Dry type transformer cooling system
Aug 13, 2020
Due to the relatively large work and power of dry-type transformers, the heat of dry-type transformers is also relatively high, sometimes exceeding the temperature carried by dry-type transformers. When the temperature of the dry-type transformer is high, the temperature must be lowered. Dry-type transformer cooling also has a certain cooling system.
In the first case, the dry-type transformer has no protective casing.
Dry-type transformers have no protective casing, or although there are protective casings, but the cooling air can enter the internal circulation through the surgery dry-type transformer. The cooling method of this type of transformer is represented by only two words: a letter represents air, represented by A; the second letter is represented by N or F, N represents natural circulation, and F represents forced circulation.
For example, AN represents a self-cooling dry-type transformer. The cooling air can circulate both outside and inside the transformer. AF means air-cooled. The lower part of the coil of the dry-type transformer is provided with an air duct, and a cooling fan is used to blow air to improve the heat dissipation effect.
In the second case, the dry-type transformer has a protective shell
The dry-type transformer has a protective shell, and the cooling air cannot enter the internal circulation through the shell. For this dry-type transformer, four letters are used to indicate the cooling method. The sequence is:
1) The letters indicate the type of cooling medium in contact with the coil. The letter A represents air, and the letter G represents other cooling gases, such as nitrogen.
2) The second letter indicates the type of circulation of the cooling medium (gas) in contact with the coil, the letter N indicates natural circulation, and the letter F indicates forced circulation (such as a fan)
3) The third letter represents the type of cooling medium that is in contact with the external cooling system, the letter A represents air, and the letter G represents other cooling gases.
4) The fourth letter indicates the circulation type of the cooling medium in contact with the external cooling system, the letter N indicates natural circulation, and the letter F indicates forced circulation
