Oil transformer and dry-type transformer cooling methods are mainly natural cooling and forced air-cooled two, the following detailed comparison.
For oil transformer:
* Natural cooling (ONAN): This method mainly relies on the radiation of the tank wall and radiator (dry-type transformer without tank) as well as the natural convection heat dissipation of the air around the transformer. When the temperature of the transformer rises above the temperature of the surrounding air, the hot air will naturally escape and be replaced by cold air. This method is mainly used for smaller capacity transformers within 30 MVA.
* Forced air cooling (OFAF): When the capacity of the transformer increases and natural air convection is not sufficient to meet the cooling requirements, forced air cooling can be used. This method cools the transformer by pressurizing air in the transformer and is usually used for transformers larger than 30 MVA.
For dry-type transformers:
* Natural Cooling: Similar to the natural cooling of oil transformers, dry-type transformers are cooled in this way, relying mainly on the natural convection of the air around the transformer to dissipate heat.
* Forced air cooling: When the capacity of the dry-type transformer increases or a higher cooling efficiency is required, forced air cooling can also be used. This way of cooling through pressurized air in the transformer to improve the cooling effect.
In summary, the cooling methods of oil transformers and dry-type transformers are similar in principle, but the specific realization may vary depending on the type and capacity of the transformer. In practical application, it is necessary to choose the appropriate cooling method according to the specific needs and conditions of the transformer.
