The invention provides a lightning protection system for wind turbine blades with optimized injection means of lightning currents in conductive components of their shells. The injection means comprise a current receptor element (27; 47; 67) connected to the input cable of lightning currents and arranged over an area of a shell close to an electrically conductive component (22; 42; 62) and a current injection element (28; 48; 68; 69, 69′) arranged over the electrically conductive component (22; 42; 62) and connected to the current receptor element (27; 47; 67) by at least two distribution cables (31, 32; 51, 52, 53; 71, 72, 73, 74).

A monitoring system for a wind turbine blade, wherein the wind turbine blade includes an electrically conducting or semi-conducting structural component and a lightning protection system having a down conductor electrically connected to an lightning receptor, wherein the down conductor is electrically connected to the structural component by an equipotential connector, such that, a network of electrical impedances including the structural component, the equipotential connector and the down conductor is formed, whereby the hybrid monitoring system includes, a sensing device for the network, including a transmitter for emitting an electrical pulse into the network via a first terminal and a receiver for receiving a reception pattern of the electrical pulse from the network via a second terminal, and an evaluation device for evaluating the reception pattern to determine a first health information regarding the lightning protection system, and a second health information regarding the structural component, is provided.

Provided is a wind turbine blade for a wind turbine, including a web extending along a longitudinal direction of the blade, an electrically conductive beam extending along the longitudinal direction of the blade and being connected to the web, a lightning conductor extending along the longitudinal direction of the blade and being attached to the web, and a ply including carbon fibers, wherein the ply is attached to both the lightning conductor and the beam to electrically connect the lightning conductor to the beam. This has the advantage that an extensive and a continuous electrical connection between the lightning conductor and the beam is provided and that a plurality of cables electrically connecting the lightning conductor with the beam may be substituted.

Disclosed is a spar beam and a wind turbine blade comprising a spar beam. The wind turbine blade comprising a first blade section extending along a longitudinal axis from a root to a first end and a second blade section extending along the longitudinal axis from a second end to a tip. The spar beam comprises a conductive beam sheath circumscribing at least a beam sheath angular distance of the spar beam about the spar beam axis and longitudinally extending from a fourth beam axis position to a fifth beam axis position.

The present device is a vertically oriented wind turbine blade having a rectangular simple curvilinear shaped blade, which includes a top edge, a bottom edge, an outer edge, an inner edge, an inner surface and an outer surface. The blade is formed using extrusion to approximate a uncompleted airfoil shape from the inner edge to the outer edge (relative to the turbine center or hub). The angle of attack, the solidity and the arms angle are designed to improve performance at low wind speeds.

A sparcap for a spar structure inside a wind turbine blade is provided. A down conductor element is integrated on a side of the sparcap such that after assembly of the sparcap into the spar structure, the down conductor element extends along an outer corner of the spar structure.

Provided is a method of manufacturing an adaptable pre-cast resin-infused carbon-fiber beam, which method includes the steps of arranging a plurality of elongate carbon-fiber blocks side by side; arranging sheets to enclose the blocks and to extend over opposing faces of adjacent blocks; arranging the sheets to converge as an outwardly projecting elongate bead at a junction between adjacent blocks; and pulling on the elongate bead to inhibit resin flow between blocks during a resin infusion step. Also provided is a pre-cast adaptable carbon-fiber beam manufactured using that method; a method of manufacturing a wind turbine rotor blade; and a wind turbine rotor blade.

The present disclosure provides a lightweight spar cap with a concave structure for a wind turbine blade and a manufacturing method thereof, a wind turbine blade and a manufacturing method thereof. The lightweight spar cap is groove-shaped as a whole, and includes supporting portions located on two wings of the lightweight spar cap and an intermediate connecting portion connecting the two supporting portions. The manufacturing method of the lightweight spar cap includes laying a reinforcing body of the intermediate connecting portion and a supporting material of the supporting portion, and performing resin infusion. By comprehensively considering multiple factors, the present disclosure reduces the weight of the wind turbine blade, improves the material utilization of the wind turbine blade, and realizes a lightweight wind turbine blade.

A wind turbine blade comprising a lightning protection system, which is at least partly disposed in an inboard portion of the blade. The lightning protection system comprises a down conductor cable having root and tip portions having insulation with different electrical breakdown voltages. The lightning protection system may comprise a down conductor cable portion and a supporting component to hold the cable portion in free space in a position near or on a camber line of the blade aerofoil section, so that the cable portion is spaced apart from at least one electrically conductive structural component; and/or a plurality of inboard down conductor cables and a diverging electrical junction.

Provided is a method for fabrication of a profile for a spar cap for a wind turbine blade, wherein the profile is fabricated in a pultruding process using one or more strands and/or layers of unidirectional fibres or rovings of unidirectional fibres arranged along a longitudinal direction of the profile and a tool for moulding of the fibres, wherein one or more additional fibres or rovings of additional fibres are introduced in the pultruding process prior to the moulding, wherein the additional fibres are arranged under an angle to the unidirectional fibres, and/or wherein one or more surficial fibres or rovings of surficial fibres are introduced in the pultruding process after the moulding, wherein the surficial fibres are arranged on the outer surface of the moulded profile.