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Top 16 Difference Between Core Type and Shell Type Transformer | Circuit Diagram

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In this article, I am describing the difference between core type and shell type transformer.

In an earlier tutorial, we have studied the electrical transformer and its construction. Under construction and winding, transformer are classified into two types such as-

  1. Core types of Transformer
  2. Shell types of Transformer

Both core-type and shell-type transformer consist of different factors like construction, voltage rating, electric power (kVA) rating, cost, size, insulation stress, and many more things.

Let see each of those factors.

Difference Between Core type and Shell Type Transformer

These two transformer types are classified based on transformer construction.

The transformer can also be classified into different types based on measurement, cooling system, electrical power and winding. Check the classification of the transformer for more detail.

In a tabular form, you can learn topmost 16 different points for core type transformer vs shell type transformer.

Sr. No. Content Core Type Transformer Shell Type Transformer
01 Magnetic Circuit  In a core-type transformer, a single magnetic circuit occurs in a series form. In a shell-type transformer, the double magnetic circuit occurs in parallel form.
02 Magnetic Flux The magnetic fluxes flow in only one magnetic path. The magnetic fluxes flow in two different magnetic paths.
03 Construction In this transformer, windings surrounded by the Core. In this transformer, core surrounded by the windings.
04 Winding Types Concentric or Cylindrical types of windings are used in core type transformer. Sandwich or Disc types of winding are used in shell type transformer.
05 Copper Winding (conducting material) It requires more copper for windings. It requires less copper for windings as compared to the core type transformer.
06  Voltage Rating It is used for low and medium voltage.  Usually, it is used for high voltage.
07 Cooling System Core type transformer can easily provide the natural cooling system (like Air) for winding. Shell type transformer can’t easily provide the natural cooling system for winding.
08 Core Limb (or Legs) The core consists of two limbs in a single-phase transformer. The core consists of three limbs in a single-phase transformer.
09 Insulation It requires more insulation. It requires less insulation over the core type transformer.
10 Maintenance It requires less maintenance as compared to the shell-type transformer. It requires more maintenance.
11 Repair It is easy to repair. You can easily remove and replace the coil from the core. It is very difficult to repair. You can’t easily remove coil from the core.
12 Power Output It gives low output power. It gives high output power.
13 Losses (Copper and Iron Losses) More losses occur in core types of transformer. Fewer losses occur in shell types of transformer.
14 Power Efficiency Core type transformer has a low power efficiency due to less output power and high leakage flux. Shell type transformer has high power efficiency due to high output power and low leakage flux.

Note: Learn here different type of Transformer losses in detail

15. Lamination Design of Transformer

‘L’ shape lamination is used for core type transformer design.

Lamination of core type transformer

‘E’ or ‘I’ shape lamination is used for shell type transformer design.

Lamination of shell type transformer

16. Circuit Diagram of Core Type and Shell Type Transformer

Core type transformer (types)

Circuit Diagram of Core Type Transformer

Shell type transformer (Types)

Circuit Diagram of Shell Type Transformer

I have covered 16 points in core type transformer vs shell type transformer.

Related differences to read

If you are ready to give the online quiz, you can directly join the Transformer Quiz.

electrical-transformer-quiz

If you have any queries related to the difference between core type and shell-type transformer, kindly share in the comment section.

Thanks for Reading!

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