Dry-type transformer manufacturers believe that the structural form of dry-type transformers:
1. Open type: It is a common form. Its body is in direct contact with the atmosphere. It 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. Closed type: The device is located in a closed shell and is not in direct contact with the atmosphere (due to poor sealing and heat dissipation conditions, it is mainly used in mines and is explosion-proof).
3. Casting type: Using epoxy resin or other resin as the main insulation, it has a simple structure and small volume, and is suitable for transformers with small capacity.
Dry-type transformer manufacturers believe that dry-type transformer cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). During the natural air cooling process, the transformer can operate continuously at rated capacity for a long time. When forced air cooling is used, the transformer output capacity can be increased by 50%. It is suitable for intermittent overload operation or emergency overload operation; because the load loss and impedance voltage increase greatly during overload, it is in a non-economic operating state and it is not suitable to maintain continuous overload operation for a long time.
Dry-type transformer manufacturers consider the types of dry-type transformers:
1. Impregnated air insulated dry-type transformer: rarely used at present. For wire insulation and insulation structural materials, different heat-resistant insulation materials are selected according to needs to make B, F, and H-insulated dry-type transformers.
2. Epoxy resin cast dry-type transformer: polyester resin and epoxy resin are used as insulation 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 type of resin insulation, and there are currently very few manufacturers.
4. Composite insulated dry-type transformer:
(1) The high-voltage winding adopts casting type, and the low-voltage winding adopts impregnated insulation;
(2) The high voltage adopts casting type, and the low voltage adopts foil winding made of copper foil and aluminum foil.
The above are some knowledge points about dry-type transformers. I hope everyone 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 some advice. You are very satisfied with the reply.
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