The S11 Three-phase Oil-immersed Transformer is a second-generation energy-saving three-phase oil-immersed power distribution transformer, mainly used for power distribution and voltage reduction power supply in 10kV and below power distribution networks.
This series of products complies with national energy efficiency standards and is widely used in power grid renovations and new construction projects.
1.Energy-saving features
• The no-load loss is reduced by approximately 25-30% compared to the S9 series.
• The load loss is reduced by approximately 10-15% compared to the S9 series.
• The overall operating loss has significantly decreased, and the energy-saving effect is obvious.
2. Structural Design Features
• Core Structure: Utilizes high-quality cold-rolled silicon steel sheets, with 45° fully inclined seams and no punching holes, reducing magnetic circuit losses.
• Winding Design: The high-voltage winding adopts a multi-layer cylindrical structure, while the low-voltage winding is wound with copper foil or copper wires.
• Tank Structure: Wave-shaped tank or expansion-type radiator, fully sealed design, maintenance-free.
• Insulation System: Uses high-temperature-resistant insulation materials to enhance overload capacity.
3. Operational Reliability
• Strong resistance to short circuits, verified through rigorous short-circuit tests.
• Reasonable temperature rise control, extending the service life of the transformer The operation noise is low and it complies with environmental protection requirements.
| Parameter Category | Technical Specifications |
|---|---|
| Rated Capacity | 30kVA, 50kVA, 80kVA, 100kVA, 125kVA, 160kVA, 200kVA, 250kVA, 315kVA, 400kVA, 500kVA, 630kVA, 800kVA, 1000kVA, 1250kVA, 1600kVA, 2000kVA, 2500kVA |
| Rated Voltage | High Voltage Side: 10kV, 10.5kV, 11kV Low Voltage Side: 0.4kV |
| No-load Loss | 25-30% lower than S9 standard Example: ~450W for 315kVA (670W for S9) |
| Load Loss | 10-15% lower than S9 standard Example: ~3650W for 315kVA (4300W for S9) |
| No-load Current | 0.9-2.0% (decreases with increasing capacity) |
| Impedance Voltage | 4.0-4.5% |
| Insulation Class | Class A (105°C) |
| Temperature Rise Limit | Winding: 65K, Top Oil: 55K |
| Connection Symbol | Dyn11, Yyn0 |
| Noise Level | ≤50-55dB(A) (measured at a distance of 0.3m) |
| Protection Rating | IP54 (outdoor type) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
Urban intelligent distribution network: Cable ring main units, switch stations, cable distribution boxes, enabling fault location and joint temperature monitoring.
Highly reliable power supply area: Power distribution systems for data centers, hospitals, and airports, to prevent power outages caused by overheating.
Power distribution room of industrial and mining enterprises: Monitors the temperatures of the connection points of busbars and cable heads inside the high-voltage switch cabinets to ensure production safety.
New energy power stations: Monitoring of the high-voltage side of photovoltaic/wind power box transformers, addressing the issue of overheating at outdoor equipment connection points that makes inspection difficult.
We offer comprehensive OEM and ODM services tailored to your specific requirements. Should you require customized products, our professional team will provide full support to meet your needs.
