What are the two common forms of construction used in single-phase transformers?

The two common forms of construction used in single-phase transformers are core type and shell type.

The core type transformer features a core that is made up of two vertical limbs and a horizontal limb, with the windings placed around the limbs. This design provides good magnetic coupling, which enhances efficiency and reduces losses in the transformer. The core is constructed using laminated sheets to minimize eddy current losses.

On the other hand, the shell type transformer has a core that surrounds the windings. This configuration provides excellent magnetic path efficiency and improves mechanical strength. The windings are placed inside the core, allowing for better insulation and thermal management.

These two construction types are preferred because they effectively manage the magnetic flux and enhance the overall performance of single-phase transformers, making them reliable for various applications in electrical systems.