Repair of Category 4 Damage on TECSIS 50.2 Blade (GE 2.5 MW).
Repair of Category 4 Damage on TECSIS 50.2 Blade (GE 2.5 MW) Structural defects were located at the 11-meter mark of the TECSIS 50.2 blade installed on a GE 2.5 MW wind turbine. The service team's response was immediate—that same day, a 3-person technician team began rectifying the fault.
During a routine technical inspection, a severe horizontal crack passing through the outer, core (filling), and inner layers was identified. This damage was classified as Category 4.
Work Schedule:
Day 1 - Inner Layer Repair — Technicians first restored and rehabilitated the surface inside the blade structure. Working in a confined space required the involvement of a 3-person team.
Day 2 - Core Material Reconstruction — The crack formed at the interface of two distinct materials: PVC foam and balsa wood. This required precise core reconstruction using appropriate filler materials.
Day 3 - Grinding and Lamination — After replacing the core and repairing the inner layer, the technicians proceeded with grinding the laminate and rebuilding successive structural layers. Controlled post-curing (heating) was applied at every stage to ensure maximum strength properties.
Day 4 - Profiling and UV Protection — Surface profiling was performed to restore the blade's original aerodynamics, followed by the application of a protective UV coating.
Root Cause and Summary:
The analysis revealed that a primary cause of the failure was an improperly executed previous repair on the opposite side of the blade. Rapid degradation of that area led to uneven dynamic load distribution and structural damage.
Service work was completed in 4 days, minimizing downtime and quickly restoring the turbine to safe operation.
Key Takeaway - Wind turbine blades operate under extreme load conditions. Even minor microcracks or errors by previous service teams can lead to major failures. Regular blade inspections and professional composite servicing are essential to avoiding costly wind farm downtime.
