low loss oil immersed transformer

1.Product Introduction 

The 35kV S20 Series Oil-Immersed Power Transformer represents a next-generation ultra-high energy efficiency transformer. Featuring advanced low-loss silicon steel sheets, optimized magnetic circuit design, and fully sealed reliability engineering, it outperforms traditional models like S18, S13, and S11 in loss parameters while meeting China's leading energy efficiency standards. Designed for 35kV power transmission and distribution systems, this equipment excels in voltage conversion, power distribution, and renewable energy grid integration. With low-loss operation, quiet performance, high reliability, maintenance-free operation, and extended service life, it serves as a core energy-saving solution for grid upgrades, large-scale industrial facilities, data centers, renewable power plants, and high-end power supply applications.

2. Technical Specifications （customizable）

• Rated Voltage: 35kV±2×2.5%/10kV/0.4kV • Rated Frequency: 50Hz • Connection Group: YNd11/Dyn11 • Cooling Method: ONAN oil-immersed self-cooling • Capacity Range: 50kVA to 31,500kVA • Impedance Voltage: 6.5%–8% (per capacity) • Insulation Class: Grade A • Protective Structure: Fully sealed corrugated oil tank with plate-type radiator • Operating Environment: -30°C to +40°C 

3. Key Features 

1. Ultra-high energy efficiency with reduced losses: Both no-load and load losses significantly exceed national standards, demonstrating further improvement over S18 standards. Long-term operation achieves remarkable energy savings and lower overall operating costs, fully compliant with China's dual-carbon energy conservation requirements.

Ultra-low noise with quiet operation: Optimized iron core structure and vibration damping noise reduction design result in lower operational noise levels, making it suitable for high-quietness environments such as residential areas, schools, hospitals, and office buildings.

Fully sealed maintenance-free design with oil-free bearing: The all-sealed structure prevents transformer oil from contacting air, providing oxidation resistance, moisture protection, and leak prevention. This eliminates core lifting and routine maintenance requirements, resulting in extremely low operational and maintenance costs.

Strong short-circuit resistance, high mechanical strength of windings, and stable insulation structure enable it to withstand grid surges, load fluctuations, and short-circuit stresses, ensuring safe and reliable operation.

Low temperature rise and extended service life: Optimized cooling system ensures excellent temperature rise control, effectively delaying insulation aging, thereby prolonging equipment lifespan and enhancing stability.

Strong environmental adaptability with excellent anti-corrosion, moisture-proof, dust-proof, and weather resistance properties, suitable for complex environments such as outdoor areas, substations, container substations, high-altitude regions, and coastal areas.

4. Application Scenarios 

• New construction and energy-saving retrofitting of urban/rural 35kV power grids • High-load power supply for large industrial parks, factories, mines, metallurgical plants, and chemical facilities • Step-up transformers for wind farms, photovoltaic systems, and energy storage stations • Data centers, commercial complexes, hospitals, schools, and luxury residential complexes • Infrastructure projects including railways, highways, airports, water conservancy facilities, and municipal systems • Main transformers in substations, containerized substations, and outdoor tower-type distribution systems