Converters for traction drive PTU

photo_ptu-convertersConverter PTU is a further stage of development of converter PTA. These converters can be used both on new tram cars and for revamping tram cars with asynchronous motors and tram cars T3 manufactured in Czech Socialist Republic in case asynchronous motors are installed on them. 


Main functions:

  • Converters are used for power supply and speed control of asynchronous traction motors. They were developed for tram cars 71-405, 71-407 manufactured by Uraltransmash, Ekaterinburg.


  • Converters are used for power supply of traction drives of trams with asynchronous motors. They can also be used for trams of other types and trolley buses.
  • Converters can be used for trams with autonomous run based on a supercapacitor energy storage unit with Lithium-ion storage battery.

Rated supply voltage, V 550
Range of input voltage variation, % From +50 to -50
Rated output voltage, V 3AC 345
Rated output voltage frequency, Hz 60
Range of output voltage frequency variation, Hz 0–150
Rated output current, A 250 300
Maximum output current, A 460
Converter efficiency factor, not less than, % 97
Control circuit voltage, V DC 24 ± 30% from external power supply
Power consumed by control circuits, up to, A 10
Climatic type U1 U2
Operating ambient temperature, °С From -40 to +40
Relative air humidity Up to 100 % at +25° С
Unit height above sea level, m Not exceeding 1000
Protection class IP54
Dimensions (H х W х D), mm 250 х 900 х 500
Weight, kg 100

Converters are manufactured in 2 modifications — for roof installation (climatic type U1) and for installation under the tram car floor (climatic type U2).

Converter PTU has all advantages of converter PTA, but compared to the latter the former is considerably smaller and lighter.


power supply distribution cabinet (А0); control cabinet and control circuit power supply distribution cabinet (А6); operator panel; reactor cabinet; mechanical brake control device; braking resistors.

Guaranteed service life is 12 months from putting into operation, but no longer than 18 months from delivery date. Other warranty obligations can be stipulated in the contract.