A wind turbine is provided including a nacelle and a plurality of electrical and/or mechanical components for the generation and/or the conversion of energy, wherein the nacelle includes a housing structure enclosing an inner volume, in which the components are arranged, wherein the nacelle includes at least one movable extension structure, which may be moved between a retracted position and an extended position, wherein the inner volume enclosed by the housing structure is increased in the extended position.

A rotor blade for a rotor of a wind power installation, to a rotor for a wind power installation, to a wind power installation having a rotor blade and/or having a rotor, and to a method for connection of a rotor blade at a hub of a rotor of a wind power installation. The rotor blade comprises a hub-side end for fastening the rotor blade to a movable part of a blade bearing, wherein a bearing cover is arranged on an outer circumferential surface of the hub-side end of the rotor blade, wherein a portion of the bearing cover that is close to the bearing is further away from the outer circumferential surface of the hub-side end of the rotor blade than a portion of the bearing cover that is remote from the bearing by a multiple.

A gearbox repair assembly is disclosed herein. The gearbox repair assembly includes a sleeve having an inner diameter configured to receive a bearing assembly and an outer diameter configured to fit within a bore of a gearbox housing. The gearbox housing can be part of a gearbox of a wind turbine. The gearbox repair assembly further includes a retaining plate configured to be attached to the gearbox housing for preventing an outer race of the bearing assembly from rotating in the bore relative to the gearbox housing. Also provided are methods to repair such a gearbox. The gearbox repair assembly and related methods reduce the time and cost needed to repair the gearboxes.

The invention is directed to embodiments of wind turbine arrangements. One wind turbine arrangement includes an inflatable component disposed within a hollow section of a wind turbine blade, wherein the inflatable component is a platform usable during service and/or installation of a wind turbine module, wherein the inflatable component includes an inflation structure with an air tight shell, wherein the air tight shell includes an inner shell and an outer shell surrounding the inner shell, and wherein the outer shell includes a material that protects against puncture of the inner shell. Another wind turbine arrangement includes a wind turbine blade; an inflatable platform positioned in the wind turbine blade; and an inflatable outer pressure ring that surrounds the platform, wherein the outer pressure ring, when inflated, fixes the platform in the wind turbine blade by generating a normal friction force between the platform and the wind turbine blade.

Providing is a heating arrangement for bonding a protective shell to a wind turbine blade, including a heating blanket with a first portion and a second portion of a heatable structure, wherein the first portion and the second portion adjoin at a fold of the heating blanket, wherein the fold is curved equally or substantially equally to a curvature of an edge of the wind turbine blade or of a segment of an edge of the wind turbine blade, wherein the heating blanket is mountable to a surface of the wind turbine blade in such manner that the fold abuts the edge or the segment of the edge and that the first portion and the second portion each abuts the surface of the wind turbine blade.

A method for repairing a wind turbine tower foundation, wherein the method comprises steps of providing a hardening liquid comprising functionalized graphene, wherein the hardening liquid has density above water or salt water; introducing the hardening liquid to the wind turbine tower foundation, thereby displacing the water or salt water due to higher density of the hardening liquid; hardening the hardening liquid by resistive heating.

A lightning protection system of a wind turbine is provided, including a blade lightning conductor arranged in a rotor blade of the wind turbine to extend into the hub, a stationary conductor to provide a blade grounding path to ground during a lighting strike, a brush arranged to electrically connect the blade lightning conductor and the stationary conductor, and a discharge means arranged to provide a separate discharge path from the blade lightning conductor to ground. Furthermore, a wind turbine, and a method of equipping a wind turbine with a lightning protection system, is also provided.

Embodiments of the present disclosure include a retrofit auxiliary nacelle yaw position control system that enables advanced nacelle yaw position control of a wind turbine by comparing a desired nacelle yaw position signal with the actual nacelle yaw position and generating a virtual relative wind direction signal that is provided to the existing turbine control unit. This method and system enable implementation of wake steering, collective yaw optimization and dynamic yaw optimization of a collection of wind turbines referred to as a wind plant. Modification of the existing turbine control unit is not required, greatly simplifying the implementation process of advanced yaw control strategies on existing wind plants.

A method of installing a cable in an elongated structure, wherein the cable includes one or more lines is disclosed. The method includes a) enclosing the one or more lines of the cable using a sheath, b) coupling one end of the sheath to a flexible layer, c) disposing the flexible layer at a defined location at an inner surface of elongated structure, d) creating an access path extending from an outer surface of the elongated structure, opposite to the defined location, and e) extracting at least one of the flexible layer, the one or more lines, and the sheath from inside the elongate structure via the access path. Further, a system for installation of a cable in an elongated structure is also disclosed.

A wind turbine blade includes: a blade body; and a leading edge protector covering a leading edge portion of the blade body. The leading edge protector includes: a body layer; and a coating layer having higher hardness than the body layer and at least partially covering a surface of the body layer.