11kV Oil Immersed Distribution Transformer (6kV to 22kV Line)

Comprehensive Structural Blueprint for Oil-Immersed Transformers

The drawing below illustrates the standard layout, key components, and internal configuration of our three-phase oil-immersed distribution transformers. From high-voltage bushings to the hermetically sealed corrugated cooling fins, every detail is engineered for optimal thermal performance and grid reliability.

💡 Need a Tailored Design for Your Project?

We understand that every power grid, solar plant, or industrial substation has unique spatial and technical restrictions. Our in-house engineering team provides 100% full OEM/ODM customization. We can modify:

Overall dimensions and footprint to fit into tight spaces or specific enclosures.

Bushing positions (top-mounted or side-mounted) and terminal configurations.

Special accessories integration (Buchholz relays, temperature controllers, pressure relief devices).

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This is a three-phase oil-immersed transformer designed for 6–22kV medium-voltage power grids and 50/60Hz AC systems. It is used for voltage transformation, power distribution, and transmission. Common models include the energy-saving series such as S11‑M / S13 / S20 / S22 (High-efficiency & Eco-design series meeting Tier 2 energy-saving requirements), which are widely used in industries, new energy sectors, urban and rural power grids, and commercial facilities.

Ⅰ. Key Technical Parameters (IEC standard)

All parameters can be customized to meet specific national standards (e.g., GOST, CSA) or project requirements.

II. Structural and Material Advantages

• Iron core: It adopts high-grade oriented silicon steel sheets (such as Baosteel/Wuhan Iron and Steel), with a stepped seam process, achieving low loss, low noise, and high magnetic permeability.
• Winding: oxygen-free copper conductor (high conductivity), H62 conductive rod, featuring low load loss, good heat dissipation, and strong short-circuit resistance.
• Insulation system: Utilizing brand-new mineral insulating oil (with the option of FR3 vegetable oil for environmental protection and flame retardancy), combined with high-strength insulating paper/board, it boasts a long insulation lifespan and excellent aging resistance.
• Oil tank and sealing: Fully sealed corrugated oil tank (S11-M and above), without oil conservator, with oil volume changes automatically compensated by corrugated sheets, isolated from air, moisture-proof and dust-proof, maintenance-free, with a service life of >30 years.
• Protection and Safety: With IP65 protection, it is equipped with a pressure relief valve, a Buchholz relay, and a temperature measuring element. It can be equipped with alarm/trip contacts.

III. Performance Features

• High efficiency and energy saving: The no-load loss of S11 is about 30% lower than that of S9; S20/S22 has a further reduction of 30%+ compared to S11, with an efficiency of >99%, meeting the national standard GB/T 6451 and European Tier 2 energy efficiency.
• Low noise and environmental protection: With vibration reduction design for the iron core and winding, the noise level is ≤55dB(A); biodegradable oil option is available, making it environmentally friendly.
• High reliability: Fully sealed, corrosion-resistant, and with strong weather resistance, it can operate stably for extended periods in an environment ranging from -25°C to +40°C and at an altitude of up to 4,000m.
• Maintenance-free: The fully sealed structure isolates moisture and oxygen, reducing maintenance costs by approximately 50%. The design lifespan is 25-30 years.
• Strong overload capacity: The copper winding can be overloaded to 150% of the rated capacity for a short period of time (≤2 hours), meeting peak load demands.

IV. Typical application scenarios

• Urban and rural power grids: 6–22kV distribution stations, residential areas/commercial centers distribution
• Industry: power supply for mining, metallurgy, chemical, textile, and manufacturing workshops
• New energy: photovoltaic/wind power station step-up/grid connection, energy storage system
• Infrastructure: airports, ports, rail transit, data centers

V. Implementation Standards and Certification

• National standards: GB 1094, GB/T 6451
• International: IEC 60076, ISO 9001, CE (GOST, UL, CSA, and other certifications available).

Advanced Transformer Manufacturing Workshop & Quality Control

As a leading power equipment manufacturer, Meibian Electric operates a modernized facility equipped with automated winding machines, precision core stacking equipment, and an advanced high-voltage testing lab. Every transformer undergoes strict inspection before leaving the factory.

Need a Reliable Partner for Your Substation or Power Grid Project?

Contact our engineering and sales team today to get customized technical proposals and competitive factory-direct quotes!

📧 Email: liwang337922@gmail.com

💬 WhatsApp: +86-13337937922

(Or click the "Get a Quote" button at the top to submit your detailed specifications.)