A transformer is static electrical equipment which transforms electrical energy (from primary side windings) to the magnetic energy (in transformer magnetic core) and again to the electrical energy (on the secondary transformer side). The operating frequency and nominal power are approximately equal on primary and secondary transformer side because the transformer is a very efficient piece of equipment – while the voltage and current values are usually different. Essentially, that is the main task of the transformer, converting high voltage (HV) and low current from the primary side to the low voltage (LV) and high current on the secondary side and vice versa. Also, a transformer with its operation principle provides galvanic isolation in the electrical system. With those features, the transformer is the most important part of the electrical system and provides economical and reliable transmission and distribution of electrical energy.
The transformer can transfer energy in both directions, from HV to LV side as well as inversely. That is the reason why it can work as a voltage step-up or step-down transformer. Both transformer types have the same design and construction. Theoretically, we can operate any transformer as step-up as well as step-down type. It only depends on the energy flowing direction.
Available link for step up transformer:
https://www.electrical4u.com/step-up-transformer/
