Fixed and Variable Autotransformers


More economical and less bulky than a transformer


Adjust the tension without isolating the secondary winding relative to the primary

AutotransformateursCharacteristics :

  • Dry type impregnated material
  • Power of 10 kVA to 6 MVA
  • 24 kV voltage
  • Frequency ≤ 6 kHz
  • Natural air cooling (AN) and forced air (AF), forced water (WF)
  • Copper or aluminum coil


Applications :

  • voltage change with reduced congestion.
  • voltage change without reducing the impedance of a network
  • voltage drop compensation in long cable lines (eg tunnel)


Meets standards :

IEC 60076-11: Power transformers - Dry-type transformers