HUARUI is a professional dry type transformer manufacturer and supplier in China, providing three-phase dry-type distribution transformers for industrial facilities, commercial buildings, data centers, infrastructure, renewable energy projects and utility power distribution.

Our dry type transformer range mainly includes SCB10 and SCB13 cast resin dry type transformers, using solid insulation and air cooling instead of transformer oil. Available configurations cover different capacities, voltage ratios, winding materials, cooling methods and enclosure requirements to meet project-specific power distribution needs.

HUARUI dry type transformers are suitable for installations where fire safety, low maintenance, compact installation and environmental protection are important considerations.

HUARUI Cast Resin Dry Type Transformers

Our current dry type transformer portfolio focuses on three-phase epoxy resin cast transformer technology.

SCB10 Cast Resin Dry Type Transformer

SCB10 series transformers are designed for reliable general-purpose power distribution.

The high-voltage windings use an epoxy resin vacuum casting process to form a solid insulation structure, while the low-voltage winding can be manufactured with copper or aluminum conductors according to project requirements.

SCB10 transformers are suitable for applications requiring:

● Reliable indoor power distribution
● Oil-free transformer operation
● Low maintenance requirements
● Good short-circuit resistance
● Compact installation near the load center
● 10 kV or 35 kV distribution systems

Typical applications include factories, commercial buildings, substations, industrial parks and infrastructure projects.

SCB13 Low-Loss Dry Type Transformer

The SCB13 series is designed for projects with greater emphasis on transformer efficiency and reduced operating losses.

It retains the safety and maintenance advantages of a cast resin transformer while using an optimized core and electromagnetic design to reduce no-load and load losses.

SCB13 transformers are suitable for continuously energized distribution systems where long-term electricity consumption is an important consideration.

Typical applications include:

● Data centers
● Hospitals
● Commercial complexes
● Industrial facilities
● Rail transportation
● Renewable energy projects
● Energy-efficient distribution systems

Dry Type Transformer Specifications

HUARUI can manufacture dry type transformers according to the electrical parameters and operating conditions of different projects.

Transformer specifications should be confirmed according to rated load, incoming voltage, output voltage, installation environment, efficiency requirements and applicable project standards.

Why Choose a Cast Resin Dry Type Transformer?

Unlike an oil-immersed transformer, a cast resin dry type transformer does not use transformer oil as the primary insulation and cooling medium.

This provides several practical advantages for indoor and safety-sensitive installations.

Oil-Free and Reduced Fire Risk

The absence of insulating oil eliminates oil leakage and significantly reduces the fire and environmental risks associated with liquid-filled transformers.

This makes dry transformers suitable for installations inside buildings and close to electrical loads.

Lower Maintenance Requirements

Dry type transformers do not require routine oil sampling, oil filtration or oil level inspection.

Routine maintenance mainly focuses on transformer cleanliness, electrical connections, ventilation, temperature monitoring and cooling fans when fitted.

Flexible Indoor Installation

Their compact construction allows dry transformers to be installed in:

● Electrical rooms
● Basements
● Commercial buildings
● Factories
● Data centers
● Transportation facilities
● Other locations close to the load center

Reliable Solid Insulation

Epoxy resin vacuum casting forms a mechanically strong solid insulation structure around the winding.

This helps improve dielectric performance and winding resistance to moisture, dust and short-circuit mechanical stresses.

Natural or Forced-Air Cooling

HUARUI dry transformers can use AN natural air cooling for normal operating conditions or AF forced-air cooling when additional cooling and temporary loading capability are required.

Typical Dry Type Transformer Applications

Dry type transformers are widely selected where indoor safety, reliability and reduced maintenance are priorities.

Industrial Plants

Used to step medium voltage down to plant distribution voltage for manufacturing equipment, motors, production lines and auxiliary electrical systems.

Typical industries include:

● Steel and metallurgy
● Machinery manufacturing
● Chemical processing
● Textile production
● Automotive manufacturing
● Mining facilities

Commercial Buildings

Dry transformers can be located closer to building load centers without the oil containment requirements associated with oil-filled transformers.

Common applications include:

● Shopping malls
● Office buildings
● Hotels
● Residential complexes
● High-rise buildings

Data Centers

Data center power systems require reliable distribution, efficient operation and strict control of fire risks.

Cast resin dry type transformers are therefore commonly used between medium-voltage incoming supplies and downstream low-voltage distribution equipment.

Hospitals and Public Facilities

Oil-free construction makes dry transformers suitable for hospitals, schools, government facilities and other buildings where fire safety and indoor installation requirements are important.

Rail Transit and Transportation

Dry type transformers can be used in:

● Metro stations
● Railway stations
● Airports
● Transportation hubs
● Auxiliary distribution systems

Renewable Energy Projects

Dry transformers can also support photovoltaic, wind power, energy storage and related renewable energy distribution systems, particularly where transformers are installed inside electrical buildings or prefabricated substations.

How to Select a Dry Type Transformer

Transformer selection should begin with the electrical system rather than simply choosing a kVA rating.

The following information should normally be confirmed before quotation.

1. Rated Capacity

Determine the required transformer capacity according to actual connected load, demand factor, expected load growth and operating reserve.

Common dry type transformer ratings include:

250 kVA
400 kVA
500 kVA
630 kVA
800 kVA
1000 kVA
1250 kVA
1600 kVA
2000 kVA
2500 kVA

Other capacities can be evaluated according to project requirements.

2. Primary and Secondary Voltage

Typical configurations include:

10 / 0.4 kV
35 / 0.4 kV

Other voltage ratios can be designed according to the power system.

3. SCB10 or SCB13

SCB10 is suitable for general distribution projects where reliable operation and cost are the main considerations.

SCB13 is recommended when reduced transformer losses and long-term energy efficiency are more important.

4. Copper or Aluminum Winding

HUARUI can provide copper- or aluminum-wound transformer configurations.

Copper windings generally provide high conductivity and compact winding design, while aluminum can provide a more economical solution for suitable applications.

The final choice should consider transformer rating, project specifications, dimensions, budget and customer standards.

5. AN or AF Cooling

AN – Air Natural
Uses natural air circulation and requires no continuously operating cooling fan.

AF – Air Forced
Uses fans to increase airflow around the windings and improve heat dissipation.

Cooling configuration should be selected according to transformer rating, loading conditions and installation ventilation.

6. Installation Environment

Before ordering, consider:

● Indoor or outdoor installation
● Ambient temperature
● Altitude
● Humidity
● Dust level
● Ventilation conditions
● Available installation space
● Required enclosure protection

Special environmental conditions should be provided to the manufacturer during the transformer design stage.

Custom Dry Type Transformer Solutions

Not every electrical project can use exactly the same transformer configuration.

As a dry type transformer supplier and manufacturer, HUARUI can provide project-specific transformer designs according to electrical and installation requirements.

Customizable items include:

● Transformer capacity
● Primary and secondary voltage
● 50 Hz or 60 Hz frequency
● Copper or aluminum winding
● Connection group
● Impedance
● Tapping range
● AN or AF cooling
● Enclosure configuration
● Temperature monitoring system
● Fan control system
● Cable entry and terminal arrangement
● Dimensions and installation layout
● Nameplates and project documentation

For projects involving unusual ambient temperatures, high altitude, high humidity, dust or restricted transformer-room dimensions, provide these conditions before production so that the transformer can be designed accordingly.

Why Choose HUARUI as Your Dry Type Transformer Manufacturer?

HUARUI has been involved in transformer manufacturing since 2003 and combines transformer design, component processing, assembly, testing and electrical equipment manufacturing within its production operation.

Transformer Manufacturing Capability

HUARUI operates dedicated transformer, electrical assembly, metalworking and other production workshops, supporting integrated production from component processing through final transformer assembly.

This allows us to control critical manufacturing stages rather than relying entirely on outsourced production.

Engineering and Customization Support

Transformer projects often involve more than selecting a standard model.

Our engineering team can work with customer specifications covering:

● Voltage ratio
● Capacity
● Winding material
● Loss requirements
● Impedance
● Cooling
● Enclosure
● Installation conditions
● Applicable project standards

This makes HUARUI suitable for distributors, EPC contractors, utilities and industrial project buyers requiring both standard and customized transformers.

Quality Management and Certifications

HUARUI has established quality and environmental management systems and holds certifications including:

● ISO 9001
● ISO 14001
● ISO 45001
● CE
● GOST

Relevant certification and testing requirements can be confirmed according to the destination market and specific transformer project.

Transformer Testing Before Shipment

Electrical testing is performed before transformers leave the factory to verify that manufactured units meet the approved technical specifications.

Project-specific test reports and technical documentation can be supplied according to order requirements.

Experience in International Projects

HUARUI transformers and electrical products have been supplied to customers in multiple overseas markets.

We support international buyers with technical parameter confirmation, project documentation, manufacturing, factory inspection, packing and export delivery.

Dry Type Transformer vs. Oil-Immersed Transformer

Both technologies are widely used in electrical distribution systems, but they suit different installation conditions.

The correct transformer type should ultimately be selected according to electrical rating, location, installation cost, environmental requirements and long-term operating conditions.

FAQ About Dry Type Transformers

What type of dry type transformers does HUARUI manufacture?

HUARUI mainly manufactures SCB10 and SCB13 three-phase cast resin dry type transformers for medium-voltage distribution applications.

Are HUARUI dry type transformers cast resin or VPI?

The SCB10 and SCB13 products shown in this category use epoxy resin cast solid insulation. They should therefore be classified primarily as cast resin dry type transformers rather than conventional open-wound VPI transformers.

What capacity dry type transformers can HUARUI supply?

HUARUI's standard SCB dry transformer range covers capacities from approximately 30 kVA to 2500 kVA, with project-specific ratings available after technical evaluation.

Do you manufacture 10 kV dry type transformers?

Yes. HUARUI manufactures three-phase dry type transformers for 10 kV distribution systems, including common secondary voltages such as 0.4 kV.

Can HUARUI manufacture 35 kV dry type transformers?

Yes. HUARUI offers 35 kV dry type transformer configurations, including SCB10 and SCB13 models for medium-voltage distribution projects.

Can I order a custom voltage ratio?

Yes. Primary voltage, secondary voltage, tapping range and connection group can be designed according to the customer's electrical system.

Can I choose copper or aluminum windings?

Yes. Both copper and aluminum winding configurations are available depending on technical requirements and project budget.

What is the difference between SCB10 and SCB13 dry type transformers?

Both are cast resin dry type transformer series. SCB13 uses an optimized energy-efficiency design with reduced losses compared with earlier SCB series, making it more suitable for projects prioritizing long-term operating efficiency.

Does a dry type transformer require oil maintenance?

No. Dry type transformers do not contain transformer oil, so routine maintenance procedures such as oil sampling, filtration and oil level inspection are unnecessary.

Regular inspection should instead focus on cleanliness, terminal connections, ventilation, winding temperature and cooling equipment.

Can dry type transformers be installed outdoors?

Dry type transformers are commonly installed indoors. Outdoor installation is possible when the transformer is designed with an appropriate protective enclosure and environmental protection measures.

The required IP level, rainfall, humidity, temperature, dust and corrosion conditions should be specified before ordering.

What information is required for a dry type transformer quotation?

To obtain an accurate quotation, please provide:

● Rated capacity (kVA)
● Primary voltage
● Secondary voltage
● Frequency
● Phase
● Winding material preference
● Connection group if specified
● Installation environment
● Required standards
● Quantity
● Any special dimensions or accessories

Request a Quote from a Dry Type Transformer Manufacturer

If you are sourcing a dry type transformer for an industrial plant, commercial building, data center, infrastructure project, renewable energy system or power distribution project, HUARUI can help determine the appropriate transformer configuration.

Send us your required kVA rating, primary and secondary voltage, frequency, application, quantity and technical specifications for a project-specific dry type transformer recommendation and quotation.