Superconducting cable assembly equipped with an electrical tap-off terminal

Abstract

The invention relates to a superconducting cable assembly (100) equipped with an electrical tap-off terminal (13), comprising a junction including an electrical junction (11) and an insulation junction (70) comprising an inner wall (7) and an outer wall (7') providing thermal insulation and defining a connection chamber (10) in which said electrical junction (11) is located. Said electrical tap-off terminal (13) is connected to said electrical junction (11) by an electrical link (12) passing through said insulation junction (70). The electrical link (12) comprises an internal conductive portion (14) located in the inner wall (7) of the insulation junction (70) and an external conductive portion (14') located in the outer wall (7') of the insulation junction (70).The inner conductive part (14) is connected to the electrical junction (11) and to the outer conductive part (14') by flexible electrical connection devices (15, 15'). Figure for the abbreviation: Figure 1.

Description

Title of the invention: Assembly of a superconducting cable equipped with an electrical tap-off terminal Technical field and technological background

[0001] The present invention relates to a superconducting cable assembly equipped with an electrical tap-off terminal and an electrical system comprising the assembly.

[0002] Superconducting cables make it possible to carry electric currents, especially high intensity currents, with much smaller cable cross-sections than conventional transport cables made of resistive electrical conductors, while limiting electrical losses along the cable, especially Joule effect losses, since this phenomenon is non-existent in the superconducting state.

[0003] Renewable energy sources, such as photovoltaic panels or wind turbines, and fuel cells, are attracting interest for a transition in energy production. However, the energy delivered per unit of power generation is relatively low. Therefore, operating a large number of such generators in conjunction with one another is being considered. To connect these numerous generators to an electrical grid, superconducting cables are considered efficient for transmitting the generated energy with high current and low electrical losses.

[0004] To collect the energy produced by several generators in a single superconducting cable, the latter must be equipped with several branch terminals, each of which must be connected to the resistive cable connected to a respective generator.

[0005] Patent application JP2001006837 is known to describe a superconducting cable branching structure in which the ends of two cable lengths are introduced at opposite ends of a vacuum chamber for an electrical connection between the two cable ends and an electrical branch. The branching structure is crimped onto the electrical connection between the two cable lengths, making it sensitive to variations in the size or position of the cable lengths, for example, due to a change in temperature or handling of the cable lengths.

[0006] There is therefore a need for a superconducting cable branching structure that allows for improved management of the thermo-mechanical stresses associated with the use of cryogenics. Summary of the invention

[0007] To this end, the invention proposes a superconducting cable assembly equipped with an electrical tap-off terminal, said assembly comprising a first cable length and a second cable length, each cable length coaxially comprising a superconducting element, a cryostat, a screen, an external enclosure defined by an inner wall and an outer wall and providing thermal insulation, said assembly further comprising a cable junction comprising: - an electrical junction making an electrical connection of the superconducting elements of the first cable length and the second cable length, - an insulation junction comprising an inner wall and an outer wall making thermal insulation, said insulation junction defining a connection chamber in which said electrical junction is located, said electrical branch terminal being located on an outer face of the insulation junction and being connected to said electrical junction by an electrical link passing through said insulation junction in a sealed manner; the electrical connection comprising an internal conductive part located in the inner wall of the insulation junction and an external conductive part located in the outer wall of the insulation junction, the internal conductive part being connected on one side to the electrical junction by a flexible electrical connection device extending through the connection chamber, and on the other side to the external conductive part by a flexible electrical connection device extending between the inner wall and the outer wall of the insulation junction.

[0008] Thanks to its architecture, the cable assembly according to the invention allows for a resilient branching of the superconducting cable at the junction between the two cable lengths. The flexible electrical connection devices allow for the absorption of variations in the size or position of the cable lengths.

[0009] According to one embodiment, the internal conductive part, respectively the external conductive part, of the electrical connection are in the form of a ring; the internal wall of the insulation joint, respectively the external wall of the insulation joint, comprising an electrically insulating part on either side of the ring.

[0010] According to one embodiment, the internal conductive part, respectively the external conductive part, of the electrical connection are in the form of a rod passing through the internal wall of the insulation joint, respectively the external wall of the insulation joint; the internal wall of the insulation joint, respectively the external wall of the insulation joint, comprise an electrically insulated penetration extending around the rod.

[0011] According to one method of implementation, the screens of In first cable length and In second cable length are electrically connected to Isolation Injunction.

[0012] According to one embodiment, the assembly comprises at least one secondary derivation terminal located on the external function of the isolation injunction and connected to the screen of the first cable length or to the screen of the second cable length by an electrical link passing in a sealed manner through said insulation junction.

[0013] According to one embodiment, the inner wall of the isolation junction connects the inner walls of the outer enclosures of the first and second cable lengths and the outer wall of the isolation junction connects the outer walls of the outer enclosures of the first and second cable lengths, so as to achieve a continuous connection between the outer enclosures of the first cable length and the second cable length.

[0014] According to one embodiment, the assembly comprises a plurality of first cable lengths and a plurality of second cable lengths connected respectively by the cable junction, the connection chamber of the insulation junction comprising a plurality of electrical junctions connecting respectively one of the plurality of first cable lengths with one of the plurality of second cable lengths.

[0015] According to one variant, each cable length has its own external enclosure, or the first cable lengths have a common external enclosure and the second cable lengths have a common external enclosure.

[0016] According to one embodiment, the cable junction comprises a cryostat having said connection chamber, said connection chamber being in fluidic connection with the cryostat of one of the first cable length and the second cable length, a sealed wall isolating said connection chamber from the cryostat of the other cable length, a first coolant interface port being located on one side of the sealed wall and passing through the isolation junction to open into the connection chamber, a second coolant interface port being located on the other side of the sealed wall and passing through the isolation junction for a fluidic connection with the cryostat of the other cable length.

[0017] The invention also relates to an electrical system comprising: - one or more superconducting cable assemblies equipped with a branch terminal according to one of the preceding claims, said cable assemblies being in series; - one or more electrical devices, respectively connected to a branch terminal of the superconducting cable assembly(ies), the said electrical device(s) being in particular one or more renewable energy sources. Brief description of the figures

[0018] The following description, with reference to the accompanying drawings, given by way of non-limiting examples, will clearly explain what the invention consists of and how it can be implemented. In the accompanying figures:

[0019] [Fig-1] represents a first example of a cable assembly equipped with a branch terminal;

[0020] [Fig.2] represents a second example of a cable assembly equipped with a terminal of derivation;

[0021] [Fig.3] represents a third example of a cable assembly equipped with a terminal of derivation;

[0022] [Fig.4] represents a fourth example of a cable assembly equipped with a terminal of derivation;

[0023] [Fig. 5] represents a fifth example of a cable assembly equipped with a terminal of derivation;

[0024] [Fig.6] represents a sixth example of a cable assembly equipped with a terminal of derivation;

[0025] [Fig.7] represents a seventh example of a cable assembly equipped with a terminal of derivation;

[0026] [Fig.8] represents an eighth example of a cable assembly equipped with a terminal of derivation;

[0027] [Fig.9] represents a ninth example of a cable assembly equipped with a terminal of derivation;

[0028] [Fig. 10] represents a ninth example of a cable assembly equipped with a branch terminal;

[0029] [Fig. 11] represents an eleventh example of a cable assembly equipped with a branch terminal;

[0030] [Fig. 12] represents an electrical system comprising an example of a cable assembly equipped with a branch terminal. Detailed description

[0031] A first example 100 of a superconducting cable assembly equipped with an electrical branch terminal 13 will be described in relation to [Fig.1].

[0032] The assembly 100 comprises a first cable length 1 and a second cable length 1. Each cable length 1 comprises coaxially a superconducting element 5, a cryostat 10', a screen 3, an external enclosure 20 defined by an inner wall 2 and an outer wall 2'. The external enclosure 20 provides thermal insulation.

[0033] The superconducting cable assembly 100 further comprises a cable junction which includes an electrical junction 11. The electrical junction 11 performs a electrical connection of the superconducting elements 5 of the first cable length 1 and the second cable length 1. The electrical junction 11 is for example in the form of a sleeve, in particular made of copper, in which the end of the superconducting element 5 of the first cable length 1 and the end of the superconducting element 5 of the second cable length 1 are fitted together, and in particular brazed with a tin alloy.

[0034] The assembly 100 also includes an insulating junction 70 which provides thermal insulation. The insulating junction 70 comprises an inner wall 7 and an outer wall 7' which define a connection chamber 10 in which the electrical junction 11 is located.

[0035] The electrical tap-off terminal 13 is located on an outer face of the insulation junction 70. It is connected to the electrical junction 11 by an electrical link 12 that passes through the insulation junction 70 in a sealed manner. The electrical tap-off terminal 13 allows current to be injected into the superconducting element 5 of the superconducting cable or current to be extracted from it, in particular from or to an electrical generator, notably a renewable energy source. The electrical tap-off terminal 13 and the electrical link 12 are preferably made of a material with good electrical conductivity, such as copper or aluminum, for example.

[0036] The electrical connection 12 comprises an internal conductive portion located in the inner wall 7 of the insulation joint 70, and an external conductive portion located in the outer wall 7' of the insulation joint 70. The internal conductive portion is connected on one side to the electrical joint 11 by an electrical connection device 15 extending through the connection chamber 10. On the other side, the internal conductive portion is connected to the external conductive portion by an electrical connection device 15' extending between the inner wall 7 and the outer wall 7' of the insulation joint 70. The electrical connection devices 15, 15' are flexible to ensure an electrical connection without mechanical or thermomechanical stress.For example, each electrical connection device 15, 15' is a flexible electrical conductor, including wire, copper mesh, conductive braid, spring contact strip device, or other.

[0037] In particular, the internal and external conductive parts of the electrical connection 12 are each surrounded within their respective walls 7, 7' by an electrically insulating part, and are preferably mechanically and hermetically fixed to them. The electrically insulating part is, for example, made of ceramic, epoxy resin, or other material.

[0038] In particular, the outer walls 2', 7' of the external enclosures 20 of the first cable length 1, of the second cable length 1 and of the isolation junction 70 have their outer face at ambient temperature.

[0039] In particular, the internal walls 2, 7 of the external enclosures 20 of the first cable length 1, of the second cable length 1 and of the isolation junction 70 have their inner face at the temperature of the cryogenic fluid used, for example of the order of -200°C for liquid nitrogen.

[0040] In particular, each length of cable 1 includes a layer of electrical insulation 4 between the superconducting element 5 and the screen 3.

[0041] In particular, each length of cable 1 includes a device 6 for managing the electric field. The device 6 prevents electrical breakdown between the screen 3, at ground potential, and the superconducting element 5 at the operating voltage of the system to which the superconducting cable assembly 100 is connected. For example, the device 6 has a conical shape and extends around the insulating layer 4 over a bare portion thereof, between the bare end of the superconducting element 5 and the end of the screen 3.

[0042] In particular, the inner wall 7 of the isolation junction 70 connects the inner walls 2 of the outer enclosures 20 of the first cable length 1 and the second cable length 1; and the outer wall 7' of the isolation junction 70 connects the outer walls 2' of the outer enclosures 20 of the first cable length 1 and the second cable length 1. The inner wall 7 and the outer wall 7' of the isolation junction 70 thus establish a continuous connection between the outer enclosures 20 of the first cable length 1 and the second cable length 1. By establishing a continuous connection between the outer enclosures of the first and second cable lengths, the isolation junction 70 makes it possible, for example, to prevent a break in the vacuum between the first and second cable lengths. The vacuum in these two cable lengths can then be obtained with a single device.

[0043] Alternatively, the external enclosures 20 of the first cable length 1 and of the second cable length 1 are each closed at their respective ends.

[0044] The first example 100 is according to a first embodiment in which the inner conductive portion 14 of the electrical connection 12 is ring-shaped. The inner wall 7 of the insulating junction 70 comprises an electrically insulating portion 8 on either side of the ring 14. The outer conductive portion 14' of the electrical connection 12 is ring-shaped. The outer wall 7' of the insulating junction 70 comprises an electrically insulating portion 9 on either side of the ring 14'. The electrically insulating portions 8, 9 can be relatively long to increase the electrical insulation between an electrical potential of the branch terminal 13 and an electrical potential to which the remainder of their respective walls 7, 7' is connected. Thus, the first embodiment is particularly suitable for high-voltage applications. Annular joints can be used around Each ring is designed to ensure a seal with the insulating parts. However, in the invention, the electrical connection 12 could be different, particularly as in a second embodiment described later.

[0045] In particular, the electrical branch terminal 13 is integral with the external conductive part 14'. In particular, the branch terminal 13 extends from an angular portion of the ring-shaped external conductive part 14'.

[0046] In particular, the first example 100 is according to a third embodiment in which the screens 3 of the first cable length 1 and the second cable length 1 are electrically connected to the insulation junction 70. Specifically, the electrical connection is made by a ring 16 extending around and connected to the screen 3, and an electrical conductor 15” connecting the ring 16 to the inner wall 7 of the insulation junction 70. The electrical conductor 15” is preferably a flexible conductor such as a wire, a conductive braid, or a contact spring device. Such an electrical connection makes it possible to bring the screen 3 to the same electrical potential as the inner wall 7 of the insulation junction 70. The inner wall 7 of the insulation junction 70 can also be connected to an electrical ground.In particular, thanks to the electrically insulating parts 8, 9, the grounding can be different between the first cable length 1 and the second cable length 1. However, the electrical connection between the screens 3 of the two cable lengths 1 and the insulation junction 70 could be different. Alternatively, the cable assembly according to the invention could be devoid of an electrical connection between the screen 3 and the electrical insulation junction 70, in particular between the part of the screen 3 included in the cable junction and the insulation junction 70.

[0047] Figure 2 illustrates a second example 200 of a superconducting cable assembly equipped with an electrical tap-off terminal 13. The second example 200 of the cable assembly is identical to the first example 100, except that it is according to a second embodiment in which the internal conductive portion 19 of the electrical connection 12 is rod-shaped and passes through the internal wall 7 of the insulating junction 70. The internal wall 7 of the insulating junction 70 includes an electrically insulating portion 18 that extends around the rod. Furthermore, the external conductive portion 19' of the electrical connection 12 is rod-shaped and passes through the external wall 7' of the insulating junction 70. The external wall 7' of the insulating junction 70 includes an electrically insulating portion 18' that extends around the rod. In particular, the electrical branch terminal 13 is a single piece with the external conductive part 19'.

[0048] Figure 3 illustrates a third example 300 of a superconducting cable assembly equipped with an electrical tap-off terminal 13. The third example 300 of a cable assembly is identical to the first example 100, except that it is according to a fourth An embodiment comprising at least one secondary branch terminal 33 located on the outer face of the insulation junction 70. One secondary branch terminal 33 is connected to the screen 3 of the first cable length 1 by an electrical connection 32 that passes through the insulation junction 70 in a sealed manner. Similarly, another secondary branch terminal 33 is connected to the screen 3 of the second cable length 1. The secondary branch terminal 33 allows current to be injected into or extracted from the screen 3 of the cable length, for example, for a connection to an electrical ground. The electrical connection 32 is otherwise identical to the electrical connection 12 of the branch terminal 13 described previously, referred to by contrast as the "main branch terminal".

[0049] The third example 300 is further according to the first embodiment, the electrical connections 12, 32 of the main branch terminal 13 and the secondary branch terminal 33 being identical. Generally, the branch terminal 13, 33 can be located at an angular position of the external ring-shaped conductive part 14' that differs from the angular position of the electrical connection 12, 32. This is notably the case in a fourth example 400 illustrated in [Fig. 4], which is otherwise identical to the third example 300.

[0050] In particular, the secondary branch terminals 33 can be electrically connected to each other, for example by an electrical conductor 35. In particular, the electrical conductor 35 extends outside the insulation junction 70, between the secondary branch terminals 33. However, the electrical connection between the secondary branch terminals 33 could be made otherwise, for example by a conductor extending inside the connection chamber 10, between the internal conductive parts 14 of the electrical connections 32 of the secondary branch terminals 33. In particular, the electrical connection between the secondary branch terminals 33 makes it possible to have the same earth connection between the two lengths of superconducting cable 1.

[0051] Fig. 5 illustrates a fifth example 500 of a superconducting cable assembly equipped with an electrical branch terminal 13. The fifth example 500 of a cable assembly is identical to the third example 300, except that it is according to the second embodiment, the electrical connections 12, 32 being identical.

[0052] In particular, the branch terminals 13, 33 may or may not be aligned with each other.

[0053] Figure 6 illustrates a sixth example 600 of a superconducting cable assembly according to a fifth embodiment comprising several first cable lengths 1 (in particular located on the left in Figure 6) and several second cable lengths 1 (in particular located on the right in Figure 6) connected respectively by the cable junction. The connection chamber 10 of the insulation junction 70 comprises several electrical junctions 11 respectively connecting one of the first cable lengths 1 with one of the second cable lengths 1.

[0054] The fifth embodiment is compatible with the embodiments described above. In particular, the sixth example 600 is further defined according to the first embodiment. Figure 7 illustrates a seventh example 700 of a superconducting cable assembly according to the fifth embodiment. In particular, the seventh example 700 is further defined according to the second embodiment. The seventh example 700, as well as the sixth example 600, may include secondary branch terminals 33 according to the fourth embodiment.

[0055] In particular, the sixth example 600 and the seventh example 700 are according to a first variant of the fifth embodiment, in which each cable length 1 has its own external enclosure 20.

[0056] Figure 8 illustrates an eighth example 800 of a cable assembly according to a second variant of the fifth embodiment, in which the first cable lengths 1 have a common outer casing 20 and the second cable lengths 1 have a common outer casing 20. The eighth example 800 of a cable assembly is otherwise identical to the seventh example 700.

[0057] Figure 9 illustrates a ninth example 900 of a cable assembly according to the second variant of the fifth embodiment, in which the first cable lengths 1 have a common outer casing 20 and the second cable lengths 1 have a common outer casing 20. The ninth example 900 of a cable assembly is otherwise identical to the sixth example 600.

[0058] In particular, in the two variants of the fifth embodiment, the inner walls 2 of the outer enclosures 20 of the cable lengths 1 are connected to the inner wall 7 of the isolation junction 70; and the outer walls 7' of the outer enclosures 20 of the cable lengths 1 are connected to the outer wall 7' of the isolation junction 70.

[0059] Figure 10 illustrates a tenth example 1000 according to a sixth embodiment in which the first cable length 1 and the second cable length 1 each contain several coaxial superconducting elements 5. In particular, each superconducting element 5 corresponds to a phase of a polyphase electrical signal carried by the cable. Alternatively, a first superconducting element 5 of the cable length 1 corresponds to a negative potential of a direct current electrical signal; a second superconducting element 5 of the cable length 1 corresponds to a positive potential of a direct current electrical signal. The central superconducting elements 5 of the first and second cable lengths 1 are connected to each other directly by the electrical junction 11 linking them. The peripheral superconducting elements 5 are connected to each other via their respective branch terminals 13, in particular by an electrical conductor 35. In particular, the electrical conductor 35 extends outside the insulation junction 70 between the branch terminals 13. However, the electrical connection between the branch terminals 13 could be made otherwise, for example by a conductor extending inside the connection chamber 10, between the internal conductive parts 14 of the electrical links 12 of the branch terminals 13.

[0060] The sixth embodiment is compatible with the embodiments described above. In particular, the tenth example 1000 is further defined according to the first and third embodiments.

[0061] Figure 11 illustrates an eleventh example 1010 according to a seventh embodiment compatible with the others. The connection chamber 10 of the isolation junction 70 forms, at least in part, a cryostat configured to receive a cooling fluid. The connection chamber 10 is in fluidic connection with the cryostat 10' of the first cable length 1, located, in particular, on the left in Figure 11. A sealed wall 22 isolates the connection chamber 10 from the cryostat 10' of the other cable length. A first interface port 21 for the cooling fluid is located on one side of the sealed wall 22. The first interface port 21 passes through the insulation junction 70 to open into the connection chamber 10. A second interface port 21 for the cooling fluid is located on the other side of the sealed wall 22. The second interface port 21 passes through the insulation junction 70 to be in fluidic contact with the cryostat 10' of the other length of cable.

[0062] In particular, the interface ports 21 are located on the outer face of the insulation junction 70. For example, the first interface port 21 and the second interface port 21 form a coolant inlet and a coolant outlet, respectively, or vice versa. In particular, the coolant circulates in a closed loop, from the first interface port 21 to the first cable length 1 (located in particular on the left in [Fig. 11]), and then returns via the second cable length 1 (located in particular on the right in [Fig. 11]) to the second interface port 21. For example, the coolant exits through one of the interface ports 21, is cooled and pressurized in a cooling system, and then reinjected through the other interface port 21.This is particularly useful for managing systems over long lengths where pressure losses and temperature increases in the cryogenic fluid can occur.

[0063] Figure 12 illustrates an electrical system S comprising an example of a superconducting cable assembly equipped with a tap-off terminal 13. Electrical equipment 24 is connected to the tap-off terminal 13 of the superconducting cable assembly for current exchange with the cable assembly. The cable assembly can further be connected to terminations 23 at its ends. In particular, the terminations 23 establish a connection with a conventional electrical network operating at ambient temperature. Electrical equipment 24 is, for example, a renewable energy source, such as a photovoltaic panel or farm, or a wind turbine or wind farm. Electrical equipment 24 can also be an electrical consumer powered by the superconducting cable, such as a data center. The electrical system S can include any of the cable assembly examples described above.

Claims

Demands

1. A superconducting cable assembly (100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1010) equipped with an electrical tap-off terminal (13), said assembly comprising a first cable length (1) and a second cable length (1), each cable length (1) coaxially comprising a superconducting element (5), a cryostat (10'), a screen (3), and an external enclosure (20) defined by an inner wall (2) and an outer wall (2') and providing thermal insulation, said assembly further comprising a cable junction comprising: - an electrical junction (11) providing an electrical connection between the superconducting elements (5) of the first cable length (1) and the second cable length (1), - an insulation junction (70) comprising an inner wall (7) and an outer wall (7') providing insulation thermal,said insulation junction (70) defining a connection chamber (10) in which said electrical junction (11) is located, said electrical branch terminal (13) being located on an outer face of the insulation junction (70) and being connected to said electrical junction (11) by an electrical link (12) passing through said insulation junction (70) in a sealed manner; the electrical link (12) comprising an internal conductive portion (14) located in the inner wall (7) of the insulation junction (70) and an external conductive portion (14') located in the outer wall (7') of the insulation junction (70), the internal conductive portion (14) being connected on one side to the electrical junction (11) by a flexible electrical connection device (15) extending through the connection chamber (10),and on the other hand to the external conductive part (14') by means of a flexible electrical connection device (15') extending between the inner wall (7) and the outer wall (7') of the insulation junction (70).

2. Assembly (100, 300, 400, 600, 900, 1000, 1010) according to claim 1, wherein the inner conductive part (14), respectively the outer conductive part (14'), of the electrical connection (12) are ring-shaped; the inner wall (7) of the insulation junction (70), respectively the outer wall (7') of the insulation junction (70), comprising an electrically insulating part (8, 9) on either side of the ring.

3. Assembly (200, 500, 700, 800) according to claim 1, wherein the inner conductive part (14), respectively the outer conductive part (14'), of the electrical link (12) are in the form of a rod passing through the inner wall (7) of the insulation junction (70), respectively the outer wall (7') of the insulation junction (70); the inner wall (7) of the insulation junction (70), respectively the outer wall (7') of the insulation junction (70), comprising an electrically insulating part (18, 18') extending around the rod.

4. Assembly (100, 200, 600, 900, 1000, 1010) according to any one of the preceding claims, wherein the screens (3) of the first cable length (1) and the second cable length (1) are electrically connected to the insulation junction (70).

5. Assembly (300, 400, 500, 700, 800) according to any one of claims 1 to 3, comprising at least one secondary branch terminal (33) located on the outer face of the insulation junction (70) and connected to the screen (3) of the first cable length (1) or to the screen (3) of the second cable length (1) by an electrical link (32) passing through said insulation junction (70) in a sealed manner.

6. Assembly (100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1010) according to any one of the preceding claims, wherein the inner wall (7) of the Isolation Injunction (70) connects the inner walls (2) of the outer enclosures (20) of the first and second cable lengths (1) and the outer wall (7') of the Isolation Junction (70) connects the outer walls (2') of the outer enclosures (20) of the first and second cable lengths (1), so as to achieve a continuous connection between the outer enclosures (20) of the first cable length (1) and the second cable length (1).

7. Assembly (600, 700, 800, 900) according to any one of the preceding claims, comprising a plurality of first cable lengths (1) and a plurality of second cable lengths (1) connected respectively by the cable junction, the connection chamber (10) of the Isolation Injunction (70) comprising a plurality of electrical junctions (11) connecting respectively one of the plurality of first cable lengths (1) with one of the plurality of second cable lengths (1).

8. Assembly (600, 700, 800, 900) according to the preceding claim, wherein each cable length (1) has its own external enclosure (20), or the first cable lengths (1) have a common external enclosure (20) and the second cable lengths (1) have a common external enclosure (20).

9. Assembly (1010) according to any one of the preceding claims, wherein the cable junction comprises a cryostat having said connection chamber (10), said connection chamber (10) being in fluidic connection with the cryostat (10') by one of the first cable lengths (1) and the second cable lengths (1), a sealed wall (22) isolating said connection chamber (10) from the cryostat (10') by the other cable length (1), a first interface port (21) for coolant being located on one side of the sealed wall (22) and passing through the isolation injunction (70) to open into the connection chamber (10), a second interface port (21) for coolant being located on the other side of the sealed wall (22) and passing through the isolation injunction (70) for fluidic connection with the cryostat (10') by the other cable length (1).

10. Electrical system (S) comprising: - one or more superconducting cable assemblies provided with a tap-off terminal (13) according to any one of the preceding claims, said cable assemblies being in series; - one or more electrical equipment (24), respectively connected to a tap-off terminal of the superconducting cable assemblies, said electrical equipment (24) being in particular one or more renewable energy sources.

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