Autotransformers Revolutionize Energy Efficiency and Grid Stability

High voltage transmission networks must transfer large bulks of electrical energy from generating power plants to distribution substations. For those applications, autotransformers can be used to effectively lower or increase the different voltage levels across the interconnection system.

Prolec® GE and Waukesha® autotransformers are used by utilities worldwide, confident that the advanced simulation tools we utilize for our designs result in outstanding quality and reliability.

Waukesha and Prolec GE Autotransformers

Autotransformers are manufactured in our Mexico, United States and Brazil facilities.

Typical Ratings

  • High voltage: 115 kV through 765 kV – wye connection
  • Low voltage: 69 kV through 345 kV – wye connection
  • Tertiary voltage: Less than 34.5 kV – delta connection (when required)

Plant Capabilities

  • Up to 1000 MVA
  • Up to 550kV (North American facilities), 800kV (Brazil facility) high voltage

Common Characteristics

  • More economical than transformers with two full windings.  Because they have a shared winding, autos have a reduced amount of copper and insulation required.
  • Smaller footprint: Due to the shared winding, autotransformers have smaller dimensions and weight than regular transformers. This is beneficial at the substation by saving space and during shipping as well.
  • Autotransformers have lower losses than two full winding transformers, so they are more efficient.
  • Autotransformers can have additional features like an Load Tap Changer and a tertiary winding as required by customers.
Prolec GE Autotransformer in substation Prolec GE Waukesha Autotransformer on the test floor Prolec GE Brazil Autotransformer Prolec GE Brazil Autotransformer on test floor Prolec GE Monterrey Autotransformer in a substation Prolec GE Monterrey Autotransformer in a substation

Prolec GE Monterrey

Prolec GE Waukesha

Prolec GE Brazil