Dry Type Cast Resin Transformer Knowledge

Dry type cast resin manufacturers believe that dry-type transformers refer to transformers whose iron cores and windings are not immersed in insulating oil. Dry-type transformers have two cooling methods: natural air cooling (AN) and forced air cooling (AF). There are two types of dry-type transformer structures: fixed insulation package (SCB type) and unpackaged winding structure. From the perspective of the relative position of the high and low voltage windings, there are two types: concentric and overlapping. The concentric structure is simple and easy to manufacture. Most dry-type transformers use this structure. The overlapping type is mainly used to manufacture special transformers.

The structure of dry type cast resin transformer:

1. Open type: It is a common form, its body is in direct contact with the atmosphere, and is suitable for relatively dry and clean indoors (when the ambient temperature is 20 degrees, the relative humidity should not exceed 85%). There are generally two cooling methods: air self-cooling and air cooling.

2. Enclosed type: The device is located in a closed casing and does not directly contact with the atmosphere (due to poor sealing and heat dissipation conditions, it is mainly used in mines and belongs to explosion-proof type).

3. Casting type: epoxy resin or other resin is used as the main insulation, with simple structure and small volume, suitable for transformers with small capacity.

Dry type cast resin transformer manufacturers believe that dry-type transformer cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). In the process of natural air cooling, the transformer can run continuously at the rated capacity for a long time. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, and it is not suitable to maintain continuous overload operation for a long time.

Types of dry type cast resin transformers:

1. Impregnated air-insulated dry-type transformers: rarely used at present. Different heat-resistant insulating materials are selected for wire insulation and insulating structural materials according to needs, and dry-type transformers with B, F, and H insulation are made.

2. Epoxy resin cast dry-type transformer: polyester resin and epoxy resin are used as insulating materials. At present, epoxy resin is widely used in cast-insulated dry-type power transformers.

3. Wrap-insulated dry-type transformer: Wrap-insulated dry-type transformer is also a kind of resin insulation, and there are few manufacturers at present.

4. Composite insulated dry-type transformer:

(1) The high-voltage winding is cast, and the low-voltage winding is impregnated;

(2) The high voltage adopts the casting type, and the low voltage adopts the foil winding made of copper foil and aluminum foil.

The above are some knowledge points about dry type cast resin transformers. I hope you can study and understand the relevant knowledge carefully, choose products and equipment that suit your needs, and ensure your own benefits. If you want to know more details, you can contact us, I believe we can give You are very satisfied with the answer.