In modern power systems, dry-type transformers have become a preferred choice for safe, environmentally friendly, and efficient power distribution. Their oil-free design, ease of maintenance, and excellent performance have made them widely adopted in urban power networks, industrial plants, and renewable energy projects. This article provides an in-depth overview of their technical specifications, core advantages, and typical application scenarios.
1. Technical Conditions of Dry-Type Transformers
Cooling Methods: Dry-type transformers mainly use natural air cooling (AN) for small capacities and forced air cooling (AF) for larger systems. Natural cooling supports stable long-term operation, while forced cooling enhances heat dissipation and overload capacity.
Electrical Parameters: Operating frequencies are typically 50Hz or 60Hz, with voltage levels including 6kV, 10kV, and 35kV. The design focuses on minimizing no-load current and energy losses to improve efficiency.
Insulation and Withstand Voltage: The insulation systems meet national and international standards. Low-voltage sides undergo industrial frequency withstand tests, and high-voltage insulation resistance is rigorously tested to ensure safe operation.
Winding Connection Methods: Common configurations include Yyn0 and Dyn11, which can be selected based on grid structure and power distribution needs, supporting three-phase systems and parallel operation.
Temperature Rise and Noise Control: Coil temperature rise is strictly limited, typically using Class F or H insulation to ensure stability in high-temperature environments. Operating noise is low, meeting the requirements for quiet zones like hospitals and data centers.
Operating Environment: These transformers are suitable for altitudes ≤1000 meters and ambient temperatures from -25℃ to +40℃. Humidity and pollution levels must also comply with design standards. Outdoor models can be equipped with protective enclosures.
Structure and Accessories: The enclosure is usually made of stainless steel or aluminum alloy for excellent protection. Coils are cast in epoxy resin under vacuum, offering self-extinguishing and high mechanical strength. Equipped with temperature sensors, alarms, and trip protection to ensure operational safety.
2. Advantages of Dry-Type Transformers
High Safety: The oil-free design eliminates risks of leakage and fire. Epoxy resin castings offer excellent flame resistance and thermal stability, with high mechanical strength and seismic performance, ideal for fire- and explosion-proof environments.
Environmentally Friendly and Energy Saving: Dry-type transformers are pollution-free, with low noise and minimal no-load losses. They comply with top-level energy efficiency standards and perform well in green buildings and renewable energy systems.
Long Service Life: The insulation system degrades slowly, with a typical service life of over 30 years. With no need for oil changes, maintenance is simple and operating costs are reduced significantly.
Intelligent Monitoring: Many models integrate temperature sensors and wireless monitoring for real-time status updates, enabling remote management and smart operation.
3. Typical Applications of Dry-Type Transformers
Commercial and Public Buildings: Ideal for malls, office buildings, hospitals, and schools due to their compact size, low noise, and high safety.
Industrial Sector: Well-suited for dusty, humid, and high-temperature environments such as chemical plants and mines. The sealed, corrosion-resistant design ensures stable operation.
New Energy Systems: Widely used in booster stations for wind and solar power. Their design is suitable for outdoor, high-humidity, and high-altitude conditions, improving transmission efficiency.
Data Centers and Technology Parks: Dry-type transformers provide high reliability and electromagnetic compatibility, ensuring uninterrupted power supply to critical equipment.
Marine and Nuclear Applications: Their salt spray resistance and robust construction make them suitable for offshore platforms and nuclear plant auxiliary systems, meeting the highest safety and reliability standards.
As the power industry moves toward greener and smarter technologies, dry-type transformers continue to demonstrate their value with excellent performance, safety, and adaptability. Whether in urban infrastructure, industrial manufacturing, or renewable energy deployment, they represent the future of reliable and sustainable power distribution.
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