In a shell-type transformer, where are the coils placed?

In a shell-type transformer, the coils are positioned on the central leg of the core. This design is integral to the transformer’s functionality, as it helps to enhance efficiency and improve magnetic coupling between the coils.

The shell-type transformer features a core that surrounds the windings, effectively confining the magnetic field and reducing losses associated with leakage flux. By locating the coils on the central leg, the construction allows for a more compact design that maximizes magnetic circuit efficiency. This arrangement also helps to minimize the effects of external magnetic fields and enhances the overall performance of the transformer.

Other options, such as placing the coils on the outer surface or along the sides of the core, would not provide the same level of magnetic coupling or efficiency as seen with the coils placed on the central leg. Additionally, placing the coils inside the tank might lead to other design complexities that are typically not found in shell-type transformers. Therefore, the placement on the central leg is a key characteristic of this type of transformer.