Dry - type transformer cooling method

conventional type transformer cooling method is divided into natural air cooling (AN) and forced air cooling (AF). Natural air cooling, the transformer can be rated capacity under long-term continuous operation. Forced air cooling, the transformer output capacity can be increased by 50%. It is suitable for intermittent overload operation or emergency overload operation. Because overload and load voltage and impedance voltage increase greatly, it is in non-economic operation state, so it should not make it run continuously for a long time.