Overview / Product Introduction for 400kVA Medium Voltage Oil-Immersed Distribution Transformer
The 400kVA Three-Phase Oil-Immersed Power Transformer manufactured by Yawei Transformer is an industrial-grade solution designed for utility networks, industrial plants, substations, commercial complexes, renewable energy installations, and critical infrastructure projects worldwide. Built to comply with IEC, ANSI, IEEE, and GB/T standards, this transformer delivers high reliability, low losses, and efficient medium-voltage power distribution.
Supporting medium voltage from 6kV to 35kV and customizable capacities from 50kVA to 10,000kVA, this transformer provides flexible configurations for diverse industrial, utility, and substation power requirements. Its three-phase oil-immersed design ensures long-term operational stability, high dielectric strength, and safe performance under heavy load and extreme environmental conditions.
The 400kVA model is ideal for industrial plants, renewable energy projects, municipal grids, commercial buildings, and large-scale infrastructure. Advanced design features include high-efficiency windings, robust insulation, and oil cooling systems, which reduce energy loss and extend service life. Factory direct supply, OEM customization, and global wholesale solutions make it an excellent choice for B2B clients seeking medium-voltage, industrial-grade transformers.
Technical Specifications & Electrical Parameters for 400kVA Three-Phase Oil-Immersed Distribution Transformer
| Parameter | Specification |
|---|---|
| Rated Capacity | 400kVA (customizable, typical range 50–10,000kVA) |
| Primary Voltage | 6kV, 10kV, 15kV, 20kV, 35kV (customizable) |
| Secondary Voltage | Standard low-voltage options 230V, 400V, 480V, or project-specific |
| Transformer Type | Three-Phase Oil-Immersed Power Transformer / Industrial Distribution Transformer |
| Cooling Method | ONAN (Oil Natural Air Natural), optional ONAF (Oil Natural Air Forced) for high-load operation |
| Installation Type | Indoor, outdoor, substation, floor-mounted, or enclosure-installed |
| Winding Configuration | Grounded Wye / Wye or Delta; other vector groups available |
| Voltage Regulation | Off-circuit tap changer standard; optional On-Load Tap Changer (OLTC) for dynamic voltage control |
| Insulation System | Mineral oil with conservator tank and breather, eco-friendly, high dielectric strength |
| Applicable Standards | IEC, ANSI, IEEE, GB/T |
| Typical Applications | Industrial plants, utility networks, substations, renewable energy projects, commercial and infrastructure installations |
| Manufacturer / Supplier | Yawei Transformer – Factory direct, wholesale, OEM, custom solutions |
| Global Delivery | USA, Canada, UK, Germany, France, Spain, Italy, Australia, Mexico, Argentina, Brazil, worldwide |
Testing & Quality Assurance for Medium Voltage Oil-Immersed Transformers
Every 400kVA oil-immersed transformer undergoes extensive testing to ensure international compliance, operational reliability, and long-term performance:
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Routine Electrical Tests: insulation resistance, winding resistance, voltage ratio, load loss, and no-load loss verification
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High Voltage Tests: lightning impulse test, dielectric strength testing for medium and high-voltage applications
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Temperature Rise Tests: confirming thermal stability under maximum load conditions
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Noise & Vibration Tests: ensuring low operational noise and minimal vibration for industrial and substation environments
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Oil Quality Tests: dielectric strength, moisture content, chemical stability tests to ensure transformer longevity
These measures guarantee that the transformer meets global performance standards and operates reliably in diverse industrial and utility projects.
Materials & Components for High-Efficiency Three-Phase Oil-Immersed Transformers
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Core Material: Cold-rolled grain-oriented silicon steel for high magnetic efficiency and low core loss
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Windings: High-purity copper or aluminum conductors with epoxy insulation for maximum reliability
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Insulation System: Mineral oil with conservator tank and silica gel breather, eco-friendly and high dielectric strength
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Tank & Structure: Heavy-duty steel tank with anti-corrosion coating suitable for indoor and outdoor installation
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Bushings & Accessories: High-voltage porcelain bushings, conservator, oil level indicator, pressure relief device, tap changer options
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Cooling System: ONAN standard, optional ONAF for high-load or high-temperature environments
Maintenance & Operation Guidelines for 400kVA Medium Voltage Oil-Immersed Transformers
Proper maintenance enhances transformer life, operational efficiency, and safety:
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Oil Level & Quality Monitoring: Check dielectric strength regularly
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Visual Inspection: Detect leaks, corrosion, or damage to bushings, tank, and accessories
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Temperature Monitoring: Ensure operation within rated temperature range
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Load Monitoring: Avoid prolonged overload to prevent accelerated aging
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Scheduled Maintenance: Regular cleaning and inspection of conservator, breather, and cooling systems
Technical support is provided for maintenance optimization and operational guidance.
Shipping, Installation & Packaging for B2B Global Delivery
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Robust Packaging: Steel frame support, shockproof cushioning, moisture-proof wrapping
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Customs Documentation: Export-ready paperwork for international shipments
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Global Delivery: Fast, secure delivery to USA, Canada, UK, Germany, France, Spain, Italy, Australia, Mexico, Argentina, Brazil, and worldwide
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Bulk & Wholesale Orders: Efficient handling for multiple units supporting large-scale industrial and utility projects
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Installation Guidance: On-site technical instructions for safe placement, grounding, and connection
Key Features & Advantages of 400kVA Three-Phase Oil-Immersed Power Transformer
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Medium voltage 6kV–35kV, three-phase design for utility, industrial, and substation applications
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Customizable capacity 50–10,000kVA to match project requirements
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High efficiency, low loss, reliable long-term performance
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Wide application range: industrial plants, utility networks, substations, renewable energy projects, commercial infrastructure
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Factory direct supply, wholesale, OEM, and custom solutions
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Compliance with IEC, ANSI, IEEE, GB/T standards ensures safety, quality, and international acceptance
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Global sales and delivery coverage
Applications of 400kVA Oil-Immersed Distribution Transformer
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Industrial factories, manufacturing plants, chemical and mining sites
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Municipal and utility power networks, substation upgrades
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Renewable energy distribution (solar, wind, hybrid power)
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Commercial complexes, airports, hospitals, data centers
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Smart grid infrastructure and critical utility projects
Project Case Studies
Project 1: Manufacturing Plant Medium-Voltage Upgrade
400kVA three-phase oil-immersed transformer installed to support 20kV medium-voltage distribution. Stable operation under heavy loads ensured continuous production.
Project 2: Solar Farm Substation
Multiple 400kVA oil-immersed transformers used in a solar farm substation to manage medium-voltage power efficiently across varying loads.
Project 3: Municipal Grid Modernization
Transformers installed in municipal substations upgraded local networks, flexible primary voltage configurations (6kV–20kV) allowed seamless integration, improving grid reliability.
Project 4: Data Center Power Reliability
Three-phase oil-immersed transformers deployed for a large data center, ensuring stable medium-voltage supply and uninterrupted IT operations.
Project 5: Mining Facility Power Distribution
400kVA Distribution transformers installed to supply stable medium-voltage power for mineral processing equipment, withstanding harsh environmental conditions.
FAQ – 400kVA Medium Voltage Oil-Immersed Transformers
Q1: Can the transformer be customized for specific voltages?
A1: Yes, primary voltages up to 35kV and secondary voltages per project specification.
Q2: Expected service life?
A2: 25–30 years with proper maintenance.
Q3: Suitable for outdoor installation?
A3: Yes, corrosion-resistant tanks and robust insulation support outdoor use.
Q4: Are OEM and wholesale options available?
A4: Yes, global factory direct supply and bulk order solutions are provided.
Q5: Are technical drawings included?
A5: Full technical drawings and documentation assist installation and maintenance.
Q6: Can it handle continuous high-load industrial operation?
A6: Yes, ONAN/ONAF cooling and high-quality windings ensure stable operation.
Q7: Compliance with international standards?
A7: Fully compliant with IEC, ANSI, IEEE, and GB/T standards.
Q8: Is remote monitoring or smart grid integration supported?
A8: Optional remote monitoring and control features can be integrated for modern grid applications.
Conclusion
The 400kVA Three-Phase Oil-Immersed Power Transformer is a high-performance, reliable, and scalable solution for industrial, utility, and substation power systems worldwide. Its medium voltage flexibility (6kV–35kV), customizable capacity (50–10,000kVA), and robust oil-immersed three-phase design make it ideal for industrial plants, municipal networks, renewable energy projects, commercial buildings, and critical infrastructure.
Factory direct supply, OEM and wholesale solutions, full compliance with IEC, ANSI, IEEE, GB/T standards, and global shipping coverage make it an optimal choice for B2B clients seeking high-efficiency, medium-voltage, three-phase oil-immersed distribution transformers.
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