Core type Transformer
These transformers are quite favorite in High voltage practical applications like Distribution, Power, and Auto-Transformers.
Shell Type Transformer
In shell type transformers, winding is positioned on the middle limb of the core while other limbs are utilized as the mechanical support.
These transformers are quite favorite in Low voltage practical applications such as transformers employed in electronic circuitry as well as in power converters.
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This article is intended to cover the key differences between Core type and Shell type Transformers on the basis of many practical factors such as Windings, Limbs, Copper Requirement, Lamination, Flux Distribution, Windings Position, Cooling, Repair, Out, Design, Efficiency, Mechanical Strength, Leakage Reactance, Heat Dissipation, and Application. The following table keys out the main differences between Core and Shell type Transformers.
Difference between Core type and Shell type Transformer
Characteristics Core type transformer Shell type transformer
Winding In this type, winding surrounds the core In this type, core surrounds the winding
Limbs It has two limbs It has three limbs
Copper requirement Requires less Requires more
Lamination Laminations are usually in the form of alphabet letter L Laminations are usually in the form of alphabet letter E and L
Flux distribution Flux is equally distributed on the side limbs Side limbs carry the half of the flux while the central one carries the whole flux
Windings position Primary and secondary both windings are wound on the side limbs Both windings are wound on the central limb
Magnetic circuit Only one magnetic circuit There are two magnetic circuits
Types Cylindrical Multilayer and Sandwich type
Cooling Better cooling because more surface is exposed to external atmosphere Natural cooling is not very effective so fans are used
Repair Easy to repair because assembly can be dismantled easily Difficult to repair because both windings are on the same limb
Output Output is less because of more losses so less efficiency Output is high because of less losses so efficiency is high in this type
Design Easy in design and construction Comparatively complex
Mechanical strength Low because of non-bracing Possesses high mechanical strength
Leakage reactance Leakage reactance is not easily possible In this type, leakage reactance is highly possible
Heat dissipation Better heat dissipation from windings Windings are surrounded by core so heat dissipation is not easy
Application Used for high voltage application like power transformers, autotransformers Used for low voltage application like transformers in an electronic circuits