Why Is the S11 35KV Oil-Immersed Power Transformer the Smart Choice for Modern Power Systems?
2025-10-20
The S11 35KV Oil-immersed Power Transformer is a state-of-the-art electrical device designed for efficient power transmission and distribution in medium- to high-voltage networks. Known for its low loss, quiet operation, and exceptional durability, this transformer has become a preferred choice for power utilities, substations, and industrial applications.
Manufactured by Shanghai FATO Group Co., Ltd., the S11 transformer adopts advanced coil winding technology, optimized magnetic circuit design, and high-quality silicon steel sheets, ensuring excellent performance and reduced energy consumption. Its oil-immersed design provides efficient heat dissipation, prolonging the lifespan of internal components and improving insulation reliability even under harsh environmental conditions.
Why Should You Choose the S11 35KV Oil-Immersed Power Transformer?
The S11 series is an upgrade from previous S9 and S10 models, featuring significantly reduced no-load losses and noise levels. Its core structure is designed for high magnetic permeability, which minimizes vibration and power waste.
Key benefits include:
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High efficiency: Reduced core and copper losses ensure minimal energy waste.
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Excellent cooling performance: Oil circulation design provides superior thermal stability.
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Enhanced safety: Built with reliable insulation materials and protective devices.
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Long service life: Resistant to aging and moisture, ensuring stable long-term operation.
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Low maintenance requirements: Simple structure with easy oil monitoring and minimal parts replacement.
These features make it an ideal choice for urban power grids, rural power stations, renewable energy systems, and heavy industrial applications.
What Are the Technical Specifications of the S11 35KV Oil-Immersed Power Transformer?
Below is a general technical data sheet for reference:
| Parameter | Specification |
|---|---|
| Rated Voltage | 35kV |
| Rated Capacity | 630kVA – 31500kVA |
| Frequency | 50/60Hz |
| Cooling Method | ONAN / ONAF (Oil Natural Air Natural / Oil Natural Air Forced) |
| Vector Group | Dyn11 or Yyn0 |
| No-load Loss | 0.3% lower than S9 model |
| Load Loss (at 75°C) | ≤ Standard GB/T1094.1 |
| Insulation Class | Class A |
| Impedance Voltage | 6.5% ±10% |
| Tap Changer | Off-circuit or on-load tap changer |
| Noise Level | ≤ 55 dB |
| Cooling Medium | Mineral Transformer Oil or Environmentally Friendly Oil |
| Operating Altitude | ≤ 1000 m (customizable for higher altitude) |
| Temperature Rise (Oil/Winding) | ≤ 60K / ≤ 65K |
| Standard Compliance | GB1094, IEC 60076, ANSI C57 |
How Does the S11 35KV Oil-Immersed Power Transformer Work?
The S11 transformer operates through electromagnetic induction between primary and secondary windings, with oil serving as both an insulating and cooling medium.
When electrical current passes through the primary winding, a magnetic field is induced in the laminated silicon steel core. This field transfers energy to the secondary winding, converting high-voltage electricity into lower, usable levels.
The transformer oil plays a crucial role by:
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Insulating internal components from electrical discharge.
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Dissipating heat generated during operation.
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Protecting the winding and core from oxidation.
This mechanism ensures stable, safe, and continuous power supply with optimized efficiency across all load conditions.
Where Can the S11 35KV Oil-Immersed Power Transformer Be Used?
The S11 model is widely applied across various sectors:
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Power Generation Plants: For step-up and step-down voltage control.
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Substations: Ensures smooth power transmission between grids.
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Industrial Facilities: Maintains reliable electricity for manufacturing and processing.
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Renewable Energy Systems: Supports wind and solar farms for energy conversion.
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Residential and Commercial Zones: Delivers safe and efficient electricity distribution.
Its robust design makes it suitable for both indoor and outdoor installations, even in environments with high humidity, temperature fluctuations, or dust exposure.
What Distinguishes the S11 35KV Oil-Immersed Power Transformer from Other Models?
Compared to traditional transformers, the S11 series offers significant technological improvements:
| Feature | S9 Model | S11 35KV Oil-Immersed Transformer | Improvement |
|---|---|---|---|
| Core Material | Cold-rolled silicon steel | High-grade grain-oriented silicon steel | Reduced core loss |
| No-load Loss | Higher | 30–40% lower | Improved efficiency |
| Noise Level | Moderate | Lower by 5–8 dB | Quieter operation |
| Cooling System | Standard | Enhanced oil circulation design | Better heat dissipation |
| Service Life | 15–20 years | 25–30 years | Extended durability |
This superior performance makes the S11 series a cost-effective, eco-friendly, and future-ready solution for modern energy networks.
FAQ: Common Questions About S11 35KV Oil-Immersed Power Transformer
Q1: What is the lifespan of the S11 35KV Oil-Immersed Power Transformer?
A1: The typical service life exceeds 25 years, depending on installation environment and maintenance. Regular oil testing and insulation checks can further extend its lifespan.
Q2: How often should the transformer oil be replaced or maintained?
A2: Transformer oil should be inspected every 2–3 years for moisture, acidity, and dielectric strength. Replacement depends on oil condition, but many S11 units can run for over 10 years without major maintenance.
Q3: Can the S11 35KV Oil-Immersed Power Transformer operate in extreme climates?
A3: Yes. The transformer is engineered to withstand temperatures from -25°C to +45°C. For colder or higher-altitude regions, Shanghai FATO Group Co., Ltd. offers customized insulation and cooling solutions.
Q4: What makes the S11 transformer more energy-efficient than earlier models?
A4: Its high-grade silicon steel core, optimized magnetic design, and tight winding structure reduce no-load losses by up to 40%, improving energy efficiency and cutting long-term operational costs.
Why Partner with Shanghai FATO Group Co., Ltd.?
With over 30 years of experience in electrical equipment manufacturing, Shanghai FATO Group Co., Ltd. is a trusted global supplier of transformers, switchgear, and power distribution systems. The company's strict quality control, international certifications, and dedicated R&D team ensure that every product meets or exceeds industry standards.
Each S11 35KV Oil-Immersed Power Transformer is factory-tested for efficiency, safety, and durability, offering clients reliable solutions backed by professional technical support and after-sales service.
Contact Shanghai FATO Group Co., Ltd.
For more information or to request a quote for the S11 35KV Oil-Immersed Power Transformer, please contact:
Shanghai FATO Group Co., Ltd.
📍 Address: No. 6558 Yinggang East Road, Qingpu Industrial Zone, Shanghai
📞 Phone: +86-18662318620
📧 Email: [email protected]
🌐 Website: www.sh-fato.com
The S11 35KV Oil-Immersed Power Transformer combines efficiency, durability, and advanced engineering—making it the preferred choice for modern power distribution networks. Whether you're upgrading an existing substation or developing a new grid project, this transformer ensures reliable performance, reduced energy loss, and long-term operational stability under any condition.
