The cooling method of the transformer is determined by the cooling medium and the circulation mode; since the oil-immersed transformer is further divided into the internal cooling mode of the fuel tank and the external cooling mode of the fuel tank, the cooling method of the oil-immersed transformer is represented by four letter codes.
First letter: Cooling medium in contact with the windings.
O-------- mineral oil or insulating liquid with a burning point greater than 300 ° C;
K--------Insulating liquid with a burning point greater than 300 ° C;
L--------Insulating liquid that is not detectable in the ignition point;
The second letter: the way the internal cooling medium is circulated.
N--------The oil flow through the cooling device and inside the winding is a natural heat convection cycle;
F--------The oil flow in the cooling device is forced circulation, and the oil flow flowing through the inside of the winding is a heat convection cycle;
D--------The oil flow in the cooling device is forced circulation, at least the oil flow in the main winding is a forced guiding cycle;
The third letter: external cooling medium.
A--------air;
W--------water;
Fourth letter: The way the external cooling medium is circulated.
N-------- natural convection;
F-------- Forced circulation (fans, pumps, etc.).
The ONAN cooling method is a natural convection cooling method of the internal oil, that is, the so-called oil immersed self-cooling type.
ONAF: oil immersed forced air cooling
OFAF: Forced oil circulation forced air cooling
ODAF: Forced oil-directed circulation forced air cooling
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