What Is the Difference Between a Dry-Type vs Oil-Type Transformer?

Many businesses in the heavy equipment industry need to face the decision of which type of transformer to purchase for their operations. Dry-Type Transformers and Oil Filled Transformers are both considered, though it is important to understand the differences between them before making a decision. 

What Is a Dry-Type Transformer?

A dry type transformer is a type of power transformer that does not use oil for cooling, instead relying on air or other gasses to dissipate the heat produced by electricity passing through it. Also known as a cast resin transformer, it uses a varnished copper or aluminum winding to provide insulation between the windings, instead of relying on oil as an insulator. Their maximum voltage is restricted to 35 Kv

What Is an Oil-Filled Transformer?

An oil-filled transformer is a type of power transformer that uses mineral oil or other hydrocarbon liquids for cooling and insulation. This type of transformer has been in use for many years and is highly reliable. This type of transformer has some advantages compared to dry type transformers, such as having a higher power capacity and lower noise levels. They can also be used for higher voltage ratings as well.

Which Is Better in Terms of Efficiency?

Due to their insulation method, dry-type transformers are more efficient than oil-filled types due to fewer energy losses from the transformer itself. This is due to the dry type’s lack of liquid insulation, which can lead to energy losses from evaporation or leakage. Additionally, dry type transformers are also less likely to require maintenance over the long term, as they do not need their oil levels or chemical contamination checked or replaced periodically as an oil-filled transformer would.

Dry-Type Transformers Offer Flexibility Too

These types of transformers can be used inside and set up either in a closed or open space. This is because they are not exposed to environmental elements like oil-filled transformers, which means that there are no emissions or potential for fires due to leakage. Dry-type transformers also take up less space than their oil-filled counterparts, making them ideal for tight spaces or where limited airflow is available.

If you would like more information on which type of transformer would be best for your business, contact our experienced team. We can help you select the right type for your specific application and get it up and running in no time. 

We will provide you with tailored advice on what kind of transformer is best for you and how to ensure that it operates safely and efficiently. 

This post was written by Justin Tidd, Director at For nearly a half a century, Becker Mining has been at the forefront of mining transformers Becker/SMC is the industry’s leader in increasingly more sophisticated electrical control systems. Most of the major innovations, design features and specialized electrical components have been developed by Becker/SMC.

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