Ventilation

 Ventilation
When designing the ventilation in the transformer´s room, it must be taken in account its
loosses: Pt Wo + Wcc
These losses are manifested as heat, modifying the ambient temperature of the room. The
standards IEC 60726 – IRAM 2276 set the Dry Transformers´ normal conditions of service.
For an altitude above 1000m above sea. The cooling air´s temperature wont be in any
case above 40°C nor less than -25°C for outdoors transformers or 5°C for indoor
transformers.
•
•
30° C for average daily temperature
20° C for average anual temperature
The most simple and reliable solution is to
achieve a natural ventilation of the room,
allowing the entry of fresh air in the bottom
and an exit in the opposite top. If the natural
ventilation was insufficient, fans could be
installed increasing this way the airflow
keeping the environmental conditions within
the standards.
Natural Ventilation
H
Flow Calculation
In order to calculate the required airflow and the size
of the openings in the rooms, there will be used the
following expresions, taking 15°C as the difference
between the incoming and otucoming air.
S = 0,22 .
PT
Q = 3,5 . PT
H
PT: Total disipated losses at 75 °C [kW]
Q: Flow of renewal air [m3/min.]
S: Net area of the upper and lower openings [m2]
Argentine made products with international quality standards.
Forced Ventilation
Ventilation
Further, the air temperature wont be in any case above: