Oil Immersed Type Transformer
Level 2 Energy Efficiency – Low loss, energy-saving and power-efficient.
Fully Sealed Structure – Maintenance-free with no oil leakage.
Strong Short-Circuit Resistance – Stable and reliable operation.
Low Noise Operation – Suitable for residential areas and schools.
Good Overload Capacity – Excellent heat dissipation performance.
High Cost Performance – Ideal for both new projects and upgrades.
I. Product Introduction
The S20-M Series Three-Phase Oil-Immersed Fully Sealed Distribution Transformer is an energy-saving transformer designed and manufactured in accordance with the GB 20052-2024 national standard, meeting Level 2 energy efficiency requirements.
The product adopts high-permeability grain-oriented silicon steel sheets, full copper windings, and a fully sealed corrugated oil tank structure, featuring low losses, stable operation, long service life, and maintenance-free performance.
It is widely used in power grids, industrial facilities, commercial buildings, and public power distribution systems, making it a cost-effective mainstream energy-saving transformer for new construction and power system upgrade projects.
II. Core Technical Parameters（customizable）
Rated Capacity: 30 kVA – 2500 kVA
Rated Voltage: 10 kV ±2 × 2.5% / 0.4 kV
Rated Frequency: 50 Hz
Phase: Three-phase
Vector Group: Dyn11, Yyn0
Cooling Method: ONAN (Oil Natural Air Natural)
Insulation Class: Class A
Impedance Voltage: 4% – 6% (depending on capacity)
Protection Level: IP54
Energy Efficiency Level: GB 20052-2024 Level 2 Energy Efficiency
Operating Environment: Outdoor use, -25°C to +40°C
III. Main Features
1. Level 2 Energy Efficiency – Energy Saving
Loss values are lower than traditional S9 and S11 transformers, reducing both no-load and load losses and significantly lowering long-term electricity costs while meeting national energy-saving requirements.
2. Fully Sealed Structure – Maintenance-Free
The corrugated fully sealed oil tank design effectively isolates air and moisture, preventing oil oxidation and aging, ensuring long-term maintenance-free operation without oil leakage.
3. Strong Short-Circuit Resistance
Full copper windings combined with a robust support structure provide high mechanical strength, enabling the transformer to withstand sudden short-circuit impacts and maintain safe and stable operation.
4. Low Noise and Low Vibration
The optimized core structure and lamination process reduce hysteresis losses, vibration, and noise, making the transformer suitable for noise-sensitive environments such as residential areas, schools, and hospitals.
5. Strong Environmental Adaptability
Suitable for installation in outdoor environments, box-type substations, and pole-mounted systems, with excellent resistance to temperature fluctuations, moisture, and dust.
6. High Cost Performance and Wide Applicability
Balancing energy efficiency and cost, it has a lower procurement cost than Level 1 energy-efficient products, making it an ideal choice for new projects, grid upgrades, and industrial/commercial power distribution.
IV. Application Scenarios
Construction and upgrade projects for urban and rural power grids
Industrial parks, factories, mines, and enterprise distribution rooms
Residential communities, commercial complexes, hotels, and office buildings
Schools, hospitals, stations, and municipal public buildings
Box-type substations and outdoor pole-mounted distribution systems
Various power distribution projects requiring energy efficiency, reliability, and reasonable investment costs.
