Difference Between Core type and Shell type transformer

Machines Transformer

 

S.No. Core type Transformer Shell type transformer
1. It requires less iron. It requires more iron.
2. It requires more conducting material. It requires less conducting material.
3. It is used in low flux density applications. It is used in high flux density applications.
4. It is economical for high voltage applications (since more space for insulation). It is not economical for high voltage applications.
5. Winding surrounds the core. Core surrounds the winding.
6. For 1-phase transformers, it has a two-legged core. For 1-phase transformers, it has a three-legged core.
7. Winding installed in both legs of the core. Windings installed in mid-leg of the core.
8. There is only one path of the magnetic circuit. There is two path of the magnetic circuit.
9. It has maximum leakage flux. Hence more losses. It has minimum leakage flux. Hence fewer losses.
10. Maintenance of this type transformer is simple. Maintenance of this type transformer is complex.
11. We cannot provide natural cooling for this type transformer. We can provide natural cooling for this type transformer.
12. In this type transformer, concentric cylindrical winding is used. In this type transformer, sandwiched winding is used.

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