Provided is a method for installing components of a wind turbine, with a lifting device for lifting the respective component hanging at the lifting device via at least one cable, whereby at least one stabilization device is stabilizing the component against vibrations induced by external forces by a gyroscopic effect.

A rotor blade clamping tool includes a first and a second clamping element connected by by a clamping mechanism and each including a first and a second balancing lever being arranged pivotally about a pivot axis and having a first end flexibly connected with a corresponding first rotor blade contacting surface and a second end flexibly connected with a corresponding second rotor blade contacting surface. At least one clamping element includes a main balancing lever arranged pivotally about a main pivot axis and having a first end on which the corresponding first balancing lever is arranged pivotally and a second end on which the corresponding second balancing lever is arranged pivotally. First and second balancing levers arranged on the same main balancing lever are aligned in their longitudinal direction.

Thus there is provided a method of installing rotor blades of a wind turbine to a rotor hub of the wind turbine. The wind turbine has a tower having a tower longitudinal axis. The rotor hub has a first, a second and a third rotor blade connection. The rotor hub is rotated until the first rotor blade connection is at an angle of 90° or 270° with respect to the tower longitudinal axis. The first rotor blade is lifted substantially horizontally and fixed to the rotor blade connection. The rotor hub is rotated so that the second rotor blade connection is at an angle of 90° or 270° with respect to the tower longitudinal axis. The second rotor blade is lifted substantially horizontally and fixed to the second rotor blade connection. The rotor hub is further rotated until the third rotor blade connection is at an angle of 60° or 300° with respect to the tower longitudinal axis. The third rotor blade is lifted at an angle of α=30° with respect to a horizontal and fixed to the third rotor blade connection.

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.

Described is a device for placing a component of a wind turbine on a wind turbine tower. The device includes a hoisting means with a hoisting cable for taking up the component. A positioning tool is connected to the hoisting cable by means of an intermediately arranged intermediate construction which forms part of the positioning tool. A guide frame of the positioning tool is connected on one side to the intermediate construction and is provided on another side with engaging means for engaging a peripheral part of the wind turbine tower. The invention likewise relates to a method which makes use of the invented device.

A system for lifting a wind turbine rotor blade, including a wind turbine rotor blade, a lifting device having a sling, the sling supporting the wind turbine rotor blade at a longitudinal position where the wind turbine rotor blade has an aerodynamic profile, a leading edge and a profile chord arranged horizontally, and a leading edge protector having a front portion placed at the leading edge and a lower leg extending from the front portion and placed below the wind turbine rotor blade, wherein the front portion and the lower leg are formed as a sandwich construction having an inner top layer, an outer top layer and a core material, wherein a thickness of the core material increases from a free end of the lower leg towards the front portion in order to reduce a deformation of the wind turbine rotor blade at the leading edge.

An extension yoke (1), a self-hoisting wind turbine crane (5) with such a yoke a method of using such a yoke are disclosed. The yoke comprises a frame structure comprising a lifting portion (2) and a load transfer portion (3), forming an obtuse angle with each other, and at least one crane attachment element (4) positioned between the load transfer portion and the lifting portion, said at least one crane attachment element being configured for establishing a pivot connection to a crane. The lifting portion comprised a load attachment element (2) and the load transfer portion comprise at least one load transfer element (33), said load transfer element being configured for transferring compressive force by pressing against a reception surface (52) of the crane and for moving in relation to the reception surface. The frame structure may comprise at least two substantially parallel longitudinal beams (12a, 12b), at least one cross-beam (13), and/or at least one stabilisation element (12), and the crane attachment element may comprise a pulley block reception element.

A wind turbine (1) comprising: a tower (2), a nacelle (3) mounted on top of the tower (2), a lift landing platform (7) mounted inside the tower (2), a lift (8) configured to lift cargo (9) to the lift landing platform (7), a hoisting device (13) mounted to the nacelle (3) and configured to hoist cargo (9) lifted to the lift landing platform (7) into the nacelle (3), and guiding means (14) configured to limit a lateral movement (L) of the cargo (9) when hoisted. Damage to the wind turbine or the cargo itself can thus be avoided.

A lifting device for a wind turbine component includes a yoke for connecting the wind turbine component to a crane, the yoke including at least one sensor for measuring the position and/or the speed and/or the acceleration of the wind turbine component at least during a lifting operation of the component is provided. The yoke further includes a pitching device for rotating the wind turbine component around a pitching axis when the wind turbine component is connected to the yoke. The lifting device further includes a controller for controlling the rotation of the pitching device around the pitching axis as a function of the measurement of the at least one sensor.

A crane system for moving a burden, such as a wind turbine component, between the nacelle or rotor of a wind turbine and a location at a lower end of the wind turbine at a distance from the wind turbine, wherein the crane system includes a crane, said crane being adapted to be mounted near or in the nacelle of the wind turbine, wherein said crane includes a boom and wherein the crane has at least one rotational axis, about which sections of the crane can rotate. The disclosure further relates to a method for moving a burden, such as a wind turbine component, between the nacelle or rotor of a wind turbine and a location at a lower end of the wind turbine at a distance from the wind turbine.