Question

constructional difference between core type and shell type transformer

Answer 1

In core type transformer the core surrounds the windings whereas in shell type transformer the winding surrounds the core of the transformer.In core type transformer the lamination is cut in the form of L-shape whereas, in shell type transformer, the laminations are cut in the E and L shapes.The cross-section area of the core type transformer is rectangular, whereas the cross-section area of the shell type transformer is square, cruciform two slipped, or three stepped in shapes.The core type transformer requires more copper conductor as compared to shell type transformer because in core type transformer the winding is placed on the separate limbs or legs.The core type transformer is also called cylindrical or core winding transformer because their windings are arranged as the concentric coil. In shell type transformer, the low voltage winding and the high voltage winding are put in the form of the sandwich, and hence it is called the sandwich or disc winding transformer.The core type transformer has two limbs, whereas the shell type transformer has three limbs.The mechanical strength of the core type transformer is low as compared to shell type transformer because the shell type transformer has bracings.

Answer 2

$\green{ \fcolorbox{grey}{grey}{ \checkmark \: \textsf{Verified \: answer}}}$

Differences between the core type and shell type transformer Are:-

• In core type core is surrounded by the winding while in shell type winding is surrounded by the core.
• In core type concentric cylindrical winding is used while in shell type Sandwiched winding is used.
• Core type is made by the L or I-U shape lamination while shell type is made by E-I or E-E type lamination
• In the core type there is one magnetic circuit while in shell type there is 2 magnetic circuit.
• Core type construction is used for larger low voltage transformer while shell type is used for small high voltage transformer.