Epoxy resin dry-type transformers from TAILI Electric, is difference from oil type transformer is that it must be installed inside with the core and winding are not impregnated in insulating oil, are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and equipment, etc. Its cooling method can be divided into natural air cooling (AN) and forced air cooling (AF). With natural air cooling, the transformer can operate continuously at rated capacity for a long period of time. With forced air cooling, the transformer output capacity can be increased by up to 50%. It is suitable for intermittent overload operation, or emergency accident overload operation; because of the load loss and impedance voltage increase during overload, it is in non-economic operation, so it should not be in long time continuous overload operation.