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A member for potential equalising in a wind turbine blade between a first conducting member, such as a member comprising carbon fibres, and a second conducting member, such as a lightning conductor is provided. Furthermore, methods for manufacturing of such members for potential equalising are prov

A member for potential equalising in a wind turbine blade between a first conducting member, such as a member comprising carbon fibres, and a second conducting member, such as a lightning conductor is provided. Furthermore, methods for manufacturing of such members for potential equalising are provided. The member for potential equalising comprises a first contact part suitable for connection to a conducting member comprising carbon fibres, a second contact part and an electrical conductor between the contact parts and the first contact part, wherein the first contact part is shaped substantially as a ribbon.

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The invention claimed is: 1. A member for potential equalizing between a first conducting member and a second conducting member of a wind turbine blade, said member for potential equalizing comprising: an electrical conductor, a first contact part for providing a potential equalizing connection bet

The invention claimed is: 1. A member for potential equalizing between a first conducting member and a second conducting member of a wind turbine blade, said member for potential equalizing comprising: an electrical conductor, a first contact part for providing a potential equalizing connection between said first conducting member of said wind turbine blade and said electrical conductor, and a second contact part for providing a potential equalizing connection between said second conducting member of said wind turbine blade and said electrical conductor, wherein said first contact part is shaped substantially as a ribbon and said first conducting member comprises carbon fibres. 2. A member for potential equalizing according to claim 1, wherein said first contact part comprises a conducting metal ribbon. 3. A member for potential equalizing according to claim 2, wherein said conducting metal ribbon has a width of more than 1 cm. 4. A member for potential equalizing according to claim 2 wherein said first contact part further comprises a contact-enhancing layer connected to a side of said conducting metal ribbon to be oriented towards said first conducting member. 5. A member for potential equalizing according to claim 4, wherein said contact-enhancing layer extends beyond the conducting metal ribbon in at least one direction in the plane of the conducting metal ribbon. 6. A member for potential equalizing according to claim 2, wherein said first contact part further comprises a cover layer connected to the-a_side of said conducting metal ribbon to be oriented away from said first conducting member. 7. A member for potential equalizing according to claim 6, wherein said cover layer extends beyond the conducting metal ribbon in at least one direction in the plane of the conducting metal ribbon. 8. A member for potential equalizing according to claim 4, further having, on a side of said conducting metal ribbon opposite to said contact-enhancing layer, a cover layer, wherein said contact-enhancing layer and said cover layer extend beyond the conducting metal ribbon in at least two directions in the plane of the conducting metal ribbon and said contact-enhancing layer extends beyond said cover layer in at least two directions in the plane of the conducting metal. 9. A member for potential equalizing according to claim 4, wherein said contact-enhancing layer is a flexible and conductive material, which comprises a loose non-woven material. 10. A member for potential equalizing according to claim 4, further having, on a side of said conducting metal ribbon opposite to said contact-enhancing layer, a cover layer; and wherein one of said cover layer or said contact-enhancing layer is at least partially impregnated with a resin. 11. A member for potential equalizing according to claim 1, wherein said second contact part comprises a clamp for connecting to a lightning conductor. 12. A member for potential equalizing according to claim 1, wherein said second contact part is substantially equivalent to said first contact part. 13. A member for potential equalizing according to claim 1, wherein said electrical conductor is a conducting metal ribbon. 14. A member for potential equalizing according to claim 13, wherein said first contact part is a conducting metal ribbon which is one of a part of an extension of said conducting metal ribbon of said electrical conductor. 15. A member for potential equalizing according to claim 2, wherein said conducting metal ribbon and said electrical conductor are good conductors and relatively inert. 16. A member for potential equalizing according to claim 4, further having, on a side of said conducting metal ribbon opposite to said contact-enhancing layer, a cover layer: and wherein at least one of said cover layer or contact-enhancing layer is a good conductor and relatively inert. 17. A member for potential equalizing according to claim 15: wherein said first contact part further comprises a contact-enhancing layer connected to a side of said conducting metal ribbon to be oriented towards said first conducting member and a cover layer connected to a side of said conducting metal ribbon to be oriented away from said first conducting member, and wherein at least one of said conducting metal ribbon, cover layer, said contact-enhancing layer and said electrical conductor comprises a combination of materials. 18. A member for potential equalizing according to claim 17, wherein said combination of materials is inhomogeneous, and is selected from one of: a layered structure, selected from one of silver-coated tin or silver-coated copper, a structure with particulate integrated material, selected from one of a metal with a filler, polymer with carbon black, or metal particles, or a structure comprising fibres, selected from one of glass fibres, aramid fibres or carbon fibres. 19. A member for potential equalizing according to claim 1 further comprising at least one further contact part for providing a potential equalizing connection between one or more further conducting members of said wind turbine blade and said electrical conductor. 20. A member for potential equalizing according to claim 1, wherein said first contact part is adapted to provide a potential equalizing connection to said first conducting member, and wherein said first conducting member comprises fibres selected from one of reinforcement fibres in a carbon-fibre or glass-fibre reinforced plastic. 21. A member for potential equalizing according to claim 1, wherein said conducting metal ribbon is oriented substantially orthogonal to at least some of the carbon fibres of said first conducting member. 22. A wind turbine blade comprising a member for potential equalizing according to claim 1, wherein said first conducting member is connected to said first contact part of said member for potential equalizing, and a second conducting member connected to said second contact part of said member for potential equalizing. 23. A wind turbine blade comprising as claimed in claim 22, and further including a number of said members for potential equalizing which are positioned at one of regular or irregular intervals along a length of said wind turbine blade. 24. A method for manufacturing of a member for potential equalizing according to claim 1, comprising the steps of: providing a contact-enhancing layer at or near said first contact part, providing a conducting metal ribbon at least in said first contact part, providing the electrical conductor, providing a second contact part. 25. A method for manufacturing of a member for potential equalizing according to claim 1, comprising the steps of: providing said first conducting member to be potential-equalized, providing a contact-enhancing layer at least partially in contact with said first conducting member, providing a conducting metal ribbon in contact with at least a part of one of said first conducting member andlor said optional-contact-enhancing layer, providing said electrical conductor, and providing a second contact part. 26. A method for manufacturing according to claim 24, wherein said conducting metal ribbon and said electrical conductor are integrated. 27. A method for manufacturing of a member for potential equalizing according to claim 1, comprising the steps of: providing a contact-enhancing layer at or near said first contact part, providing a conducting metal ribbon at least in said first contact part, providing the electrical conductor, providing a cover layer at or near said first contact part, and providing a second contact part. 28. A method for manufacturing according to claim 27 further comprising the step of: providing one of a resin or an adhesive in contact with one of said contact-enhancing layer, said conducting metal ribbon, or said cover layer. 29. A method for manufacturing according to claim 24, further comprising the step of: pre-consolidating said member for potential equalizing. 30. A method for manufacturing according to claim 24, further comprising the step of: curing said member for potential equalizing, wherein said member for potential equalizing and at least a part of said wind turbine are cured together. 31. A member for potential equalizing according to claim 2, wherein said conducting metal ribbon is one of a flexible sheet or a flexible mesh. 32. A member for potential equalizing according to claim 15, wherein one of said conducting metal ribbon or said electrical conductor comprises a metal selected from the group consisting of copper, steel, stainless steel, aluminum, nickel, chromium, tin and silver. 33. A member for potential equalizing according to claim 15, wherein one of said conducting metal ribbon or said electrical conductor comprises copper. 34. A member for potential equalizing according to claim 16, wherein one of said cover layer or said contact-enhancing layer comprises a metal selected from the group consisting of copper, steel, stainless steel, aluminum, nickel, chromium, tin and silver. 35. A member for potential equalizing according to claim 16, wherein one of said cover layer or said contact-enhancing layer comprises stainless steel. 36. A member for potential equalizing according to claim 20, wherein a significant part of the conductance of said first conducting member is provided for by a carbon fibre component of said first conducting member. 37. A member for potential equalizing according to claim 21, wherein said conducting metal ribbon is oriented substantially orthogonal to the main orientation of the carbon fibres of said first conducting member. 38. A method for manufacturing according to claim 27 wherein at least one of said contact-enhancing layer and said cover layer is one of a prepreg, a semi-preg or a dry loose non-woven material. 39. A method for manufacturing of a member for potential equalizing according to claim 1, comprising the steps of: providing said first conducting member to be potential-equalized, providing a contact-enhancing layer at least partially in contact with said first conducting member, providing a conducting metal ribbon in contact with at least a part of one of said first conducting member or said contact-enhancing layer, providing said electrical conductor, providing a cover layer in contact with said conducting metal ribbon, and providing a second contact part. 40. A method for manufacturing according to claim 27, further comprising the step of: curing said member for potential equalizing by a co-curing process wherein said member for potential equalizing and at least a part of said wind turbine are cured together. 41. A method for manufacturing of a wind turbine blade having a member for potential equalizing according to claim 22, the method comprising the steps of: providing said first conducting member connected to said first contact part of said member for potential equalizing, and providing said second conducting member connected to said second contact part of said member for potential equalizing.