Transformer construction There are two types of transformer Core type Shell type Both different from each other, and in which winding around the magnetic core. Magnetic core is a stack of thin silicon steel lamination about 0.35mm thick for 50hz transformer. To reduce eddy current losses, these laminations are insulated from each other by thick vernish. For core losses , all transformer have their magnetic core made from cold-rolled grain oriented sheet-steel(C.R.G.O). Core and Shell type The vertical portion of the core are usually called LIMB or LEG, top and bottom are yoke. This means single-phase transformer, core type 2-legged core where as shell type 3-legged core.
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