Oil-Immersed Distribution Transformer Price Guide 2025 | Specifications & Buying Tips
10-14 2025 | By:
Oil-Immersed Distribution Transformer Price Guide 2025 | Specifications & Buying Tips
As power demand continues to grow worldwide, choosing a reliable oil-immersed distribution transformer becomes crucial for stable and efficient power systems.
This 2025 price guide by ZTelec China helps you understand transformer types, specifications, and factors that affect cost—so you can make the right purchasing decision for your project.
What Is an Oil-Immersed Distribution Transformer?
An oil-immersed distribution transformer uses insulating mineral oil for cooling and insulation.
The oil not only helps dissipate heat from the windings and core but also improves dielectric strength, ensuring long service life and reliable performance.
They are widely used in industrial facilities, substations, and utility power distribution networks.
ZTelec China – Reliable Manufacturer of Oil-Immersed Transformers
With over 20 years of experience in transformer insulation and power equipment manufacturing,
ZTelec China supplies customized oil-immersed distribution transformers from 100kVA up to 31500kVA.
Our transformers are designed according to IEC, ANSI, and GB standards and tested before delivery to ensure consistent performance and safety.
Oil-Immersed Rectifier Transformer
Key Advantages of ZTelec Oil-Immersed Transformers
- High-quality silicon steel core for reduced no-load loss
- Excellent heat dissipation and insulation reliability
- Low noise operation and compact structure
- Energy-efficient design compliant with IEC 60076
- Customizable voltage levels (6kV–35kV)
- Factory-direct price and global technical support
1000kva KNAN Oil Immersed Power Distribution Transformer
Oil-Immersed Transformers Common Models and Applications
Oil-immersed transformers come in various models designed to meet different power distribution requirements.
Each type has unique structural characteristics and performance advantages.
Below we summarize the most common models used in industrial, utility, and infrastructure projects, along with their typical application scenarios.
| Model | Rated Capacity Range (kVA) | Voltage Class (kV) | Core Material | Cooling Type | Main Features |
|---|---|---|---|---|---|
| S10Series | 30–31500 | 6–35 | Grain-oriented Silicon Steel | ONAN | Classic model, reliable and economical; used for rural and general power distribution. |
| S11 Series | 50–31500 | 10–35 | High-quality Cold-rolled Silicon Steel | ONAN / ONAF | Low no-load loss, low noise, high efficiency; widely used in urban power grids and factories. |
| S13 Series | 100–31500 | 10–35 | Step-lap Core Structure | ONAN / ONAF | Upgraded energy-saving design; 30% lower no-load loss compared to S11; ideal for smart grid and continuous load systems. |
| SH15 Series (Amorphous Alloy Core) | 50–31500 | 10–35 | Amorphous Alloy | ONAN | Ultra-low energy loss, suitable for areas with strict energy-saving regulations. |
| S(B)H15 Sealed Type | 100–31500 | 10–35 | Amorphous Alloy | ONAN (Sealed Tank) | Fully sealed design; maintenance-free and oil oxidation resistant; ideal for residential areas and green energy projects. |
Amorphous alloy transformer
Oil-Immersed Transformers Application Scenarios
Oil-immersed distribution transformers are used in a wide range of applications.
They are preferred in environments where high insulation, strong cooling capability, and stable voltage regulation are required.
Below are typical application areas:
- Industrial Plants: For machinery, motors, and production lines requiring steady voltage supply.
- Utility Substations: Used by power companies for medium-voltage power distribution networks.
- Renewable Energy Projects: In solar and wind farms to step up or step down voltage between generation and grid connection.
- Urban and Rural Power Grids: For municipal lighting, commercial buildings, and residential communities.
- Mining and Oil Fields: Designed to withstand harsh environmental conditions and heavy loads.
- Railway and Transportation Systems: To ensure stable power supply for signaling and traction systems.
oil-immersed type transformer
With its proven reliability and cost-effectiveness, the oil-immersed distribution transformer remains the most widely used transformer type globally.
At ZTelec China, our transformers are engineered for long service life, high energy efficiency, and easy installation,
making them an ideal choice for various industrial and infrastructure projects.
Amorphous alloy oil immersed transformer
Oil-Immersed Distribution Transformer Price Range (2025)
The price of oil-immersed transformers in 2025 varies depending on capacity, voltage class, copper/aluminum winding choice, and cooling method.
Below is an estimated price reference based on international market data from ZTelec China.
| Rated Capacity | Voltage Class | Core Type | Estimated FOB Price (USD) |
|---|---|---|---|
| 100 kVA | 10 kV | S11 | $1,200 – $1,600 |
| 630 kVA | 10 kV | S13 | $3,800 – $4,500 |
| 2000 kVA | 35 kV | S11-M | $9,500 – $12,000 |
*Note* For reference only （Customization is accepted. Please send detailed parameters and specifications to get the best quotation.）
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