Which type of shell transformer or core transformer is larger?

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If the shell transformer and the core transformer are calculated according to the capacity, the core transformer is smaller.

The difference between shell transformer and core transformer

According to the arrangement of the windings in the core, transformers are divided into two types: core type and iron shell type (or referred to as core type and shell type).

There are two types of iron-core three-phase transformers: three-phase three-iron core column type and three-phase five-iron core column type.

Iron-shell single-phase transformer with a central core column and two branch core pillars (also known as side yokes), the width of the central core column is the sum of the widths of the two core columns. All the windings are placed on the central core column, and the two branch core pillars are like "shells" around the outside of the windings, which is called a shell transformer.

The core of an iron-shell three-phase transformer can be seen as consisting of three independent single-phase shell transformers arranged side by side.

The structure of the core transformer is relatively simple, the distance between the high-voltage winding and the iron core is far, and the insulation is easy to handle. The structure of the shell transformer is more complex, the distance between the high-voltage winding and the core column is closer, and the insulation treatment is more difficult. The shell structure is easy to strengthen the winding mechanism so that it can withstand large electromagnetic forces, especially suitable for transformers passing through large currents.

Compared with the capacity and voltage, the volume of the core type is smaller.

Oil-immersed transformers are generally used for large-capacity transformers.

Oil-immersed transformers are installed in a sealed metal box with the main components of the transformer, including the core and coil, and soaked in a special insulating oil to improve the insulation performance and heat dissipation capacity. This kind of oil-immersed transformer not only has a large volume and large capacity, but also can withstand high voltage, and has the characteristics of good heat dissipation and anti-short circuit.

Oil-immersed transformers have the following advantages:

1.Good insulation performance: Oil-immersed transformers use highly insulating oil as the insulating medium, so they can withstand higher voltages, ensuring the normal operation and service life of electrical appliances.

2.High heat dissipation capacity: The oil of the oil-immersed transformer can effectively dissipate heat, so it is possible to install a large-capacity transformer and allow for short-term overload.

3.Strong short-circuit resistance: The insulating oil of the oil-immersed transformer can effectively isolate the winding and the core, reduce the short-circuit damage, and improve the short-circuit resistance of the transformer.

Therefore, oil-immersed transformers are the first choice for large-capacity transformers, which are widely used in power systems, industrial production and other occasions.

Dry-type transformers are widely used in large-capacity transformers.

electric furnace transformer, electric welding transformer; or power transformers for electronic devices and televisions, radios, etc.