Oil-type Distribution Transformers

Protrafo's oil type transformers

Exceptional quality and efficiency

Our hermetically sealed transformers are designed for high efficiency, minimizing energy losses during power transmission and reducing overall energy consumption. Many standard configurations are available from stock.

Smart Monitoring Systems: Our transformers come equipped with intelligent monitoring solutions that track key parameters like temperature, oil levels, and pressure in real time — enabling predictive maintenance and enhancing operational safety.
ECODESIGN Compliant Efficiency: Designed to meet TIER2 ECODESIGN standards, our transformers are built for sustainability, offering exceptional energy efficiency with significantly reduced environmental impact.
Vacuum Oil Filling for Purity: Each transformer is filled using a vacuum oil-filling process to eliminate moisture and air, maximizing dielectric strength and ensuring optimal thermal performance.
Silent and Efficient Operation: Engineered for low sound emissions and minimal energy losses, our transformers are ideal for urban and noise-sensitive environments without compromising performance.
Built for Harsh Conditions: With corrosion-resistant coatings and reinforced tank structures, Protrafo transformers are made to thrive in demanding environments, from coastal areas to industrial zones.
Safety-First Protection Features: Advanced protection systems, including pressure relief devices and temperature sensors, ensure reliable operation and safeguard both the transformer and its surroundings.

From Design to Delivery

A Proven Process You Can Rely On

At Protrafo, every transformer goes through a streamlined process — from engineering to delivery. Each step is handled by specialists to ensure top quality and reliability. Need a unit quickly? View our current inventory.

Engineering and Production

Each transformer is engineered and crafted with care in state-of-the-art facilities. Our production team follows strict quality standards to ensure durability, efficiency, and long-lasting performance.

Testing

Before any transformer leaves our facility, it undergoes extensive testing. Our engineers verify every detail to guarantee optimal safety, performance, and compliance with international standards.

Precision in Supply Chain , Logistics and Delivery

We coordinate every shipment with precision. Whether it’s local or international, our logistics partners ensure your transformer arrives safely, on time, and ready for installation.

Frequently Asked Questions

Frequently Asked Questions and answers. Can't find what you're looking for? Request a quote — or explore our cast resin transformers and power transformers.

Our oil-filled transformers use advanced oil cooling technology to efficiently dissipate heat and reduce energy losses. This ensures stable voltage regulation, improved power quality, and minimal downtime, making them a cost-effective solution for your power distribution needs.

Production time for an oil-filled transformer typically ranges from 6 to 12 weeks, depending on the specifications, capacity, and required certifications. For urgent projects, Protrafo can deliver from stock or offer accelerated production in coordination with our manufacturing partners. Custom-built units with special features may require additional lead time.

Dry-type transformers use air for cooling and solid insulation, making them suitable for indoor environments where fire safety is a concern. Oil-filled transformers use liquid insulation and oil for cooling, offering higher efficiency, better overload capacity, and longer lifespan. They are typically used outdoors or in high-power applications. Each type is chosen based on the specific safety, performance, and environmental requirements of the installation.

An oil-filled distribution transformer is a high-performance electrical device that uses insulating oil to cool and insulate its windings. This design provides excellent heat dissipation and reliability, making it the ideal choice for industrial and utility applications where efficiency and long-term performance are critical.

Transformer oil serves two key purposes: insulation and cooling. It insulates internal components to prevent electrical faults and helps dissipate heat generated during operation. High-quality mineral or synthetic oils, such as MIDEL, also enhance fire safety and extend transformer lifespan.

Delivery times depend on the specifications and current market conditions. Standard oil-type distribution transformers are regularly available directly from our stock in Emmen, which means delivery within days rather than months. Custom-built units with specific voltages, vector groups or accessories are produced to order; lead times for these are considerably longer, so early planning pays off. Check our online inventory for transformers that are available immediately, or request a quote and we will confirm the exact lead time for your specification.

Yes. Oil-type distribution transformers are the standard choice for outdoor use. The hermetically sealed tank protects the active part against moisture and contamination, while the mineral oil provides both insulation and cooling. With the appropriate protection class and a corrosion-resistant finish, they perform reliably in substations, solar parks, industrial sites and other outdoor environments across all European climate zones.