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China S11/S13 Oil-Immersed Transformer Manufacturer - Low-Loss Copper Solutions from Trusted Suppliers & Factory
Core Product Advantages
1
Outstanding Economic Benefits & Significant Energy Conservation
Compared with the traditional S9 series, the S11 series achieves an average reduction of 30% in no-load loss, a significant decrease of 70%–85% in no-load current, and an additional 15% reduction in total loss compared to national standards. With high-permeability cold-rolled silicon steel core and oxygen-free copper winding, the power conversion efficiency is higher. Each unit can save over 1,000 kWh of electricity annually. Long-term use can help users significantly reduce electricity costs, achieving a win-win situation of green energy conservation and economic benefits.
2
Fully Sealed Design & Extremely Long Service Life
The transformer oil tank adopts a fully sealed structure. The oil tank and flange can be flexibly connected by bolts or welded, ensuring that the transformer oil is completely isolated from the air. This effectively avoids oil oxidation, moisture absorption and deterioration, fundamentally extending the equipment's service life to over 25 years, reducing the frequency of later replacement and maintenance, and lowering the overall investment cost.
3
Process Upgrades & Safety Enhancements
Core components of the oil tank sealing system have been improved and manufacturing processes optimized, significantly enhancing sealing performance and effectively preventing leakage risks. The equipment is equipped with multiple safety protection devices such as pressure relief valves and gas relays, offering excellent fire and explosion resistance. It has passed ISO9001 quality management system certification and national 3C compulsory certification, ensuring stable operation in extreme temperatures ranging from -40°C to 60°C and guaranteeing uninterrupted power transmission.
4
Compact Structure Design & Space-Saving
The S11-M series exclusively adopts corrugated plate radiators. By utilizing the natural expansion and contraction of the corrugated plates when the oil temperature changes, it replaces the traditional oil conservator function. This makes the appearance simple and elegant while significantly reducing equipment volume and occupied area. The product capacity ranges from 10 kVA to 2500 kVA, with voltage levels suitable for mainstream scenarios of 10 kV / 0.4 kV. It supports customized design, and installation and maintenance are convenient and efficient — ideal for factories, urban distribution networks, and new energy projects.
Product Specifications
| Rated Capacity (kVA) | Voltage Combination | Connection Group Symbol | No-load Loss (W) | On-Load Loss (kW) 75℃ | No-load Current (%) | Short-circuit Impedance (%) | ||
| High Voltage (kV) | High Voltage Tapping (kV) | Low Voltage (kV) | ||||||
| 30 | 6 6.3 10 10.5 11 |
± 5% ± 2*2.5% |
0.4 | Dyn11 Yno |
100 | 630/600 | 0.80 | 4.0 |
| 50 | 130 | 910/870 | 0.75 | |||||
| 63 | 150 | 1090/1040 | 0.75 | |||||
| 80 | 180 | 1310/1250 | 0.70 | |||||
| 100 | 200 | 1580/1500 | 0.65 | |||||
| 125 | 240 | 1890/1800 | 0.65 | |||||
| 160 | 280 | 2310/2200 | 0.60 | |||||
| 200 | 340 | 2730/2600 | 0.50 | |||||
| 250 | 400 | 3200/3050 | 0.50 | |||||
| 315 | 480 | 3830/3650 | 0.45 | |||||
| 400 | 570 | 4520/4300 | 0.45 | |||||
| 500 | 680 | 5410/5150 | 0.40 | |||||
| 630 | 810 | 6200 | 0.40 | 4.5 | ||||
| 800 | 980 | 7500 | 0.35 | |||||
| 1000 | 1150 | 10300 | 0.35 | |||||
| 1250 | 1360 | 12000 | 0.30 | |||||
Detail Pictures
Frequently Asked Questions
Q
What is the main difference between the S11 series and the traditional S9 series oil-immersed transformer?
The S11 series offers approximately 30% lower no-load loss and 70%–85% lower no-load current compared to the S9 series. It also features a fully sealed oil tank design, corrugated plate radiators, and a longer service life exceeding 25 years, making it significantly more energy-efficient and cost-effective for long-term operation.
Q
What capacity range and voltage levels does the S11 series support?
The S11 series covers a capacity range from 10 kVA to 2500 kVA. The standard voltage configuration is 10 kV (high side) / 0.4 kV (low side), with high-voltage tapping options of ±5% or ±2×2.5%, making it suitable for a wide range of distribution network applications.
Q
How does the fully sealed design benefit long-term transformer performance?
The fully sealed structure completely isolates the transformer oil from the surrounding air, preventing oxidation, moisture absorption, and oil deterioration. This design fundamentally extends equipment service life to over 25 years, reduces maintenance frequency, and lowers overall lifecycle investment costs.
Q
What safety certifications does the S11 oil-immersed transformer hold?
The S11 series has passed ISO9001 quality management system certification and China's national 3C compulsory certification. It is equipped with multiple safety protection devices including pressure relief valves and gas relays, and is rated for stable operation in extreme temperatures from -40°C to 60°C.
Q
What is the function of the corrugated plate radiator used in the S11-M series?
The corrugated plate radiator utilizes the natural thermal expansion and contraction of the corrugated plates in response to oil temperature changes, effectively replacing the traditional oil conservator. This results in a more compact and elegant design, reduced equipment footprint, and simplified installation without compromising thermal management performance.
Q
What application scenarios is the S11 oil-immersed transformer suitable for?
The S11 series is suitable for a wide variety of applications including industrial factories, urban power distribution networks, commercial buildings, and new energy projects such as solar and wind power installations. Its customizable design, compact footprint, and broad capacity range make it a versatile and reliable choice for both standard and demanding power environments.