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A transformer is a device that changes ac electric power at one voltage level to ac electric power at another voltage level through the action of a magnetic field.
There are two or more stationary electric circuits that are coupled magnetically.
It involves interchange of electric energy between two or more electric systems.
Transformers provide much needed capability of changing the voltage and current levels easily.
They are used to step-up generator voltage to an appropriate voltage level for power transfer.
Stepping down the transmission voltage at various levels for distribution and power utilization.
1. Transformer Classification
In terms of number of windings
Conventional transformer: two windings Autotransformer: one winding
Others: more than two windings
In terms of number of phases
Single-phase transformer
Three-phase transformer
Depending on the voltage level at which the winding is operated
Step-up transformer: primary winding is a low voltage (LV) winding
Step-down transformer: primary winding is a high voltage (HV) winding
2. Primary and Secondary Windings
A two-winding transformer is shown below. It consists of two windings interlinked by a mutual magnetic field.
Primary winding –energized by connecting it to an input source.
Secondary winding –winding to which an electrical load is connected and from which output energy is drawn.
Arun Prasath N And Muthu Vijaya Pandian S
Arun Prasath N presently working as Senior Assistant Professor in Easa College of Engineering and Technology, Coimbatore.
Muthu Vijaya Pandian S , Professor in V.S.B College of Engineeing Technical Campus, Coimbatore
