High-efficiency, hermetically sealed oil-filled transformers for medium-voltage grids — 25 – 4000 kVA — for grid infrastructure, utilities and industrial applications across Europe.
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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 directly from stock in Emmen, ensuring the fastest possible delivery for your project.
Designed for outdoor installation and built to last decades, Protrafo oil-type distribution transformers meet all IEC 60076 and EU Ecodesign TIER 2 requirements. From 25 kVA up to 4000 kVA, we offer a wide range of capacities to fit your project.
At Protrafo, we understand the urgency of your energy needs. That's why we guarantee rapid production and shipping, ensuring your transformer arrives on time, every time – no delays, no excuses!
All Protrafo transformers are designed and manufactured in strict accordance with IEC 60076 standards, ensuring the highest levels of safety, performance, and reliability across all applications.
Our dedicated service team is available around the clock, 365 days a year, across the entire European Union – ready to respond swiftly to any situation, wherever you are.
We stand behind the quality of every transformer we build. Protrafo offers industry-leading warranty coverage of up to five years, giving you complete peace of mind.
Hermetically sealed design with no need for oil top-up or regular oil sampling in most applications, reducing operational costs over the product lifecycle.
Core and coil construction optimized to minimize vibration and acoustic noise, suitable for noise-sensitive environments near residential areas.
Suitable for utilities, industrial sites, renewable energy parks, and infrastructure projects requiring reliable outdoor power distribution.
Designed to meet EU TIER 2 Ecodesign requirements with low no-load and load losses, reducing carbon footprint across the asset lifetime.
With proper maintenance, oil-type transformers can operate reliably for 30 to 40 years, delivering excellent total cost of ownership.
Standard pad-mount, pole-mount, and ground-mount configurations with plug-in bushings available for rapid, secure grid integration.
All units are designed, tested and certified to IEC 60076 and relevant EU directives, ensuring regulatory compliance wherever you operate.
A wide selection of standard capacities and voltage ratios is available directly from our warehouse in Emmen for immediate dispatch.
Protrafo delivered our distribution units ahead of schedule and the factory test reports were spotless. Talking to the same engineers from quote to commissioning made all the difference.
Start your project
Choose a fast budget indication in three fields, or a full formal quote — valid for 30 days.
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.
Each transformer is engineered to your exact specifications, with detailed calculations for losses, impedance, and thermal performance.
Manufactured with care in state-of-the-art facilities. Our team follows strict quality standards to ensure durability and efficiency.
Before any transformer leaves our facility, it undergoes comprehensive routine and type tests per IEC 60076 to guarantee optimal performance.
We coordinate every shipment with precision. Our logistics partners ensure your transformer arrives safely, on time, and ready for installation.
On-site commissioning support available on request to ensure a smooth, safe energization and integration into your network.
Every transformer is tested, certified and shipped with the paperwork to prove it — so what you specify is exactly what you energise.
Each transformer completes full routine testing before it leaves our factory. No exceptions.
Temperature-rise, short-circuit and dielectric tests available on request — witnessed if you wish.
You receive the complete factory acceptance test certificate with each transformer we deliver.
Up to a five-year warranty, ex-stock units and rapid EU-wide delivery — backed 24/7.
Frequently asked questions about oil-type distribution transformers. 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 due to thermal issues.
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 in days for standard configurations.
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 — making them ideal for outdoor use, higher capacities, and long-distance power distribution.
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, reliability, and a long operational lifespan, making it the standard choice for grid infrastructure.
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 oil also inhibits oxidation and moisture ingress.
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 excellent thermal performance in all weather conditions.
Start your project
Get an indicative budget price in three fields, or a full formal quote — valid for 30 days. We typically respond within one business day.
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