What is Dry Type Transformer ?

What is Dry Type Transformer ?

Dry Transformer Definition

A dry transformer is defined as a transformer that utilizes air or gas instead of liquid for insulation and cooling. 

Transformer Types

• Cast Resin Dry Type (CRT) transformer

• Vacuum Pressure Impregnated (VPI) transformer

Advantages

• 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 suited for damp and contaminated areas because they have high moisture ingress protection and corrosion resistance.

Disadvantages

• Dry transformers tend to be costlier than oil-filled models with similar power and voltage rating due to higher material and manufacturing costs.

• They are larger and heavier than oil-filled transformers for the same power and voltage rating because they have more air gaps and insulation thickness.

• They are noisier than oil-filled transformers because they have higher magnetostriction and vibration that can produce audible sounds.

Applications

• Chemical

• Environmentally sensitive areas

• Fire-risk areas

• Renewable generation

• Other applications

Performance Factors

• Choice of insulation type

• Selection of winding material

• Regulation

• Life expectancy

• Overloading