Industry News

What is the difference between a dry-type transformer and an oil-immersed transformer?

2025-06-03

There are many types of transformers, such as dry-type transformers, oil-immersed transformers, etc. So what is the difference between these two transformers?

Transformers

First of all, their appearance is different. 


The oil-immersed transformer is fully encapsulated and has a complete shell, while the dry-type transformer can directly see the internal parts structure. 


The casing materials of the two are also different. 


The main lead material used in dry-type transformers is silicone rubber. 


Oil-immersed transformers cannot use silicone rubber due to oily substances, and mostly use porcelain leads. 


Their scope of use is also different. 


The capacity of dry-type transformers is relatively small, and the capacity range of oil-immersed transformers is wider, and they can also be used for high-voltage construction. 


Their insulation methods are also different. 


The insulation method used by dry-type transformers is resin insulation, which relies on air cooling for heat dissipation. 


Due to the different insulation methods, their heat dissipation methods are also different. 


Oil-immersed transformers rely on oily substances for insulation and heat dissipation. 


These two methods have their own advantages and disadvantages. 


Their places of use are also different. 


Dry-type transformers are generally used in indoor places. 


Dry-type transformers are generally used in various buildings, and oil-immersed transformers are mostly used in outdoor places.

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