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There are two primary winding of single turn and it overlaps the secondary. Insulators made from varnish or enamel is used to separate primary and secondary winding.Insulation in transformer prevents conductors shorting.
After shredding some copper wires we saw the heart of the transformer “The Core”.This type of construction of core is known as Toroidal core in which the conductor tightly surrounds the core in a manner that there is no air gap. Ferrite Toroidal core is used for high frequency working to reduce losses as well as its physical size.