What is an Autotransformer?
Autotransformer is a type of transformer that consists of only one winding wounded on a laminated core. A conventional transformer has two windings whereas autotransformer consists of a common winding for both primary and secondary windings. The remaining winding which is not shared by primary and secondary winding is called series winding.
The operating principle of an autotransformer is similar to a two-winding transformer. The primary & secondary winding of the autotransformer is linked both magnetically and electrically. Hence, the autotransformer transfers a part of the power from primary to secondary by inductive transfer, and the rest by conduction principle. Inductive power transfer means the transfer of power magnetically (via common winding), and conductive power transfer means the power transfer electrically (via series winding).
Autotransformers are ideal for use in railway, audio system, industrial, commercial & laboratory, safe starting of induction motor & synchronous motor, used as a voltage regulator, used as dimmer stat (continuous variable voltage autotransformer) to control the intensity of lamps, used as furnace transformer to supply power furnace and used as booster transformer to compensate voltage drop in transmission & distribution lines.
Key features of Autotransformers:
- Better voltage regulation (autotransformer maintain constant output voltage while wide load variation)
- More economical
- More efficient
- Low leakage flux
- Small excitation current
- Low losses
- Allow smoothly vary the output voltage from zero to the rated.
Autotransformers from the leading manufacturers are listed on everything PE. Our parametric search tool will scan multiple manufacturer websites to identify Autotransformers that meet your requirement. You can then download datasheets, request quotations via everything PE. Your inquiry will be routed to the manufacturer or their representative who will give you more information on the product.
