What is shell type transformer? its construction, working, advantages, disadvantages & Applications

A shell type transformer is a type of transformer in which the magnetic core is in the form of a shell, and the windings are wrapped around it. It is also known as a core-type transformer, and it is commonly used in low voltage applications such as power distribution.

Construction of shell type transformer:

The construction of a shell type consists of two main parts: the magnetic core and the windings. The magnetic core is made up of a laminated steel core in the shape of a shell or a closed magnetic circuit. The windings are placed around the core and are usually made up of copper wires.

Working of shell type transformer:

In this type, when an AC voltage is applied to the primary winding, it produces an alternating magnetic field in the core. This magnetic field induces a voltage in the secondary winding, which is connected to the load. The voltage induced in the secondary winding is proportional to the number of turns in the winding and the rate of change of the magnetic field. This process of converting electrical energy from one voltage level to another is called electromagnetic induction.

Advantages of shell type transformer:

  1. High efficiency: Transformer have high efficiency, which means they can transfer power with minimal loss.
  2. Low magnetic leakage: Due to the closed magnetic circuit, there is low magnetic leakage in shell type .
  3. Compact design: The compact design of this transformer makes it suitable for applications where space is limited.
  4. High voltage isolation: This transformer provides high voltage isolation between the primary and secondary windings.

Disadvantages of shell type transformer:

  1. High manufacturing cost: The manufacturing cost of a transformer is higher than other types of transformers.
  2. Heavyweigh:This transformer is relatively heavier than other types of transformers.


  1. Power distribution: It is commonly used for power distribution in low voltage applications.
  2. Lighting: It is used in lighting application to convert high voltage to low voltage.
  3. Industrial applications: This transformer is used in various industrial applications such as welding, motors, and generators.
  4. Medical applications: It is also used in medical applications such as X-ray machines and MRI machines.

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