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 can be fitted outdoors in IP 45 enclosure. 

Vacuum Pressure Impregnated Transformer (VPI) 
This transformer is made with minimum flammable material as windings insulation. The transformer windings are made in strips or foil in a continuous layer.

The winding is developed from disks, that are connected in parallel or series according to power rating concerning the voltage level.

This transformer comes with numerous advantages such as; high mechanical strength, no temperature fluctuation, void-free insulation, less prone to fire hazards, and easy maintenance. 

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. 

 

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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. 

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