A dry-type transformer is a transformer whose core and windings are not immersed in insulating oil. Its high- and low-voltage windings are made of copper strip (foil) and then cast with epoxy resin in a vacuum and cured, forming a high-strength solid insulation structure. As a core piece of equipment in modern electrical systems, dry-type transformers are widely used in high-rise buildings, airports, subways, data centers, and industrial parks—places with strict fire and explosion protection requirements—due to their safety, environmental friendliness, and maintenance-free characteristics.
Compared to traditional oil-immersed transformers, dry-type transformers have the following revolutionary advantages:
* **Fire Safety:** Utilizing flame-retardant, fire-resistant, and self-extinguishing epoxy resin solid insulation materials, the completely oil-free design eliminates the risk of insulating oil leakage and fire.
Environmentally Friendly and Clean:** The insulation materials used are easily recyclable, pollution-free, and can be directly installed at the load center.
Maintenance-Free Operation:** No need for regular replacement of insulating oil, significantly reducing subsequent operation and maintenance costs and labor input.
High Efficiency and Energy Saving: Utilizing high-permeability, high-quality silicon steel sheets and advanced winding technology, no-load and load losses are significantly reduced, achieving an operating efficiency of over 99.5%.
Strong Adaptability: Can operate normally in 100% humidity environments, and can be restarted without pre-drying after shutdown. It also possesses excellent short-circuit and overload resistance.
Quiet Operation and Low Noise: Through advanced core structure and casting technology, operating noise is effectively reduced, meeting the quiet requirements of sensitive urban areas.
Haiyifeng Transformer: Your Reliable Partner for Dry-Type Transformers
With years of deep cultivation and accumulation in the power equipment field, Haiyifeng focuses on the research, development, manufacturing, and sales of high-quality dry-type transformers. We deeply understand the extreme requirements of power systems for safety and stability. Therefore, Haiyifeng's dry-type transformer series products strictly adopt epoxy resin vacuum casting technology to ensure no air bubbles inside the coils and low partial discharge values, thereby guaranteeing the products' outstanding characteristics such as excellent electrical performance, strong resistance to lightning strikes, strong short-circuit resistance, small size, and light weight.
To meet the power distribution needs of various application scenarios, Haiyifeng offers a comprehensive product portfolio:
SC(B) Series Resin-Insulated Dry-Type Transformers: The core utilizes high-permeability, high-quality grain-oriented cold-rolled silicon steel sheets with a 45° fully oblique step joint structure, significantly reducing no-load losses, current, and noise. Suitable for important locations such as high-rise buildings, airports, and power plants.
Epoxy Resin Cast Dry-Type Power Transformers: High and low voltage windings are wound with copper strip (foil), then cast with epoxy resin in a vacuum and cured, forming a high-strength fiberglass structure. Insulation classes cover F and H.
Integrated Solution with Shell and Temperature Control System: Products can be equipped with a temperature display controller to monitor and control the winding operating temperature in real time. It features over-temperature alarms and automatic tripping functions, ensuring long-term stable operation of the transformer under safe conditions.
Haiyifeng is committed to providing global customers with one-stop services from technical consultation and solution design to product delivery. With strict quality control and precise response to customer needs, our products have been exported to overseas markets such as Japan and the United States.
Why Choose Haiyifeng as Your Dry-Type Transformer Partner
Core Technology: Utilizing advanced epoxy resin vacuum casting technology, ensuring high insulation strength and heat resistance, low partial discharge value, and reliable operation.
Strict Quality Control: From raw materials to finished products, every transformer undergoes rigorous factory testing to ensure performance indicators meet or exceed international/domestic standards such as IEC and GB.
Professional Team: An experienced engineering team can provide customized design solutions based on the actual load requirements of projects, optimizing the layout of power distribution systems.
Global Service: Possessing mature export experience and excellent logistics coordination capabilities, providing reliable delivery guarantees for global partners.
Full-Process Support: Providing full-cycle services from technology selection and product customization to after-sales operation and maintenance, supporting OEM/ODM cooperation models.
Conclusion: Dry-Type Transformers – The Future Choice for Green Power Distribution
Against the backdrop of continuously growing global electricity demand, grid modernization, and accelerated grid integration of renewable energy, dry-type transformers, with their superior safety performance, environmental advantages, and high energy efficiency, are gradually becoming the mainstream choice for power distribution equipment. According to authoritative forecasts, the global dry-type transformer market is projected to grow from US$7.18 billion in 2026 to US$12.15 billion in 2034, representing a CAGR of 6.80%-34%.
Haiyifeng will continue to be driven by technological innovation, committed to providing safe, reliable, efficient, and environmentally friendly dry-type transformer products to safeguard the power systems of customers worldwide. Whether it's urban commercial complexes, high-end manufacturing plants, or new energy power generation projects, choosing Haiyifeng means choosing a safer, smarter, and greener power distribution solution.
In power transformer applications, selecting the right cooling method is critical for efficiency, lifespan, and operational safety. Among the most widely used transformer cooling systems are ONAN and ONAF cooling methods. Understanding the differences between these two systems helps utilities, industrial plants, and electrical engineers choose the best transformer solution for their projects.
As global power demand continues to grow in 2026, utilities, factories, renewable energy plants, and commercial facilities are increasingly choosing oil filled transformers for reliable and efficient power distribution. Compared with dry-type transformers, oil immersed transformers provide superior cooling performance, higher overload capacity, and longer service life in demanding environments.
Hot spot temperature is one of the most critical factors affecting the lifespan, efficiency, and operational safety of oil immersed transformers. Excessive hot spot temperatures accelerate insulation aging, reduce transformer reliability, and increase the risk of unexpected failures. For industries relying on continuous power supply, maintaining optimal transformer temperature is essential for long-term performance.Modern power systems widely use both ONAN transformer and ONAF transformer cooling methods to control internal heat generation and improve transformer stability. As a professional transformer manufacturer, Qingdao Haiyifeng Industry and Trade designs and manufactures high-efficiency oil immersed transformers engineered for superior thermal performance and lower hot spot temperatures.According to recent 2026 SEO and AI-search optimization trends, structured technical content with direct answers, practical solutions, and clear engineering explanations performs best for both Google Search and AI-driven search engines.
Choosing the right transformer is one of the most important decisions for industrial project developers and engineers. Factors such as energy efficiency, cooling performance, installation environment, operational lifespan, maintenance costs, and load capacity must all be considered carefully.
Among the most widely used transformer types in industrial applications are the oil immersed transformer and the dry type transformer. Each has its own advantages, disadvantages, and ideal application environments.
Power transformers play a vital role in alternating current (AC) power systems. Their main functions include voltage conversion, power transmission, and electrical isolation. By stepping up or stepping down voltage levels, they enable long-distance power transmission with minimal energy loss and ensure safe distribution to end users.
Did you know? Without transformers, the modern power system would be impossible. High-voltage electricity from power plants is stepped down through a series of transformers before being safely delivered to your home's electrical outlet. These silent "power guardians" work every day, but few people truly understand their internal components and their respective functions.
The three main functions of an electrical transformer are to increase or decrease voltage levels (voltage transformation), enable efficient long-distance power transmission, and provide electrical isolation between circuits.
Exploring the disruptive advantages of Haiyifeng transformer's 3D wound core oil-immersed transformers in power distribution. As a national-level manufacturing single-item champion enterprise, Haiyifeng transformer's with its unique amorphous alloy 3D wound core and other energy-saving core technologies, provides power systems with superior cooling efficiency, stronger insulation protection, and sustainable energy transmission solutions.
In our previous overview, we discussed the basic types and properties of transformer oil. However, engineers and maintenance teams often face real-world challenges: Which oil is best for a tropical substation? How often should dielectric strength be tested? Can I top up a mineral‑oil transformer with ester oil? This article provides quantitative benchmarks, a decision framework, and hands‑on maintenance procedures to help you extend transformer life and avoid costly failures.
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