Submarine connection box for submarine power cable

Abstract

To provide a submarine connection box for a submarine power cable which has a short cable length and is connectable without requiring many attachments.SOLUTION: In a submarine power cable assembly 1, a submarine connection box 3 for connecting submarine power cables comprises: a casing 5 which has a first opening 7a receiving N submarine power cables and a second opening 7b receiving K submarine power cables; a terminal box 6 arranged inside the casing and including a housing 4 with a first box end 6a which includes a first group of openings receiving a submarine power cable core 9 of each of N submarine power cables and a second box end 6b which includes a second group of openings receiving a submarine power cable core 15 of each of K submarine power cables; and L sets of connectors arranged inside the terminal box so as to connect corresponding submarine power cable cores of N submarine power cables and K submarine power cables.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates generally to submarine power cable accessories. [Background technology]

[0002] An offshore wind farm typically comprises multiple wind turbines connected by undersea array cables to an offshore substation from which undersea export cables transport the power to shore.

[0003] Typically, the wind turbines are connected in a daisy chain configuration, such that each array cable is suspended between adjacent wind turbine platforms.

[0004] A drawback of this configuration is that many cable lengths are required for the connections, and it also requires many accessories such as subsea buoys and bending stiffeners where the array cables are attached to the wind turbine platform. Summary of the Invention

[0005] A general object of the present disclosure is to provide a subsea connection box that solves or at least mitigates problems in the prior art.

[0006] Thus, according to a first aspect of the present disclosure, there is provided a submarine connection box for connecting a system of submarine power cables each comprising at least one submarine power cable core, the submarine connection box comprising: a casing having N first openings configured to receive a respective submarine power cable of a first set of N submarine power cables, where N is an integer greater than or equal to 1, and the casing having K second openings configured to receive a respective submarine power cable of a second set of K submarine power cables, where K is an integer greater than 1, and a termination box disposed inside the casing, the housing including the first group of openings and the second group of openings. a termination box, each of the openings in the first group configured to receive a respective submarine power cable core of a first set of N submarine power cables and each of the openings in the second group configured to receive a respective submarine power cable core of a second set of K submarine power cables; and L sets of connectors disposed within the termination box, where L is an integer equal to a number of electrical phases or poles of the system of submarine power cables, and for each of the L sets, the connectors are electrically interconnected with each other and configured to connect submarine power cable cores of corresponding electrical phases or poles of the first set of N submarine power cables and the second set of K submarine power cables.

[0007] The connection box allows for connecting one end of each of K submarine power cables, such as array cables, to the connection box and connecting the other end of each of the K submarine power cables to each of K offshore power sources, such as K wind turbines. The connection box is thus used to collect power from several offshore power sources. Furthermore, the connection box allows for the connection of at least one submarine power cable, as well as an array cable, which relays power from the K submarine power cables on the seabed towards an offshore substation. Thus, the array cables of an offshore installation using the connection box do not extend in a daisy chain between the offshore power sources. Instead, up to N+K-1 array cables can be collected underwater by the connection box, which can be connected to another connection box by an array cable that extends only to the seabed, and can also be connected to N+K-1 or N+K-2 array cables connected to wind turbines, etc., leading to an offshore substation. Since the array cables only need to be suspended from the offshore power source to the seabed or run along their entire length along the seabed, rather than returning to another offshore power source, substantial cable length can be saved, thus also saving half of the accessories such as bending stiffeners, subsea buoys and terminations.

[0008] The first set of submarine power cables may be AC ​​or DC submarine power cables.

[0009] The first set of submarine power cables may be medium or high voltage submarine power cables.

[0010] The second set of submarine power cables may be AC ​​or DC submarine power cables.

[0011] The second set of submarine power cables may be medium or high voltage submarine power cables.

[0012] According to one embodiment, N is 2 and K is 2.

[0013] N may be greater than 2, such as 3, 4, 5, or 6, in some examples.

[0014] In some examples, K may be greater than two, such as three, four, five, or six.

[0015] According to one embodiment, the connector is T-shaped.

[0016] According to one embodiment, the stem of each T-connector comprises a female connector configured to receive a submarine power cable core.

[0017] According to one embodiment, each female connector in the stem includes a stress cone.

[0018] According to one embodiment, each T-shaped connector includes a cable lug extending from a stem to an arm and a contact bolt connected to the cable lug.

[0019] According to one embodiment, one of the arms of the T-shaped connector comprises a male connector.

[0020] According to one embodiment, one of the arms of some T-connectors comprises a female connector connected to a male connector of one of the arms of another T-connector.

[0021] According to one embodiment, the N submarine power cables and the K submarine power cables are AC power cables and the T-shaped connectors are arranged in three rows, or the N submarine power cables and the K submarine power cables are DC power cables and the T-shaped connectors are arranged in two rows.

[0022] Thus, if the N submarine power cables and the K submarine power cables are three-phase AC power cables, then L=3 and three sets of electrically interconnected connectors may be arranged in three rows.

[0023] If the N submarine power cables and the K submarine power cables are DC power cables, the N submarine power cables and the K submarine power cables include two poles, so L = 2. In this case, the two sets of electrically interconnected connectors may be arranged in two rows.

[0024] According to one embodiment, each row comprises N+K T-connectors.

[0025] According to a second aspect of the present disclosure, there is provided a submarine power cable assembly comprising a connection box according to the first aspect and N+K submarine power cables, the N submarine power cables extending into the casing through respective ones of the N first openings and the K submarine power cables extending into the casing through respective ones of the K second openings.

[0026] According to one embodiment, the N+K submarine power cables are AC power cables and the T-shaped connectors of each of the three rows are connected to submarine power cable cores of the same electrical phase, or the N+K submarine power cables are DC power cables and the T-shaped connectors of each of the two rows are connected to submarine power cable cores having the same polarity.

[0027] Thus, for AC power cables, each row represents a respective electrical phase and all connectors in a row are connected to submarine power cable cores of the corresponding electrical phase, and for DC power cables, each row represents a respective pole and all connectors in a row are connected to submarine power cable cores of the corresponding pole or polarity.

[0028] According to a third aspect of the present disclosure, there is provided an offshore wind farm comprising a plurality of wind turbines, an offshore substation, and a plurality of subsea power cable assemblies according to the second aspect, wherein for each connection box, a majority of the K+N subsea power cables connected to the connection box are connected to a respective wind turbine, at least one of the N subsea power cables connected to the connection box is connected to another connection box, and one of the N subsea power cables connected to one of the connection boxes is connected to the offshore substation.

[0029] In the above paragraph, connected to means directly connected.

[0030] According to one embodiment, for each connection box, each of the submarine power cables connected to the connection box and the wind turbine is a dynamic submarine power cable, and at least one of the N submarine power cables connected to the connection box is a static submarine power cable.

[0031] In general, all terms used in the claims should be interpreted according to their ordinary meaning in the art unless otherwise expressly defined herein. All references to "a / an / the element, apparatus, component, means, etc." should be interpreted non-limitingly as referring to at least one example of the element, apparatus, component, means, etc., unless otherwise specified.

[0032] Specific embodiments of the inventive concept will now be described, by way of example, with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0033] [Figure 1] 1 illustrates a schematic of an example of a submarine power cable assembly including a submarine junction box with a partially removed casing. [Diagram 2]2 illustrates a close-up view of the termination box inside the connection box of FIG. 1 with the termination box housing partially removed to expose the interior of the termination box. [Diagram 3] 1 shows a longitudinal section of a T-connector with an arm having a female connector. [Figure 4] 4 shows longitudinal sections of two interconnected T-connectors, one being the T-connector shown in FIG. 3 and the other being a T-connector having an arm with a male connector. [Diagram 5] 1 illustrates a schematic diagram of an offshore wind farm including a plurality of subsea power cable assemblies. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The inventive concept will now be more fully described below with reference to the accompanying drawings, in which exemplary embodiments are shown. However, the inventive concept may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. Like reference numerals refer to like elements throughout the description.

[0035] FIG. 1 shows an example of a submarine power cable assembly 1.

[0036] The submarine power cable assembly 1 comprises a connection box 3 configured to interconnect N+K submarine power cables.

[0037] Each of the N+K submarine power cables comprises at least one submarine power cable core.

[0038] Each submarine power cable core comprises a conductor, an insulation system disposed about the conductor, and a waterstop layer disposed about the insulation system. The waterstop layer may include a polymeric sheath and / or a metallic sheath, such as a lead sheath, a copper sheath, an aluminum sheath, a stainless steel sheath, or a sheath including an alloy including one of the aforementioned metals.

[0039] N is an integer equal to or greater than 1. In this example, N=2. K is an integer equal to or greater than 2. In this example, K=2.

[0040] The submarine power cable assembly 1 comprises a first set of N submarine power cables (not shown in FIG. 1) and a second set of K submarine power cables.

[0041] The subsea connection box 3 comprises a casing 5. In Figure 1, a portion of the casing 5 has been removed to expose the interior of the subsea connection box 3.

[0042] The exemplary casing 5 has a first surface 5a and a second surface 5b, which in this example is located opposite the first surface 5a.

[0043] The subsea connection box 3 comprises a termination box 6 arranged inside a casing 5. The termination box 6 has a housing 4.

[0044] The termination box 6 is, according to one example, arranged between the first face 5a and the second face 5b.

[0045] The first face 5a is provided with N first openings 7a, which pass through the first face 5a, i.e. are first through openings, and each of the N first openings 7a is configured to receive a respective submarine power cable of the first set of N submarine power cables.

[0046] Each of the N first openings 7a receives a respective submarine power cable of the first set.

[0047] Each of the submarine power cables is surrounded by a respective bend limiter (not shown), each bend limiter being connected to the first face 5a, for example by screws and bolts.

[0048] Inside the submarine connection box 3 at least one submarine power cable core 9 of each of the N submarine power cables of the first set is exposed.

[0049] The N submarine power cables may be armored. Thus, each of the N submarine power cables may comprise one or more armor layers.

[0050] The armour layer or layers are attached to the subsea connection box 3. The subsea connection box 3 may comprise N clamp flanges 11 attached to the first face 5a around the respective first openings 7a. The clamp flanges 11 may be arranged inside the casing 5 as shown in FIG. 1. Each of the N clamp flanges clamps an armour wire between itself and the first face 5a. Alternatively, the armour wire can be welded to the subsea connection box 3, for example to weld a sleeve.

[0051] The second face 5b is provided with K second openings 7b that pass through the second face 5b, i.e. are second through openings, and each of the K second openings 7b is configured to receive a respective submarine power cable of the second set of K submarine power cables.

[0052] In this example, each of the K second openings 7b receives a respective submarine power cable of the second set of K submarine power cables. Each of the K submarine power cables is surrounded by a respective bend limiter 13. Each bend limiter 13 is connected to the second face 5b, for example by means of a screw and a bolt.

[0053] Inside the submarine connection box 3, at least one submarine power cable core 15 of each of the second set of K submarine power cables is exposed.

[0054] The K submarine power cables may be armored. Thus, each of the K submarine power cables may comprise one or more armor layers.

[0055] The one or more armour layers are attached to the subsea connection box 3. The subsea connection box 3 may comprise K clamp flanges (not shown) attached to the second face 5b around respective second openings 7b. Each of the K clamp flanges clamps an armour wire between itself and the second face 5b. Alternatively, the armour wire may be welded to the subsea connection box 3, for example to weld a sleeve.

[0056] The submarine power cable cores 9 of the first set of N submarine power cables are led into the termination box 6 through the N first openings 7a. The housing 4 of the termination box 6 includes a first group of openings (not shown) each configured to receive a respective submarine power cable core 9 of the first set of N submarine power cables. The first group of openings are through openings.

[0057] The submarine power cable cores 15 of the second set of K submarine power cables are led into the termination box 6 through the K second openings 7b. The housing 4 of the termination box 6 includes a second group of openings 6c each configured to receive a respective submarine power cable core 15 of the second set of K submarine power cables. The second group of openings are through openings.

[0058] According to this example, the termination box 6 has a first box end 6a facing the first face 5a. The first box end 6a includes a first group of openings each configured to receive a respective submarine power cable core 9.

[0059] According to this example, the termination box 6 has a second box end 6b facing the second face 5b. The second box end 6b includes a second group of openings each configured to receive a respective submarine power cable core 15.

[0060] The submarine power cable cores 9 are sealed against the first box end 6a. For example, the termination box 6 may comprise an elastic annular member arranged with an interference fit around each of the submarine power cable cores 9, also sealing against the first box end 6a to prevent water ingress into the termination box 6. Alternatively, the waterstop layer of each submarine power cable core 9 may be welded or soldered to the termination box 6 along its entire circumference and around each of the first group of openings.

[0061] The submarine power cable cores 15 are sealed against the second box end 6b. For example, the termination box 6 may comprise an elastic annular member arranged with an interference fit around each of the submarine power cable cores 15, also sealing against the second box end 6b to prevent water ingress into the termination box 6. Alternatively, the waterstop layer of each submarine power cable core 15 may be welded or soldered to the termination box 6 around each of the second group of openings along its entire circumference.

[0062] When the submarine power cable cores 9 and 15 are installed in the termination box 6, the termination box 6 is watertight.

[0063] The connection box 3 may comprise a fiber optic splice box 17 arranged inside the casing 5. The fiber optic splice box 17 is configured to hold spliced ​​fiber optic cables 21 of the N and K submarine power cables, preferably in a watertight manner. The fiber optic cables 21 may extend from the first face 5a and the second face 5b to the fiber optic splice box 17. The termination box 1 may comprise an internal frame 19 in which the fiber optic splice box 17 is mounted.

[0064] The connection box 3 may comprise lifting lugs 1a, 1b. The lifting lugs 1a, 1b may be arranged at the upper end of the casing 5. The lifting lugs 1a, 1b may be arranged at each end of the casing 5. For example, a first lifting lug 1a may extend from the first face 5a and a second lifting lug 1b may extend from the second face 5b. The lifting lugs 1a, 1b are used for lifting the connection box 1, for example during an installation procedure.

[0065] The connection box 3 may, for example, have a substantially rectangular parallelepiped shape or a triangular shape. For example, the connection box 3 may have an elongated substantially rectangular shape, the first face 5a may be a first axial end face, and the second face 5b may be a second axial end face. In general, the connection box may have any polyhedral shape, and the first face and the second face do not have to be arranged opposite each other. The first face and the second face may, for example, be any face of a polyhedron, and may be the same face. The face may be planar or non-planar. Furthermore, according to some examples, a first subset of the N first openings may be arranged in one face, and a second subset of the N first openings may be arranged in another face, independent of the first subset. According to some examples, a first subset of the K second openings may be arranged in one face, and a second subset of the K second openings may be arranged in another face, independent of the first subset of the K second openings.

[0066] When the submarine power cable assembly 1 is installed on the seabed, the casing 5 of the connection box 3 is filled with seawater.

[0067] FIG. 2 shows an enlarged view of the termination box 6 with the housing partially removed to expose the interior.

[0068] The termination box 6 comprises L sets of electrically interconnected connectors 23 such that in each of the L sets, the connectors 23 of that set are electrically interconnected with each other.

[0069] Each of the L sets of connectors 23 is configured to connect submarine power cable core(s) 9 of a first set of submarine power cables to submarine power cable cores 15 of a second set of submarine power cables. Each of the L sets of connectors 23 represents a particular electrical phase or pole. All submarine power cable cores 9 and 15 representing the same electrical phase or pole are connected to a corresponding set of connectors 23.

[0070] If the submarine power cable system is a three-phase AC power cable system, the connectors 23 may be arranged in three rows, with the connectors 23 in each row being electrically interconnected with each other, where L=3, representing each of the three sets.

[0071] If the first set of N submarine power cables and the second set of K submarine power cables are AC power cables, each string is connected to submarine power cable cores 9, 15 having a common electrical phase. For example, in a three-phase system, all of the submarine power cable cores 9, 15 connected to phase a are connected to connectors forming a first string of three strings, all of the submarine power cable cores 9, 15 connected to phase B are connected to connectors forming a second string of three strings, and all of the submarine power cable cores 9, 15 connected to phase C are connected to connectors forming a third string of three strings.

[0072] If the submarine power cable system is a DC power cable system, the connectors 23 may be arranged in two rows, the connectors 23 in each row being electrically interconnected with each other, representing each of the two sets, where L=2.

[0073] If the first set of N submarine power cables and the second set of K submarine power cables are DC power cables, each of the two strings is connected to submarine power cable cores 9, 15 having a common polarity. For example, each submarine power cable core 9, 15 that is positive is connected to a connector that forms a first of the two strings, and each submarine power cable core 9, 15 that is negative is connected to a connector that forms a second of the two strings.

[0074] Each row comprises N+K interconnected connectors 23 .

[0075] The connectors 23 may be T-shaped. The T-shaped connectors 23 may be of two different types, alternately connected in each row. These two types may be referred to as Type 1 and Type 2 T-connectors.

[0076] An example of a Type 1 T-shaped connector 23-1 is shown in Fig. 3. The T-shaped connector 23-1 shown in Fig. 3 has a stem 23a and two arms 23b-1 and 23c-1. The stem 23a has a female connector configured to receive a submarine power cable core 9 or 15. Each of the arms 23b-1 and 23c-1 has a female connector.

[0077] The female connector in the stem 23a includes a stress cone 23d configured to surround the submarine power cable core 9, 15, with the outer semiconductive layer of the insulation system of the submarine power cable core 9, 15 having been removed to control the electric field in this region.

[0078] The T-shaped connector 23-1 is provided with a cable lug 23e including a connection piece 24 to which the ends of the conductors of the submarine power cable cores 9, 15 are mechanically and electrically fixed.

[0079] A cable lug 23e extends from the stem 23a to the arms 23b-1, 23c-1. The T-connector 23-1 also includes a contact bolt 23f connected to the cable lug 23e. The contact bolt 23f can be used to connect the T-connector 23-1 to another T-connector that includes a male connector on one of its arms.

[0080] 4 shows T-shaped connector 23-1 connected to T-shaped connector 23-2, a Type 2 T-shaped connector. T-shaped connector 23-2 has a stem 23d and two arms 23b-2 and 23c-2. Arm 23b-2 has a male connector. This male connector may be connected to the female connector of arm 23c-1 of T-shaped connector 23-1, as shown in FIG.

[0081] The other arm 23c-2 of the T-connector 23-2 may be a female connector that may be connected or plugged into a male connector on an arm of another T-connector 23-2, as in the example shown in FIG.

[0082] The number of T-connectors 23-1, 23-2 used in the termination box 6 depends on the integers N and K and the number of electrical phases or poles.

[0083] 5 shows an offshore wind farm 25. The offshore wind farm 25 includes a number of wind turbines 27a to 27n. The wind turbines 27a to 27n may be floating wind turbines or wind turbines standing on platforms installed on the seabed.

[0084] The offshore wind farm 25 comprises a number of subsea power cable assemblies 1 .

[0085] The offshore wind power plant 25 further includes an offshore substation 31. The offshore substation 31 is connected to the wind turbines 27a to 27N.

[0086] Each connection box 3 is connected to multiple wind turbines 27a to 27n. Furthermore, each connection box 3 is connected to another connection box 3 by a submarine power cable, and one of the connection boxes 3 is connected to an offshore substation 31 by a submarine power cable.

[0087] In the example of Fig. 5, N=2 and K=2. The left connection box 3 is connected to three wind turbines 27a-27c via respective submarine power cables 29a-29c, and is connected to another connection box 3 via a submarine power cable 29d. Thus, each of the submarine power cables 29a-29c has one end terminated at the respective wind turbine 27a-27c, and the other end within the termination box 6. The submarine power cable 29d has one end terminated at the termination box 6 of the leftmost connection box 3.

[0088] The submarine power cables 29a to 29c may be active submarine power cables, and the submarine power cable 29d may be a static submarine power cable or a passive submarine power cable.

[0089] The right connection box 3 is connected to two wind turbines 27n-1, 27n. This connection box 3 is further connected to the left connection box 3 directly or indirectly via a submarine power cable 29e. As a result, the submarine power cable 29e terminates in the termination box 6 of the rightmost connection box 3. This rightmost connection box 3 is connected to the offshore substation 31 by a submarine power cable 29f. Thus, one end of the submarine power cable 29f is terminated in the termination box 6 of the rightmost connection box 3. The other end of the submarine power cable 29f is terminated in the offshore substation 31.

[0090] If the connection box 3 is designed with more than four total first and second openings 7a, 7b, additional wind turbine connections may be made.

[0091] The inventive concept has been described above primarily with reference to certain examples, however, as will be readily appreciated by those skilled in the art, other embodiments than those disclosed above are equally possible within the scope of the inventive concept, as defined by the appended claims.

Claims

1. A submarine connection box (3) for connecting a system of submarine power cables (29a to 29f), wherein each of the submarine power cables (29a to 29f) includes at least one submarine power cable core (9, 15), and the submarine connection box (3) is Casing (5) and The terminal box (6) is located inside the casing (5), The terminal box (6) comprises L sets of connectors (23, 23-1, 23-2) arranged within the terminal box (6), where L is an integer equal to the number of electrical phases or poles of the submarine power cable system (29a to 29f), The casing (5) has N first openings (7a) configured to receive each of the N submarine power cables (29a, 29b) of a first set of N submarine power cables (29a, 29b), where N is an integer of 1 or more. The casing (5) has K second openings (7b) configured to receive each of the K submarine power cables (29c, 29d) of a second set, where K is an integer greater than 1. The terminal box (6) has a housing (4) that includes an opening for the first group and an opening for the second group. Each of the openings in the first group is configured to receive each submarine power cable core (9) of the first set of the N submarine power cables (29a, 29b), and each of the openings in the second group is configured to receive each submarine power cable core (15) of the second set of the K submarine power cables (29c, 29d), For each of the L sets, the connectors (23, 23-1, 23-2) are electrically interconnected with each other to connect the corresponding electrical phases or poles of the submarine power cable cores (9, 15) of the first set of the N submarine power cables (29a, 29b) and the second set of the K submarine power cables (29c, 29d) in a submarine connection box (3).

2. The connection box (3) according to claim 1, wherein N is 2 and K is 2.

3. The connection box (3) according to claim 1, wherein the connectors (23, 23-1, 23-2) are T-shaped.

4. The connection box (3) according to claim 3, wherein the stem (23a) of each T-shaped connector (23-1, 23-2) is a female connector configured to receive a submarine power cable core (9, 15).

5. The connection box (3) according to claim 4, wherein each female connector within the stem (23a) is provided with a stress cone (23d).

6. The connection box (3) according to claim 4, wherein each T-shaped connector (23-1, 23-2) comprises a cable lug (23e) extending from the stem (23a) to the arms (23b-1, 23c-1, 23b-2, 23c-2) and a contact bolt (23f) connected to the cable lug (23e).

7. The connection box (3) according to claim 3, wherein one of several arms (23b-2) of the T-shaped connector (23-2) is equipped with a male connector.

8. The connection box (3) according to claim 7, wherein one of several arms (23c-1) of the T-shaped connector (23-1) is a female connector connected to a male connector of one of the arms (23b-2) of another T-shaped connector (23-2).

9. The connection box (3) according to claim 3, wherein the N submarine power cables and the K submarine power cables are AC power cables and T-shaped connectors (23-1, 23-2) are arranged in three rows, or the N submarine power cables and the K submarine power cables are DC power cables and T-shaped connectors (23-1, 23-2) are arranged in two rows.

10. The connection box (3) according to claim 9, wherein each row comprises N+K T-shaped connectors (23-1, 23-2).

11. A connection box (3) according to any one of claims 1 to 10, The casing comprises N + K submarine power cables (29a to 29d), wherein N submarine power cables (29a, 29b) extend into the casing (5) through each of the N first openings (7a), and K submarine power cables (29c, 29d) extend into the casing (5) through each of the K second openings (7b). Submarine power cable assembly (1).

12. The submarine power cable assembly (1) according to claim 11, wherein the connection box (3) is the connection box according to claim 9, the N+K submarine power cables (29a to 29d) are AC power cables, and each of the three rows of T-shaped connectors (23-1, 23-2) is connected to a submarine power cable core (9, 15) of the same electrical phase, or the N+K submarine power cables (29a to 29d) are DC power cables, and each of the two rows of T-shaped connectors (23-1, 23-2) is connected to a submarine power cable core (9, 15) having the same polarity.

13. Multiple wind turbines (27a to 27n), Offshore substation (31), A submarine power cable assembly (1) according to one of the claims 11, comprising: For each connection box (3), the majority of the K+N submarine power cables (29a, 29b, 29c) connected to the connection box (3) are connected to their respective wind turbines (27a to 27c), and at least one of the N submarine power cables (29d) connected to the connection box (3) is connected to another connection box (3). One of the N submarine power cables (29f) connected to one of the connection boxes (3) is connected to the offshore substation (31). Offshore wind power plant (25).

14. The offshore wind power plant (25) according to claim 13, wherein for each connection box (3), each of the submarine power cables (29a to 29c) connected to the connection box and the wind turbine (27a to 27c) is a dynamic submarine power cable, and at least one of the N submarine power cables (29d) connected to the connection box is a static submarine power cable.

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