The 500kVA 6.6/0.4kV oil-immersed distribution transformer is designed for efficient medium-voltage to low-voltage power conversion. It steps down 6.6kV distribution voltage to 400V for industrial, commercial, and utility applications. Featuring a low-loss CRGO core, high-quality insulation system, and robust oil cooling design, the transformer delivers reliable operation, excellent energy efficiency, and long service life even in harsh environmental conditions. It is widely used in Africa, Southeast Asia, the Middle East, and South America for power distribution, infrastructure development, and renewable energy projects.
The 500kVA 6.6/0.4kV Oil-Immersed Distribution Transformer is designed to efficiently step down medium-voltage power from 6.6kV to 400V for industrial, commercial, utility, and renewable energy applications. Manufactured with high-quality CRGO silicon steel cores and premium copper or aluminum windings, the transformer delivers excellent energy efficiency, low losses, and reliable long-term performance.
Featuring an advanced oil-immersed cooling system, the transformer provides superior heat dissipation, strong overload capability, and excellent resistance to short-circuit stresses. Its robust tank structure and high-quality insulation system ensure stable operation even under harsh environmental conditions such as high temperatures, high humidity, and dusty outdoor environments.
Designed and manufactured in accordance with IEC 60076 and other international standards, the 500kVA transformer is widely used in power distribution networks, industrial facilities, mining projects, commercial buildings, infrastructure developments, and solar power plants. Customized solutions are available to meet specific voltage, frequency, impedance, vector group, and installation requirements for different project applications.
Zisheng are a professional 19+ years manufacturer in producing Oil-Immersed Transformers, Compact Substation, Pad Mounted Transformers, Pole Mounted Transformers and Dry Type Transformers. We own the certificates of ISO/CE/IEC 60076 and TUV Rheinland.
Transformers undergo rigorous FAT and type testing, support voltage/capacity customization. Welcome to consult for Catalog and Product. you can contact us at email [email protected].
This case involves the supply of a 500kVA 6.6kV/0.4kV oil-immersed distribution transformer for a medium-voltage power distribution system. The transformer is designed to step down medium voltage (6.6kV) to low voltage (400V), ensuring stable and efficient power supply for industrial and commercial loads.
The project required high reliability, low losses, and strong overload capacity to support continuous operation in demanding environments.
This transformer is widely used in:
High Efficiency & Low Losses
Strong Overload Capability
Excellent Thermal Performance
High Reliability & Long Service Life
Flexible Customization
The transformer is typically installed in:
It is delivered fully tested, oil-filled, and ready for grid connection after on-site installation and commissioning.
The deployment of the 500kVA 6.6/0.4kV transformer successfully ensured:
| Item | Specification |
|---|---|
| Product Name | 500kVA Oil-Immersed Distribution Transformer |
| Rated Capacity | 500 kVA |
| High Voltage | 6.6 kV |
| Low Voltage | 0.4 kV (400/230V) |
| Phase | Three Phase |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Vector Group | Dyn11 (customizable) |
| Tap Changer | Off-Circuit Tap Changer ±2×2.5% or ±5% |
| Insulation Class | Class A |
| Core Material | High-Grade CRGO Silicon Steel |
| Winding Material | Copper or Aluminum (optional) |
| Insulating Medium | Mineral Oil / FR3 Natural Ester Oil (optional) |
| Standards | IEC 60076, ANSI/IEEE, EN 50588-1 |
| Installation | Outdoor / Indoor |
| Protection Class | IP44-IP54 (customizable) |
| Efficiency | Up to 99%+ |
| Service Life | 25+ Years |
Source specifications are consistent with common 500kVA distribution transformer designs and 6.6kV/0.4kV configurations used in utility, industrial, and commercial power distribution.
It steps down medium voltage 6.6kV to low voltage 0.4kV (400V) for safe and stable power distribution in industrial and commercial applications.
It uses ONAN (Oil Natural Air Natural) cooling, which ensures efficient heat dissipation and stable long-term operation without external cooling equipment.
It is widely used in factories, mining sites, commercial buildings, infrastructure projects, and renewable energy substations.
Key advantages include low loss design, high efficiency, strong overload capability, stable performance, and long service life.
Yes. Voltage level, vector group, tap changer type, protection devices, and accessories can all be customized according to project requirements.
Yes. It is designed for continuous duty with strong short-circuit resistance and stable thermal performance.
It is typically manufactured in accordance with IEC 60076 standards, and can also be customized to meet ANSI or other regional standards.
No. The sealed oil-immersed design significantly reduces maintenance needs, requiring only periodic inspection and routine testing.
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