Wind Turbine Blade Mesh Laminate for Lightning Current Equalization
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Solution Overview
Problem
Wind turbine blades face issues with lightning strikes and static electrical potential, leading to damage and electronic disturbances due to the use of electrically conductive fibers like carbon fibers, which conduct current and heat up, and the need for increased rigidity and lower weight in larger blades.
Innovation Solution
Incorporating a metal mesh layer with apertures and transversely extending electrically conductive fibers to connect with a fiber-reinforced layer, enhancing mechanical stability and equalizing electrical potential, thereby protecting the laminate from lightning strikes and static charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If electrically conductive fibres (e.g., carbon fibres) are used in hybrid laminates to reduce blade weight and increase rigidity, then mechanical properties are improved, but the blade becomes vulnerable to lightning strikes and static electrical potential damage due to electrical conductivity
Solution Approach 1:
A metal mesh layer is introduced as an intermediary component between the fibre-reinforced layers. This mesh layer acts as a mediator that provides a controlled electrical pathway for lightning current, preventing it from traveling through the conductive carbon fibres in the laminate. The mesh layer is electrically connected to lightning rods or grounding systems, safely directing the electrical energy away from the blade structure.
Solution Approach 2:
The solution employs a composite structure combining traditional fibre-reinforced polymer layers with a metal mesh layer. This hybrid composite material system integrates the mechanical benefits of carbon/glass fibres with the electrical protection capabilities of the metal mesh, creating a multi-functional laminate that addresses both structural and electrical protection requirements.
2Reliability
If a metal mesh layer is added to provide lightning protection and electrical potential equalization, then electrical protection is improved, but mechanical stability may be compromised and delamination risk increases
Solution Approach 1:
The metal mesh layer is integrated and merged with the fibre-reinforced layers through transverse electrical conductive fibres that pass through the mesh apertures. This merging creates a unified composite structure where the mesh and fibre layers work together mechanically and electrically, preventing delamination while maintaining electrical protection functionality.
Solution Approach 2:
The metal mesh layer is strategically positioned within specific regions of the blade structure where electrical potential equalization is most critical. The mesh density, aperture size, and material properties are locally optimized to provide adequate electrical protection while minimizing impact on mechanical properties. The transverse conductive fibres are placed at key interfaces to ensure both mechanical bonding and electrical connectivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved mechanical stability, reduces delamination, and effectively equalizes electrical potential, preventing damage from lightning strikes and static electrical potential, while maintaining the structural integrity and weight efficiency of the blades.
Implementation Method 1
at least a number of the plurality of second electrically conductive fibres extend transversely through the plurality of apertures of the metal mesh layer so as to electrically connect the at least first fibre-reinforced layer with the metal mesh layer
Implementation Method 2
Infusion of the fibres may be provided by vacuum assisted resin transfer moulding (VARTM)
Data Source
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AI summary
The present disclosure relates to a wind turbine blade part for a wind turbine blade, the wind turbine blade part comprising a metal mesh layer comprising a plurality of apertures, at least a first fibre-reinforced layer comprising a plurality of first electrically conductive fibres, and a plurality of second electrically conductive fibres. At least a number of the plurality of second electrically conductive fibres extend transversely through the plurality of apertures of the metal mesh layer so as to electrically connect the at least first fibre-reinforced layer with the metal mesh layer.