Wind turbine blade and wind turbine

Abstract

The invention relates to a wind turbine blade and a wind turbine. A wind turbine blade (5) for a wind turbine (1), the wind turbine blade (5) comprising an electrical conductor (22) extending in a longitudinal direction (L) of the wind turbine blade (5) and a carbon fiber material (25, 39, 40), the carbon fiber material being electrically conductive and having: a first portion (27) arranged next to the electrical conductor (22); a second portion (28) connected to the first portion (27) and attached and electrically connected to the electrical conductor (22); and a third portion (29) connected to the second portion (28) and at least partially overlapping the first portion (27). As a result of this electrical connection between the electrical conductor (22) and the carbon fiber material (25, 39, 40), it is possible to avoid arc formation when conducting the current of the lightning strike, and thus to avoid delamination of carbon.

Description

Technical Field

[0001] The present invention relates to a wind turbine blade for a wind turbine and a wind turbine comprising such a wind turbine blade. Background Art

[0002] The rotor blades of modern wind turbines are constructed of fiber reinforced plastic. The rotor blades usually include an airfoil with a rounded leading edge and a sharp trailing edge. The rotor blades are connected to the hub of the wind turbine with their blade roots. In addition, the rotor blades are connected to the hub by means of pitch bearings, which allow the pitching movement of the rotor blades. Long rotor blades are subject to high wind forces.

[0003] The rotor blade may be made of two half shells connected to each other. Furthermore, a web, in particular a shear web, may be arranged between the two half shells to strengthen the rotor blade. The shear web may be arranged between two beams or spar caps and may be connected to the beams or spar caps. The shear web, beams and / or spar caps may extend in the longitudinal direction of the wind turbine blade and may comprise carbon.

[0004] The rotor blades are the most exposed part of the wind turbine with respect to lightning strikes. Therefore, a lightning protection system (LPS) may be provided. The lightning protection system may include an electrical down conductor, which may be connected to the web and may extend in the longitudinal direction of the web. The down conductor may be electrically connected to the grounding system of the wind turbine blade. In addition, attachment points for lightning, usually referred to as receivers, may be arranged along the blade surface and electrically connected to the down conductor. When a lightning strike is intercepted by the receiver, the current is transmitted to the ground by means of the down conductor.

[0005] A further electrical conductor may be arranged next to the beam, which electrical conductor extends in particular in the longitudinal direction of the wind turbine blade and is electrically connected to the down conductor. In order to prevent damage to the beam, an electrical connection between the electrical conductor and the beam may be provided. However, arcing may occur when a lightning strike is conducted through the beam. This may lead to delamination at the beam or other carbon elements.

[0006] EP 2 930 355 A1 shows a wind turbine blade having a carbon beam, an electrical conductor and a copper mesh which electrically connects the electrical conductor to the carbon beam. Summary of the invention

[0007] It is an object of the present invention to provide an improved wind turbine blade.

[0008] Therefore, a wind turbine blade for a wind turbine is provided. The wind turbine blade comprises an electrical conductor extending in a longitudinal direction of the wind turbine blade and a carbon fiber material, the carbon fiber material being electrically conductive and having: a first portion arranged beside the electrical conductor; a second portion connected to the first portion and attached and electrically connected to the electrical conductor; and a third portion connected to the second portion and at least partially overlapping the first portion.

[0009] The inventors have found that such an electrical connection between the electrical conductor and the carbon fiber material avoids arc formation when conducting a current of, for example, 86 kA, and thus avoids delamination of the carbon. Thus, damage to the wind turbine blade can be avoided when a lightning strike is intercepted by the wind turbine blade.

[0010] In particular, all parts of the carbon fiber material (first, second, third and / or fourth part) are formed as a single piece, i.e. are formed integrally. Carbon fiber material means a composite material comprising carbon fiber and resin. Preferably, the carbon fiber material comprises a mat containing unidirectional carbon fibers. For example, the carbon fiber material is arranged in a trapezoidal shape before folding. In particular, the third part is not attached to the electrical conductor. Preferably, the third part is at least partially attached to the first part. In particular, the first part is rhombus-shaped. The carbon fiber material preferably has a constant material thickness, which is preferably at most 1 / 5, 1 / 10 or 1 / 20 of the width and / or length of the carbon fiber material.

[0011] According to an embodiment, the wind turbine blade further comprises a carbon element extending in the longitudinal direction of the wind turbine blade, the carbon element being arranged beside the electrical conductor and being electrically conductive, wherein the carbon fiber material comprises a fourth portion attached to the carbon element.

[0012] This has the advantage that a carbon to carbon connection is provided to avoid arc formation and delamination of the carbon. In contrast, when a metal mesh is used instead of a carbon fiber material, the current will be transferred mainly at the edges of the connection between the metal mesh and the carbon element. This results in high current density and consequent arcing, so that damage at the carbon element may occur when current is transferred due to a lightning strike.

[0013] The electrical conductor and the carbon element extend in a longitudinal direction of the wind turbine blade, wherein the electrical conductor and the carbon element may be arranged at an angle or in parallel.

[0014] Preferably, the fourth portion is rhombus-shaped. Preferably, the fourth portion is directly connected to the carbon element. For example, the fourth portion and the carbon element are cast together as part of a VARMT (vacuum assisted resin transfer molding) process. In particular, the carbon element is an electrically conductive carbon fiber reinforced beam (a composite material comprising carbon fibers and resin). In particular, the electrical connection between the carbon element and the electrical conductor is not provided with copper or copper mesh, in particular without metal. Preferably, the carbon element has a length of at least 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90% of the length of the wind turbine blade and is, for example, a support structure of the wind turbine blade, the support structure being configured to prevent kinking or buckling of the wind turbine blade. The length of the wind turbine blade may be between 15 and 90 m, between 30 m and 60 m or between 40 m and 55 m.

[0015] Preferably, the fiber ends of the carbon fibers of the carbon fiber material do not terminate at the first portion or the second portion and are arranged at the third portion. For example, one end of the carbon fiber is arranged at the third portion, and the other end of the carbon fiber is arranged at the fourth portion. Therefore, the carbon fiber material includes carbon fibers extending from the third portion toward the fourth portion.

[0016] According to a further embodiment, the second portion at least partially surrounds the electrical conductor.

[0017] This has the advantage that a sufficient attachment surface between the carbon fiber material and the electrical conductor can be provided. Also for this reason, arc formation and damage can be avoided. Preferably, the carbon fiber material is folded around the electrical conductor. In particular, the second portion surrounds the electrical conductor in a U-shaped manner, in particular only in a U-shaped manner.

[0018] According to another embodiment, the third portion includes one portion overlapping with the first portion and another portion not overlapping with the first portion.

[0019] The inventors have found that this also reduces arcing when conducting current.For example, non-overlapping means that the further portion is displaced from the first portion.

[0020] According to a further embodiment, the further portion has a width of at least 5 mm, in particular between 10 mm and 100 mm.

[0021] Preferably, the further portion is strip-shaped having a length which is at least five times, ten times or twenty times the width of the further portion.

[0022] According to another embodiment, the one portion is triangular.

[0023] This has the advantage that, for example, a sufficient attachment surface between the first part and the third part may be provided.

[0024] According to another embodiment, said one part is attached to said first part.

[0025] Thus, the connection between the electrical conductor and the carbon fiber material can be produced simply by, for example, folding the carbon fiber material once around the electrical conductor and attaching the one part to the first part. Preferably, the one part and the first part are cast together as part of a VARMT process.

[0026] According to another embodiment, the distance between the carbon element and the electrical conductor is between 10 mm and 3000 mm or greater than 150 mm, 200 mm or 300 mm.

[0027] This has the advantage that flashover between the electrical conductor and the carbon element can be prevented. In addition, the electrical conductor is also decoupled from the large strains that may occur in the carbon element.

[0028] According to another embodiment, the carbon element comprises a side edge, wherein the fourth portion comprises an end face, and wherein a distance between the side edge and the end face is between 5 mm and 10 mm.

[0029] This has the advantage that a large attachment surface between the fourth part and the carbon element can be provided. The inventors have found that this configuration also reduces arc formation and flashover between the carbon element and the carbon fiber material. Preferably, the fourth part does not cover the side edge of the carbon element. Alternatively, the fourth part covers the side edge of the carbon element and extends beyond the side edge, in particular beyond 5 mm to 10 mm.

[0030] Preferably, a side edge of the carbon element faces away from the electrical conductor. In particular, the side edge is the outermost edge of the carbon element. Preferably, the fourth portion overlaps the carbon element over at least 60%, 70%, 80%, 90%, 95% or 100% of the width of the carbon element.

[0031] According to another embodiment, the width of the carbon fiber material is between 20 mm and 500 mm.

[0032] This has the advantage that sufficient current can be transferred via the carbon fiber material and the corresponding electrical connections and thus damage to the carbon fiber material and the carbon elements can be prevented when a lightning strike hits the wind turbine blade.

[0033] According to another embodiment, the carbon element comprises a first main extension direction and the carbon fiber material comprises a second main extension direction, wherein the angle between the first main extension direction and the second main extension direction is between 0 and 90°, between 30° and 60°, or between 40° and 50°, in particular 45°.

[0034] In particular, the angle is the angle between the carbon fibers of the carbon fiber material and the first main extension direction. For example, the angle is an acute angle. Preferably, the angle is selected based on the conductivity anisotropy of the carbon element and the carbon fiber material, in particular taking into account the orientation of the carbon fibers of the carbon element and the carbon fiber material and / or the orientation of the glass or carbon fibers of the blade shell.

[0035] According to another embodiment, the wind turbine blade further comprises at least or exactly two or three carbon fiber materials, which are attached and electrically connected to the electrical conductor, wherein a distance between two of the at least or exactly two or three carbon fiber materials is preferably less than 500 mm, less than 400 mm, less than 300 mm or 200 mm.

[0036] This has the advantage that redundant electrical connections between the electrical conductor and the carbon element are provided and the current is distributed in such a way that a lower current density is achieved for each carbon fiber material. Thus, arcs and flashovers can be further prevented. Preferably, the carbon fiber materials are arranged identically and are identically connected to the electrical conductor and the carbon element. In particular, exactly two, three or four carbon fiber materials may be arranged side by side.

[0037] According to another embodiment, the distance between the first end of the electrical conductor and the nearest one of the at least or exactly two or three carbon fiber materials is between 100 mm and 500 mm or is at least 10 mm.

[0038] This has the advantage that field concentrations and arc formation can be avoided. It ensures that the current is distributed so that local delamination remains below structural tolerances.

[0039] According to a further embodiment, the electrical conductor is a metal cable.

[0040] The electrical conductor is preferably a braided cable or a metal strip. In particular, the electrical conductor comprises aluminum, copper, steel and / or titanium. Preferably, the electrical conductor has a rectangular cross section and / or a flat cross section.

[0041] Furthermore, a wind turbine comprising such a wind turbine blade is provided.

[0042] A wind turbine currently refers to a device that converts the kinetic energy of wind into rotational energy, which can again be converted into electrical energy by the device.

[0043] Preferably, the wind turbine comprises three or four such wind turbine blades.

[0044] Other possible implementations or alternatives of the present invention also include combinations of features described above or below with respect to the embodiments not explicitly mentioned herein. Those skilled in the art may also add individual or isolated aspects and features to the most basic form of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Other embodiments, features and advantages of the present invention will become apparent from the following description and the dependent claims in conjunction with the accompanying drawings, in which: Figure 1 shows a perspective view of a wind turbine according to one embodiment; Figure 2 Shown according to Figure 1 a perspective view of a wind turbine blade of a wind turbine; Figure 3 Schematically shows Figure 2 sectional view III-III; and Figure 4 Schematically shows the Figure 2 Top view of the electrical connection arrangement of a wind turbine blade.

[0046] In the drawings, like reference numbers indicate identical or functionally equivalent elements unless otherwise indicated. DETAILED DESCRIPTION

[0047] Figure 1 A wind turbine 1 is shown. The wind turbine 1 comprises a rotor 2, which is connected to a generator (not shown) arranged within a nacelle 3. The nacelle 3 is arranged at an upper end of a tower 4 of the wind turbine 1.

[0048] The rotor 2 comprises three wind turbine blades 5. The wind turbine blades 5 are connected to a hub 6 of the wind turbine 1. A rotor 2 of this type may have a diameter ranging, for example, from 30 to 200 meters or even larger. The wind turbine blades 5 are subject to high wind loads. At the same time, the wind turbine blades 5 need to be lightweight. For these reasons, the wind turbine blades 5 in modern wind turbines 1 are made of fiber reinforced composite materials. Glass fibers or carbon fibers in the form of unidirectional fiber mats are often used.

[0049] Figure 2A wind turbine blade 5 is shown. The wind turbine blade 5 comprises an aerodynamically designed portion 7, which is shaped for optimally utilizing wind energy, and a blade root 8, which is used to connect the wind turbine blade 5 to a hub 6. Furthermore, the wind turbine blade 5 comprises a blade tip 9, which is arranged averted from the blade root 8. The wind turbine blade 5 extends in a longitudinal direction L. The blade 5 has a length M, which may be, for example, between 15 m and 90 m.

[0050] Figure 3 Schematically shows Figure 2 Sectional view III-III. Figure 3 All elements shown in the figure are shown simplified. It is to be understood that intermediate elements, in particular further connecting elements and reinforcing elements, can be provided.

[0051] The wind turbine blade 5 comprises an outer blade shell 10, which comprises a first half shell 11 and a second half shell 12, which are connected together at one side 13 of the wind turbine blade 5, in particular at the trailing edge, and at the other side 14 of the wind turbine blade 5, in particular at the leading edge, to form the outer shell 10 of the wind turbine blade 5.

[0052] The chord line Z intersects the trailing edge and the leading edge. The blade shell 10 may comprise a composite fiber material. Furthermore, the first half shell 11 and the second half shell 12 may be glued together. Alternatively, the blade shell 10 may also be provided as a one-piece element. The first half shell 11 comprises an inner surface 15 and the second half shell 12 comprises inner surfaces 16 which are opposite to each other, wherein an inner space 17 of the wind turbine blade 5 is defined by said inner surfaces 15, 16.

[0053] A web 18, in particular a shear web, is located in the inner space 17, which extends from the inner surface 15 of the first half shell 11 to the inner surface 16 of the second half shell 12. The wind turbine blade 5 further comprises a carbon element 19, in particular a first carbon beam, connected to the first half shell 11, and a carbon element 20, in particular a second carbon beam, connected to the second half shell 12.

[0054] In particular, the carbon elements 19 , 20 are electrically conductive and extend in the longitudinal direction L. Preferably, the web 18 extends in the longitudinal direction L. As shown in FIG.

[0055] The web 18 is located between the carbon element 19 and the carbon element 20, wherein the web 18 and the carbon elements 19, 20 form an I-shaped cross-section. The web 18 and the carbon elements 19, 20 form a support structure that prevents breaking or crippling of the wind turbine blade 5. Alternatively or additionally, the carbon elements 19, 20 may be arranged close to the trailing edge or leading edge of the wind turbine blade 5.

[0056] Furthermore, a lightning conductor 21 is provided, which extends in the longitudinal direction L and is attached to the web 18. The lightning conductor 21 is arranged between the carbon elements 19, 20. Preferably, the lightning conductor 21 is a down conductor. In particular, the lightning conductor 21 is a metal cable. Furthermore, the lightning conductor 21 is preferably grounded.

[0057] Furthermore, an electrical conductor 22 extending in the longitudinal direction L is arranged in the inner space 17. Preferably, the electrical conductor 22 is connected to the inner surface 15. In particular, a receptor 23 is arranged at the outer surface 24 of the blade 5. The receptor 23 is electrically connected directly or indirectly to the electrical conductor 22 and the lightning conductor 21 (connection not shown).

[0058] A plurality of receptors 23 may be provided at the outer surface 24. The receptors 23 and the conductor 21 form a lightning protection system. In addition, a conductive carbon fiber material 25 is provided. The carbon fiber material 25 is attached and thus directly electrically connected to the electrical conductor 22.

[0059] In particular, the carbon fiber material 25 is a carbon mat comprising unidirectional carbon fibers. Preferably, the electrical conductor 22 is a metal cable. Furthermore, the carbon fiber material 25 is attached and thus directly electrically connected to the carbon element 19, which preferably comprises carbon fibers, in particular unidirectional carbon fibers.

[0060] This has the advantage that the impedances of the carbon element 19 and the carbon fiber material 25 are in the same range and therefore the current is transferred uniformly from the carbon fiber material 25 to the carbon element 19 , ie not mainly at the edges of the connection.

[0061] Preferably, the electrical conductor 22 is attached to the lightning conductor 21 (not shown) and, therefore, is also directly electrically connected to the lightning conductor 21. In particular, a further electrical connection (not shown), in particular a metal cable and / or a standard cable or a further carbon mat, may be provided for electrically connecting the electrical conductor 22 to the lightning conductor 21. The electrical conductor 22, the carbon fiber material 25 and the carbon element 19 form an electrical connection arrangement 26.

[0062] Figure 4 Schematically shows Figure 3 26, wherein a view from above is schematically shown. Preferably, this represents a view perpendicular to the longitudinal direction L and perpendicular to the chord line Z.

[0063] The carbon fiber material 25 includes: a portion 27 (also referred to as a first portion), which is arranged beside the electrical conductor 22; a portion 28 (also referred to as a second portion), which is connected to the portion 27 and is attached and electrically connected to the electrical conductor 22; a portion 29 (also referred to as a third portion), which is connected to the portion 28; and a portion 30 (also referred to as a fourth portion), which is attached and electrically connected to the carbon element 19. The portion 29 at least partially overlaps the portion 27. Preferably, the portions 27, 28, 29, 30 are formed by a single-piece carbon mat.

[0064] The portion 27 is arranged between the electrical conductor 22 and the carbon element 19 and is not in contact with the electrical conductor 22 and the carbon element 19. Furthermore, the portion 27 is rhombus-shaped. The second portion 28 at least partially surrounds the electrical conductor 22 in a U-shaped manner.

[0065] The portion 29 comprises one portion 31 overlapping the portion 27 and another portion 32 not overlapping the portion 27, i.e. the other portion 32 is arranged beside the portion 27 and not in contact with the portion 27. Preferably, the one portion 31 is attached to the portion 27. The one portion 31 is preferably triangular. The other portion 32 is strip-shaped and has a width D of at least 5 mm, in particular between 10 mm and 100 mm.

[0066] like Figure 4 As shown in , the carbon fiber material 25 is folded once and the electrical conductor 22 is accommodated in the fold formed by the portion 28. The carbon element 19 is arranged next to the electrical conductor 22. The distance J between the carbon element 19 and the electrical conductor 22 is between 10 mm and 3000 mm or greater than 150 mm. In particular, the distance J is measured between the side edge 33 of the adjacent portion 27 of the carbon element 19 and the edge 34 of the adjacent portion 27 of the electrical conductor 22. The edges 33 and 34 face each other.

[0067] Furthermore, the carbon element 19 further comprises a side edge 35 facing away from the electrical conductor 22. The portion 30 comprises an end face 36 facing away from the electrical conductor 22. The distance E between the side edge 35 and the end face 36 is between 5 mm and 10 mm or greater than 5 mm. Figure 4 As shown in FIG, the fourth portion 30 does not cover the side edge 35 of the carbon element 19. Alternatively, the fourth portion 30 covers the side edge 35 of the carbon element 19 and extends beyond the side edge 35, in particular beyond 5 mm to 10 mm.

[0068] The portion 30 completely overlaps the carbon element 19. Thus, a sufficient attachment area between the carbon fiber material 25 and the carbon element 19 is provided. This ensures a uniform distribution of the current when conducting a lightning strike. Thus, arc formation between and at the carbon element 19 and the carbon fiber material 25 can be avoided when transferring current, and thus, delamination can be prevented. The portion 30 is preferably rhombus-shaped.

[0069] The carbon fiber material width C measured between the two side edges 37, 38 of the carbon fiber material 25 is between 100-500 mm, in particular 200 mm. The carbon element 19 comprises a main extension direction V (also called first main extension direction), and the carbon fiber material 25 comprises a main extension direction W (also called second main extension direction), wherein the angle α between the main extension direction V and the main extension direction W is between 30° and 60° or 40° and 50°, in particular 45°. Preferably, the angle α is also or alternatively provided between the edge 33 and the side edge 38. The side edges 37, 38 extend parallel to the main extension direction W.

[0070] Furthermore, the three carbon fiber materials 25, 39, 40 are arranged parallel to each other. In particular, the carbon fiber materials 25, 39, 40 are arranged identically and are identically attached to the electrical conductor 22. The carbon fiber material 39 is arranged next to the carbon fiber material 25, wherein the distance B between the carbon fiber materials 25, 39 is less than 500 mm, less than 400 mm, less than 300 mm, or 200 mm. The carbon fiber material 40 is arranged next to the carbon fiber material 39, wherein the distance B is preferably also arranged between the carbon fiber materials 39, 40.

[0071] The distance A between the first end 41 of the electrical conductor 22 and the carbon fiber material 25 closest to the first end 41 is at least 10 mm, preferably between 100 mm and 500 mm. In addition, the electrical conductor 22 also includes an end portion 42, which includes the second end 43 of the electrical conductor 22. Preferably, the end portion 42 has a length I between 200 mm and 300 mm or longer.

[0072] The end portion 42 may be provided as a more flexible portion than the rest 44 of the electrical conductor 22. Preferably, the end portion 42 is a flexible component. In particular, this means that during casting of the prefabricated carbon element 19, in particular the spar cap, the end portion 42 remains dry in order to facilitate contact with the lightning conductor 21 (see FIG. 1 ) during assembly of the blade. Figure 3 The distance H between the closest carbon fiber material 40 and the end portion 42 is preferably between 100 and 500 mm.

[0073] The distance F between the side edge 33 and the side edge 35 is preferably between 100 mm and 1000 mm, between 300 mm and 800 mm, or between 500 mm and 700 mm, in particular exactly 600 mm, which is preferably the width of the carbon element 19 .

[0074] Furthermore, the electrical conductor 22 comprises a width G which is preferably between 10 mm and 200 mm, between 20 mm and 70 mm or between 20 mm and 40 mm, in particular exactly 30 mm. Preferably, the electrical conductor 22 is a cable having a flat shape, i.e. a flat cross section, in order to have a good pressure distribution at the interface with the carbon fiber material 25, 39, 40 during manufacture. Preferably, the electrical conductor 22 has a rectangular cross section (not shown).

[0075] In particular, the carbon element 19 and the electrical conductor 22 are formed by means of exactly two, three or four carbon fiber materials 30, 39, 40 ( Figure 4 The electrical conductor 22 is preferably a metal conductor made of aluminum, copper, steel and / or titanium, such as a braided cable or a metal strip, which contacts the carbon fiber material 25, 39, 40 over a large surface.

[0076] Although the present invention has been described in terms of preferred embodiments, it will be apparent to those skilled in the art that modifications are possible in all embodiments. Figure 3 ) may have a frame-shaped cross-section. In particular, another electrical conductor may be provided at the surface 16, which is connected to the carbon element 20 by means of a carbon fiber material as described above. Additionally or alternatively, several electrical conductors may be provided at the surface 15, which are arranged side by side in the direction L and are connected to the carbon element 19 by means of a carbon fiber material as described above.

Claims

1. A wind turbine blade (5) for a wind turbine (1), the wind turbine blade (5) comprising an electrical conductor (22) extending in a longitudinal direction (L) of the wind turbine blade (5) and a carbon fiber material (25, 39, 40), the carbon fiber material (25, 39, 40) being electrically conductive and having: a first portion (27) arranged beside the electrical conductor (22); a second portion (28) connected to the first portion (27) and attached and electrically connected to the electrical conductor (22); and a third portion (29) connected to the second portion (28) and at least partially overlapping the first portion (27), in, The third portion (29) includes a portion (31) overlapping with the first portion (27) and another portion (32) not overlapping with the first portion (27), wherein said one portion (31) is triangular, wherein the carbon element (19) comprises a first main extension direction (V), and the carbon fiber material (25, 39, 40) comprises a second main extension direction (W), and wherein the angle (α) between the first main extension direction (V) and the second main extension direction (W) is between 0 and 90°, between 30° and 60°, or between 40° and 50°, in particular 45°, The angle (α) between the first main extension direction (V) and the second main extension direction (W) is selected based on the conductivity anisotropy of the carbon element (19) and the carbon fiber material (25, 39, 40).

2. The wind turbine blade according to claim 1, further comprising a carbon element (19) extending in the longitudinal direction (L) of the wind turbine blade (5), the carbon element (19) being arranged beside the electrical conductor (22) and being electrically conductive, wherein The carbon fiber material (25, 39, 40) includes a fourth portion (30) attached to the carbon element (19).

3. The wind turbine blade according to claim 1 or 2, characterized in that The second portion (28) at least partially surrounds the electrical conductor (22).

4. The wind turbine blade according to claim 1, wherein: The other portion (32) has a width (D) of at least 5 mm, in particular between 10 mm and 100 mm.

5. The wind turbine blade according to claim 1, It is characterized in that The one portion (31) is attached to the first portion (27).

6. A wind turbine blade according to any one of claims 2 to 5, It is characterized in that The distance (J) between the carbon element (19) and the electrical conductor (22) is between 10 mm and 3000 mm or greater than 150 mm.

7. A wind turbine blade according to any one of claims 2 to 6, It is characterized in that The carbon element (19) comprises a side edge (35), wherein the fourth portion (30) comprises an end face (36), and wherein a distance (E) between the side edge (35) and the end face (36) is between 5 mm and 10 mm.

8. A wind turbine blade according to any one of claims 1 to 7, It is characterized in that The width (C) of the carbon fiber material (25, 39, 40) is between 20 mm and 500 mm.

9. A wind turbine blade according to any one of claims 1 to 8, further comprising at least or exactly two or three carbon fiber materials (25, 39, 40) attached and electrically connected to the electrical conductor (22), wherein The distance (B) between two carbon fiber materials (25, 39) of the at least or exactly two or three carbon fiber materials (25, 39, 40) is preferably less than 500 mm, less than 400 mm, less than 300 mm, or 200 mm.

10. The wind turbine blade according to claim 9, characterized in that The distance (A) between the first end (41) of the electrical conductor (22) and the nearest one (25) of the at least or exactly two or three carbon fiber materials is between 100 mm and 500 mm or is at least 10 mm.

11. A wind turbine blade according to any one of claims 1 to 10, It is characterized in that The electrical conductor (22) is a metal cable.

12. A wind turbine (1) comprising a wind turbine blade (5) according to any one of claims 1-11.

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