SG Series Three-Phase Dry-Type Transformers: A Reliable Choice for Modern Power Systems
In modern power systems, transformers play a core role in voltage conversion, electrical isolation, and energy transmission. With the continuous advancement of industrial automation and the increasing diversification of electrical loads, the market demands transformers with higher safety, environmental compatibility, and operational stability. The SG Series three-phase dry-type transformers, with their excellent electrical performance and structural advantages, are becoming the preferred solution for numerous industrial enterprises, infrastructure projects, and precision equipment applications.
1. Product Overview and Technical Advantages
The SG Series three-phase dry-type transformers are designed for indoor, natural air‑cooled (AN) operation, suitable for AC 50Hz to 60Hz systems with voltages up to 1000V. The series covers a capacity range from 300VA to 1000kVA, meeting diverse requirements from small control power supplies to large motor distribution networks. In the core manufacturing process, high‑grade cold‑rolled grain‑oriented silicon steel is used, combined with a 45° full‑miter overlap and step‑lap stacking technique, which effectively reduces no‑load losses and magnetising current while significantly suppressing audible noise. The windings are manufactured using a continuous layer‑winding method and undergo vacuum pressure impregnation (VPI), ensuring a stable insulation class of F or H. The products comply with international and national standards including IEC 439, GB 5226, and GB/T 1094.11.
Compared with traditional oil‑immersed transformers, the SG Series dry‑type transformers require no insulating oil for cooling—relying solely on natural air convection—and thus offer outstanding fire resistance, zero oil leakage risk, and no environmental pollution. These features make them particularly suitable for indoor locations with strict fire safety and environmental protection requirements.
2. In‑Depth Applications in Industrial Manufacturing
In precision machining and automated production, the SG Series three‑phase dry‑type transformers are widely deployed. CNC machining centres, laser cutting equipment, injection moulding machines, and various automated production lines demand extremely stable supply voltages—voltage fluctuations beyond permissible limits can directly compromise machining accuracy or even cause equipment shutdowns. The SG Series transformers can accurately convert a grid voltage of 380V to the required 220V or other customised voltages, achieving regulation accuracy within ±1%. Moreover, the isolating winding structure effectively blocks common‑mode interference and high‑frequency pulse noise from the grid side, providing a “clean” power supply for precision control systems. In one large machinery manufacturer, after retrofitting its imported CNC production lines with SG Series isolation transformers, voltage‑related fault rates dropped by over 60%, significantly enhancing production continuity.
3. Power Distribution for Infrastructure and Public Buildings
High‑rise buildings, subway hubs, airport terminals, hospitals, and data centres require exceptional power reliability and fire safety. The SG Series dry‑type transformers, being oil‑free and low‑noise, can be installed close to load centres, effectively shortening low‑voltage feeder lengths and reducing line losses. In medical IT systems (isolated power systems), SG Series transformers establish a new neutral earthing point, delivering safe and reliable isolated power to critical areas such as operating theatres and ICUs, thus ensuring electrical safety for both patients and medical staff. In data centre applications, these transformers are often used in conjunction with uninterruptible power supplies (UPS) to perform voltage matching and galvanic isolation between the mains and UPS output, guaranteeing stable, continuous power to server racks.
4. Applications in New Energy and Special Operating Conditions
With the rapid growth of photovoltaic (PV) power, wind energy, and other renewable sources, the SG Series three‑phase dry‑type transformers are also playing a vital role in new energy systems. Between PV inverters and the grid, they perform step‑up transformation and galvanic isolation; in wind turbine generators, they supply auxiliary power and control system voltages. Additionally, in marine power distribution, tunnel lighting, and coal‑bed methane extraction, the SG Series transformers demonstrate excellent environmental adaptability due to their moisture‑proof, shock‑resistant, and corrosion‑resistant construction.
5. Conclusion
The SG Series three‑phase dry‑type transformers offer comprehensive advantages—low losses, low noise, high reliability, and eco‑friendly safety—and have proven their value in industrial manufacturing, infrastructure development, new energy projects, and specialised industries. For any electrical installation that prioritises power quality and operational safety, choosing the SG Series dry‑type transformer means choosing stability and peace of mind.