Dry Type Transformer Manufacturer
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CHBEB is one of the professional transformer manufacturers in China, specializing in high-quality dry type transformers for diverse industrial and commercial applications. As a leading China-based transformer factory, our company designs and manufactures transformers in various capacities and configurations to meet different customer requirements. We also offer tailored solutions to ensure reliable performance and safety in demanding environments. Contact us today to request a free quote or more information.
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All You Need to Know About Dry type transformer
Dry type transformers use air or gas for insulation and cooling instead of oil, offering safety and environmental benefits. They’re ideal for indoor or fire-sensitive areas because they operate without flammable liquids.
These transformers are reliable and low-maintenance, making them popular in commercial and industrial settings. However, they’re less suited for very high voltages, and factors like overloading or poor ventilation can impact performance.
This article covers dry type transformer components, buying considerations, pros and cons, and types. For more details, explore our full blog post.
Advantages of Dry type transformer
Environmentally Friendly
Dry type transformers don't use oil. This makes them safer for the environment. There's no risk of oil leaks or spills.
Fire Safety
These transformers have a lower fire risk. They use non-flammable materials. This makes them ideal for indoor use in buildings.
Low Maintenance
Dry type transformers need less maintenance. They don't require oil checks or changes. This saves time and money over time.
Compact Size
These transformers are often smaller than oil-filled types. They can fit in tight spaces. This is useful in buildings with limited room.
Quiet Operation
Dry type transformers are usually quieter. They don't have noisy cooling fans. This makes them good for use in offices or hospitals.
High Short-Circuit Strength
These transformers can handle short circuits well. Their design gives them good mechanical strength. This increases their reliability in tough conditions.
How Do Dry type transformer Work?
Dry type transformers work on the principle of electromagnetic induction. They have a core made of magnetic material and two sets of windings. The primary winding receives electrical energy. It creates a changing magnetic field in the core. This field then induces voltage in the secondary winding. Unlike oil-filled transformers, dry types use air for cooling and insulation. The windings are typically made of aluminum or copper. They are covered with special insulating materials. These materials can withstand high temperatures. Heat is dissipated through natural air circulation or forced air cooling. The entire assembly is enclosed in a protective case. This case allows air flow while protecting the internal parts. Dry type transformers are designed to operate efficiently without the need for liquid coolants.
What Are Dry type transformers Transformers Used For?
Dry type transformers are widely used in various applications due to their safety and reliability. They are ideal for indoor installations where fire safety is crucial. Office buildings, hospitals, and schools often use these transformers. They are also common in industrial settings like factories and processing plants. Dry type transformers work well in areas with high moisture or dust, such as mines or coastal regions. They are popular in renewable energy projects, especially wind farms. Shopping malls and residential complexes use them for their low maintenance needs. Data centers prefer dry type transformers for their reliability and compact size. These transformers are also used in marine applications on ships and offshore platforms. Their environmentally friendly nature makes them suitable for green building projects
Design and Planning
Engineers design the transformer using computer software. They consider factors like voltage, power needs, and size requirements.
Core Production
Workers make the core from thin steel sheets. They cut and stack these sheets to form the magnetic circuit.
Winding Fabrication
Technicians create windings using copper or aluminum wire. They insulate the wire and wind it around a form.
Insulation Application
Workers apply special insulation to the windings. This insulation can withstand high temperatures and provides electrical protection.
Assembly of Core and Windings
Technicians carefully place the windings over the core. They ensure proper alignment and connections.
Enclosure Construction
Workers build a protective case for the transformer. This case allows for air cooling while protecting internal parts.
Testing and Quality Control
Technicians perform various tests on the completed transformer. They check for safety, performance, and reliability before shipping.
Dry type transformer Designs: Factors to Consider
#1 Power Rating
The power rating determines the transformer’s capacity. It affects the size of the core and windings. Designers must choose the right rating for the intended use.
#2 Voltage Levels
Input and output voltage levels are important. They influence the number of turns in the windings. Proper insulation is crucial for the chosen voltage levels.
#3 Cooling Method
Cooling is vital for dry type transformers. Options include natural air cooling or forced air cooling. The choice depends on the transformer’s size and load.
#4Core Material
The core material affects efficiency. Silicon steel is common. Designers may choose different grades based on performance needs and cost.
#5 Winding Material
Copper and aluminum are the main options for windings. Each has advantages and disadvantages. The choice impacts cost, efficiency, and size.
#6 Insulation Class
The insulation class determines temperature resistance. Higher classes allow for higher operating temperatures. This affects the transformer’s lifespan and performance.
#7 Environmental Factors
Designers consider where the transformer will be used. Factors include humidity, dust, and altitude. These affect the enclosure design and insulation choices.
#8 Size and Weight
The transformer’s size and weight are important. They affect installation and transportation. Designers must balance performance with physical constraints.
AN (Air Natural)
Natural air circulation provides cooling in this configuration. Ideal for smaller transformers, AN systems rely on convection currents to dissipate heat. The simplicity of this method offers reliability in low-capacity applications.
AF (Air Forced)
Medium-sized transformers often utilize forced air cooling. Integrated fans enhance heat dissipation from windings and core. AF systems offer improved efficiency over natural cooling, allowing for higher capacity ratings.
AFWF (Air Forced Water Forced)
Large dry type transformers benefit from combined air and water cooling. Water circulates through cooling pipes while fans direct airflow over these conduits. AFWF systems provide superior cooling capacity for high-power applications.
Dry Type Transformers By Cooling Method
Dry type transformers use different cooling methods based on their size and application. These methods are classified into three main types:
Supply Dry Type Transformers By Capacity Range
Low Capacity (Up to 500 kVA)
Low capacity dry type transformers serve small businesses and residential areas. These units handle local power distribution needs. They are compact and easy to install in buildings with limited space.
Medium Capacity (501 kVA to 2500 kVA)
Medium capacity transformers cater to larger commercial buildings and small industrial facilities. These units offer a balance between power output and size. They often use forced air cooling for improved efficiency.
High Capacity (Above 2500 kVA)
High capacity dry type transformers support heavy industries and large power distribution networks. These units manage significant power loads. They typically employ advanced cooling systems like AFWF for optimal performance.
Dry Type vs Oil Immersed Transformers
Dry Type Transformer
CHBEB’s dry type transformers use air or solid insulation, eliminating fire hazards and environmental risks associated with oil. Unlike oil-immersed transformers, they require minimal maintenance and are ideal for indoor installations. With robust construction, they ensure reliable performance in commercial, industrial, and high-moisture environments. CHBEB’s transformers are favored for their safety and low environmental impact, making them perfect for applications where dependable, eco-friendly power distribution is essential.
Oil Immersed Transformers
CHBEB’s oil immersed transformers use oil for cooling and insulation, ensuring efficient heat dissipation and high capacity for demanding applications. Unlike dry type transformers, they are suited for outdoor installations, minimizing electrical losses and preventing internal arcing. Regular oil maintenance is required to ensure optimal performance, and careful handling prevents environmental hazards from leaks. CHBEB’s transformers are favored for their cost-effectiveness and reliability in industrial and utility settings where superior cooling is critical.
Dry Type Transformers By Core Material
Manufacturers group dry type transformers by winding and core materials, each offering unique benefits.
Copper windings
offer high conductivity, low losses, and excellent heat dissipation but are more expensive.
Aluminum windings
are lighter and cost-effective but require larger cross-sections and have lower conductivity.
Amorphous cores
significantly reduce core losses and improve efficiency, though they cost more and are harder to manufacture.
Material choice depends on budget, size, and performance needs. Copper and amorphous cores suit high-performance applications, while aluminum offers good value for cost-sensitive projects.
Types of dry type transformers
Dry type transformers come in different types. People often see cast resin and vacuum pressure impregnated types.
Cast Resin Dry Type Transformer
This transformer covers the coils with solid resin. The resin blocks water and dirt. It has strong fire safety. It often works in buildings, malls, and hospitals.
Vacuum Pressure Impregnated Dry Type Transformer
This transformer uses varnish to coat the coils. Makers put varnish on under heat and vacuum. It cools well and makes less noise. It fits many factories and plants.
Common Voltage Classes of Cast Resin Dry Type Transformers
6kV / 10kV / 11kV Series
Suitable for medium-voltage distribution systems such as industrial plants, schools, shopping malls, and residential substations. These transformers typically step down 10–11kV to around 400V for low-voltage power supply.
15kV–24kV Series
Commonly used in renewable energy projects such as wind and solar power systems, or for export to North and South America. These models comply with standards like IEEE and CSA.
33kV / 35kV Series
Designed for higher-voltage applications, these transformers are used in regional substations, industrial zones, airports, railways, and other large-scale infrastructure projects.
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CHINA BEI ER BIAN (CHBEB) GROUP, with 218 million in registered capital, originated from Beijing Beierbian Transformer Group. Headquartered in Beijing for R&D, it operates major production bases in Nanjing and Yueqing, producing high-quality products.
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