Dry Type Transformer

Electrical transformers, which play an important role in power distribution, are classified into many types. In terms of usage purpose, core type, and cooling type, transformers can basically be examined in 3 main groups. According to cooling type, they are divided into two categories: dry type and oil type. Transformers designed with cooling systems that dissipate generated heat via air circulation are called cooled transformers. So, what is a dry type transformer?

What is a Dry Type Transformer?

Dry type transformers are among the cooled transformer types. Transformers whose magnetic core and windings are not protected in an insulating liquid are called dry type transformers. Dry type transformers are completely dry and do not contain any oil. Their windings are insulated against external factors and coated with glass fiber reinforced epoxy resin. Dry type transformers operate either in atmospheric conditions or in gas environments.

Where are Dry Type Transformers Used?

Dry type transformers are widely used in places with high human traffic due to their safety advantages, such as:

• Hospitals, schools, shopping malls, theaters, residential buildings
• Pump stations and underground transformer systems
• Railways and dams
• Industrial facilities and energy plants

Features of Dry Type Transformers

The main features of dry type transformers are as follows:

• High and low voltage windings are manufactured in a closed environment and produced under vacuum using resin casting technology.
• Epoxy resin is used for winding insulation. Epoxy is flame-retardant and self-extinguishing.
• A temperature control system protects windings against overheating.
• Dry type transformers are fire-safe and can quickly extinguish fire in case of ignition.
• They are resistant to short circuits due to their winding structure.
• They are resistant to humidity and can operate even in high-humidity environments.
• They require minimal maintenance.
• If installed in enclosures, they can be safely used in areas with high human presence.

Dry Type Transformer Maintenance

Dry type transformers require less maintenance compared to oil type transformers. Maintenance must be performed according to the manufacturer’s instructions.

Dry Type Transformer Tap Adjustment

Tap adjustment in dry type transformers is specified in detail on the transformer nameplate by the manufacturer. The tap setting can be adjusted according to the required voltage level.