Three Phase Dry Type Transformer

Three phase dry type transformer

The three phase dry type transformer is used in three-phase power systems to utilize air or another gas, not liquid, for cooling or insulation. Three phase dry-type transformers function like any other three phase transformer, stepping up or down the voltage as required. The transformer has three sets of windings on both the primary and secondary sides. It is designed to transfer electrical energy between circuits in a three-phase AC (alternating current) system, providing stable and device-safe electricity to consumers. Compared with oil-filled transformers, It is typically more compact and lightweight, making them easier to install and transport.

Types of dry-type transformers

Cast Resin Dry-Type Transformer
In this type, the windings are coated with a layer of epoxy resin. This provides insulation, aids in heat dissipation, and offers protection from environmental conditions like dust and moisture.
Vacuum Pressure Impregnated (VPI) Dry-Type Transformer
For these transformers, the windings are vacuum-impregnated with a varnish that provides insulation and environmental protection. After impregnation, the transformer is cured in an oven.

Three Phase Dry Type Transformer Construction

Three phase dry-type transformers mainly have these components: a magnetic core (usually made from silicon steel) , windings (typically made from copper or aluminum), enclosure (to protect the transformer from the environment, cooling system (typically air-cooled), and terminals.

Three phase dry type transformer specification

Three phase dry type transformer working principle

The three phase dry-type transformer operates based on the principle of electromagnetic induction, which states that a change in the magnetic field within a coil of wire induces a voltage across the ends of the coil. The three windings on the primary side are fed by a three-phase supply and produce a magnetic field that induces a voltage in the secondary windings. The phase difference of 120 degrees between each phase in the input is preserved in the output.

Advantages of three phase dry type transformer

1. Safety: Dry-type transformers are self-extinguishing and have a higher fire safety rating compared to oil-filled transformers. They do not pose a risk of oil leaks or spills, making them safer for installations in buildings and sensitive areas.
2. Environmental Friendly: Since dry-type transformers do not contain oil, they do not pose a risk of oil spills or contamination and can be installed in areas where environmental protection is a concern.
3. Resilience to Harsh Conditions: The cast resin dry-type transformers are highly resistant to harsh environmental conditions, such as high humidity or corrosive atmospheres. They are often used in outdoor applications or industrial environments.
4. Low Maintenance: Dry-type transformers do not require regular oil testing, filtering, or replacement, resulting in lower maintenance costs and downtime.
5. Installation Flexibility: They can be installed closer to the load, even indoors, because they do not require a dedicated oil containment area.
6. High Efficiency: Dry-type transformers are designed to be highly efficient, with low no-load losses and operational costs.

Application of three phase dry type transformer

The three phase dry-type transformer is widely used in various applications due to its safety, environmental benefits, and installation flexibility, such as commercial buildings, renewable energy systems, data centers, public utilities, industrial applications, urban installations, etc. This transformer suits our company’s nail making machines, wire drawing machines, thread rolling machines, and other products due to its safety and durability in harsh conditions. It is resistant to dust, moisture, and corrosive environments.

Three phase dry type transformer price

The three phase dry type transformer price is USD 1000-3000. The price can vary depending on the application’s specific requirements, including power rating, voltage levels, frequency, and environmental conditions. Please get in touch with us for a detailed quotation.