To construct the transformer, we should have 2 coils having coefficient of mutual induction and a laminated (insulated) steel core. The 2 coils are insulated from one another and from the steel core. The device also will want some appropriate instrumentation for the gathered core and winding's, a medium with that the core and its winding's from its instrumentation is insulated.
Imperative to isolate and to carry out the terminal of the windings core from the tank of the transformer, apt bushings which are made of either ceramic ware or capacitor kind should be used.
Generally transformer used for commercial operation, the core is created out of transformer sheet steel laminations gathered to produce an eternal magnetic path with least of air-gap enclosed. The steel ought to have high porousness and less hysteresis loss. In place of this to happening, the steel ought to be made from high semiconductor content and should even be heat treated. By meritoriously laminating the iron core, the eddy current loss is reduced. The lamination is finished the assistance of a light-weight coat of iron core plate varnishes or lays an oxide layers on the exterior. For a frequency of 50 Hz operation, the thickness of laminations varies between the ranges 0.35-0.5mm for a frequency of 25 Hz.
The transformer can be varied in the manner of which the primary windings and secondary windings are as long as around the laminated core. Permitting to the design, the transformers are be classified as two types. They are