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LIBI – Lightning Interception Blade Implant
LIBI® – Lightning Interception Blade Implant
The Lightning Interception Blade Implant (LIBI®) is a new standard of lightning protection for wind turbine blades.
The LIBI solution is suitable for both new blades and for improving existing blades by retrofit.
By ensuring that lightning strikes are captured with high efficiency and safely directed down through the wind turbine blades, LIBI® offers complete protection from damages and downtime due to direct strikes to wind turbine blades.
Lightning-related damages are a major concern to the wind power industry and one of the main reasons for longer outages. Depending on location, topography, weather conditions, and wind turbine height, lightning can strike a wind turbine more than 25 times a year. This problem is growing in line with the height of wind turbines.
The taller the wind turbine, the higher the risk of direct lightning strikes. The tendency of moving wind turbines even further offshore, simply results in increased maintenance and repair costs.
Due to such extended lightning exposures, the operation and maintenance costs increase while the Annual Energy Production decrease, resulting in a higher Cost of Energy (CoE) than expected. Enhancing the performance of wind turbine lightning protection systems will help alleviate this problem.
LIBI® provides a cost-effective solution to lightning protection of the outermost 5m of a blade. This ensures high interception effectiveness when exposed to direct lightning strikes. The innovative blade concept has been designed using state-of-the-art technology and tested in excess of 200 kA using the GLPS testing facilities, guaranteeing that it can withstand the expected high impact from lightning strikes.
Furthermore, our concept adaptation process ensures quick and effective adaptation to the geometry of every specific blade design.
The LIBI® concept gives you the following unique advantages
LKDS - Lightning Key Data® System
Avoid unnecessary inspections and expensive downtime with valuable data allowing you to make the best decisions.
Lightning Key Data® System is a unique measurement system developed by GLPS. The system measures all relevant key parameters from a lightning strike in your wind turbine. Due to the individual impact of lightning on the exposed structure, the system provides important, useful and valuable information.
Knowing the exact time, peak current, specific energy, charge and rise time gives you a unique and accurate basis on which to make immediate and right decisions, such as whether the turbine can continue to operate safely or must be stopped immediately for inspection, and thereby avoiding stopping the turbine for no reason.
With Lightning Key Data® System you also avoid overlooking emerging and incipient vulnerabilities on electronics or lightning attachment point, which may have fatal consequences for the turbine if not taken care of in time.
Lightning Key Data® System provide the following information:
The maximum value of the lightning current measured in kilo-ampere. The peak current indicates the dynamic force, which can tear things apart.
A time integral of the square of the lightning current, identifying potential heating of inadequate connection components. The specific energy is a key parameter to monitor to determine how powerful the lightning strike has been.
Charge is the time integral of the current, also conducted for the full waveform. Charge creates erosion on attachment points – and in any transfer system involving moving parts.
Maximum rise time indicates how quickly the lightning current rises from zero to peak level. Valuable knowledge in trouble shooting involving EMI.
The total picture right away.
Lightning Key Data® System records the lightning strike in a time frame of 1.5s on each of the three channels. This ensures a measurement of the entire lightning incidence, and hence an accurate calculation of the four key parameters. Due to the system architecture, it is capable of measuring four consecutive events on each channel, to ensure that no strikes are missed during data processing.
The data recording is available by Ethernet communication either as the four key parameters or in full recording resolution - so you will know exactly what is going on. All data from the last three hundred lightning strikes are saved on the system.
LCS - Lightning Card System
The GLPS Lightning Card System is the simplest lightning registration available in the market.
Great emphasis has been put on safety, simplicity, and reliability in the development of the Lightning Card System. When a lightning strikes the blade or LPS system and is conducted to earth, a magnet field is created around the down conductor. The strength of the magnet field is proportional to the peak of the lightning current and decreases with the distance to the conductor. The Lightning Card is attached to the down conductor and the magnet field generated by the lightning will then be registered onto the card.
By assessing the registered magnetic field, the peak amplitude of the lightning current can be evaluated.
The system consists of three components
The Lightning Card measures lightning current in the down conductor by registering the magnitude of the magnetic field caused by the current. The measurement is a purely magnetic registration and the process is irreversible. A registered lightning event is stored and can only be overwritten by a lightning strike of higher magnitude.
Either by routine exchange or in expectation of a lightning strike, the card is replaced and extracted for reading. The Lightning Card cannot be re-installed if a lightning strike is registered.
The Lightning Card can register lightning strikes in the range of 6 – 300kA with accuracy better than 20kA. The Lightning Card is operational regardless of the humidity, in temperature range of -30°C – 80°C and can even withstand submersion in water over longer periods without effect to the card measurement performance.
It is intended for the Card Holder to be installed onto (attached to?) a lightning down conductor with cable ties. The holder supports the Lightning Card in a well-defined position to the down conductor. The holder is not influenced by lightning and will only need replacing if it has been mechanically damaged.
The Lightning Card Reader converts the Lightning Card measurement to a current reading in kA. The Lighting Card Reader reads the Lightning Card, the software then stores the data on a database and provides the possibility to report on the readout from the card. The system is powered from 12V thus can be supplied via a service car or simply via a normal socket. The reports are generated in the form of a PDF to be used as documentation of the measurement. Software is easily downloaded from our homepage.
The Lightning Card Reader is also able to read lightning registration cards from other manufacturers.
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