The 1250 kVA three-phase step-down distribution transformer is an industrial-grade, oil-immersed transformer designed for medium- and low-voltage power distribution in industrial, commercial, utility, and infrastructure projects. Engineered for high efficiency, reliable performance, and long service life, it converts 11 kV/33 kV to 400 V, suitable for indoor, outdoor, or substation installations worldwide.
🔹 Key Specifications
| Parameter | Details |
|---|---|
| Rated Capacity | 1250 kVA (customizable, typical range 50–12,500 kVA) |
| Phase | Three-Phase |
| Primary Voltage | 11 kV, 22 kV, 33 kV (customizable) |
| Secondary Voltage | 400 V, 415 V, 480 V, 230 V, or project-specific |
| Transformer Type | Oil-Immersed, Step-Down Distribution Transformer |
| Installation Type | Indoor, outdoor, substation, pad-mounted, or enclosure-installed |
| Cooling Method | ONAN (natural oil), optional OFAF (forced oil cooling) |
| Winding Configuration | Grounded Wye / Wye, Delta, or custom vector groups |
| Voltage Regulation | Off-circuit tap changer (standard); optional OLTC |
| Insulation System | Mineral oil-immersed, eco-friendly, conservator tank, breather, protective devices |
| Applicable Standards | IEC / ANSI / IEEE / GB/T |
| Dimensions (L×W×H) | Typical: 2500 × 1500 × 2200 mm (customizable) |
| Weight | Approx. 5,200 kg (depends on voltage and configuration) |
🔹 Design Features
- High-Efficiency Core: CRGO silicon steel laminated core reduces no-load and load losses.
- Heavy-Duty Construction: Steel tank with anti-corrosion coating suitable for outdoor exposure.
- Flexible Voltage Configurations: Wide range of primary and secondary voltages to suit various projects.
- Advanced Cooling System: ONAN for standard loads; optional OFAF for high-load operation.
- Precision Tap Changers: Off-circuit or On-Load Tap Changer for exact voltage regulation.
- Eco-Friendly Insulation: Mineral oil system with conservator tank, breather, and protective devices.
- Custom Vector Groups: Delta or Wye configurations to meet specific network requirements.
🔹 Testing & Quality Assurance
Every 1250 kVA transformer undergoes comprehensive factory testing to ensure performance and safety:
- Routine and type tests per IEC, ANSI, IEEE, GB/T standards
- Dielectric and insulation resistance tests
- Load loss and no-load loss measurement
- Temperature rise and cooling efficiency tests
- Noise level measurement
- Visual inspection and oil leak testing
- ONAN and OFAF cooling verification
All transformers come with complete test reports, datasheets, and certification for global projects.
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🔹 Dimensions & Weight
- Typical Dimensions (L×W×H): 2500 × 1500 × 2200 mm (can vary depending on configuration)
- Weight: ~5,200 kg depending on voltage, cooling, and accessories
- Designed for safe transport and installation, including lifting lugs and base mounting provisions
🔹 Typical Applications
- Industrial Facilities: Manufacturing plants, heavy machinery, production lines
- Commercial Buildings: Offices, malls, hospitals, data centers
- Utility Networks: Urban and rural substations, medium-voltage distribution systems
- Renewable Energy Projects: Solar farms, wind farms, hybrid energy systems
- Infrastructure Projects: Airports, ports, transportation hubs, public utilities
🔹 Price & Ordering
The price of a 1250 kVA oil-immersed transformer depends on:
- Primary and secondary voltage configuration
- Cooling type (ONAN or OFAF)
- Tap changer type (Off-Circuit or OLTC)
- Vector group and optional accessories
- Shipping location and quantity
Contact us directly for a competitive quotation including technical specifications, shipping cost, and lead time. Factory-direct supply ensures best pricing for bulk orders or project-based procurement.
🔹 Why Choose This Transformer
- Customizable design for industrial, commercial, and utility applications
- High-efficiency oil-immersed transformer for long-term reliability
- International standard compliance: IEC, ANSI, IEEE, GB/T
- Suitable for indoor, outdoor, and substation installations
- Optional features: OLTC, OFAF, special vector groups, and protective devices
- Factory-direct pricing, technical support, and global shipping
🔹 Key Advantages
- High Efficiency & Low Loss: Energy-saving design with optimized core and winding
- Durable Construction: Heavy-duty tank, corrosion-resistant, reliable for outdoor use
- Flexible Configuration: Voltage, tap changers, and vector groups customizable
- Reliable Cooling: ONAN/OFAF ensures optimal performance under full load
- Global Compliance: Meets international standards for diverse applications
🔹 FAQ – Frequently Asked Questions
Q1: What is the price of a 1250 kVA transformer?
A1: The price depends on your voltage configuration, cooling method, tap changer, and accessories. Contact us for a personalized quotation with shipping and lead time details.
Q2: Can this transformer be installed outdoors?
A2: Yes, it is designed for indoor, outdoor, or substation installation. Outdoor units include anti-corrosion coating and weatherproof accessories.
Q3: How is shipping handled for large transformers?
A3: The transformer is shipped factory-direct with secure packaging and lifting provisions. Large units can be transported via container or flatbed depending on size and destination.
Q4: Is there a warranty?
A4: Yes, all transformers come with a standard 12–24 months warranty covering manufacturing defects and material faults. Extended warranty options are available.
Q5: Can the transformer be customized?
A5: Absolutely. Primary/secondary voltages, tap changers, vector groups, cooling methods, and accessories can be customized for your specific project.
🔹 Call to Action – Get a Quote Today
Looking for a high-quality 1250 kVA oil-immersed step-down transformer for your project?
- Custom voltage and configuration options
- Factory-direct pricing and fast lead time
- Full technical documentation and testing certificates
- Global delivery and installation support
Request a quotation now and get technical drawings, datasheets, and a competitive price within 24 hours.
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