Dry transformers are widely used in local lighting, high-rise buildings, airports, terminals, CNC machinery and equipment and other places, simply said dry transformers refers to the iron core and winding is not impregnated in insulation oil transformer.
Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When air cooled naturally, the transformer can run continuously for a long time under the rated capacity. When forced air cooling, the transformer output capacity can be increased by 50%. 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, so it should not be kept in continuous overload operation for a long time.
Structural characteristics Because the dry transformer has the advantages of strong short-circuit resistance, small maintenance workload, high operation efficiency, small volume, low noise, it is often used in places with high performance requirements such as fire prevention and explosion protection. 1. Safe, fireproof, pollution-free, can be directly operated in the load center; 2. Using domestic advanced technology, high mechanical strength, strong short-circuit resistance, small partial discharge, good thermal stability, high reliability, long service life; 3. Low loss, low noise, obvious energy-saving effect, maintenance-free; 4. Good heat dissipation performance, strong overload capacity, can improve capacity operation when forced air cooling; 5. Good moisture resistance, adapt to high humidity and other harsh environment operation; 6. Dry transformer can be equipped with perfect temperature detection and protection system. The intelligent signal temperature control system can automatically detect and display the working temperature of the three-phase winding, automatically start and stop the fan, and have alarm, trip and other functions. 7. Small size, light weight, less space, low installation cost.
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