Everything You Need To Know about Dry-Type Transformers
A transformer is one of the most vital components used in electric devices & systems. Dry type transformers are extensively used in various commercial, utility as well as industrial applications due to their wide range of benefits. The growing technological advancements in this type of transformers are going to make electrical devices more efficient in the coming years.
When it comes to electric devices, there are numerous small components integrated together for the smooth functioning of the device. Transformer is one of the most vital component used in electric devices. A transformer in an electric circuit that does the work of increasing or decreasing voltages/currents. Transformers come in various types, among which “Dry Type Transformers” are highly used owing to various benefits they offers such as low-cost, high efficiency, and enhanced safety.
What are Dry-Type Transformers?
A dry-type transformer does not have any rotating parts; it is a motionless device that utilizes eco-friendly temperature insulation systems. This type of transformer is also named as “cast resin type transformers”. It is used in various commercial, industrial, as well as utility applications.
Conventional liquid-type transformers are dependent on materials such as fire or oil resilient liquid dielectric. A dry type transformer is termed as “voltage changing,” which signifies that in this type the air gets cooled rather than cooling the liquid. The case in which the transformer is placed has proper ventilation; hence proper ventilation results in cooling of coils due to the air inside the case.
Dry-type transformers, unlike conventional liquid transformers, are not required to be kept inside catch basins or fire resistant vaults, and no toxic gases are released from them. As dry-type transformers are highly safe, they can be installed indoors as well as nearby loads, making the whole system more competent.
What are the Uses of Dry Type Transformers?
Dry-type transformers are generally used in small as well as medium-voltage applications in electric devices, and are perfect for the industrial, utility, and commercial applications. Moreover, they have copper or aluminum windings that are covered with varnish.
Applications of Dry Type Transformers
- Various industries such as chemical, gas, and oil use dry type transformers.
- Water protection areas which are environmentally sensitive use dry type transformers.
- Dry type transformers also find applications in forest areas.
- Dry type transformers are used in substations of interior cities.
- Both indoor as well as underground substations use dry type transformers.
Advantages of Dry Type Transformers
- Dry type transformers are environment friendly, as they do not create pollution by releasing toxic gases.
- They find applications in contaminated and damped areas
- Their installation process is easy.
- The dielectric heating & low thermal properties of dry type transformer make them durable.
- They are safe for both people as well as surroundings.
- They have high resistance, which helps them mange short circuit currents.
- They have low side clearance and offer excellent performance.
- They are capable of handling overloads with the help of their high capacity.
Types of Dry Transformers
There are numerous types of dry-type transformers available in the marketplace. The growing innovations in the types of dry type transformers is boosting the global market for dry type transformers at the CAGR of 6.1% from 2020 to 2027, states a research report by Research Dive.
Some of the types of Dry Type Transformers are:
1. Vacuum Pressure Impregnated (VPI) Transformers
This type of transformers are usually used for industrial as well as commercial purposes. They come with an extreme-temperature insulation ranking in the range of ‘O’ and ‘K’ fluid classifications. This type of transformers are built from components that can bear high temperature and moisture-resilient polyester sealant that is usually applied with a vacuum pressure impregnation method.
2. Vacuum Pressure Encapsulated (VPE) Transformers
Vacuum pressure encapsulated transformers are similar to VPI transformers. However, rather than polyester they are developed using a silicon-based resin. This resin develops a thicker varnish that is extremely resilient to salt, moisture, and high humidity, making it an ideal option for harsher atmospheres. They are used in application areas that are vulnerable to alkalis, chlorides, and acids.
3. Open Wound Transformers
Open wound transformers are named so because of their manufacturing procedure, which contains the “dip-and-bake” process. In this process, the coils are heated and dipped in high-temperature varnish and then baked.
4. Cast Coil Transformers
Cast coil transformers are trustworthy even in harsh environmental conditions and hardly need any maintenance. They are usually seen inside buildings, tunnels, offshore platforms, onboard ships, mining services, production plants, and nuclear plants.
The Bottom Line:
Be it commercial, residential, or industrial applications, dry type transformers are going to be an integral part of the electric systems. Moreover, continuous technological developments along with growing focus toward the replacement of traditional insulated systems are like to surge the demand for dry-type transformers and propel the growth of the dry type transformer industry in the coming years.
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