Structural characteristics of dry-type transformers

Due to the advantages of strong short-circuit resistance, small maintenance workload, high operating efficiency, small size, and low noise, dry-type transformers are often used in places with high performance requirements such as fire prevention and explosion protection. [7]
1. Safety, fire prevention, no pollution, can run directly in the load center;
2. Adopt domestic advanced technology, high mechanical strength, strong short-circuit resistance, small partial discharge, good thermal stability, high reliability and long service life;
3. Low loss, low noise, obvious energy saving effect, maintenance-free;
4. Good heat dissipation performance, strong overload capacity, and can increase capacity operation when forced air cooling;
5. Good moisture-proof performance, suitable for operation in high humidity and other harsh environments;
6. Dry-type transformers can be equipped with a complete temperature detection and protection system. The intelligent signal temperature control system is adopted, which can automatically detect and display the working temperature of the three-phase windings, and can automatically start and stop the fan, and has functions such as alarm and trip;
7. Small size, light weight, less space occupation, low installation cost.
iron core
The high-quality cold-rolled grain-oriented silicon steel sheet is adopted, and the iron core silicon steel sheet adopts a 45-degree full oblique joint, so that the magnetic flux passes along the joint direction of the silicon steel sheet.
Winding form
⑴ Winding;
⑵ Epoxy resin plus quartz sand filling and pouring;
(3) glass fiber reinforced epoxy resin casting (ie thin insulation structure);
(4) Multi-strand glass fiber impregnated with epoxy resin winding type (generally 3 is used, because it can effectively prevent the poured resin from cracking and improve the reliability of the equipment).
High voltage winding
Generally, a multi-layer cylindrical or multi-layer segmented structure is adopted.