Dry-type and oil-filled transformers: differences and when to use each

Dry-type transformer

A dry-type transformer is an electrical device that performs the same function as a conventional transformer, but without the presence of insulating liquids. Instead, it uses solid insulating materials (such as resins or polymers) to insulate the transformer coils and windings. In this way, they provide greater safety, as it eliminates the risk of oil leaks, in addition to requiring less maintenance. Furthermore, they are more suitable for environments where the presence of liquids may represent a risk of fire or environmental contamination.

Oil-filled transformer

An oil-filled transformer is an electrical device that uses mineral oil as an insulator and coolant within its core. Thus, this oil is used to keep the coils insulated and cool the transformer during operation. Its main advantages are: excellent electrical insulation capacity, high thermal efficiency, and heat dissipation capacity.

What are the main differences between dry-type and oil-filled transformers?

To better understand the main differences between them, we made a comparative table. Take a look.

So, dry-type and oil-filled transformers have significant differences regarding environmental impact, safety, installation cost, installation requirements, maintenance, and price.

While dry-type transformers offer advantages in terms of lower environmental impact, lower fire risk, and more economical installation cost, oil-filled transformers are more affordable.

Therefore, the choice between them depends on the specific needs of the project and environmental and safety considerations.

Dry-type and oil-filled transformers are at Trifásica Elétrica!

So, visit our official website for detailed information and feel free to contact us at any time. We are here to help you, always!