Type of Core Used
In laminated-steel-core transformers, two main types of cores are used: core type and shell type.
• Core type transformers have cores with a hollow square through the centre that was show in the below figure. Remember that the core is made up of many laminations of steel.
Figure: Core Type Transformer
• Shell type transformers are the most popular and efficient transformers and they have a shell core show in the below figure. Remember that each layer of the core consists of E- and I-shaped metallic sections, which are butted together to form the laminations. A laminations are insulated from each other before being pressed together to form the core.
Figure: Shell Type Transformer