Siemens GEAFOL Neo Operating Manual page 24

8. Operation
8.5 Transformer overload operation shall be in accordance with IEC 905 Load Guidelines for Dry-type
Power Transformers, allowing short-term overload. The following table shows the permissible overload
time curves at ambient temperatures of 40 ºC, 30 ºC, 20 ºC, 10 ºC.
8.6 The three-phase voltage, current and temperature values shall be recorded periodically during the
operation of the transformer so that the historical data of the transformer can be consulted in case of
overhaul or fault.
Note:
Above are the overload curves of the transformer under natural-cooling condition. The design of overload capacity of the transformer is not
the same because of the different needs of users.
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Overload curve of SIEMENS GEAFOL® CRT (without cooling fans)