Dry-type transformers, characterized by their core and windings not being immersed in insulating oil, have evolved significantly since their introduction in 1964. The development of a 400kVA/20kV epoxy cast resin dry-type transformer by AEG in Germany, along with the invention of Nomex insulation paper in the U.S., paved the way for modern H-class dry transformer technology.
Today, the market features two main types: epoxy cast transformers and Nomex paper-based transformers. Utilizing natural air (AN) or forced air (AF) cooling methods, these transformers serve a wide range of applications—from urban power grids to high-demand industrial sectors.
Residential Applications of Dry-Type Transformers
Dry-type transformers are widely used in 10kV/0.4kV distribution systems to convert high-voltage electricity into 220V/380V residential power. Commonly installed in community power distribution rooms, basements, and floor-mounted shafts, they ensure reliable energy delivery for residential living.
They also power essential public infrastructure, including elevators, fire suppression systems, lighting, and water pumps. In emergencies, they maintain the functionality of critical systems such as fire alarms and emergency lighting to protect residents.
In modern homes with solar panels or battery storage systems, dry-type transformers support distributed energy integration by converting generated electricity into grid-compliant power, promoting sustainable energy use through self-consumption and feed-in mechanisms.
Advantages in Residential Use
Dry-type transformers offer exceptional safety due to epoxy resin or VPI insulation technologies, and are compliant with UL94 V-0 flammability standards. Being oil-free, they eliminate the risk of leakage or explosion, making them ideal for densely populated areas.
They are environmentally friendly, producing low noise levels under 60 dB (1 meter), and meet urban noise emission standards (GB 22337-2008). Their compact design suits limited-space installations, reducing construction costs, while high IP protection ratings resist moisture and dust, minimizing maintenance needs and long-term operational expenses.
Industrial Applications of Dry-Type Transformers
In manufacturing facilities, dry-type transformers provide reliable power for production lines, machinery, and lighting systems. In the automotive industry, they step down voltages for assembly equipment, while in chemical plants, explosion-proof models ensure safety in hazardous environments. Transformers can be customized for specific voltage, capacity, and temperature requirements.
They also play a crucial role in industrial automation, supplying clean and stable voltage to PLCs, sensors, and motors, which ensures smooth control of automated production lines and boosts manufacturing efficiency.
In the data center sector, dry-type transformers are integrated into UPS and power distribution networks. They ensure stable power for servers, cooling units, and backup systems—vital for uninterrupted data processing and storage operations.
Advantages in Industrial Use
Dry-type transformers offer excellent environmental adaptability, operating efficiently under high temperatures, dust, and mechanical vibration, thereby reducing unplanned downtime. Their high energy efficiency exceeds national Tier 1 standards, minimizing no-load and load losses and supporting carbon neutrality goals.
Constructed with recyclable epoxy resins and metal components, they are non-toxic and environmentally sustainable. At the end of their service life, they pose no risk to soil or groundwater, aligning with industrial environmental protection regulations.
Dry-type transformers are essential for modern power systems, delivering safety, efficiency, and reliability in both residential and industrial applications. Their oil-free, low-noise, and maintenance-friendly design makes them a sustainable choice for future energy infrastructure—meeting the demands of urban growth, smart manufacturing, and green energy development.
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