10kV S11 Energy-Efficient Oil-Immersed Distribution Transformer

The 10kV S11 (S20/S22)-M series oil-immersed distribution transformer is a new generation of high-efficiency and environmentally friendly power equipment designed for modern power distribution systems.

It adopts high-quality cold-rolled grain-oriented silicon steel core with a 45° fully mitered joint structure, ensuring low no-load loss, reduced noise, and excellent energy performance.

With its compact design and reliable operation, this transformer is widely used in:

• Urban and rural power grids
• Industrial and mining enterprises
• Power distribution upgrades and reconstruction projects
• Compact prefabricated substations (package substations)

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🔹 Standards Compliance

This transformer is designed and manufactured in accordance with international and Chinese standards:

• IEC 60076-1 – Power Transformers
• GB/T 1094.1 – Power Transformers
• GB/T 6451 – Technical Parameters and Requirements for Oil-Immersed Transformers
• JB/T 10088 – Sound Level of 6kV–500kV Transformers
• GB 20052-2020 – Energy Efficiency Limits and Grades for Power Transformers

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🔹 Key Features

✔ High Energy Efficiency

• Complies with the latest energy efficiency standards
• Significantly reduced no-load loss and operating cost
• Ideal for energy-saving power distribution systems

✔ Low Noise Operation

• Optimized core structure minimizes vibration
• Suitable for residential and noise-sensitive environments

✔ Compact & Reliable Design

• Space-saving structure for easy installation
• Perfect for box-type substations

✔ Strong Short-Circuit Resistance

• Advanced winding structure ensures high mechanical strength
• Excellent stability under sudden short-circuit conditions

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🔹 Structural Design

🔸 Core

• Made of high-permeability grain-oriented silicon steel
• Multi-step core structure (3-joint / 5-joint / 7-joint options)
• Fully mitered joints for:
  • Lower loss
  • Reduced noise

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🔸 Windings

• High-quality enameled copper wire (QQ type)
• Oxygen-free copper conductors
• Available winding types:
  • Cylindrical
  • Continuous
  • Helical
  • Foil winding

➡ Provides:

• Excellent electrical strength
• Strong mechanical performance
• Efficient heat dissipation

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🔸 Oil Tank

• Fabricated from high-quality steel plates
• Available structures:
  • Oval tank
  • Rectangular tank
• Cooling methods:
  • Radiator fins
  • Corrugated tank
• Surface treatment:
  • Acid cleaning & phosphating
  • Three-coat-one-finish painting

➡ Features:

• Strong corrosion resistance
• Reliable sealing performance
• Long service life

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🔹 Applications

• Power grid distribution systems
• Industrial plants and factories
• Renewable energy integration systems
• Prefabricated (compact) substations
• Infrastructure and urban construction projects

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🔹 Advantages Summary

• Energy-saving & eco-friendly
• Low noise & low loss
• High reliability
• Long service life
• Suitable for modern smart grids

❓ FAQ

1️⃣ What is the difference between S11, S20, and S22 transformers?

The main difference lies in energy efficiency and loss performance.

• S11: Standard energy-saving model
• S20: Lower no-load loss, improved efficiency
• S22: Ultra energy-efficient, meets higher energy-saving standards

👉 Choosing S20 or S22 can significantly reduce long-term operating costs, especially for large-scale power distribution projects.

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2️⃣ Can this transformer be customized for specific project requirements?

Yes, the transformer can be fully customized based on your project needs, including:

• Rated capacity (kVA)
• Voltage levels (HV/LV)
• Vector group
• Cooling method
• Installation type (indoor/outdoor, substation use)

👉 Custom solutions are widely used in industrial plants, substations, and renewable energy systems.

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3️⃣ Is this transformer suitable for use in compact substations?

Yes, the S11 (S20/S22)-M series is specifically designed for compact prefabricated substations.

It features:

• Compact structure
• Low noise operation
• Reliable sealing performance

👉 This makes it ideal for urban distribution networks and space-limited installations.