What do AN and AF on the transformer nameplate mean?

Problem description:
What do AN and AF on the transformer nameplate mean?

Product Line:
Trihal Dry Type Transformer

Solution:
There are two cooling methods for dry - type transformers, namely AN method, i.e. air self - cooling; and AF method, which starts the fan for forced air cooling. When the Trihal dry - type transformer is connected to an external fan, forced ventilation (AF method) is activated when the coil temperature reaches 100°C, and the fan power is cut off when the temperature reaches 80°C. The above temperature setting values can be adjusted according to the on - site operating conditions.