1. Product Overview – Three Phase Oil-Immersed Medium Voltage Distribution Transformer
The 225 kVA three phase oil-immersed distribution transformer is a core product for medium voltage power distribution systems used by electric utilities, industrial facilities, and commercial power networks. Designed for reliable voltage transformation in IEC-based grids, this oil-filled distribution transformer supports common medium voltage levels such as 11kV, 20kV, and 33kV, making it suitable for power distribution projects across Africa, Europe, Asia, the Middle East, and other global markets.
As an oil-immersed medium voltage transformer, it provides excellent insulation performance, stable thermal behavior, and long operational life. This three phase distribution transformer is widely installed in secondary substations, utility feeder networks, industrial substations, and commercial distribution systems where stable voltage regulation, low losses, and high reliability are required.
2. Technical Parameters and Capacity Range – Medium Voltage Distribution Transformer Specifications
| Item | Specification |
|---|---|
| Transformer Type | Three Phase Oil-Immersed Medium Voltage Distribution Transformer |
| Rated Capacity | 100 kVA, 150 kVA, 200 kVA, 225 kVA, 315 kVA, 400 kVA, 500 kVA, 630 kVA, 800 kVA, 1000 kVA, scalable up to 5000 kVA |
| Primary Voltage | 11kV, 20kV, 33kV, customized medium voltage levels |
| Secondary Voltage | 400Y/230V, 415V, optional 480Y/277V |
| Frequency | 50Hz / 60Hz |
| Cooling | ONAN oil-immersed cooling |
| Phase Configuration | Three Phase |
| Connection | Delta–Wye or Wye–Wye |
| Standards | IEC distribution transformer standards, ANSI and IEEE optional |
| Installation | Outdoor substation installation, ground-mounted |
This wide capacity and voltage range allows the oil-immersed distribution transformer to be standardized across multiple medium voltage power distribution projects while maintaining flexibility for different load demands.
3. Oil-Immersed Design and Cooling Performance of Medium Voltage Transformer
The oil-immersed design is essential to the performance of this three phase medium voltage distribution transformer. Transformer insulating oil provides dual functions of electrical insulation and heat dissipation, ensuring stable operation under continuous load and peak load conditions.
The ONAN cooling method enables natural oil circulation and air cooling without forced ventilation, improving reliability and reducing maintenance. Compared with dry-type transformers, oil-filled medium voltage transformers offer higher overload capability, improved thermal stability, and longer service life, particularly in outdoor substations and high ambient temperature environments.
4. Electrical Design and Voltage Adaptability for Utility Distribution
This three phase oil-immersed distribution transformer is engineered for high adaptability to different utility and industrial voltage systems. Primary voltage options of 11kV, 20kV, and 33kV cover the most widely used medium voltage distribution levels in IEC markets.
On the secondary side, standard low voltage outputs such as 400Y/230V and 415V are optimized for residential, commercial, and industrial loads. Optional low voltage configurations including 480Y/277V support export projects and mixed-standard power systems. Voltage tapping ranges and impedance levels can be customized to improve voltage regulation and system efficiency.
5. Mechanical Structure and Tank Construction of Oil-Filled Transformer
The oil-immersed distribution transformer features a sealed steel tank designed for long-term outdoor operation in utility substations and industrial environments. The tank structure provides strong resistance to corrosion, moisture ingress, and mechanical stress.
Internal core and winding assemblies are mechanically reinforced to withstand transportation vibration and short-circuit forces. Standard accessories such as lifting lugs, earthing terminals, conservator or sealed tank design, and porcelain or polymer bushings ensure safe installation and stable long-term operation.
6. Standards, Testing, and Quality Control for Distribution Transformers
Each three phase oil-immersed medium voltage distribution transformer is manufactured and tested in accordance with IEC standards. Routine tests include ratio verification, insulation resistance measurement, winding resistance testing, and load and no-load loss testing.
Type tests and special tests can be performed based on project specifications or utility requirements. Optional compliance with ANSI and IEEE standards supports international export and OEM supply for different regional markets.
7. Typical Applications of 225 kVA Medium Voltage Distribution Transformers
This oil-immersed medium voltage distribution transformer is widely applied in:
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Utility distribution substations and feeder networks
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Industrial plants and manufacturing facilities
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Commercial buildings, shopping centers, and business parks
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Infrastructure projects and municipal power systems
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Rural electrification and grid expansion programs
Its flexible voltage configuration and reliable oil-filled design make it suitable for both new installations and system upgrades.
8. Application Case Studies – Oil-Immersed Distribution Transformer Projects
Utility Distribution Project in Africa
Multiple 225 kVA and 315 kVA oil-immersed distribution transformers operating at 33kV/400V were deployed in regional substations, providing stable power supply under high ambient temperature conditions.
Industrial Power System in Southeast Asia
An industrial customer selected 225 kVA oil-filled medium voltage transformers with 20kV primary voltage to support continuous production loads, achieving improved voltage stability and reduced operational losses.
Commercial Distribution Network in Europe
For a commercial power distribution project, 225 kVA transformers with 11kV/415V configuration were installed, ensuring efficient and reliable power delivery for mixed commercial loads.
9. OEM Customization and Engineering Support for Medium Voltage Transformers
PowerNex provides comprehensive OEM customization services for three phase oil-immersed distribution transformers. Customizable parameters include voltage ratios, impedance values, loss optimization, insulation class, cooling configuration, tank structure, and monitoring accessories.
This OEM capability enables utilities, EPC contractors, and power distributors to deploy medium voltage transformers that precisely match local grid requirements, operating environments, and long-term reliability expectations.
10. Manufacturing Capability and Global Supply of Distribution Transformers
PowerNex operates a complete in-house manufacturing system covering core lamination, winding production, tank fabrication, assembly, oil filling, and final testing. This full industrial chain ensures consistent quality control, flexible customization, and competitive factory-direct pricing.
Oil-immersed distribution transformers from PowerNex are supplied globally to the United States, Canada, Brazil, Argentina, Mexico, Venezuela, Australia, New Zealand, Indonesia, Malaysia, the Philippines, Saudi Arabia, the United Arab Emirates, Germany, France, Russia, South Africa, and other international markets.
11. Why Choose PowerNex as Your Oil-Immersed Distribution Transformer Manufacturer
PowerNex is a China-based leading manufacturer, supplier, wholesale exporter, and OEM factory of medium voltage oil-immersed distribution transformers. Key advantages include:
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Proven manufacturing experience in IEC medium voltage transformers
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Broad capacity range from small distribution units to large substation transformers
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Flexible OEM and customization capability
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Global export experience and technical support
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Stable quality assurance and competitive pricing
12. Conclusion and Call to Action – 225 kVA Medium Voltage Distribution Transformer
The 225 kVA three phase oil-immersed distribution transformer represents a reliable, efficient, and field-proven solution for medium voltage power distribution across utility, industrial, and commercial applications. Based on a scalable design platform, this transformer is part of a broader capacity range covering typical ratings such as 100 kVA, 150 kVA, 200 kVA, 225 kVA, 300KVA,315 kVA, 400 kVA, 500 kVA, 630 kVA, 800 kVA, 1000 kVA, and higher capacities for substation-level distribution projects.
Supporting common medium voltage systems used in Asia, Europe, and Africa, the transformer accommodates primary voltages such as 11 kV, 20 kV, and 33 kV, along with standard low voltage outputs including 400Y/230 V and 415 V. Customized voltage ratios, impedance levels, loss optimization, and configuration options are available to meet local grid standards, operating environments, and project-specific technical requirements.
PowerNex, a China-based leading power transformer manufacturer, supplier, wholesale exporter, and OEM factory, provides factory-direct supply of oil-immersed medium voltage distribution transformers for global markets. Whether for utility substations, industrial facilities, commercial developments, or infrastructure projects, PowerNex supports customized production, bulk supply, and long-term cooperation.
Contact PowerNex today to request pricing, technical drawings, OEM customization details, or wholesale procurement solutions, and secure reliable, efficient, and long-lasting medium voltage transformer solutions for your power distribution projects worldwide.
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