Protrafo was called in to perform a critical repair on a medium-voltage transformer at a solar park in Sleen, located in the northeast of the Netherlands. The transformer showed signs of irregular operation, threatening downtime for the entire PV installation.
Following a rapid assessment by our service team, the fault was traced to an internal insulation issue. The transformer was carefully disconnected and transported to our workshop for a full inspection and repair.
The repair scope included:
Partial rewinding of the high-voltage winding
Oil filtration and replacement with fresh insulating oil
Thermal and insulation testing according to IEC standards
Final functional test and on-site recommissioning
Thanks to Protrafo’s efficient repair process and close coordination with the site operator, the transformer was back in operation within a matter of days—ensuring continued renewable energy production without long-term disruption.
This project underlines Protrafo’s strength in fast, reliable service for renewable energy applications across the Netherlands and beyond.
Protrafo takes a structured, hands-on approach to every transformer repair project. From initial fault diagnosis to final recommissioning, we manage the entire process to minimize downtime and restore operational reliability as quickly as possible. Our team coordinates transport (if required), arranges testing, sources critical components, and ensures that repairs meet all relevant standards. Whether on-site or in our workshop, every step is carefully managed with clear communication and technical precision—so you can focus on your operations while we restore your transformer to full performance.
Fast turnaround on critical repairs
Every unit is tested according to IEC standards to ensure full reliability.
Field services available for inspections, minor repairs, and condition assessments.
From coil rewinding to ECODESIGN compliance—your transformer, up to date and future-ready.
Cast resin (dry-type) transformers require minimal maintenance. Routine visual inspections, dust removal, and checking for signs of overheating or insulation wear are usually sufficient. Unlike oil-filled units, they do not require oil testing or leak monitoring, making them ideal for low-maintenance environments.
The typical lifespan of a transformer ranges from 25 to 40 years, depending on the type, load conditions, maintenance, and operating environment. With proper care and monitoring, such as using systems like Protrafo Insights®, transformers can operate reliably for several decades.
Yes, we provide on-site coordination and, if required, technical assistance to ensure a smooth installation process.
Yes, Protrafo provides on-site diagnostics and repairs where possible, including thermal imaging, insulation tests, and minor component replacement. For complex repairs, the transformer may be transported to our partner facilities.
Repair lead times vary based on damage severity and parts availability. However, with our dedicated service team and stock of critical components, we can often provide rapid turnaround, including emergency interventions.
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