The transformer industry produces a variety of transformers, each with its own set of characteristics and features that fulfill specific functions. One such transformer is the dry type transformer.
Distribution transformers provide safe voltage levels for power usage. However, they are frequently found in heavily populated places or adjacent to vulnerable ecosystems. Using oil-filled transformers in such regions may endanger persons and the environment by causing fires and oil leaks. In such instances, dry-type transformers are the better option. These transformers are used to step down the voltage levels in different industries. Customers are increasingly requesting dry-type transformers to reduce environmental contamination and fire dangers. This guide shares everything you need to know about this type of transformer.
What is a Dry Type Transformer?
This transformer is an electrical equipment that employs air or gas as an insulating medium rather than liquid or oil. It is also known as an air-core transformer or cast resin type transformer. Dry transformers differ from their liquid or oil-filled equivalents. These transformers rely on natural air convection or fans for cooling, feature resin-encased or VPI windings.
Dry type transformers are more efficient and durable than oil-filled transformers since no liquid can leak or catch fire. Also, these transformers are easier and less expensive to maintain because the oil does not need to be checked or changed on a regular basis.
They are also smaller and lighter in weight than oil-filled transformers with the same power rating. They step down voltage by using fewer turns in the secondary winding than in the primary winding.
When employing a dry transformer, you do not need to store it in fire-resistant vaults or catch basins, as you would with traditional liquid transformers. They emit no toxic gases, which makes them ecologically benign, especially for indoor installations.
The Working Of Dry Type Transformers
Cast-resin type transformers employ electromagnetic induction to move electricity from one circuit to another. The transformer is made up of two coils, one primary and one secondary, which are wrapped around a common magnetic core. An alternating current travels through the primary coil, which creates a magnetic field surrounding the core. This magnetic field creates a current in the secondary coil, which is linked to the load. The transformer’s output voltage is governed by the ratio of turns in the primary and secondary coils.
Dry type transformers do not utilize oil as a cooling medium and instead use air to disperse the heat generated by the transformer. This is accomplished by a mix of forced air and natural convection cooling. The transformer windings are sealed with epoxy resin, which offers insulation and protection against moisture, dust, and other impurities. The resin also helps to disperse heat, which reduces the risk of fire.
Where are dry transformers used?
Dry transformers are ideally suited for industrial, commercial, and even utility applications. This is because they can easily handle both low and medium voltage requirements. They are used in hospitals, shopping malls, hotels, schools, manufacturing plants, refineries, mines, railways, and airports.
Benefits of a Dry Type Transformer
Self-extinguishing, low fire risk.
A dry-type transformer’s insulation is made of an environmentally acceptable substance. So it pleasantly winds in a self-extinguishing way, is flame retardant, and, of course, simple to maintain. It eliminates the need for a fire extinguisher. Even when arcing occurs, no harmful gasses are produced.
Zero oil consumption
As previously stated, the dry transformer does not require any liquid to cool. It merely needs air to stay cool. As a result, you will not have to pay extra for oil or any other liquid, as well as the associated maintenance expenditures. It is safe to state that this transformer requires practically no maintenance, so you can rest easy.
Low Installation Cost
Dry type transformers are low-risk and need minimal installation constraints. This means fewer load losses and cheaper installation costs. You will also not have to deal with additional environmental concerns, such as groundwater conservation. Furthermore, these transformers have a low failure rate and can last for more than 20 years.
Eco-Friendly and Safe
Dry transformers do not utilize oil or liquids, hence there will be no oil leaks. Or any other type of environmental pollution. Plus, they are self-extinguishing, which means they seldom burst. Also, dry type transformers are well-known for their ability to tolerate unexpected weather changes. This makes them ideal for highly polluted and confined settings.
Needs Low Maintenance
Dry type transformers require very little maintenance. As if you scarcely have to maintain them. You won’t have to worry about dirt buildup as long as they have air to cool. Additionally, you will never have to worry about liquid testing. However, a routine expert checkup is suggested, and it should not be too difficult.
Conclusion
Amson Transformers is one of the top dry type transformer manufacturers that offer customized products according to the needs of consumers. We provide a variety of high-quality transformers for a wide range of applications and industries. Also, we have been in the transformer industry for many years, and our knowledge and ability are unmatched.
Frequently Asked Questions
Q. Can Dry Transformers Be Used Outside?
Ans. Yes! Dry type transformers can be utilized both indoors and outdoors due to the following characteristics:
- It’s not flammable.
- It is not hygroscopic.
- It may be installed inside an IP45 enclosure.
They are often stored in a vault, atop a pole, or underground. That way, they’re safe from the weather and other conditions.
Q. How are dry type transformers cooled?
Ans. Dry-type transformers are cooled in two ways: self-cooling and forced cooling.
The most popular cooling method is self-cooling, which is utilized on small to medium-sized transformers. The surrounding air cools the transformer, thus they are frequently equipped with fans to circulate the air.
Forced cooling is utilized for bigger transformers that produce greater heat. The transformer is cooled with a liquid, usually water or oil. The liquid is circulated to the transformer to reduce heat.
Q. What is the difference between an oil-filled and a dry type transformer?
Ans. The fundamental difference between both is in their cooling and insulating medium. Dry-type transformers utilize air or solid materials (like epoxy resin) as an insulation medium whereas oil-filled transformers use a type of dielectric oil (such as mineral, silicone, or vegetable oil) to dissipate heat and provide insulation.