Structure Of Dry-type Transformer

The structure of Dry Type Transformer mainly includes the following key parts:

1. Body

Core: The core part of the magnetic circuit. In order to reduce eddy current loss, the core is usually made of thin silicon steel sheets stacked in an interlaced manner, and the surface of the silicon steel sheets is coated with insulating paint and oxidized to form an insulating layer. The core is mainly composed of the core body, fasteners and insulating parts, among which the core body structure has two types: shell type and core type.

Winding: The circuit part of the transformer, usually made of copper or aluminum wire wrapped in insulating paper. The primary and secondary windings are concentrically sleeved on the core column, of which the low-voltage winding is usually located on the inside and the high-voltage winding is located on the outside. However, in large-capacity, low-voltage and high-current transformers, the low-voltage winding is sometimes placed outside the high-voltage winding.

2. Shell

Depending on the design, the shell of dry-type transformers can be divided into three types: open type, closed type and cast type:
Open type: The body is directly exposed to a dry and clean indoor environment, suitable for occasions where the ambient temperature is 20 degrees and the relative humidity does not exceed 85%. This type of transformer is usually cooled by air self-cooling or air cooling.
Enclosed type: The body is enclosed in the shell and is not in direct contact with the outside air. This design is mainly used in mining occasions and belongs to explosion-proof transformers.
Casting type: Epoxy resin or other resins are used for casting as the main insulation. It has a simple structure and small size, and is suitable for transformers with smaller capacity.

In summary, the dry-type transformer has a compact structure and reasonable design, which ensures its efficient and stable operation in various application environments.