Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
  • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
  • F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
  • F03D—WIND MOTORS
  • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
  • F03D80/80—Arrangement of components within nacelles or towers
  • F03D80/82—Arrangement of components within nacelles or towers of electrical components
  • F03D80/85—Cabling
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/18—Rotary transformers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2240/00—Components
  • F05B2240/90—Mounting on supporting structures or systems
  • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
  • F05B2240/912—Mounting on supporting structures or systems on a stationary structure on a tower
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/70—Wind energy
  • Y02E10/72—Wind turbines with rotation axis in wind direction
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/70—Wind energy
  • Y02E10/728—Onshore wind turbines
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49316—Impeller making
  • Y10T29/4932—Turbomachine making
  • Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member

Definitions

• the present invention is in the field of wind turbines. More in particular, it is in the field of power transfer between a wind turbine nacelle and tower on which the nacelle is mounted revolutely.
• the nacelle of a wind turbine is typically suspended at the top of a tower in horizontal axis systems using a rotating (revolute) mounting.
• the power produced by the generator in the nacelle needs to be transferred to the base of the tower.
• this is usually achieved using a cable connected to the nacelle which passes through a passageway disposed within the tower. Slack in the cable towards the upper part of the tower allows for some degree of cable coiling due to rotation (yawing) of the nacelle that follows any change in wind direction.
• a device counting the number of turns is used to limit the maximum coiling of the cable. Once this maximum has been reached, the turbine is stopped and a yaw mechanism unwinds the cable by rotating the nacelle in the opposite direction of the coiling, thereby restoring the cable to its original unwound condition.
• the system of the art is associated with several disadvantages. Additional cable must be foreseen to allow for the coiling, which adds to the expense of construction.
• the cable is suspended through the aforementioned passageway using a net made of steel cable; as the conducting cable is made from thick copper, and is quite heavy, large forces are applied to the net, often leading to fatigue and failure.
• the system needs a mechanism to count the number of turns that the cable has been coiled; such a mechanism requires maintenance and provides a potential source of failure and expense.
• the system also requires an active yaw mechanism to unwind the cable once the maximum allowed number of turns has been reached; again this mechanism requires maintenance and provides a potential source of failure and expense. Cable damage and eventually short- circuits cause by failure of these systems lead to additional expense.
• a slip ring unit consists of a set of brushes and a set of rings that form rotating contacts. Uniformly distributed pressure for a contact between the brush and the ring is usually assured using springs. This system has numerous disadvantages. Dependent upon the yaw rate and the amount of current transferred, the brushes, usually made out of carbon, wear down regularly and need to be replaced, which contributes to running costs which includes downtime.
• the slip-ring unit needs to be mounted so that the alignment between the brushes and the contact rings is correct, to avoid that the brushes wear unduly; this alignment process requires time and specialist equipment.
• the slip ring assembly generates carbon dust caused by wearing of the brushes; therefore an evaluation system is required to prevent short-circuits caused by the conductive carbon; such a system requires maintenance and provides a potential source of failure and expense.
• Contact-less power transmission is a generally known method used in mechanical and electrical engineering fields with particular use in consumer devices.
• US 7,622,891 Choeng et al., Nov. 24 2010
• a general device is described to inductively power a secondary unit. The device eases manipulation for the user as it is not necessary to place the power-receiving unit in mechanical or other registration with the power-transmitting device.
• US 7,717,619 (Karch et al., May 18 2010) describes contactless data transmission for CT imaging purposes.
• US 2007/0007857 (Cullen et al., Jan 1 1 2007) describes a wind-turbine architecture eliminating the problem of slip-rings and cable wind-up.
• the present invention is a system for contactless, (zero-wear) power transfer from a wind turbine nacelle to a wind turbine tower on which the nacelle is attached.
• the nacelle is preferably a horizontal axis system i.e. the axle of the turbine blades is aligned essentially horizontally.
• the wind turbine tower is preferably longitudinal, and vertically mounted.
• the wind turbine nacelle is attached to a wind turbine tower using a revolute (rotatable or yawing) mounting.
• the tower may be fixed to the ground or to the seabed, or be floating on water.
• the tower is not able to rotate around its longitudinal axis, while the nacelle is able to rotate around the longitudinal axis of the tower in order to track the wind direction and keep the rotor perpendicular to the dominating wind flow.
• the relative motion between the nacelle and the tower is known as the yawing or yaw motion, and is in most cases facilitated by a yaw bearing.
• the power generated by the wind turbine electrical generator thus has to be transmitted from the rotating nacelle that is connected to the fixed tower.
• One aspect provides a transformer comprising a primary winding and secondary winding arranged in concentric alignment.
• the primary winding is configured for attachment to the nacelle;
• the secondary winding is configured for attachment to the turbine tower.
• the secondary winding and the primary winding are also in rotatable (revolute) alignment.
• the primary windings in the tower and the secondary windings in the nacelle align such that they form a transformer.
• Alternating current (AC) provided by the generator housed in the nacelle is transferred wirelessly via the transformer to the tower, without the need for an arrangement of slip- rings or a direct cable connection.
• the operation of the transformer is such that it is independent of the relative (revolute) orientation of the primary and secondary windings.
• the nacelle can thus rotate freely and track the wind direction without having to take into account its rotational position in relation with the tower. On other words, the system permits an infinite number of turns.
• This invention is thus particularly well suited in combination with a free yaw system where there is no active system controlling the yaw motion but rather the aerodynamic forces are used to ensure proper orientation of the nacelle in the wind flow.
• the generator housed in the nacelle may supply alternating current at a fixed-frequency.
• the generator housed in the nacelle may supply alternating current at a variable- frequency.
• the transformer will wireless transfer power to the tower, regardless of the frequency of the alternating current. It will be appreciated that higher alternating current output frequencies allow for a more compact transformer.
• One aspect provides a power converter for transforming the low-frequency alternating current provided by the generator into a higher-frequency current, for instance in the kHz range (e.g. at least 1 kHz, 10kHz, 50 kHz, 100kHz or a value in the range between any two of the aforementioned values) . This would reduce the size and thus the weight of the rotating transformer arrangement thereby reducing costs. Cables connected to the primary winding conduct power generated by the wind tower to an electrical collector network of a wind farm or to a grid, optionally via one or more power converters.
• the invention does not add any unnecessary components to the conversion process of a wind turbine.
• Turbines with rated powers starting at several hundreds of kilowatts are usually connected to the distribution grid and thus use step-up transformers to convert the lower output voltage of the generator to the voltage level of the grid.
• Such modern-day turbines already include a Low-voltage-to-Medium-voltage transformer in the nacelle.
• the invention does not add any or significant weight to the tower-top mass (the total mass of the turbine placed on top of the tower).
• the nacelle may make the nacelle more compact as transformer can now be integrated in the tower top, as opposed to occupying space within the nacelle.
• One aspect of the invention relates to a transformer (100) for the transfer of electrical power from a nacelle (250) of a horizontal-axis wind turbine to a turbine tower (350) of said wind turbine whereby the nacelle (250) is in revolute attachment to the tower (350), comprising:
• windings (200, 300) are in revolute alignment with each other, and configured for transfer of electrical power by induction from the primary winding (200) to the secondary winding (300).
• the primary (200) and secondary (300) windings may be in essentially concentric alignment.
• the primary (200) winding may be outside of the secondary (300) winding.
• the primary winding (200) may comprise an annular inductive coil (210) and an annular magnetically permeable member (220, 222), whereby the annular magnetically permeable member (222) is disposed around the outside of the coil (210).
• the secondary winding (300) may comprise an annular inductive coil (310) and a cylindrical magnetically permeable member (320, 322), whereby the coil (310) is disposed around the outside of the cylindrical magnetically permeable member (322).
• the secondary (300) winding may be outside of the primary (200) winding.
• the transformer (100) may be configured for inductive transfer of high-frequency alternating current.
• a horizontal-axis wind turbine comprising turbine tower (350) and a nacelle (250) in revolute attachment to the tower (350), comprising a transformer (100) describe herein.
• the revolute attachment may comprise a mounting (150) into which the transformer (100) is integrated.
• the mounting (150) may comprise a nacelle part (230) and a tower part (330) that couple together, and the primary (200) winding is integrated into the nacelle part (230) and the secondary (300) winding is integrated into the tower part (330).
• One of said mounting parts (230, 330) may comprise a cylindrical pin, the other of said mounting parts may comprise a cylindrical cavity configured to slidably receive the cylindrical pin.
• Said turbine tower (350) may be at least partially hollow.
• Said nacelle (250) may be dismountably attached to the tower (350).
• Another aspect of the invention relates to a method of assembling a horizontal-axis wind turbine as described herein, comprising the steps:
• Another aspect of the invention relates to a method of assembling a horizontal-axis wind turbine as described herein comprising the step of lifting the nacelle comprising a primary winding (200) from the wind turbine tower comprising the secondary winding (300).
• FIG. 1 is a schematic perspective view of a transformer described herein.
• FIG. 2 is a cross sectional view through a plane parallel and adjacent to the central axis of the transformer. Hatched shading indicates magnetically permeable material while horizontal shading indicates inductive coil.
• FIG. 3 is a cross sectional view through a plane parallel and adjacent to the central axis of the tower. One transformer is shown.
• FIG. 4 is a cross sectional view through a plane parallel and adjacent to the central axis of the tower. Three transformers are shown.
• FIG. 5 is a cross sectional view through a plane parallel and adjacent to the central axis of the tower. Three transformers are shown that are magnetically coupled.
• the terms "one or more” or “at least one”, such as one or more or at least one member(s) of a group of members, is clear per se, by means of further exemplification, the term encompasses inter alia a reference to any one of said members, or to any two or more of said members, such as, e.g., any ⁇ 3, ⁇ 4, ⁇ 5, ⁇ 6 or ⁇ 7 etc. of said members, and up to all said members.
• one aspect of the invention relates to a transformer 100, (rotating transformer), for the transfer of electrical power from a nacelle of a horizontal-axis wind turbine to a turbine tower of said wind turbine, whereby the nacelle is in revolute attachment to the tower, comprising a primary winding 200 adapted for attachment to the nacelle and a secondary winding 300 adapted for attachment to the tower which windings 200, 300 are revolute (rotatable) and optionally in essentially concentric alignment with each other, configured for transfer of electrical power by induction from the primary winding 200 to the secondary winding 300.
• the rotation is about an axis of rotation R-R'.
• One winding is generally static, while the other winding rotates around that axis of rotation. In FIGs.
• the primary winding 200 is on the outside and rotates, while the secondary winding 300 is on the inside and is static relative to the primary winding 200. It will be appreciated that other configurations are possible e.g. the primary winding 200 may be on the inside.
• the primary winding 200, the secondary winding 300 or both windings 200, 300 may incorporate one or more magnetically permeable members (e.g. core) such as iron for guidance of the flux, particularly across an annular air gap between the primary 200 and secondary 300 windings.
• the primary winding 200 comprises a primary winding inductive coil 210 that is electrically connected directly or indirectly to the generator housed in the nacelle.
• the primary winding coil 210 preferably forms an annular (circular) ring, having a central axis.
• the central ( ⁇ - ⁇ ') axis of the coil 210 is essentially co-axial with the axis of rotation of the transformer 100.
• the primary winding 200 may further comprise at least one magnetically permeable member 220, having a cylindrical or annular shape 222 and having a central axis.
• the central axis of the magnetically permeable member 222 is essentially co-axial with the axis of rotation of the transformer.
• the coil 210 and magnetically permeable member 222 are preferable in concentric and optionally co-axial alignment.
• the coil 210 may be made from copper or aluminum formed into wire or foil. It may be form-wound for higher power ratings.
• the primary winding 200 is in fixed relation to the nacelle 250, and thus rotates as the nacelle 250 rotates around the longitudinal axis of the tower 350.
• the secondary winding 300 comprises an inductive coil 310 that is electrically connected to the output of the wind tower located in the wind tower.
• the secondary winding coil 310 preferably forms an annular (circular) ring, having a central axis.
• the central ( ⁇ - ⁇ ') axis of the coil 310 is essentially co-axial with the axis of rotation of the transformer 100.
• the secondary winding 300 may further comprise at least one magnetically permeable member 320, having a cylindrical or annular shape and having a central axis.
• the central axis is essentially co-axial with the axis of rotation of the transformer 100.
• the secondary winding coil 310 and magnetically permeable member 320 are preferable in concentric and optionally co-axial alignment.
• the coil 310 may be made from copper or aluminum formed into wire or foil. It may be form-wound for higher power ratings.
• the secondary winding 300 is in fixed relation to the tower, and thus stationary.
• the primary 200 and secondary 300 windings are preferably in essentially concentric alignment.
• the primary winding 200 (the outer winding) may be disposed around the outside of the secondary winding 300 (the inner winding) as illustrated in FIG. 2.
• the secondary winding 300 (the outer winding) may be disposed around the outside of the primary winding 200 (the inner winding) (not illustrated).
• the arrangement will depend on the configuration of the rotatable mounting used to attach the nacelle 250 to the tower 350.
• the primary winding 200 is integrated into the one part of the mounting and the secondary winding 300 is integrated into the another reciprocating part of the mounting, such that the primary 200 and secondary windings 300 are in concentric (overlapping) alignment when the nacelle 250 is mounted on the tower 300.
• the primary winding 200, the secondary winding 300 or both windings may incorporate an arrangement of one or more of magnetically permeable members 230, 320, made, for instance from iron for conductance of the flux, particularly across an air gap between the primary and secondary winding.
• a magnetically permeable member (sometimes known as a core) is made from magnetically conductive material. It provides a path of minimum resistance to magnetic flux generated by the coil.
• a magnetically permeable member may be made from any high permeability magnetically conductive material.
• a magnetically permeable member may be made from iron.
• a magnetically permeable member is made from non-grain oriented iron to reduce the weigh of the transformer and to reduce the losses.
• other materials such as ferrites or iron powder may be used.
• magnetically permeable members 220, 320 are arranged to give rise to a shell-type transformer.
• the outer winding comprising an annular cylinder of magnetically permeable material 220, 320 that encloses the coil of the outer winding, and the coil is flanked by a pair of end plates of magnetically permeable material.
• the central axis ( ⁇ - ⁇ ') of annular ring of magnetically permeable material is essentially co-axial with the axis of rotation of the transformer. Exemplified in FIG.
• the primary winding 200 is on the outside and comprises an annular cylinder 222 of magnetically permeable material that encloses the coil 210, and the coil 210 is flanked by a pair of end plates 224, 226 of magnetically permeable material.
• the shell-type transformer has the advantage that no coil is apparent outside the permeable members.
• the magnetically permeable material encloses the coil, which provides robustness to short circuit and transportation efforts, and compactness of the design to match transportation and hauling restrictions. It is appreciated that magnetically permeable members may be arranged to give rise to a core-type transformer in the outer winding i.e. the coil of the outer winding is arranged around an annular ring of magnetically permeable material.
• the amount of magnetic flux passing through each of the primary and secondary windings is similar or the same by disposing both windings on the same continuous magnetically permeable member (core).
• the magnetically permeable members 220, 320 are arranged in a discontinuous manner, i.e. there is an air gap between magnetically permeable members (core) of the primary 200 and secondary 300 windings of the transformer in order to allow for relative rotational movement.
• the air gap in between the inner and outer part of the magnetic core is minimised in order to limit the leakage inductance of the transformer.
• the air gap 160 between the primary 200 and secondary 300 windings has an annular cylindrical shape.
• magnetically permeable members 220, 320 are arranged to give rise to a reel shape, around which reel the coil is wound.
• the reel has a cylindrical core 322 that is flanked by a pair of disc-shaped end plates 324, 326.
• the central axis of the reel is essentially co-axial with an axis of the rotation of the transformer.
• the a secondary winding 300 is an inner winding, and which the magnetically permeable members 320 are arranged to give rise to said reel shape, around which reel the coil 310 is wound.
• a cylindrical magnetically permeable member of the inner winding of a transformer may comprise one or more longitudinal grooves on the surface for the passage of conductive wires from transformers located above to grid interconnection at the base of the tower.
• three longitudinal grooves are evenly arranged around the cylindrical surface of the magnetically permeable member. In other words, they are circumferentially distributed at intervals of 120 deg.
• the grooves may be offset in order to have a balance in magnetic forces in all relative positions of the primary and secondary windings and thus no preferred positions. It will be appreciated that the groove arrangement may be achieved using three segments of magnetically permeable material which together form essentially a cylindrical shape.
• the magnetically permeable members can be prolonged to be in contact with the outer surface of the tower in order to have a better cooling and/or to fit with the mechanical support structure.
• the coil 210, 310 of one or both windings may be made from a foil. In other words, from an insulated strip of conductive metal, as opposed from a conventional strand of wire.
• a foil coil can be used with some advantage. For instance, with respect to the inner winding, a foil can be easily wound around magnetically permeable member when it forms the shape of a reel, as shown in FIG. 2.
• a polyester layer is bonded to the foil to provide mechanical strength and for insulation.
• a foil coil can form a ring onto which the segments of annular magnetically permeable member can be fitted.
• the conductive metal may be a flat strip.
• rectangular conducting strips are preferred.
• the nacelle 250 is in revolute attachment to the tower 350 using a rotatable (revolute) mounting 150.
• the mounting is configured for integration of the transformer components, namely these primary and secondary windings.
• the windings may be integrated into the mounting 150 by virtue of a mechanical support structure.
• the mounting preferably comprising a bearing that transfer the weight of the nacelle onto the wind tower while allowing yawing
• the mounting 150 may comprise a nacelle part 230 and a tower part 330, one of said mounting parts comprising a cylindrical pin, the other of said mounting parts comprising a cylindrical cavity configured to slidably receive the cylindrical pin.
• the pin and cylindrical cavity are in slidable relation.
• the nacelle part 320 of the mounting comprises a cylindrical cavity while the tower part 330 comprises the cylindrical pin.
• the nacelle part 320 of the mounting may comprise a cylindrical pin while the tower part 330 may comprise the cylindrical cavity.
• the nacelle 250 is dismountably attached to the tower 350.
• the nacelle part 320 is dismountably attached to the tower part 330 of the mounting.
• a dismountable attachment is configured for reversible attachment (e.g. for ease of attachment and unattachment) of the respective elements.
• the primary winding 200 is integrated into the nacelle part 230 of the mounting 150. Preferably it is integrated so that the outer cylindrical profile is maintained.
• the secondary winding 300 is integrated into the tower part 330 of the mounting 150. Preferably it is integrated so that the outer cylindrical profile is maintained.
• the primary 200 and secondary 300 windings may each be disposed in a housing configured to withstand the bending loads due to the aerodynamic forces and gravity.
• One or more yaw bearings 170, 175 may be provided where the nacelle part 230 and a tower part 330 of the mounting are in mechanical contact, preferably where the weight of the nacelle 250 is supported by the tower 350. Typically they are provided at the longitudinal end of the cylindrical pin (see bearing170) and around the mouth of the cylindrical cavity (see bearing 175). The former bearing may assure the exact spacing between the two parts of the rotating transformer.
• the yaw bearing may be a sliding or rolling bearing.
• a wind turbine may be provided with one or more (e.g. 2, 3, 4 or more) transformers 100.
• FIG. 4 depicts a wind turbine disposed with three separate transformers 100, 100' 100", one for each phase. Also shown is the nacelle 250 and turbine blades 252 and wind tower 350.
• the transformers are arranged in longitudinal displacement along the mounting. Their central axes are preferably essentially co-axial.
• the transformers are preferably spatially separated from each other. Where there are two or more transformers, they may be arranged adjacently i.e. without air gaps in the longitudinal direction, so that at least some of the flux circuits of one transformer pass through an adjacent transformer.
• FIG. 5 depicts a wind turbine disposed with three separate transformers 100, 100' 100", one for each phase, arranged in the longitudinal direction without air gaps between adjacent magnetically permeable members 224, 226, 324, 326 in the longitudinal direction.
• the revolute attachment may comprise the mounting 150 into which the transformer 100 is integrated.
• the mounting 150 may comprise a nacelle part 230 and a tower part 330 that couple together, and the primary 200 winding may be integrated into the nacelle part 230 and the secondary 300 winding may be integrated into the tower part 330.
• One of said mounting parts 230, 330 may comprise a cylindrical pin, the other of said mounting parts comprising a cylindrical cavity configured to slidably receive the cylindrical pin.
• the turbine tower 350 may be at least partially hollow.
• the nacelle 250 may be dismountably attached to the tower 350.
• the above described transformer 100 and system would be suitable for a three-phase 100kW wind turbine and may have a capacity of105kVA.
• the system is not necessarily limited to the aforementioned parameters.
• the invention is applicable over a range of wind turbine rated powers from small (e.g. several hundreds of watts) turbines to very large (e.g. tens of MW's) turbines.
• the present invention allows for easy removal of the nacelle 250 from a tower 350 that is fixed to the ground, the seabed or floating in sea.
• a lifting device (crane or even a helicopter) removes the complete nacelle structure 250 and separate primary 200 and secondary 300 side of the transformer 100 by lifting the nacelle 250 vertically.
• the tower 350 together with the secondary winding 350 of the transformer 150 may be left in place for indefinite time while the nacelle 250, and the primary winding 200 of the transformer 100, undergo maintenance. Repairs may be performed by replacing a complete nacelle 250 to ensure rapid resuming of power production while the faulty nacelle 250 is being investigated and repaired onshore.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Wind Motors (AREA)

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• 2010
  • 2010-10-29 WO PCT/EP2010/066488 patent/WO2012055443A1/en active Application Filing
  • 2010-10-29 EP EP10776633.9A patent/EP2633190A1/de not_active Withdrawn
  • 2010-10-29 CA CA2816166A patent/CA2816166A1/en not_active Abandoned
  • 2010-10-29 US US13/882,297 patent/US20130224013A1/en not_active Abandoned

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