EP4005046A1

EP4005046A1 - Power cable assembly for offshore wind farms

Info

Publication number: EP4005046A1
Application number: EP20730421.3A
Authority: EP
Inventors: Jörn Runge; Daniel Bartminn
Original assignee: RWE Renewables GmbH
Current assignee: Rwe Offshore Wind GmbH
Priority date: 2019-07-24
Filing date: 2020-06-03
Publication date: 2022-06-01
Also published as: US20220135363A1; WO2021013415A1; US11679953B2; DE102019119967A1

Abstract

The invention relates to a power cable assembly (100, 200, 300, 400, 500), in particular a submarine power cable assembly (100, 200, 300, 400, 500), for offshore wind farms, comprising: at least one cable drum device (102, 202, 302, 402, 502), which has a cable drum (104, 204, 304, 404, 504); and at least one power cable (108, 208, 508), which is wound on the cable drum (104, 204, 304, 404, 504) and has at least one cable end (110, 112, 210, 212, 510, 512) designed to be preinstalled at a cable connection (566, 568) of a wind power device (562, 564), the power cable (108, 208, 508) being wound on the cable drum (104, 204, 304, 404, 504) in such a way that a first portion (114, 214) of the power cable (108, 208, 508) is wound in the opposite direction to an additional portion (116, 216) of the power cable (108, 208, 508).

Description

Power cable arrangement for offshore wind farms

The application relates to a power cable arrangement, in particular one

Marine power cable arrangement, for offshore wind farms. In addition, the application relates to a wind energy system, in particular an offshore wind energy system, a cable drum device, a method for producing a

Power cable assembly and method for installing an offshore wind farm.

To provide electrical energy from so-called renewable sources

Energy sources are increasingly being used in wind parks with at least one wind turbine. A wind power plant is set up in particular to convert the kinetic wind energy into electrical energy. In order to increase the energy yield with such systems, wind farms at locations with a high

Wind probability arranged or installed. Offshore locations in particular are usually characterized by relatively continuous wind conditions and high average wind speeds, so that increasingly so-called

Offshore wind farms are built. As a rule, an offshore wind park has a large number of offshore wind energy devices, such as a large number of offshore wind turbines, measurement masts and / or at least one offshore substation, via which the offshore wind park electrically, for example, with an onshore substation or another Offshore substation or offshore converter station is connected. An onshore substation, in turn, can be connected to a public power grid. To transmit electrical energy between two offshore wind energy devices or an offshore wind energy device and an onshore device, energy cables are laid in the form of submarine cables. While it has been customary in offshore wind farms up to now, an offshore wind energy device (in particular a tower of an offshore wind energy device) through a foundation structure (e.g. monopile, tripod, tripile or jacket foundations) on the bottom of the water, in particular a seabed, directly To anchor, there have recently been increasing considerations to install floating offshore wind energy devices, for example floating offshore wind turbines, in order to install offshore wind farms, for example in areas with a great water depth, for example of more than 400 m.

However, the installation of a buoyant or floating offshore wind farm with a large number of offshore wind energy devices turns out to be complex and enormously expensive. In particular, the effort for laying, pulling in and terminating or connecting the power cables is the

Inner park cabling is complex and associated with correspondingly high costs. The cabling and the connection are made with special ships that use complex technologies. The effort and complexity are particularly evident in the costs that arise, for example for the pipe-laying vessel and the so-called service vessel (e.g. for the flushing process) amount to around € 100,000 per day.

In order to reduce the effort and complexity and thus the costs, it is known from the prior art to use preinstalled energy cables, in particular in the form of marine energy cables. In particular, a pre-installation, for example in a port, reduces the number of sources of error in the termination. Pre-installation means in particular that one end of the cable has a

Energy cable is already mechanically and electrically coupled to a cable connection of the offshore wind turbine, that is, connected. However, the transport and especially the later laying of the already terminated power cable are problematic. In the prior art, for example, there are always twists around the longitudinal axis of the cable or, for example, in the case of a

conventional cable drum, unwinding or unwinding is complete prevented. The mentioned rotations can damage the

Lead power cables.

The application is therefore based on the object of creating a possibility which enables a simpler and at the same time safe laying of power cables in which at least one end is already preinstalled on an offshore wind energy device and in particular the risk of a

Rotation of the power cable about the cable longitudinal axis is at least reduced.

According to a first aspect of the application, the object is achieved by a power cable arrangement, in particular a submarine power cable arrangement, for offshore wind farms, according to claim 1. The power cable arrangement comprises a

Cable drum device with at least one cable drum. The

Energy cable arrangement comprises at least one energy cable wound on the cable drum with at least one cable end, which is set up for preinstallation on a cable connection of a wind energy device. The power cable is wound onto the cable drum in such a way that a first section of the power cable is wound in the opposite direction to a further section of the power cable.

In contrast to the prior art, a possibility is provided according to the application, which enables a simpler and at the same time safe laying of

Enables power cables in which at least one end is already pre-installed on an offshore wind energy device and in particular the risk of a

Rotation of the power cable around the cable longitudinal axis is at least reduced in that a power cable is wound onto the cable drum in such a way that a first section of the power cable runs in the opposite direction to a further section of the

Power cable is wound.

The power cable assembly includes a cable reel device with a

Cable drum and a power cable wound on it, in particular in the form of a submarine cable. Such a power cable can have a length of 1 km (and more) to have. The length of a power cable corresponds in particular to the laying distance between two wind energy devices to be connected to one another (in addition, a certain length can be provided as a laying tolerance (eg at least 5 m)). The power cable is preferably a medium voltage cable (e.g. for

Voltages between 10 kV and 155 kV) or a high-voltage cable (for

Voltages up to 5 kV).

A power cable has two cable ends. At least one end of the cable can, if the power cable is pre-installed as intended, on a

Be connected cable connection of a wind energy device. Pre-installation means in particular that a cable end of a power cable is already mechanically and electrically coupled to a cable connection of the offshore wind power plant, that is to say is connected. In a further preferred variant of the application, both ends of the power cable can be preinstalled, each on one

Cable connection of a respective wind energy device.

The cable reel device comprises at least one cable reel. The

The cable drum is particularly cylindrical and is designed so that the power cable can be wound onto the cable drum. The diameter of the cable drum can be so large that the permissible bending radius of the

the energy cable to be wound is observed. The cable drum device can (exclusively) be formed by the cable drum. Can also

Cable drum device have at least one further element, such as at least one support element (for example a turntable), and for example a cable drum arranged on or on the further element, in particular the support element. In a coiled state of the energy cable arrangement according to the application, i.e. when the energy cable (except for the ends or end regions) is (completely) wound on the cable drum, a first section or a first partial length of the energy cable is in the opposite direction to a further section or a further Part of the length of the power cable wound. This means in particular that, during a winding process, a first section of the power cable has been wound onto the cable drum with a first direction of rotation or winding direction in a first winding step and the other section of the power cable onto the

Cable drum with a direction of rotation or winding direction opposite to the first direction of rotation has been wound up in a further winding step which is at least downstream of the first winding step. By being wound in the opposite direction, the power cable can be unwound or unrolled from the cable drum without (substantial) twisting occurring along the longitudinal axis of the power cable.

The power cable can preferably (only) be formed from the two sections (and the cable ends). The first section can particularly preferably have a length of approx. 50% of the total length of the power cable. Preferably, the length of the further section can have a length of approximately 50% of the total length of the

Have power cables. In other words, the length ratio of the two sections can be essentially 50:50.

According to a preferred embodiment of the application according to the application

Power cable arrangement, the cable drum device, in particular the

Cable drum, have at least one cable deflection device. The

Cable deflection device can be set up to deflect the power cable during winding onto the cable drum, in such a way that the first section of the power cable can be wound in the opposite direction to the further section of the power cable. In particular, a cable deflection device for guiding or guiding the

Power cable be set up such that the winding direction is changed.

In particular, the first section can first be wound up in a first winding direction, then deflected via the cable deflection device and then the further section can be (further) wound up in a further winding direction that is opposite to the first winding direction. According to a particularly preferred embodiment of the energy cable arrangement according to the application, the cable deflection device can be and / or comprise a substantially curved, in particular substantially semicircular, cable guide. Due to a semicircular shape, the power cable can be guided in a simple manner and, in particular, deflected by approximately 180 ° (at least between 150 ° and 210 °).

Preferably, the radius can be substantially semicircular

Cable guide have a length such that the permissible bending radius of the energy cable to be wound is maintained. The same applies to a curved cable guide. According to one embodiment of the power cable arrangement according to the application, the radius of the essentially semicircular cable guide can be at least seven times larger than the diameter of the

Energy cable. The same applies to a curved cable guide. Alternatively or additionally, the radius of the substantially semicircular

Cable routing must be at least greater than 50% of the cable drum radius, preferably at least greater than 75% of the cable drum radius, particularly preferably at least greater than 90% of the cable drum radius (and less than 100%).

The same applies to a curved cable guide. Correspondingly selected radii can be used to ensure that a

Damage to the power cable is avoided. With radii at least greater than 75% of the cable drum radius, particularly preferably at least greater than 90% of the cable drum radius (and less than 100%), a particularly smooth deflection can take place.

In order to guide the power cable in a defined manner along the (outer) semicircular arc of the preferably essentially semicircular cable guide, the cable deflection device, preferably the curved cable guide, in particular the essentially semicircular cable guide, can preferably have a U-profile, set up to guide the power cable. In particular, the Distance between the legs of the U-profile to the outer diameter (possibly with a certain tolerance) correspond.

According to a further embodiment, the cable deflection device can be attached to the cable drum device, preferably to the cable drum (indirectly or directly), in such a way that the essentially arcuate, in particular essentially semicircular, cable guide runs in a plane parallel to the cable drum axis. In particular, the drum axis of the cylindrical cable drum runs in the vertical direction. Then the plane can be a vertical direction. If the drum axis runs in the horizontal direction, the plane can be a horizontal plane. The

Assumed the intended state of the cable reel device, that is to say the state when, in particular, the power cable is wound and the

Cable reel device is in a stable position.

For particularly simple handling during the deflection, it is proposed that, according to this embodiment, the essentially arcuate,

In particular, semicircular, cable routing runs in a plane parallel to the cable drum axis, for example in a vertical plane, so the power cable is deflected by approximately 180 ° in a plane parallel to the cable drum axis. In other words, the

Cable deflection device largely in a plane parallel to

Be aligned cable drum axis. It goes without saying that in other variants of the application the essentially semicircular cable guide (at least partially) can run in a plane running at an angle to the drum axis, for example in a horizontal plane (in other words, the

In this case, the cable deflection device must be aligned largely horizontally).

According to a further preferred embodiment of the power cable arrangement according to the application, the cable deflection device can have a

Joint mechanism on the cable reel device, in particular the Cable drum (directly or indirectly), be attached. The hinge mechanism can at least between a first position in which the substantially

arc-shaped, in particular essentially semicircular, cable guide runs in a plane that runs parallel to the cable drum axis, and a second position in which the substantially arc-shaped, in particular essentially semicircular, cable guide runs in a plane that is parallel to the Cable drum axis extending plane has an angle of at least 45 °, preferably of at least 75 °, particularly preferably of substantially 90 °. For example, by means of the joint device, the essentially semicircular cable routing can initially be moved into a horizontal plane (in relation to a vertically running cable drum axis or

Drum axis) (corresponds to an angle of essentially 90 ° to the vertical plane). In this second state, the first section can be wound up in a simple manner, in particular without the essentially semicircular cable routing impairing the winding process. After the first section has been wound up, the essentially semicircular cable guide can be placed in the vertical plane by the hinge device. In this way, the power cable can be deflected in order to wind the further section in opposite directions. In a particularly simple manner, two sections can be wound in opposite directions (as described above).

The hinge mechanism can preferably comprise a securing module, set up to enable and / or block a movement of the curved, in particular semicircular, cable guide. The securing module, for example a locking module (e.g. a brake unit), in a released position can enable the hinge mechanism or the cable guide attached to it to be moved between the above-described first and second positions or positions. In a locked position, the security module can move the

Joint mechanism or the essentially semicircular cable guide attached to it (especially in the first position and in the second position) To block. It goes without saying that further positions or positions can be adjustable and in particular lockable.

According to a further particularly preferred embodiment of the

According to the power cable arrangement according to the application, the cable drum can have a first cable drum section and a second cable drum section, the first and second cable drum sections being freely rotatable relative to one another. The first section of the power cable can be wound onto the first cable drum section. The second section of the power cable can be wound onto the second cable drum section. The power cable can be processed in a particularly simple and reliable manner. For example, the first section can be unrolled by rotating the first cable drum section and then the further section can be unrolled by rotating the second cable drum section (or vice versa, or both can

Drum sections are rotated simultaneously (in opposite directions)). In particular, the cable drum can be formed from a central pipe structure and two pipe cross-sections (e.g. in the form of two outer pipes) arranged one above the other in the direction of the longitudinal axis of the central pipe structure (e.g. in the form of an inner pipe) which can be freely rotated relative to one another. The power cable can be wrapped around the two outer tubes in such a way that it wraps around each tube with an opposite direction of rotation.

Preferably, the extension of the cable deflection device in a vertical direction can essentially correspond to the length of the extension of a cable drum section in the vertical direction. This makes the winding process even easier. In other words, the cable deflection device can be arranged in such a way that the change in direction of rotation can take place between the two drums. This arrangement makes it possible, as has already been described, to roll off the first partial length of the power cable and then the further partial length of the power cable. As has already been described, the energy cable arrangement according to the application can be used for the installation in particular of an offshore wind farm, for example for the installation of a buoyant offshore wind energy device. The cable drum can, for example, on a

Be attached to the wind power plant or be stored on a ship which, if necessary, transports both foundation elements of the offshore wind power devices connected to the cable. Preferably, the power cable can land and / or in a port with each free end in a

Wind turbine are terminated. Then both can

Wind energy installations (or wind energy installation substructures) together with the cable drum can be transported to the location at which the first wind energy installation is to be installed. As soon as the first wind energy installation has been installed, the second wind energy installation can be moved to its destination position. The cable drum can be transported on a barge (or the like), which can move towards the installation site of the second wind turbine at a lower speed, for example (the energy cable being unwound during the movement).

According to a particularly preferred embodiment of the power cable arrangement according to the application, the cable drum device, in particular the cable drum, can be formed as a floatable cable drum device, in particular as a floatable cable drum. This means in particular that the cable drum device has at least one buoyancy body and / or forms it. In this context, a float or buoyancy body is to be understood as meaning in particular an object which, due to its buoyancy, is independently buoyant by displacement according to the Archimedean principle. A float can, for example, be at least partially hollow in its interior and / or filled with a light solid. Extra funds for one

Transport, such as an additional barge, can be omitted. A cable drum device can preferably have a turntable (also referred to as a turntable) as a support element, on which the cable drum can in particular be rotatably mounted. The turntable (or another support element) and / or the cable drum can be floatable. Is particularly preferred

Cable drum designed in such a way that it is aligned with the axis of rotation (resp.

Cable drum axis) floats parallel or vertically to the water surface. The power cable can in particular be wound up in such a way that when fully

Unwinding the cable reel device floats freely and in particular can be reused. In particular, the floating cable reel device is designed in this way (e.g. by a corresponding arrangement of

Floats and / or ballast material) that they are stable at all

Is settlement states.

Another aspect of the application is a wind energy system, in particular an offshore wind energy system. The wind energy system comprises at least one wind energy device with at least one cable connection. The

Wind energy system includes at least one previously described

Power cable assembly, one cable end of the power cable of

Power cable assembly is connected to the cable connector. This means in particular that a preinstalled wind energy device, in particular an offshore wind energy device, can be provided.

A wind energy device according to the application can in particular be an offshore wind energy device (in principle, however, an onshore wind energy device is also conceivable which can be coupled to an offshore wind energy device). Preferably, according to the application

Wind energy device be a floatable offshore wind energy device, in particular a floatable offshore wind turbine. An offshore wind turbine can have a generator that converts the kinetic energy of the wind into electrical energy. The generator can in particular be arranged in a gondola. In particular, a wind energy device according to the application is in a preinstalled state in a system according to the application in that at least one power cable end of at least one power cable is already mechanically and electrically coupled to a cable connection (e.g. a switch cabinet) of the wind power device, which is also referred to as terminated.

Another aspect of the application is a cable reel device for a

Marine power cables. The cable reel device includes a cable reel. The cable reel device comprises at least one cable deflection device, set up to deflect the power cable while it is being wound onto the cable drum, in such a way that the first section of the power cable can be wound in the opposite direction to the further section of the power cable.

The cable reel device is particularly one described above

Cable reel device with in particular one previously described

Cable deflection device that can be attached directly or indirectly to the cable drum. Indirect means in particular that both the cable drum and the cable deflection device can be arranged on a (common) support element or a further element.

Another aspect of the application is a method of making a

Power cable arrangement, in particular one previously described

Power cable arrangement. The procedure includes:

Winding a first section of a power cable onto a cable drum in a first direction of rotation in a first winding step, and

Winding up a further section of the power cable onto the cable drum in a direction of rotation opposite to the first direction of rotation in a further winding step that is at least downstream of the first winding step. In the method, in particular the winding process, a first section of the power cable (preferably of a maximum of two sections) is placed on the

Cable drum wound with a first direction of rotation or winding direction in a first winding step and then the further section of the power cable is wound onto the cable drum with a direction of rotation or winding direction opposite to the first direction of rotation in a further winding step.

According to a preferred embodiment of the method according to the application, the method can comprise:

Routing the power cable between the first via a cable deflection device fastened (directly or indirectly) to the cable drum

Winding step and the further winding step.

As described above, the power cable can be deflected in a simple manner using a previously described cable deflection device.

It goes without saying that part of the first section and / or part of the further section can run over the cable deflection device.

Yet another aspect of the application is a method for installing an offshore wind farm with at least one offshore wind energy device. The procedure includes:

Connecting at least one cable end of a power cable of a previously described power cable arrangement to a cable connection of the at least one offshore wind energy device,

Transporting the offshore wind energy device together with the power cable arrangement to an installation position of the offshore wind energy device, and

Unwinding the power cable. In particular, the method comprises a previously described preinstallation of an offshore wind energy device, in which, for example in a harbor, at least one cable end of a power cable of a previously described one

Energy cable arrangement is mechanically and electrically coupled to a cable connection of the at least one offshore wind energy device. After

The (preferably floatable) offshore wind energy device can be pre-installed together with the (preferably floatable)

Energy cable arrangement can be transported, e.g., by ship to the installation site, in particular towed. This can then be done at the installation site

Energy cables are unwound in the manner described above, and, if the other cable end is not yet connected to another wind energy device, in particular is preinstalled, to a cable connection of another

Wind energy device can be connected.

The characteristics of the power cable arrangements, wind energy systems,

Cable drum devices and processes can be freely combined with one another.

In particular, features of the description and / or the dependent

Claims, even with complete or partial circumvention of features of the independent claims, can be independently inventive on their own or freely combined with one another.

There are now a large number of possibilities that are subject to the application

Energy cable arrangement, the wind energy system according to the application, the

cable reel device according to the application and the

To design and further develop processes. For this purpose, reference is made, on the one hand, to the claims subordinate to the independent claims and, on the other hand, to the description of exemplary embodiments in conjunction with the drawing. In the drawing shows:

Fig. 1 is a schematic view of an embodiment of a

Power cable arrangement according to the present application, 2a shows a schematic view of a further exemplary embodiment of a

Power cable arrangement according to the present application,

2b shows a further schematic view of the exemplary embodiment of a

Power cable arrangement according to Figure 2a,

3a shows a schematic view of a further exemplary embodiment of a

Power cable arrangement according to the present application with a cable deflection device in a second position,

3b shows a further schematic view of the exemplary embodiment of a

Power cable arrangement according to Figure 3a with the

Cable deflection device in a first position,

4 shows a schematic view of a further exemplary embodiment of a

Power cable arrangement according to the present application,

Fig. 5 is a schematic view of an embodiment of an offshore

Wind energy system according to the present application,

6 shows a diagram of an exemplary embodiment of a method according to the present application, and FIG

7 shows a diagram of an exemplary embodiment of a further method according to the present application. In the figures, the same reference symbols are used for the same elements.

FIG. 1 shows a schematic view of an exemplary embodiment of a

Power cable assembly 100 according to the present application with a Cable reel device 102. In the present exemplary embodiment, the cable reel device 102 comprises a support element 106, for example in the form of a turntable 106, and a cable reel 104 mounted thereon (for example rotatably).

Furthermore, a coiled energy cable 108, in particular a marine energy cable 108, is shown. It should be noted here that only a small number of windings are shown for the sake of a better overview. In practice, a

Energy cables have a length of, for example, one kilometer.

As can be seen, the power cable 108 preferably has one

Medium-voltage cable (e.g. for voltage between 10 kV and 155 kV) or a high-voltage cable (for voltages up to 5 kV), via two (conventional) cable ends 110, 112. At least one cable end 110, 112, preferably both cable ends 110, 112, can / can be set up to preinstall the

Power cable 108 to a cable connection of a (not shown)

Wind energy device. Pre-installation means in particular that a cable end 110, 112 of the power cable 108 is already connected to a cable connection

Wind energy device, for example in a port, was mechanically and electrically coupled, so was connected.

The power cable 108 is divided into two sub-parts 114 and 116 in the present case. In other words, the power cable 108 shown consists of a first section 114 and a further or second section 116. The two sections 114, 116 can preferably be essentially the same length. The total length of the

Energy cable 108 corresponds in particular to the installation distance between two wind energy devices to be connected.

The power cable 108 is wound onto the cable drum 104 in such a way that the first section 114 of the power cable 108 is wound in the opposite direction to the further section 116 of the power cable 108. In particular, a transition area 118, the through part of the first section 114 and / or part of the further

Part 116 is formed can be seen in which the course of the power cable 108 is deflected by approximately 180 °.

It should be noted that the cable drum axis (in the illustrated stable state of the cable drum device 102) extends in the y direction. In the present example, the y-direction corresponds to the vertical direction.

Figures 2a and 2b show schematic views of another

Embodiment of a power cable arrangement 200 according to the present application with an embodiment of a cable drum device 202 according to the present application. To avoid repetition, only the differences from the previous one are essentially described below

Embodiment described and otherwise referred to the previous statements.

In the present exemplary embodiment, the cable reel device 202 has at least one cable deflection device 220, set up to deflect the power cable 208 such that the first section 214 of the power cable 208 can be wound in the opposite direction to the further section 216 of the power cable 208. The cable deflection device 220 in the present case has an essentially arcuate, preferably essentially semicircular (e.g. between 150 ° and 210 °) cable guide 222, which is connected in particular via a connecting element 224 to the cable reel device 202, in the present case in particular directly on the

Cable drum 204 attached. It goes without saying that the cable routing in other variants can also have other shapes, such as semi-oval,

quarter circle etc.

In particular, the power cable 208 can be along the outer arch, the

in particular as a U-profile, the cable guide 222 be guided. As can be seen, the power cable 208 (in a parallel to the cable drum axis 219 running plane) deflected by approx. 180 °. In this way, it can be achieved in a simple manner that the energy cable 208 can be wound onto the cable drum 204 in one winding process in such a way that the first section 214 of the energy cable 208 can be wound in the opposite direction to the further section 216 of the energy cable 208.

As can be seen, the radius 226 of a substantially semicircular cable guide 222 can be at least seven times larger than the diameter of the

Power cable 208. Alternatively or additionally, the radius 226 of a substantially semicircular cable guide 222 can be at least greater than 50% of the cable drum radius 228, preferably at least greater than 75%

Cable drum radius 228, particularly preferably at least greater than 90% of the cable drum radius 228.

The illustrated cable reel device 202 may be buoyant.

For example, at least one floating body can be integrated in the support element 206 and / or in the cable drum 204 and / or form this.

Figures 3a and 3b show schematic views of another

Embodiment of a power cable arrangement 300 according to the present application with an embodiment of a cable drum device 302 according to the present application. To avoid repetition, only the differences from the previous ones are described below

Embodiments described and otherwise referred to the previous statements. It should also be noted that a power cable has not been shown in order to provide a better overview.

In particular, FIGS. 3a and 3b show a cable drum device 302 with a (foldable) cable deflection device 320 in a first position or

Position and in a second position or position. In order to be able to adjust the cable deflection device 320 between the at least two positions or positions, the cable deflection device 320 has a

Link mechanism 340. In particular, the arcuate part 322 is attached to the cable drum device 302 via the joint mechanism 340 (and in the present case via the connecting element 324, which can also be omitted). In the present case, the cable deflection device 320 is fastened directly or directly to the cable drum 304. In FIG. 3b, the cable deflection device 320 (or the hinge mechanism 340) is set in the first position or is in the first position. In this first position, the curved cable guide 322 is in a plane 330

(in the present case a vertical plane 330) parallel to the cable drum axis 319. In this position, a power cable can be deflected in a particularly simple manner, as has been described above. In addition, this position is also advantageous during transport (with or without a power cable), since the cable drum device 302 is compact in this position.

From this first position, the cable deflection device 320 (or the

Hinge mechanism 340) can be placed in a second position. In particular, the cable deflection device 320 or the hinge mechanism 340 can be moved into the second position in which the essentially arcuate, in particular in the

Essentially semicircular, cable guide 322 runs in a plane 332, which has an angle 333 of at least 45 °, preferably of at least 75 °, particularly preferably of essentially 90 °, to the plane 330 running parallel to the cable drum axis 319, as exemplified in Figure 3a .

In particular, in this position, the cable deflection device 320 is folded away from the circumferential drum wall. The advantage of this position is that the winding of the power cable, in particular the first section, is not, or at least hardly, impaired by the cable deflection device 320.

The winding process can be facilitated. In addition, at least one cable holder 346 is advantageously arranged on the cable drum 304 in the upper half of the cable drum 304 in order to be able to hold the deflected power cable 308 (and in particular to guide it into the upper region of the cable drum 304).

FIG. 4 shows a schematic view of a further exemplary embodiment of a power cable arrangement 400 according to the present application with a

Embodiment of a cable reel device 402 according to the present application. To avoid repetition, the

Essentially only the differences from the previous exemplary embodiments are described and otherwise reference is made to the previous statements. It should also be noted that a power cable has not been shown in order to provide a better overview.

The illustrated cable drum 404 has a first cable drum section 450 and a second or further cable drum section 452, the first and second cable drum sections 450, 452 being freely rotatable relative to one another. The first section of the power cable can be on the first

Cable drum section 450 be wound. The second section of the power cable can be wound onto the second cable drum section 452. In a particularly simple and reliable manner, the

Energy cable. For example, the first section can be unrolled by rotating the first cable drum section 450 and then the further section can be unrolled by rotating the second cable drum section 452 (or vice versa). Also a simultaneous twisting of the

Cable drum sections 450, 452 can be made

In particular, the cable drum 404 can consist of a central tubular structure 454 and two in the longitudinal axis direction 419 of the central tubular structure 454 (for example in the form of a Inner tube 454) of tube cross-sections 450, 452 arranged one above the other (for example in the form of two outer tubes 450, 452), which can be freely rotated relative to one another. The power cable can be wrapped around the two outer tubes 450, 452 in such a way that it wraps around each tube 450, 452 with an opposite direction of rotation.

A cable deflection device 420, for example in accordance with FIG. 2 or FIG. 3, is also arranged. In the present case, the cable deflection device 420 is attached to the central tubular structure 454.

Preferably, the extension of the cable deflection device 420 in a direction along the cable drum axis 419 the length of the extension of a

Cable drum section 450, 452 (in this case the first cable drum section 450) in the y-direction (in this case the vertical direction) essentially correspond. This makes the winding process even easier.

FIG. 5 shows a schematic view of an exemplary embodiment of a

Offshore wind energy system 560 according to the present application. The system 560 comprises in particular a power cable arrangement 500, for example corresponding to an arrangement according to one of FIGS. 1 to 4.

The offshore wind energy system 560 has here in addition to

Power cable assembly 500 has two offshore wind energy devices 562, 564 (e.g. two offshore wind turbines 562, 564). It goes without saying that only a single offshore wind energy device can be provided in other variants of the application.

The offshore wind energy system 560 is shown in a pre-installed state. In this state, at least a first cable end 510 is mechanically and electrically coupled to a cable connection 568 (for example a switch cabinet) of the first offshore wind energy device 564. In the present exemplary embodiment, the further cable end 512 is also provided with a cable connection 566 (for example a switch cabinet) of the further offshore wind energy device 562 mechanically and electrically coupled. In addition, the power cable 508 is wound onto the cable drum 504 in this state.

As can also be seen, the elements 500, 562, 564 shown are buoyant. Numeral 570 denotes the water surface. In this pre-installed state, the offshore wind energy system 560 can be moved to a specific installation location, for example by a tug

be transported. For example, the first offshore wind energy device 564 can initially be anchored there. The second offshore wind energy device 562 can then be transported to its installation site and at the same time the power cable can be unwound from the cable drum device 502. The installation process can be simplified significantly.

FIG. 6 shows a diagram of an exemplary embodiment of a method according to the present application. For example, the method for producing a power cable arrangement according to one of FIGS. 1 to 4 can be used.

In the method, in particular the winding process, a first section of the power cable (of a maximum of two sections) is wound onto the cable drum with a first direction of rotation or winding direction in a first winding step 601. The further section of the power cable is wound onto the cable drum with a direction of rotation or winding direction opposite to the first direction of rotation in a further winding step 603. In step 602, the power cable is deflected, for example using a previously described cable deflection device. It goes without saying that part of the first section and / or part of the further section can run over the cable deflection device. FIG. 7 shows a diagram of an exemplary embodiment of a further method according to the present application. The method can be used to install an offshore wind energy system, as is shown by way of example in FIG. In a first step 701, at least one cable end of a power cable of a previously described power cable arrangement is connected to a cable connection of the at least one offshore wind energy device. In a further step 702, the offshore wind energy device is transported together with the power cable arrangement to an installation position of the offshore wind energy device. In a further step 703, the power cable is unwound.

In particular, the method comprises a previously described preinstallation of an offshore wind energy device, in which, for example in a harbor, at least one cable end of a power cable of a previously described one

Energy cable arrangement is mechanically and electrically coupled to a cable connection of the at least one offshore wind energy device (step 701).

After the pre-installation, the offshore wind energy device can be transported, in particular towed, together with the (for example floatable energy cable arrangement), for example by a ship, to the installation site.

At the installation site, the power cable can then be unwound in the manner described above (step 703) and, if the further cable end is not yet connected to another wind energy device, in particular is preinstalled, it can be connected to a cable connection of a further wind energy device.

Claims

Patent claims

1. Power cable assembly (100, 200, 300, 400, 500), in particular

Marine power cable assembly (100, 200, 300, 400, 500), for offshore wind farms, comprising:

at least one cable reel device (102, 202, 302, 402, 502) with a cable reel (104, 204, 304, 404, 504), and

at least one power cable (108, 208, 508) wound on the cable drum (104, 204, 304, 404, 504) with at least one cable end (110, 112, 210, 212, 510, 512) that is configured for preinstallation on a Cable connection (566, 568) of a wind energy device (562, 564),

wherein the power cable (108, 208, 508) on the cable drum (104, 204, 304, 404, 504) is wound in such a way that a first section (114, 214) of the power cable (108, 208, 508) opposite to a another section (116, 216) of the power cable (108, 208, 508) is wound.

2. Power cable arrangement (100, 200, 300, 400, 500) according to claim 1, characterized in that

the cable drum device (102, 202, 302, 402, 502) has at least one cable deflection device (220, 320, 420), set up for deflecting the power cable (108, 208, 508) during winding onto the

Cable drum (104, 204, 304, 404, 504) in such a way that the first section (114, 214) of the power cable (108, 208, 508) is opposite to the further section (116, 216) of the power cable (108, 208, 508) can be wound.

3. Power cable arrangement (100, 200, 300, 400, 500) according to claim 2, characterized in that the cable deflection device (220, 320, 420) comprises an essentially arcuate, in particular essentially semicircular, cable guide (222, 322, 422).

4. Power cable arrangement (100, 200, 300, 400, 500) according to claim 3, characterized in that

the radius (226) of a substantially semicircular cable guide (222, 322, 422) is at least seven times larger than the diameter of the

Energy cables (108, 208, 508),

and or

the radius (226) of a substantially semicircular cable guide (222, 322, 422) is at least greater than 50% of the cable drum radius (228), preferably at least greater than 75% of the cable drum radius (228), particularly preferably at least greater than 90% of the cable drum radius (228).

5. Power cable arrangement (100, 200, 300, 400, 500) according to one of claims 2 to 4, characterized in that

the cable deflection device (220, 320, 420) is attached to the cable reel device (102, 202, 302, 402, 502) in such a way that the essentially arcuate, in particular essentially semicircular, cable guide (222, 322, 422) in one plane runs parallel to the cable drum axis (219, 319, 419).

6. Power cable arrangement (100, 200, 300, 400, 500) according to one of claims 2 to 5, characterized in that

the cable deflection device (220, 320, 420) is attached to the cable drum device (102, 202, 302, 402, 502) with a hinge mechanism (340), the hinge mechanism (340) at least between a first position in which the substantially arcuate , in particular essentially semicircular, cable guide (222, 322, 422) in a plane parallel to Cable drum axis (219, 319, 419) runs, and a second position is movable in which the substantially arcuate, in particular in

Substantially semicircular, cable guide (222, 322, 422) runs in a plane which has an angle of at least 45 °, preferably of at least 75 °, particularly preferably of im to the plane running parallel to the cable drum axis (219, 319, 419) Essentially 90 °.

7. Power cable arrangement (100, 200, 300, 400, 500) according to one of the preceding claims, characterized in that

the cable drum (104, 204, 304, 404, 504) has a first cable drum section (450) and a second cable drum section (452), the first and second cable drum sections (450, 452) being freely rotatable relative to one another, and

the first section (114, 214) of the power cable (108, 208, 508) is wound onto the first cable drum section (450), and

the second section (116, 216) of the power cable (108, 208, 508) is wound onto the second cable drum section (452).

8. Power cable arrangement (100, 200, 300, 400, 500) according to one of the preceding claims, characterized in that

the cable drum device (102, 202, 302, 402, 502) is formed as a buoyant cable drum device (102, 202, 302, 402, 502).

9. Wind energy system (560), in particular offshore wind energy system (560), comprising:

at least one wind energy device (562, 564) with at least one cable connection (566, 568), and

at least one power cable arrangement (100, 200, 300, 400, 500) according to one of the preceding claims, wherein a cable end (510, 512) of the power cable (508) of the power cable assembly (100, 200, 300, 400, 500) with the

Cable connector (566, 568) is connected.

10. A cable reel device (102, 202, 302, 402, 502) for a marine power cable (108, 208, 508) comprising:

a cable drum (104, 204, 304, 404, 504), and

at least one cable deflection device (220, 320, 420), set up to deflect the power cable (108, 208, 508) during winding onto the cable drum (104, 204, 304, 404, 504), in such a way that the first section (114, 214) of the energy cable (108, 208, 508) can be wound in the opposite direction to the further section (114, 214) of the energy cable (108, 208, 508).

11. A method for producing a power cable arrangement (100, 200, 300, 400, 500), in particular a power cable arrangement (100, 200, 300, 400, 500) according to one of the preceding claims, comprising:

Winding up a first section (114, 214) of a power cable (108, 208, 508) onto a cable drum (104, 204, 304, 404, 504) in a first

Direction of rotation in a first winding step, and

Winding up a further section (116, 216) of the power cable (108, 208, 508) onto the cable drum (104, 204, 304, 404, 504) in a direction of rotation opposite to the first direction of rotation in a further winding step, which is at least the first winding step is subordinate.

12. The method according to claim 11, characterized in that the method comprises:

Routing the power cable (108, 208, 508) over a cable deflection device (220, 320, 420) fastened to the cable drum (104, 204, 304, 404, 504) between the first winding step and the further winding step.

13. A method for installing an offshore wind farm having at least one offshore wind energy device (562, 564), comprising:

Connecting at least one cable end (110, 112, 210, 212, 510, 512) of a power cable (108, 208, 508) of a power cable arrangement (100, 200, 300, 400, 500) according to one of claims 1 to 9 to a cable connection (566, 568) of the at least one offshore wind energy device (562, 564), transporting the offshore wind energy device (562, 564) together with the power cable arrangement (100, 200, 300, 400, 500) to a

Installation position of the offshore wind power device (562, 564), and

Unwinding the power cable (108, 208, 508).