In the context of a transformer, what are self-heating and ambient temperature?
The level of self-heating depends on the load and the cooling. A higher load leads to stronger development of heat. On the other hand, a sealed transformer with the same structure has faster heat dissipation through the sealing material and enlarged surface and heats up to a significantly lower extent than a transformer of open design. If a transformer is used in a higher ambient temperature than specified, the output voltage, the output current and thus the output power drop.
