Difference between core type transformer and shell type transformer

Core type Transformer

• It requires less iron.

• It requires more conducting material.

• Core type Transformer is used in low flux density applications.

• Winding surrounds the core.

• Winding installed in both legs of the core.

• There is only one path of the magnetic circuit.

• Maintenance of this type transformer is simple.

• We cannot provide natural cooling for this sort transformer.

• In this type transformer, concentric cylindrical winding is employed .

• It has maximum leakage flux. Hence more losses.

• For 1-phase transformers, it has a two-legged core used.

• It is economical for high voltage applications.                                                                                       

                                                                                                                                                                                                                

                                                                

Shell type transformer

• It requires more iron.

• It requires less conducting material.

• It is used in high flux density applications.

• Core surrounds the winding.

• Windings installed in mid-leg of the core.

• There is two path of the magnetic circuit.

• Maintenance of this type transformer is complex.

• We can provide natural cooling for this sort transformer.

• In this type transformer, sandwiched winding is used.

• It has minimum leakage flux. Hence fewer losses.

• For 1-phase transformers, it has a three-legged core.

• It is not economical for high voltage applications.