Rigid submarine power cable joint

Abstract

To provide a rigid submarine power cable joint for connecting a multicore DC dynamic submarine power cable to a static submarine power cable on the seabed.SOLUTION: A rigid submarine power cable joint 7 comprises an outer casing 7a. The outer casing 7a includes a first axial end face 7b and a second axial end face which is in an axial end of the outer casing 7a at an opposite side of the first axial end face 7b. The first axial end face 7b includes a single opening 7c in which a multicore dynamic submarine power cable is received, and the second axial end face includes two openings for receiving respective single-core submarine power cables.SELECTED DRAWING: Figure 3a

Description

[Technical field]

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

[0002] Offshore structures such as floating wind turbines are typically connected to dynamic submarine power cables for power transmission, which are designed to withstand stresses caused by wave motion.

[0003] The dynamic submarine power cable extends from the floating offshore structure to the seabed and may join with a static submarine power cable laid on the seabed. Summary of the Invention

[0004] In existing offshore installations, dynamic submarine power cables are generally AC power cables. However, there is growing interest in dynamic DC submarine power cables.

[0005] A dynamic DC submarine cable system suspended from an offshore structure to the seabed would need to include two dynamic DC submarine power cables, one for each pole. This would require two sets of buoyancy units, fixings, bending reinforcements, etc., one for each power cable. Furthermore, two dynamic DC submarine power cables would occupy a larger water column than a single dynamic AC submarine cable.

[0006] It would therefore be desirable to incorporate two DC cable cores into a single multi-core, preferably triple-core, dynamic submarine power cable. However, currently there are no connectors or joints on the market that are capable of connecting a multi-core DC dynamic submarine power cable to a static submarine power cable on the seabed.

[0007] A general object of the present disclosure is to provide a rigid submarine power cable joint that solves or at least mitigates problems in the prior art.

[0008] Thus, according to a first aspect of the present disclosure there is provided a rigid submarine power cable joint comprising an outer casing having a first axial end face and a second axial end face at an opposite axial end of the outer casing relative to the first axial end face, wherein the first axial end face comprises a single opening configured to receive a multi-core dynamic submarine power cable and the second axial end face comprises two openings each configured to receive a respective single-core submarine power cable.

[0009] Thus, a joint between a multi-core dynamic submarine power cable and two single-core submarine power cables can be achieved.

[0010] The single opening may have a circular cross-sectional shape.

[0011] Each of the two openings may have a circular cross-sectional shape.

[0012] The single opening is a through opening.

[0013] The two openings are through openings.

[0014] The single opening may be the only opening at the first axial end face configured to receive the multi-core dynamic submarine power cable. Thus, there is only one opening, i.e., a single opening, provided at the first axial end face configured to receive the multi-core dynamic submarine power cable.

[0015] The two openings may be the only openings configured to receive a respective single-core submarine power cable at the second axial end face. Thus, there are only two openings, i.e. two openings, provided at the second axial end face configured to receive a respective single-core submarine power cable.

[0016] According to one embodiment, the first axial end face includes a multi-core dynamic submarine power cable armor attachment structure disposed about the single opening and configured to attach armor wires of the multi-core dynamic submarine power cable.

[0017] The multi-core dynamic submarine power cable armor attachment structure may be, for example, a welding sleeve for welding the armor wire of the multi-core dynamic submarine power cable to the welding sleeve, so that the armor wire of the multi-core dynamic submarine power cable can be welded to the outer casing when it is terminated.

[0018] Alternatively, the multi-core dynamic submarine power cable armor attachment structure may be a clamping member, such as a clamping flange, for clamping armor wires of the multi-core dynamic submarine power cable to the outer casing.

[0019] According to one embodiment, the second axial end face comprises two single core submarine power cable armour attachment structures, each single core submarine power cable armour attachment structure disposed around a respective one of the two openings, each single core submarine power cable armour attachment structure configured to attach a respective one armour wire of the single core submarine power cables.

[0020] The two single-core submarine power cable armor attachment structures may be, for example, welding sleeves for welding the armor wires of the single-core submarine power cables to the respective welding sleeves, so that the armor wires of the single-core submarine power cables can be welded to the outer casing when they are terminated.

[0021] Alternatively, each of the two single-core submarine power cable armor attachment structures may be a clamp member, such as a clamp flange, for clamping the armor wires of the two single-core submarine power cables to the outer casing.

[0022] According to one embodiment, the second axial end face comprises a third opening configured to receive an armored submarine optical fiber cable, and the second axial end face comprises a submarine optical fiber armor attachment structure disposed about the third opening and configured to attach an armor wire of the armored submarine optical fiber cable.

[0023] The submarine optical fiber armor attachment structure may be, for example, a welding sleeve for welding the armor wire of the armored submarine optical fiber cable to the welding sleeve, so that the armor wire of the armored submarine optical fiber cable can be welded to the outer casing when they are terminated.

[0024] Alternatively, the submarine optical fiber armor attachment structure may be a clamping member, such as a clamping flange, for clamping the armor wires of an armored submarine optical fiber cable to the outer casing.

[0025] According to a second aspect of the present disclosure, there is provided a submarine power cable system, comprising: a rigid submarine power cable joint according to any of the preceding claims; and a multi-core dynamic submarine power cable comprising a first power core and a second power core, each of the first power core and the second power core comprising a respective conductor, a respective insulation system arranged around the conductor, and a respective metallic waterstop layer arranged around the insulation layer, the multi-core dynamic submarine power cable comprising a dynamic submarine power cable passing through a single opening; and a first static submarine power cable passing through a first of the two openings. and a second single core submarine power cable in the form of a second static submarine power cable passing through the second of the two openings, each of the first static submarine power cable and the second static submarine power cable comprising a respective conductor, a respective insulation system, and a respective metallic waterstop layer disposed about the insulation systems, the first power core being joined to the first static submarine power cable inside the outer casing, and the second power core being joined to the second static submarine power cable inside the outer casing.

[0026] According to one embodiment, a rigid submarine power cable joint comprises a first pre-fabricated joint connecting a first power core to a first static submarine power cable and a second pre-fabricated joint connecting a second power core to a second static submarine power cable.

[0027] One embodiment includes an elongated first inner case disposed around a first pre-fabricated joint, with a metallic waterstop layer of the first power core soldered or welded to a first end of the first inner case and a metallic waterstop layer of the first static submarine power cable soldered or welded to a second end of the first inner case.

[0028] One embodiment includes an elongated second inner case disposed around the second pre-fabricated joint, with a metallic waterstop layer of the second power core soldered or welded to a first end of the second inner case and a metallic waterstop layer of the second static submarine power cable soldered or welded to a second end of the second inner case.

[0029] According to one embodiment, the multi-core dynamic submarine power cable comprises an elongated element twisted with a first power core and a second power core, and the rigid submarine power cable joint comprises an end cap of the elongated element, and an end face of the elongated element is sealed inside the outer casing by the end cap of the elongated element.

[0030] According to one embodiment, the elongated element is a third power core comprising a conductor, an insulation system disposed around the conductor, and a metallic waterstop layer disposed around the insulation layer.

[0031] Alternatively, the elongated element may be constructed to have similar mechanical properties as the first and second power cores in terms of weight, size, and bending stiffness. For example, the weight of the elongated element may be within 90-100% of the weight of one of the first and second power cores, and the diameter of the elongated element may be within 90-100% of the diameter of one of the first and second power cores. For example, the bending stiffness of the elongated element may be within 90-100% of the bending stiffness of one of the first and second power cores. The first and second power cores generally have the same weight, diameter, and bending stiffness.

[0032] The first power core, the second power core, and the third power core may be twisted together. Thus, the multi-core dynamic submarine power cable may have a circular cross-sectional shape, which simplifies the handling of the multi-core dynamic submarine power cable during manufacturing, transportation, and installation.

[0033] The third power core can have an outer diameter that is the same or essentially the same as the outer diameters of the first and second power cores. For example, the outer diameter of the third power core can be within a range of 95-105% of the outer diameters of each of the first and second power cores.

[0034] The third power core may be a dummy power core identical to the first and second power cores, which is not electrically connected at both ends of the multi-core dynamic submarine power cable. The third power core thus provides symmetry to the multi-core dynamic submarine power cable in terms of its shape and topology / structure and therefore its mechanical behavior.

[0035] According to one embodiment, the multi-core dynamic submarine power cable, the first static submarine power cable, and the second static submarine power cable are DC power cables.

[0036] The multi-core dynamic submarine power cable, the first static submarine power cable, and the second static submarine power cable are DC power cables.

[0037] According to one embodiment, a multi-core dynamic submarine power cable comprises an armor wire attached to a multi-core dynamic submarine power cable armor attachment structure, a first static submarine power cable comprises an armor wire attached to one side of a single submarine power cable armor attachment structure, and a second static submarine power cable comprises an armor wire attached to the other side of the single submarine power cable armor attachment structure.

[0038] According to one embodiment, the submarine power cable system comprises an armored submarine fiber optic cable comprising armor wires attached to a submarine fiber optic armor attachment structure, the multi-core dynamic submarine power cable comprises an optical fiber cable, and the rigid submarine power cable joint comprises an optical fiber cable joint joining the optical fiber cable to the submarine fiber optic cable inside the outer casing.

[0039] According to one embodiment, the armored submarine optical fiber cable, the first static submarine power cable, and the second static submarine power cable are bound together along their extending lengths by a tape, cord, wire, or yarn.

[0040] One embodiment includes a first bend limiting portion connected to a first axial end face of the outer casing and extending around and along a portion of the multi-core dynamic submarine power cable outside the outer casing, and two second bend limiting portions each connected to a second axial end face of the outer casing and extending around and along a portion of a respective one of the first static submarine power cable and the second static submarine power cable outside the outer casing.

[0041] 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" and the like should be interpreted without limitation as referring to at least one instance of the element, apparatus, component, means, etc., unless otherwise specified.

[0042] 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]

[0043] [Figure 1] 1 illustrates a schematic diagram of an example of a submarine power cable system. [Diagram 2] 1 illustrates a schematic cross-section of an example multi-core dynamic submarine power cable. [Figure 3a] 1 shows a schematic diagram of an example of a perspective view of a rigid submarine power cable joint, showing one axial end thereof; [Figure 3b]3b shows a schematic perspective view of the rigid submarine power cable joint of FIG. 3a, showing its other axial end; [Figure 4] FIG. 2 shows a perspective view of a partially opened rigid submarine power cable joint. [Diagram 5] FIG. 1 is a side view of a submarine power cable system including a rigid submarine power cable joint. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] 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.

[0045] 1 illustrates generally an example of a submarine power cable system 1. The exemplary submarine power cable system 1 is a DC submarine power cable system.

[0046] The submarine power cable system 1 comprises a multi-core dynamic submarine power cable 3, a first single-core submarine power cable 5a in the form of a first static submarine power cable, a second single-core submarine power cable 5b in the form of a second static submarine power cable, and a rigid submarine power cable joint 7.

[0047] The multi-core dynamic submarine power cable 3 is a DC power cable, such as an HVDC power cable.

[0048] The first single-core submarine power cable 5a is a DC power cable, such as an HVDC power cable.

[0049] The second single-core submarine power cable 5b is a DC power cable, such as an HVDC power cable.

[0050] A rigid submarine power cable joint 7 connects the multi-core dynamic submarine power cable 3 to each of the first single-core submarine power cable 5a and the second single-core submarine power cable 5b.

[0051] The multi-core dynamic submarine power cable 3 extends between a floating platform 9 floating on the surface of a body of water 15 and the seabed 17 .

[0052] The floating platform 9 may be, for example, a floating wind turbine, a floating electrical substation, or a floating production storage and offloading unit.

[0053] The first single-core submarine power cable 5 a and the second single-core submarine power cable 5 b are laid on the seabed 17 .

[0054] The rigid submarine power cable joint 7 is disposed on the seabed 17 .

[0055] The submarine power cable system 1 may comprise an armored submarine optical fiber cable, which may be external to the first single-core submarine power cable 5a and the second single-core submarine power cable 5b along the length of the extension to the rigid submarine power cable joint 7 and bundled together with the first single-core submarine power cable 5a and the second single-core submarine power cable 5b by a tape, cord, wire or yarn.

[0056] The bending stiffeners 11 are connected to the floating platform 9. The multi-core dynamic subsea power cable 3 extends through the bending stiffeners 11 and terminates at the floating platform 9.

[0057] The submarine power cable system 1 may comprise one or more buoyancy units 13 connected to the multi-core dynamic submarine power cable 3 for providing underwater lift for the multi-core dynamic submarine power cable 3 .

[0058] The multi-core dynamic submarine power cable 3 comprises a first power core 19a and a second power core 19b.

[0059] The first power core 19a may be a first pole, and the second power core 19b may be a second pole.

[0060] The multi-core dynamic submarine power cable 3 can be used with bipolar operation provided by a first power core 19a and a second power core 19b.

[0061] The first power core 19a includes respective conductors, respective insulation systems disposed about the conductors, and respective metallic water blocking layers disposed about the insulation layers.

[0062] The insulation system may be polymer-based, including, for example, cross-linked polyethylene (XLPE), polypropylene (PP), thermoplastic elastomers (TPE) based on PP random copolymers, ethylene propylene diene monomer (EPDM) rubber, or ethylene propylene rubber (EPR).

[0063] The multi-core dynamic submarine power cable 3 comprises an elongated element 19c twisted with a first power core 19a and a second power core 19b. The elongated element 19c may have the same or essentially the same outer diameter as the first power core 19a and the second power core 19b.

[0064] According to one example, elongated element 19c is a third power core comprising a conductor, an insulation system disposed about the conductor, and a metallic water-stop layer disposed about the insulation layer. The insulation system of the third power core may be the same material as the first power core 19a and the second power core 19b.

[0065] The elongated element 19c may, according to one example, be identical to one or both of the first and second power cores 19a and 19b.

[0066] The multi-core dynamic submarine power cable 3 may include an optical fiber cable 21 .

[0067] The multi-core dynamic submarine power cable 3 may comprise filler profiles 22 each arranged between two adjacent power cores 19a, 19b and / or elongated elements 19c. The optical fiber cable 21 may be arranged in an opening of one of the filler profiles 22.

[0068] The multi-core dynamic submarine power cable 3 comprises an armor layer 23 disposed around the stranded first power core 19a, second power core 19b, and elongated elements 19c. The armor layer 23 comprises an armor wire helically wound around the first power core 19a, second power core 19b, and elongated elements 19c.

[0069] The armor wire may comprise a metal such as steel, for example galvanized steel or stainless steel.

[0070] The multi-core dynamic submarine power cable may alternatively comprise more than two armor layers, such as two, three or four armor layers.

[0071] Each of the first and second single-core submarine power cables 5a, 5b comprises a conductor, an insulation system surrounding the conductor, a metallic waterstop layer disposed around the insulation system, and an armor layer disposed around the metallic waterstop layer.

[0072] The insulation system of the first and second single-core submarine power cables 5a, 5b may be polymer-based, including for example XLPE, polypropylene PP, TPE based on PP random copolymer, EPDM rubber, or EPR.

[0073] FIG. 3 a shows an example of a rigid submarine power cable joint 7 .

[0074] The rigid submarine power cable joint 7 comprises an outer casing 7a. The outer casing 7a is made of metal, for example steel such as stainless steel.

[0075] The outer casing 7a may have an upper surface provided with a number of loops 8, each loop 8 being provided at a respective axial end of the outer casing 7a. The outer casing 7a may be moved up and down by a lifting device such as a crane by connecting respective hooks of a lifting device to the loops 8.

[0076] The outer casing 7a has a first axial end face 7b with a single opening 7c configured to receive the multi-core dynamic submarine power cable 3. The first power core 19a, the second power core 19b and the elongated element 19c all extend into the outer casing 7a through the single opening 7c.

[0077] The first axial end face 7b is provided with a multi-core dynamic submarine power cable armour attachment structure 7d arranged around the single opening 7c, which in this example is a welded sleeve having a longitudinal extension parallel to the longitudinal axis of the outer casing 7a.

[0078] Once splicing is complete, in the area where the multi-core dynamic submarine power cable 3 enters the outer casing 7a, the armor wire of the multi-core dynamic submarine power cable 3 is cut and the end is welded to the multi-core dynamic submarine power cable armor attachment structure 7d. If the multi-core dynamic submarine power cable armor attachment structure 7d is a clamping member such as a clamp flange, the armor wire is clamped between the flanges.

[0079] If the multi-core dynamic submarine power cable 3 comprises several armor layers, the multi-core dynamic submarine power cable sleeve 7d may be arranged in several radial stages or planes, each stage or plane configured to be welded to the armor wires of a respective armor layer.

[0080] Figure 3b shows the rigid submarine power cable joint 7 from its other axial end.

[0081] The outer casing 7a has a second axial end face 7e at an opposite axial end of the outer casing 7a to the first axial end face 7b.

[0082] The second axial end face 7e includes two openings 7f and 7g, each of which is configured to receive a respective one of the single-core submarine power cables 5a, 5b, i.e. the first and second static submarine power cables.

[0083] The second axial end face 7e is provided with two single-core submarine power cable armour attachment structures 7h, 7i, each of which is arranged around one of the two openings 7f, 7g, and each of which has a longitudinal extension parallel to the longitudinal axis of the outer casing 7a.

[0084] When the joining is completed, in the region where the first and second single-core submarine power cables 5a, 5b enter the outer casing 7a, the armor wires of the first and second single-core submarine power cables 5a, 5b are cut and the ends are welded to the single-core submarine power cable armor attachment structures 7h, 7i, respectively. If the single-core submarine power cable armor attachment structures 7h, 7i are clamping members such as clamp flanges, the armor wires are clamped between the flanges.

[0085] The second axial end face 7e may include a third opening 7j. The third opening 7j is a through opening. The third opening 7j may have a smaller cross-sectional area or size than the two openings 7f and 7g.

[0086] The third opening 7j is configured to receive an armored submarine optical fiber cable.

[0087] The third opening 7j may, for example, be located vertically above the two openings 7f and 7g.

[0088] The second axial end face 7e may comprise a submarine optical fiber armouring attachment structure 7k arranged around the third opening 7j, the submarine optical fiber armouring attachment structure 7k having a longitudinal extension parallel to the longitudinal axis of the outer casing 7a.

[0089] When the splicing is completed, the armor wire of the armored submarine optical fiber cable is cut in the area where the first and second single-core submarine power cables 5a, 5b and the ends are welded to the submarine optical fiber armor attachment structure 7k. If the submarine optical fiber armor attachment structure 7k is a clamping member such as a clamp flange, the armor wire is clamped between the flanges.

[0090] FIG. 4 shows a perspective view of a rigid submarine power cable joint 7 partially opened to expose its internal components.

[0091] The rigid submarine power cable joint 7 comprises a first pre-fabricated joint (not shown), alternatively called a pre-formed joint, which connects the first power core 19a with the first static submarine power cable 5a.

[0092] The rigid submarine power cable joint 7 comprises a second pre-fabricated joint (not shown), alternatively called a pre-formed joint, which connects the second power core 19b to the second static submarine power cable 5b.

[0093] The first pre-fabricated joint comprises an elastomeric sleeve connecting the insulation system of the first power core 19a and the first static submarine power cable 5a.

[0094] The second prefabricated joint comprises an elastomeric sleeve connecting the insulation system of the second power core 19b and the second static submarine power cable 5b.

[0095] The rigid submarine power cable joint 7 comprises an elongated first inner casing 25a arranged around a first pre-fabricated joint. The first inner casing 25a may be made of a metallic material such as steel, for example stainless steel.

[0096] The metallic water blocking layer of the first power core 19a is soldered or welded to the first end 29a of the first inner case 25a, thereby providing a watertight connection between the first power core 19a and the first inner case 25a.

[0097] The metallic waterstop layer of the first single-core submarine power cable 5a is soldered or welded to the second end of the first inner case 25a, thereby providing a waterproof connection between the first single-core submarine power cable 5a and the first inner case 25a.

[0098] The rigid submarine power cable joint 7 comprises an elongated second inner casing 25b arranged around the second prefabricated joint. The second inner casing 25b may be made of a metallic material such as steel, for example stainless steel.

[0099] The metallic water blocking layer of the second power core 19b is soldered or welded to the first end 29b of the second inner case 25b, thereby providing a watertight connection between the second power core 19b and the second inner case 25b.

[0100] The metallic waterstop layer of the second static submarine power cable 5b is soldered or welded to the second end of the second inner case 25b, thereby providing a waterproof connection between the second static submarine power cable 5b and the second inner case 25b.

[0101] The rigid submarine power cable joint 7 may comprise end caps (not shown) of the elongated elements which receive and seal the end faces of the elongated elements 19c inside the outer casing 7a, thereby sealing the elongated elements 19c from the ingress of water. The elongated elements 19c are therefore not electrically connected to any object inside the outer casing 7a. The elongated elements 19c may also not be electrically connected to any equipment on the floating platform 9.

[0102] The rigid submarine power cable joint 7 may comprise a fiber optic cable joint 27 which joins the fiber optic cable 21 with the submarine fiber optic cable inside the outer casing 7 .

[0103] Referring to FIG. 5 , the submarine power cable system 1 may include a number of bend limiting portions 29, 31 configured to limit bending of the cables 3, 5a, and 5b when the rigid submarine power cable joint 7 to which the cables 3, 5a, and 5b are connected is moved, for example when the rigid submarine power cable joint 7 is lowered to the seabed 17.

[0104] The bend limiting portions 29, 31 are connected to the outer casing 7a and extend around a portion of each of the cables 3, 5a, and 5b and are configured to limit the bending of the cables 3, 5a, and 5b in an area of ​​up to 5 meters or 10 meters from the outer casing 7a, for example in the extension direction of the cables 3, 5a, 5b from the outer casing 7a.

[0105] The first bend limiting portion 29 may be connected to a first axial end face 7b of the outer casing 7a. The first bend limiting portion 29 may extend around and along a portion of the multi-core dynamic submarine power cable 3 outside the outer casing 7a. Two second bend limiting portions, one of which is indicated with reference numeral 31, are connected to a second axial end face 7e of the outer casing 7a. Each second bend limiting portion may extend around and along a portion of each of the first and second static submarine power cables 5a, 5b outside the outer casing 7a.

[0106] 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 rigid submarine power cable joint (7) comprising an outer casing (7a) having a first axial end face (7b) and a second axial end face (7e) located at the axial end of the outer casing (7a) opposite to the first axial end face (7b), The first axial end face (7b) has a single opening (7c) configured to receive a multicore dynamic submarine power cable (3), A rigid submarine power cable joint (7) having a second axial end face (7e) comprising two openings (7f, 7g) respectively configured to receive the respective single-core submarine power cables (5a, 5b).

2. The rigid submarine power cable joint (7) according to claim 1, wherein the first axial end face (7b) is arranged around the single opening (7c) and comprises a multicore dynamic submarine power cable sheath attachment structure (7d) configured to attach the sheath wire of the multicore dynamic submarine power cable (3).

3. The rigid submarine power cable joint (7) according to claim 1 or 2, wherein the second axial end face (7e) comprises two single-core submarine power cable sheath attachment structures (7h, 7i), each single-core submarine power cable sheath attachment structure (7h, 7i) arranged around each of the two openings (7f, 7g), and each single-core submarine power cable sheath attachment structure (7h, 7i) is configured to attach the respective sheath wires of the single-core submarine power cables (5a, 5b).

4. The rigid submarine power cable joint (7) according to claim 1 or 2, wherein the second axial end face (7e) comprises a third opening (7j) configured to receive an outer submarine optical fiber cable, and the second axial end face (7e) comprises a submarine optical fiber sheathing attachment structure (7k) positioned around the third opening (7j) and configured to attach the outer wires of the outer submarine optical fiber cable.

5. Submarine power cable system (1), The rigid submarine power cable joint (7) described in claim 1, A multicore dynamic submarine power cable (3) comprising a first power core (19a) and a second power core (19b), wherein each of the first power core (19a) and the second power core (19b) comprises a conductor, an insulating system disposed around the conductor, and a metal watertight layer disposed around the insulating layer, the multicore dynamic submarine power cable (3) passing through a single opening (7c), A first single-core submarine power cable (5a) in the form of a first static submarine power cable that penetrates the first opening (7f) of the two openings, The system comprises a second single-core submarine power cable (5b) in the form of a second static submarine power cable that penetrates the second opening (7g) of the two openings, Each of the first static submarine power cable and the second static submarine power cable comprises a conductor, an insulation system, and a metal watertight layer arranged around the insulation system. Submarine power cable system (1), wherein the first power core (19a) is connected to the first static submarine power cable inside the outer casing (7a), and the second power core (19b) is connected to the second static submarine power cable inside the outer casing (7a).

6. The submarine power cable system (1) according to claim 5, wherein the rigid submarine power cable joint (7) comprises a first pre-fabricated joint for connecting the first power core (19a) to the first static submarine power cable, and a second pre-fabricated joint for connecting the second power core (19b) to the second static submarine power cable.

7. Submarine power cable system (1) according to claim 6, comprising an elongated first inner case (25a) positioned around the first pre-fabricated joint, wherein the metal watertight layer of the first power core (19a) is soldered or welded to the first end (29a) of the first inner case (25a), and the metal watertight layer of the first static submarine power cable is soldered or welded to the second end of the first inner case (25a).

8. The submarine power cable system according to claim 7, comprising an elongated second inner case (25b) positioned around the second pre-fabricated joint, wherein the metal watertight layer of the second power core (19b) is soldered or welded to the first end (29b) of the second inner case (25b), and the metal watertight layer of the second static submarine power cable is soldered or welded to the second end of the second inner case (25b).

9. The submarine power cable system according to claim 5, wherein the multicore dynamic submarine power cable (3) comprises an elongated element (19c) twisted with the first power core (19a) and the second power core (19b), the rigid submarine power cable joint (7) comprises an end cap for the elongated element, and the end face of the elongated element (19c) is sealed inside the outer casing (7a) by the end cap for the elongated element.

10. The submarine power cable system (1) according to claim 9, wherein the elongated element (19c) is a third power core comprising a conductor, an insulating system disposed around the conductor, and a metal watertight layer disposed around the insulating layer.

11. The submarine power cable system (1) according to claim 5, wherein the multi-core dynamic submarine power cable (3), the first static submarine power cable, and the second static submarine power cable are DC power cables.

12. The submarine power cable system (1) according to claim 5, wherein the rigid submarine power cable joint (7) is a rigid submarine power cable joint as described in claim 3, which is dependent on claim 2, the multicore dynamic submarine power cable (3) comprises an outer wire welded to the multicore dynamic submarine power cable outer attachment structure (7d), the first static submarine power cable comprises an outer wire attached to one of the single-core submarine power cable outer attachment structures (7h), and the second static submarine power cable comprises an outer wire attached to the other of the single-core submarine power cable outer attachment structure (7i).

13. The rigid submarine power cable joint (7) is as described in claim 4, the submarine power cable system (1) comprises an outer submarine optical fiber cable having an outer wire attached to the submarine optical fiber outer attachment structure (7k), the multicore dynamic submarine power cable (3) comprises an optical fiber cable (21), and the rigid submarine power cable joint (7) comprises an optical fiber cable joint (27) that connects the optical fiber cable (21) to the submarine optical fiber cable inside the outer casing (7a), the submarine power cable system (1) as described in claim 5.

14. The submarine power cable system (1) according to claim 13, wherein the outer-sea submarine optical fiber cable, the first static submarine power cable, and the second static submarine power cable are bundled together along the length of their extensions by tape, cord, wire, or yarn.

15. Submarine power cable system (1) according to claim 5, comprising: a first bending limiting portion (29) connected to the first axial end face (7b) of the outer casing (7a) and extending around a portion of the multicore dynamic submarine power cable (3) outside the outer casing (7a) and along the portion of the multicore dynamic submarine power cable (3); and two second bending limiting portions (31) each connected to the second axial end face (7e) of the outer casing (7a) and extending around a portion of the first static submarine power cable and the second static submarine power cable outside the outer casing (7a) and along a portion of the first static submarine power cable and the second static submarine power cable.

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