What Is a 25 kVA Oil Immersed Transformer?
Jan 22, 2026
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Are you searching for a compact, efficient power distribution solution for small-scale projects?
As a trusted power equipment manufacturer founded in 2008, GNEE has 18+ years of expertise in producing 25 kVA Oil Immersed Transformer models that meet global standards (IEC, CE, GB). Our factory-direct supply eliminates middlemen, offering competitive pricing while ensuring quality-ideal for residential, commercial, and rural power needs. We provide end-to-end support, from customization to after-sales service.
Production line for GNEE's 25 kVA Oil Immersed Transformer, ensuring consistent quality.
What Exactly Is a 25 kVA Oil Immersed Transformer?
A 25 kVA Oil Immersed Transformer is a small-capacity power device designed to step down high voltage (e.g., 10kV/6kV) to low voltage (0.4kV) for safe, efficient electricity distribution. The "25 kVA" rating refers to its apparent power capacity-enough to supply 80–120 average households, a small retail store, or a rural farm.
Unlike dry-type transformers, it uses high-grade mineral insulating oil (compliant with IEC 60296) for cooling and insulation. The oil absorbs heat from internal copper windings and iron cores, then dissipates it naturally (ONAN cooling method), enabling continuous operation without overheating. Its sealed steel tank also protects internal components from dust, moisture, and harsh weather.
Key Specifications of 25 kVA Oil Immersed Transformer
GNEE's 25 kVA Oil Immersed Transformer adheres to strict technical standards, with customizable parameters to fit project needs. Below are the standard specs:
| Parameter | Specification |
|---|---|
| Rated Capacity | 25 kVA |
| Primary Voltage | 10kV / 6kV (customizable) |
| Secondary Voltage | 0.4kV (3-phase, 4-wire) |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN (Oil Natural, Air Natural) |
| Insulation Class | Class A (max temp: 105°C) |
| Temperature Rise | ≤55K (top oil) / ≤80K (winding) |
| Protection Level | IP23 (dust-proof, splash-proof) |
| Weight | Approx. 550kg |
| Dimensions (L×W×H) | 1200mm × 850mm × 1100mm |
| Service Life | 25+ years |
Clear specification label on GNEE's Oil Immersed Transformer, showing voltage and capacity details.
Top Applications of 25 kVA Oil Immersed Transformer
The compact size and weather resistance of 25 kVA Oil Immersed Transformer make it suitable for small-scale power distribution scenarios:
Rural Electrification: Powers remote villages or farms, connecting to high-voltage grid lines and converting power for households, irrigation pumps, and small agricultural machinery.
Residential Neighborhoods: Supplies electricity to small housing blocks (80–120 homes), supporting daily appliances like air conditioners, refrigerators, and lighting.
Small Commercial Spaces: Meets power needs of convenience stores, small restaurants, or local offices-handling mixed loads from POS systems, HVAC units, and signage.
Infrastructure Auxiliary Power: Provides backup power for road toll booths, small communication towers, or water pump stations in remote areas.
Price Factors of 25 kVA Oil Immersed Transformer
When budgeting for a 25 kVA Oil Immersed Transformer, key factors affect the final price:
- Raw Material Quality: Models with high-purity copper windings (vs. aluminum) or premium insulating oil cost 10–15% more but offer better efficiency and longer life.
- Customization Needs: Adjusting voltage (e.g., 20kV primary), adding smart monitoring sensors, or upgrading to IP44 protection increases costs by 5–20%.
- Order Quantity: Bulk orders (10+ units) qualify for 8–12% factory discounts from GNEE.
- Shipping & Installation: Local delivery (within 500km) adds 3–5% to the price; remote areas or on-site installation may increase costs by 8–12%.
Conclusion
GNEE's 25 kVA Oil Immersed Transformer is a reliable, cost-effective solution for small-scale power distribution-ideal for rural areas, small neighborhoods, and commercial spaces. With 16 years of manufacturing expertise, we ensure quality, customization, and competitive pricing for every order.
To get a personalized quote, view real-world application cases, or request a technical datasheet, contact us now-and explore our full product details via the [25 kVA Oil Immersed Transformer product page].
We'll help you find the perfect power solution for your project.