Dry-type transformers are widely used in places like local lighting, high-rise buildings, airports, and CNC machinery at ports. Simply put, a dry-type transformer is one whose core and windings are not immersed in insulating oil.
Cooling methods include natural air cooling (AN) and forced air cooling (AF). Natural air cooling allows the transformer to operate continuously at rated capacity for extended periods. Forced air cooling increases the transformer's output capacity by 50%. These transformers are suitable for intermittent overload operation or emergency overload conditions. However, due to the significant increase in load loss and impedance voltage during overload, which results in uneconomical operation, they should not be subjected to prolonged continuous overload operation.
The safe operation and service life of a dry-type transformer depend largely on the safety and reliability of the transformer winding insulation.
Dry-type transformers have two cooling methods: natural air cooling (AN) and forced air cooling (AF). Natural air cooling allows the transformer to operate continuously at rated capacity for extended periods. Forced air cooling increases the transformer's output capacity by 50%. It is suitable for intermittent overload operation or emergency overload operation. Since the load loss and impedance voltage increase greatly during overload, it is in a non-economic operation state, so it should not be kept in long-term continuous overload operation.