The three-phase oil-immersed distribution transformer is a core device widely used in power transmission and distribution systems. Designed for rated frequencies of 50Hz or 60Hz, it efficiently converts high-voltage power into low-voltage power suitable for industrial, commercial, and residential applications. The product fully complies with international and domestic standards including IEC 60076, GB 1094, GB/T 6451, and GB 20052-2020.

This transformer series covers a capacity range from 30kVA up to 2500kVA and above, with voltage ratings covering 6kV, 10kV, 20kV, 35kV, 110kV, 220kV and beyond, meeting diverse requirements from distribution networks to high-voltage transmission systems.

1. Low Loss & High Energy Efficiency
• Core made of high-quality cold-rolled grain-oriented silicon steel, significantly reducing no-load losses
• Optimized winding design minimizes stray losses and eddy current losses
• Available in Energy Efficiency Grade 1, 2, and 3 to support national energy-saving policies

2. Strong Short-Circuit Withstand Capability
• Dynamic analysis method applied for mechanical force calculation under short-circuit conditions
• Multi-layer cylindrical structure for HV windings improves impulse voltage distribution
• All fasteners treated with anti-loosening measures to ensure long-term operational stability

3. Low Noise Operation
• High-quality core material with optimized flux density selection
• Step-lap joint manufacturing process improves flux distribution at core joints
• Operating noise levels well below international standard requirements

4. Fully Sealed & Maintenance-Free
• Corrugated tank fully sealed structure completely isolates transformer oil from air
• Slows down insulation material aging and extends service life
• No core lifting inspection or routine maintenance required

5. Strong Environmental Adaptability
• Suitable for extreme conditions: ambient temperature from -35°C to +45°C, altitude up to 1000m and above
• Plateau models available for operation at altitudes exceeding 4500m
• Designed for outdoor, high-humidity, salt-spray, and other harsh environments

Rated Power: 30 ~ 2500+ kVA
HV Voltage: 6kV, 6.3kV, 10kV, 10.5kV, 11kV, 20kV, 35kV, 110kV, 220kV
LV Voltage: 0.4kV, 0.415kV, 0.433kV, 0.69kV
Vector Group: Dyn11, Yyn0, Yzn11 (customizable)
Tapping Range: ±5% or ±2×2.5% (customizable)
Short-Circuit Impedance: 4% ~ 6% (depending on capacity rating)
Frequency: 50Hz / 60Hz
Cooling Method: ONAN (Oil Natural Air Natural)

• Power Systems: power plants, substations, transmission and distribution grids
• Industrial Enterprises: mining, petrochemical, smelting, manufacturing
• Infrastructure: metro systems, airports, railway stations, high-rise buildings
• Urban & Rural Power Grids: residential areas, commercial districts, rural electrification
• Renewable Energy: wind power, photovoltaic, and energy storage systems

• IEC 60076 Series
• GB 1094.1-2013 – Power Transformers – Part 1: General
• GB/T 6451-2015 – Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers
• GB 20052-2020 – Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers

Why Choose Us
• Professional Manufacturing: years of R&D and production experience in the transformer industry
• Quality Assurance: ISO 9001 certified with full-process quality control
• Customization Services: flexible customization of voltage, capacity, vector group, and other parameters
• Comprehensive After-Sales: technical support, installation guidance, and long-term maintenance services