Types of Transformer

There are different types of transformers and different ways to classify the transformers. Both for its functionality (power, communications, media), for its applications (voltage reducer, insulation, impedance), among other different types of classifications.

Types of transformers

  • For its phase (single phase, three phases)
  • Autotransformer
  • Impedance
  • Power
  • Communications
  • Measure
  • Elevator / voltage reducer
  • Isolation
  • Feeding
  • With split diode
  • Variable frequency
  • Pulses
  • Line or flyback
  • Hybrid
  • Balun

For its phase


Single-phase monophase transformers are often used to provide electrical power for residential lighting, power-drafts, air conditioning, and heating.
Monophonic transformer


It is the most extensive application in the systems of transport and distribution of electrical energy. This type of transformer is built for nominal powers also highIt can be said that it is constituted by three single-phase transformers mounted on a common magnetic core. 
Three-phase transformer


The autotransformer can be considered simultaneously as a particular case of the transformer or coil with an iron core. It has a single coil wound on the core, but has four terminals, two for each circuit, and therefore has points in common with the transformer. The operating principle is the same as that of the common transformer.


Impedance transformer

Impedance transformers are generally constructed from a ferrite or pulverized iron core that can be found in the form of a ring, toroid or rod that is almost always cylindrical.
Impedance transformer


They are those used in substations and transformation of high and medium voltage energy. They are large-sized devices, the power transformers must be very efficient and must dissipate the least possible amount of energy in the form of heat during the transformation process.

The efficiency rates are usually above 99% and are obtained using special steel alloys to couple the magnetic fields induced between the primary and secondary coils.
Power transformer


Expected to work with variable voltages and frequenciesThey are used,  mainly, in electronic applications.
Communication transformer


Measuring transformers allow the measurement and protection devices of high voltage to be isolated. They work with proportional currents or voltages which are subject to monitoring and manage to avoid disturbances that magnetic fields can produce on the measuring instruments.

Measurement transformer

Elevator / Voltage Reducer

The Reducing Transformers and Elevators allow operators to increase or decrease the electrical voltage (VCA) to match the load requirements.



The isolation transformers have a ratio of 1: 1 between their primary and secondary windings. Which means that both windings have the same turns (turns), so their output delivers the same voltage that was applied to the input. It is used pr in cipalmente as a protective measure.Isolation transformer


They can have one or several secondary coils and provide the necessary voltages for the operation of the equipment. Sometimes it incorporates a thermal fuse that cuts off its primary circuit when the transformer reaches an excessive temperature, preventing it from burning. It is mainly used to power electronic circuits.

Power transformer



A pulse transformer is an improved transformer that produces electrical pulses of great speed and constant amplitude. They are usually used in the transmission of digital information and in transistors (especially with gate driver circuits).

Pulse transformer


It is an application transformer in telephones, network cards, etc. This transformer is responsible for dividing the input and output signals. It converts bidirectional communication on two wires into two unidirectional connections to two wires, which is then known as 4-wire communication.

 Transformer hybrid