Optical cables, higher precision, more security

As modern wind turbines grow in size, so do the challenges to their safety and economic efficiency. Rotor blades now reach lengths of over 140 meters – and with them, the risk of material damage, ice buildup, and costly downtime increases. With Bladecontrol NXT, Weidmüller Monitoring Systems is introducing a new generation of rotor blade monitoring technology that detects damage earlier, locates it more precisely, and makes wind farm operation significantly more efficient.

Rotor Blade Monitoring Becomes a Key Technology

Rotor blades are considered the most stressed components of a wind turbine. In addition to wind and dead loads, lightning strikes and icing also constantly affect the structure. Damage can not only increase downtime and costs but also compromise safety.

Condition monitoring and structural health monitoring are two established methods already in use in the industry – Bladecontrol NXT now takes these to a new technical level.

Setting New Standards: Optical Energy Transmission and MEMS Sensors

At the heart of the innovation is metal-free data and energy transmission via fiber optics. This ensures:

• Complete electrical insulation and improved lightning protection
• Greater flexibility in sensor placement
• More accurate data acquisition

State-of-the-art MEMS sensors measure movements in all six degrees of freedom at two positions per rotor blade. Optionally, microphones also capture acoustic signals, enabling the detection of even the smallest cracks or fiber damage.

Early detection saves millions

A single blade failure can quickly cost several hundred thousand euros – in addition to expenses for cranes, transport, and downtime. Thanks to high-resolution, real-time data acquisition and intelligent algorithms, Bladecontrol NXT enables early detection, which massively reduces the risk of damage and makes maintenance intervals more predictable. Weidmüller estimates the savings potential at up to a factor of 30 compared to conventional repair and downtime costs. Specifically, this means that for a 12 MW offshore wind turbine, the loss of revenue per day amounts to approximately €18,000. In this particular case, the downtime was reduced by 50 to 70 days thanks to preventive damage detection – compared to a potential blade loss.

Transparent Data Analysis with WebVis

For operators and service teams, transparent processing of measurement data is of paramount importance. With the Bladecontrol condition monitoring system, even the smallest structural changes to rotor blades are reliably detected by highly sensitive sensors – before they can develop into critical damage or failures. The browser-based WebVis platform presents this information clearly, enables real-time tracking of the rotor blade condition, facilitates the identification of critical events, and supports informed maintenance decisions – regardless of location or device. WebVis thus ideally complements the hardware by ensuring transparency and rapid, decisive action. In addition, Weidmüller Monitoring Systems offers a comprehensive monitoring service based on continuous, data-driven 24/7 monitoring of the rotor blades.

A particular advantage for offshore wind farms

Due to their size and harsh environmental conditions, offshore installations place special demands on monitoring. Thanks to optical transmission and the ability to position sensors deep within the blade, Bladecontrol NXT is ideally suited for this application. More than 7,000 Weidmüller systems are already in operation worldwide – and the new generation is designed to particularly benefit large turbines in the 5 to 7 MW range.

Future Strategy: Modular and Scalable

Bladecontrol NXT is part of a comprehensive monitoring strategy. In addition to rotor blade monitoring, Weidmüller is developing other systems such as BOLTcontrol for bolt breakage detection and TwinCap® for blade bearing monitoring. These systems will be modularly combinable in the future – for greater transparency, increased safety, and reduced investment costs.

Conclusion: Monitoring Reimagined

With Bladecontrol NXT, Weidmüller is launching a solution that goes far beyond traditional ice detection. Optical data transmission, advanced sensor technology, and real-time analysis make rotor blade monitoring more precise, reliable, and economical – a crucial step for the future of large onshore and offshore wind farms.