Abstract: The device includes an image capturing element for acquiring at least one image of at least one portion of a wind turbine blade. The image capturing element is configured for being triggered to acquire said image according to parameters related to the wind turbine blade such as blade azimuth and blade pitch at a given time. Acquired images are compared with predetermined reference images having such parameters associated therewith. Other parameters such as blade surface temperature or wind speed may be used. The image capturing element-may include a CCD device mounted on an upper portion of a wind turbine nacelle. An alarm signal can be sent to warn an operator for any abnormalities on the wind turbine blade surface.

Abstract: A tower section for a wind turbine tower structure comprises at least two shell segments defining, in an assembled condition, a substantially hollow structure, and including first connecting means for mutually joining two adjacent shell segments along a joint, which comprise a column of concrete arranged overlapping at least part of the joint between adjacent shell segments. A method for building a tower section for a wind turbine tower structure and a wind turbine comprising a nacelle having rotatable blades and a vertical tower made of at least one of such tower sections are further provided.

Abstract: A tower section for a wind turbine tower structure comprises at least two shell segments defining, in an assembled condition, a substantially hollow structure, and including first connecting means for mutually joining two adjacent shell segments along a joint, which comprise a column of concrete arranged overlapping at least part of the joint between adjacent shell segments. A method for building a tower section for a wind turbine tower structure and a wind turbine comprising a nacelle having rotatable blades and a vertical tower made of at least one of such tower sections are further provided.

Abstract: A joining device (8) for hybrid wind turbine towers (5) intended for the fixation of a metal portion (6) of a wind turbine tower (5) to a concrete portion (7) of said wind turbine (1) which comprises a metal body (9) having a generally tubular configuration that is suitable to be fixed to the metal portion (6) of the tower (5) which in use is adjacent to the concrete portion (7), and suitable for being at least partially embedded into said concrete portion (7), said metal body (9) being provided with a number of anchoring openings (11) adapted such that the material of the concrete portion (7) passes therethrough. A hybrid wind turbine tower (5) comprises such a joining device (8) provided between one metal portion (6) and one concrete portion (7).

Abstract: A joining device (8) for hybrid wind turbine towers (5) intended for the fixation of a metal portion (6) of a wind turbine tower (5) to a concrete portion (7) of said wind turbine (1) which comprises a metal body (9) having a generally tubular configuration that is suitable to be fixed to the metal portion (6) of the tower (5) which in use is adjacent to the concrete portion (7), and suitable for being at least partially embedded into said concrete portion (7), said metal body (9) being provided with a number of anchoring openings (11) adapted such that the material of the concrete portion (7) passes therethrough. A hybrid wind turbine tower (5) comprises such a joining device (8) provided between one metal portion (6) and one concrete portion (7).