Oil Immersed Distribution Transformer

Transpower Electrical Equipment Co., Ltd. is one of the most reliable manufacturers and suppliers of oil immersed distribution transformer in China. Welcome to buy high quality customized products at competitive price from our factory. Contact us for quotation.

Oil Immersed Distribution Transformers are engineered for reliable and efficient voltage conversion across utility networks, industrial facilities, commercial buildings, and renewable energy projects.

Using mineral oil or environmentally friendly insulating fluids for electrical insulation and thermal management, these transformers provide effective heat dissipation, stable insulation performance, and reliable operation under continuous load conditions. Compared with many dry-type transformer solutions, oil immersed transformers offer strong thermal capability, high overload tolerance, and cost-effective performance for medium and large-scale distribution systems.

Serving global wholesalers, EPC contractors, electrical distributors, and system integrators, we provide customized transformer solutions supported by controlled manufacturing processes, technical documentation, and reliable international supply capabilities.

Energy-Efficient Core and Winding Design
Optimized CRGO Silicon Steel Core
The transformer core uses high-quality grain-oriented silicon steel (CRGO) with optimized magnetic circuit design to reduce no-load losses and improve energy efficiency.
Step-lap core construction helps reduce magnetic flux distortion, while precision manufacturing improves electrical performance and long-term operational stability.
Benefits include:
Reduced energy losses during continuous operation
Improved transformer efficiency
Stable performance for utility and industrial applications
Strong Mechanical Performance
Copper or aluminum windings are manufactured with precision-controlled processes to provide reliable mechanical strength and withstand electromagnetic forces during short-circuit conditions.

Advanced Thermal Management and Insulation
Transformer oil functions as both an insulation medium and cooling medium, transferring heat away from internal components while maintaining dielectric strength.
Designed according to project requirements, transformer solutions can be adapted for different environmental conditions, including:
High-temperature regions
High-humidity environments
Coastal areas requiring enhanced corrosion protection
Outdoor power distribution systems
Cooling configurations include:
ONAN (Oil Natural Air Natural)
ONAF (Oil Natural Air Forced) options for applications requiring additional cooling capacity

Durable Tank Design and Protection Options
The transformer tank is manufactured using high-strength steel materials with protective coating systems to improve mechanical durability and environmental resistance.
Available configurations include:
Hermetically sealed tank designs
Conservator tank structures
Customized protection accessories
Optional monitoring and safety components include:
Pressure relief devices
Oil level indicators
Winding temperature indicators
Buchholz relays (for applicable designs)
With proper installation and maintenance, these transformers are designed for long-term service in power distribution networks.

Flexible OEM and Project Customization
Different markets and electrical systems require different technical configurations. We provide customized transformer solutions according to customer specifications.
Customization options include:
Primary and secondary voltage configurations up to 35kV
50Hz / 60Hz frequency options
Vector groups such as Dyn11, Yyn0, and customized configurations
No-load tap changer (NLTC) or on-load tap changer (OLTC)
Copper or aluminum winding options
OEM nameplates and technical documentation
Engineering documents such as general arrangement drawings and technical datasheets can be prepared to support project approval and tender submissions.

Our manufacturing process covers core processing, winding assembly, tank fabrication, oil filling, assembly, testing, and final inspection.
Each production stage is controlled to ensure consistent quality for repeat orders and project-based supply.

Quality control procedures include:
Raw material inspection
Core and winding inspection
Winding resistance testing
Voltage ratio verification
Insulation resistance testing
Dielectric strength testing
No-load and load loss measurement
Factory acceptance testing (FAT)

Technical documentation can be provided according to project requirements, including:
Product datasheets
General arrangement drawings
Test reports
Installation manuals
Packing documentation
Third-party inspection and customer witness testing can also be arranged according to project requirements.

Utility Power Distribution
Used for medium voltage to low voltage conversion in public and private electrical distribution networks.

Industrial Power Systems
Suitable for manufacturing plants, mining projects, processing facilities, and industrial infrastructure requiring reliable electricity supply.

Renewable Energy Projects
Applied in solar farms, wind power systems, and grid connection applications.

Commercial Infrastructure
Used in buildings, transportation facilities, and large-scale development projects.

For global wholesalers and project contractors, reliable supply, technical support, and product consistency are essential.
Our capabilities include:
Stable production support for bulk and repeat orders
Flexible transformer configurations for different markets
Complete technical documentation for project evaluation
Factory testing before shipment
Export packaging suitable for international transportation
OEM and distributor cooperation support
These advantages help partners reduce procurement risks and provide reliable transformer solutions to their customers.

Hot Tags: oil immersed distribution transformer, China oil immersed distribution transformer manufacturers, suppliers, factory