 56 VDC voltage for the on-board systems in retrofitted Type EL.2.100 electric locomotives.


 Supply voltage  2200 to 2800 VDC
 AC1, 2 rated output voltage AC1, 2 rated power output  3 x 400 VRMS, 50 Hz
 AC1: 22 kW - compressor
 AC2:  6 kW - fans, cosφ ≥ 0.8
 AC3 rated output voltage AC3 rated power output  230 VRMS, 50 Hz
 2 kW - heating, cos φ ≥ 0.8
 DC rated output voltage DC rated power output  56 VDC
 2.8 kW
 Minimum on-board battery voltage (for converter start-up)  33.6 VDC
 Ambient operating temperature  -30°C to +40°C
 Cooling  natural with ambient air
 Size [L x W x H]  1235 x 750 x 700 mm
 Weight  350 ± 20 kg
 Enclosure protection rating  IP54
 Installation  EL.2.100 locomotive body interior


The converter is housed in a sealed and durable aluminium enclosure box that is resistant to ambient and operating conditions. The enclosure size, the installation method and the electrical connections of the converter have been designed for installation of the device inside the Type EL2.100 locomotive bodies without major interference with the vehicle structure. The electric connections are housed in sealed metallic terminal boxes. Service access is possible beneath removable panels located on the converter enclosure's front. The cooling of operating components is provided by high-performance passive aluminium heat sinks.


The converter transforms the local 2.4 kVDC railway contact system supply voltage into stabilised output voltage:

  • 3 x 400 V, 50 Hz for compressor and fan power supply lines;
  • 220 V, 50 Hz for heating lines;
  • 56 VDC for the auxiliary lines and the battery bank, while providing the required galvanic separation of the input terminals from the output terminals.

The 3 x 400 VAC output operation is controlled by external signals from the on-board systems. This enables control over the compressor line AC1 and the fan line AC2 with the on and off signals and the control over the air system (via a pressure switch).

Converter functionalities:

  • soft start of the power processing circuit,
  • U/f=const controlled starting of the 3 x 400 VAC output to prevent the inrush current surges of the compressor motor and significantly increase its operating life,
  • maintenance of constant AC and DC output voltage values irrespective of variations in the HV contact system input voltage or the on-board loads,
  • AC and DC output overload and shorting monitoring and protection.


schemat blokowy przetwornicy ENI-PLK2400/33AC/DC.png

Power kW
Input voltage
2400 VDC
Output voltage
3 x 400 VAC , 230 VAC , 56 VDC

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