Core type and  Shell type transformer

Core type transformer

In this transformer, the windings surround a considerable part of the core. Both the windings are bound on two opposite limbs of the core. This transformer is also called single window type transformer.

Shell type transformer

In this transformer, the core surrounds a major part of the windings. Both the windings are wound on the central limb of the core. This transformer is also called double window type transformer.