Main applications of the transformers are given below:
- To change the level of voltage and current in electric power systems.
- As impedance-matching device for maximum power transfer in low-power electronic and control circuits.
- As a coupling device is electronic circuits.
- To isolate one circuit from another, since primary and secondary are not electrically.
- To measure voltage and currents; these are known as instrument transformers.
Transformers are extensively used in AC power systems because of the following reasons:
- Electric energy can be generated at the most economic level (11–33 kV).
- Stepping up the generated voltage to high voltage, extra high voltage EHV (voltage above 230 kV), or to even ultra high voltage UHV (750 kV and above) to suit the power transmission requirement to minimise losses and increase transmission capacity of lines.
- The transmission voltage is stepped down in many stages for distribution and utilisation for domestic, commercial and industrial.