A dry type transformer is defined as a transformer that uses air or gas—instead of liquid—as the insulating and cooling medium for its windings and core, all contained within a pressurized sealed tank.
Dry type transformers are widely used in various industries and applications because of their safety, reliability, and environmental benefits. They can operate in harsh conditions such as high humidity, fire risk, and seismic events without compromising their performance or posing any hazard to people or property.

Advantages of Dry Type Transformers
Some of the main advantages of dry type transformers are:
- Dry transformers enhance safety by eliminating flammable or toxic liquids, reducing the risk of leaks or fires.
- They are maintenance-free and pollution-free because they do not require any oil changes, oil tests, oil spills cleanup, or special disposal methods.
- They are easy to install because they do not require any vaults or special foundations. They can be placed close to the load to reduce the need for long and costly low voltage cables.
- They are environmentally friendly because they do not emit any harmful gases or contribute to the greenhouse effect.
- These transformers excellently handle overloads due to their superior heat dissipation and thermal endurance compared to oil-filled types.
- They have reduced costs on civil installation works and fire protection systems because they do not need any oil containment pits, fire walls, fire extinguishers, or sprinklers.
- They have excellent performance in the case of seismic events because they have a rigid structure that can withstand vibrations and shocks.
