A dry-type transformer is a type of transformer that never utilizes any insulating liquid with liquid immersion and winding. The windings and core are kept within a sealed tank with air pressure.
Therefore, this transformer is non-hygroscopic. It is a transformer made available in ratings of 25 KVA to 12,500 KVA with an insulation class of 90 C Temp. 

Featured Advantages of this type of transformer: 

•    They offer better overload capacity
•    They provide low partial discharge with low loss and hence provide good efficiency.
•    It is non-inflammable winding insulation that offers zero risk to fire hazards. That is why it suits indoor installation. 
•    It can be fitted outdoors in IP 45 enclosure. 

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Vacuum Pressure Encapsulated Transformer (VPE) 

This transformer is made up of Si-based resin instead of polyester. Such transformers generate extremely thick varnish that is extensively resistant to humidity, salt, and others. These are utilized for harsher environments application. 

Cast Coil Transformer 
Cast coil transformers are consistent in extreme weather conditions, and hence they require very less maintenance. They can also resist high short circuits. That is why they were used at an earlier time when liquid-filled units were available for harsh temperatures. Presently, these are massively used in tunnels, ships, cranes, nuclear plants, and mining industries. 

Open Wound Transformer
An open wound transfer utilized the dip and bake method. It involves heating the coils at first instance, then it is dipped in varnish, and the last step involves baking them. 
Dry Type Transformer Application

Dry-type transformers are widely used in fire-risk areas, chemical, gas, and oil industry, inner-city substations, fire-risk areas, renewable generation, and indoor and underground substations. 

The major players operating in the industry are; Siemens AG, Schneider Electric, General Electric, Tbea Transformer Industrial Group, Hammond Power Solutions, and Voltamp Transformers. 

Therefore, the higher efficiency of dry-type transformers leads to their increased adoption.