Dry Type Distribution Transformer

Your Professional Dry Type Distribution Transformer Supplier

Hebei Hozee Electric Co., Ltd., a professional Chinese distribution transformer manufacturer registered in Shijiazhuang, Hebei, adheres to "Efficient, Intelligent, Green" and is led by founder/CTO Liu Yanchao (15+ years in transformers) and his team of senior engineers (avg. 8+ years, mastering IEC/GB standards).It provides customized solutions (for voltage, working conditions, load) to serve domestic industrial/new energy/grid upgrade markets and over 50 countries globally. Future-focused on tech innovation, aiming to support the global energy transition.

11kv Dry Type Transformer
Power: 400KVA dry type transformer Primary voltage: 11000V Secondary voltage: 400V Impedance:4% Frequency: 50HZ
read more

Why Choose Us

Our Certificate
3 intelligent production lines with an annual production capacity of 500,000 kVA. It has passed ISO 9001 and ISO 14001 certifications, and the products comply with standards such as GB/T and IEC 60076.

Production Equipment
Our core equipment includes: slitting machines, horizontal shearing machines, horizontal shearing winding machines, and annealing furnaces; transformer equipment includes: foil winding machines, winding machines, drying furnaces, casting tanks, and transformer testing equipment.

Production Market
Our products are exported to countries along the "Belt and Road" such AS Southeast Asia, the Middle East, Latin America and Africa. They are adapted to different climatic conditions (such as tropical high humidity, desert high temperature and plateau low pressure) and power grid standards (IEC, ANSI, BS, AS/NZS, etc.), and have passed international certifications such as CE, CB and SASO, achieving "localized technology and global quality".

Technical Team
Our team of senior engineers, with an average of 8+ years of experience, excels in distribution transformer principles, market demands, and international standards (IEC, GB).

Advantages of Dry Type Distribution Transformer

01/

Safety and Fire Resistance
Unlike oil-filled transformers, dry-type transformers do not contain flammable liquids, making them less of a fire hazard. This is especially important in urban areas or indoor applications, where fire safety is a top priority. Cast resin transformers are self-extinguishing, which adds an extra layer of safety.

02/

Environmental Benefits
Dry-type transformers are more environmentally friendly than oil-filled ones. They don’t require mineral oil for insulation, which reduces the risk of oil spills and contamination. Additionally, the use of eco-friendly insulation materials, such as epoxy resin, further enhances their environmental appeal.

03/

Low Maintenance
With no oil to change and sealed insulation, dry-type transformers are easy to maintain. Their solid insulation materials protect the internal components from dust, moisture, and other contaminants, reducing the need for frequent inspections or repairs.

04/

Versatility
Dry-type transformers are suitable for a wide range of applications, from small-scale commercial use to large industrial systems. Their versatility and adaptability make them an ideal choice for many power distribution projects.

Specification

Model	SCB-400kVA-11/0.4
Type	Dry type Transformer
Standard	IEC60076
Rated Power	400kVA
Frequency	50HZ
Phase	Three
Cooling Type	ANAF
Primary Voltage	11 KV
Secondary Voltage	0.4KV
Winding Material	Copper
Vector Group	Dyn11
Impedance	4%
Tap Changer	NLTC
Tapping Range	±2*2.5% @ Primary Side
Load Loss	0.98 KW
No Load Loss	39.90KW

Types of Dry Type Distribution Transformer

Non-Ventilated Transformers
Non-ventilated dry-type transformers are designed with enclosures that restrict or prevent the free exchange of air between the inside and outsid

Autotransformers (Dry Type)
Dry-type autotransformers differ from conventional isolation transformers in that they have a single winding with a tap, serving as both the primary and secondary windings. This design results in a smaller size, lighter weight, and higher efficiency compared to two-winding transformers when the voltage transformation ratio is close to unity.

Vacuum Pressure Impregnated (VPI) Transformers
VPI transformers are constructed with windings that are impregnated with a polyester or epoxy resin under vacuum and pressure. This process ensures deep penetration of the resin into the winding insulation, creating a robust and moisture-resistant insulation system.

Resin Encapsulated or Cast Resin Transformers (CRT)
Cast resin transformers feature windings that are completely encapsulated in epoxy resin within a mold. This encapsulation provides excellent protection against harsh environmental conditions, including high humidity, dust, and corrosive atmospheres.

Open Wound Transformers
Open wound dry-type transformers have their windings insulated with varnish or enamel and are not fully enclosed in a resinous material. They rely primarily on the inherent insulating properties of the winding insulation and the surrounding air for cooling and insulation.

Components of Dry Type Distribution Transformer

Core and Windings
The primary winding, connected to the power source, conducts alternating current along a circular path around the core to generate a magnetic field. This field induces a voltage across the secondary winding, enabling energy transfer between the primary and secondary voltages.

Insulation
Solid insulation materials ensure electrical separation between the core, windings and winding layers. These materials separate the windings into multiple layers, mitigating potential short circuits and guaranteeing safe energy transmission.

Cooling Mechanisms
The cooling mechanisms, typically a blend of natural convection and forced air cooling techniques, maintain the transformer’s optimal operational temperature. Balancing these cooling mechanisms helps the transformer’s longevity and reliability.

Enclosure and Protection
The enclosure protects the core and windings from the elements and keeps personnel out for safety.

Terminals, Bushings and Connections

Terminals and supplementary components such as bus bars and bushings integrate the external circuits with the transformer’s internal windings and prevent flashovers.

Tap Changer

A de-energized tap changer allows for voltage adjustment. Its essential function is to alter the winding turns ratio for voltage adjustment.

Grounding System

The grounding system redirects redirecting electrical faults away from the transformer, channeling them safely into the ground. This safety measure reduces the probability of electrical shocks, equipment harm, potential fires, injury and death.

Temperature Monitoring and Protection

Temperature monitoring and protection mechanisms prevent overheating, a significant concern in transformer function, and take action if temperatures rise too high, preserving the transformer’s operational integrity.

Application of Dry Type Distribution Transformer

01.

Healthcare

In hospitals and medical facilities, where safety is paramount, dry-type units provide a non-toxic, low-maintenance power solution that minimizes fire risks.

02.

Data Centers

Dry-type units are ideal for data centers, where temperature control and minimal maintenance are essential to protect sensitive equipment and maintain uptime.

03.

Manufacturing

With their durability and resistance to harsh conditions, dry-type distribution systems are widely used in manufacturing plants that require reliable power for continuous operations.

04.

Educational Institutions

Schools and universities benefit from these systems’ low noise levels and compact design, making them suitable for confined spaces in buildings.

FAQ

Q: What are the advantages of dry type transformers?

A: Since dry type power transformers do not use harmful liquids or fluids to function, they do not release harmful gases into the environment. Also, they have no flammable fluid, so low risk of exploding or catching fire. Because of this, dry transformers are the most preferred for indoor use due to their reliability.

Q: Why are dry type transformers more popular?

A: Dry type transformers—which use air or solid insulation instead of liquid dielectric oil—offer significant advantages in these applications. They minimize fire risks, require less maintenance, and adapt well to indoor installations, making them a popular choice for critical infrastructure.

Q: Where are dry type transformers commonly used?

A: Low voltage dry-type transformers are typically rated on the primary and secondary at 600 volts and below. These transformers are most often used inside commercial and industrial buildings for stepping the building service voltage up or down for a piece of equipment that operates at a different voltage.

Q: Are dry transformers more fire-resistant?

A: Traditional oil-filled transformers pose a fire hazard due to the flammable liquids they use. Dry-type cast resin transformers, on the other hand, are inherently fire-resistant. Their epoxy resin insulation is self-extinguishing, which drastically reduces the risk of fire spreading.

Q: What are the limitations of dry type transformers?

A: Dry-type transformers are generally limited to power ratings below 20–25 MVA and voltage levels up to 36 kV (with special designs reaching 72.5 kV). These limits are due to thermal management challenges, insulation constraints, size, cost, and arc containment in high-voltage environments.

We're professional dry type distribution transformer manufacturers and suppliers in China, specialized in providing high quality products with advanced design. We warmly welcome you to buy dry type distribution transformer at competitive price from our factory. For specifications and drawings, contact us now.

air insulated dry type transformer, cast resin dry type transformer, dry core transformer