Cable module, gas-insulated equipment, and method for manufacturing a cable module

Abstract

The present disclosure relates to a cable module having a removable break feature, a gas-insulated equipment including the cable module, and a method for manufacturing the cable module. The cable module for high-voltage gas-insulated equipment having a removable electrical connection includes an enclosure (1) provided with a first opening (11) and a second opening (12), an insulator (2) provided with a conductive insert (21) and fixed to a first flange (13) of the enclosure (1) around the first opening (11), a cable terminal connector (4) penetrating a wall of the enclosure (1) and having a first end (41) positioned inside the enclosure (1) and a second end (42) positioned outside the enclosure (1) and configured to be connected to an external cable, a first conductor (31) electrically connected to the conductive insert (21), a second conductor (32) electrically connected to the first end (41) of the cable terminal connector (4), and a second conductor (32) electrically connected to the first end (41) of the cable terminal connector (4). ), and a third conductor (33) that detachably and electrically connects the first conductor (31) to the second conductor (32), and a fourth conductor (34) fixedly connected to the first end (41) of the cable terminal connector (4), wherein the third conductor (33) is configured to be movable relative to the enclosure (1) substantially along a central axis (A2) of the second opening (12) and is configured to be fixedly connected to or separated from the first conductor (31), and the second conductor (32) is configured to be movable relative to the fourth conductor (34) along a direction perpendicular to the central axis (A2) of the second opening (12), and is electrically connected to the fourth conductor (34) via a second electrical contact (62) embedded in the fourth conductor (34).

Description

Technical Field

[0001] Technical Field The present disclosure relates to the technical field of high-voltage power transmission. Specifically, the present disclosure relates to a cable module having a detachable electrical connection part, a gas-insulated device including the cable module, and a method for manufacturing the cable module.

Background Art

[0002] Background Gas-insulated devices such as gas-insulated switchgears (GIS) and gas-insulated transmission lines (GIL) are widely used in the field of high-voltage power transmission technology. More specifically, a gas-insulated switchgear (GIS) may be regarded as a kind of compact metal-enclosed switchgear composed of a plurality of high-voltage functional modules such as a cable module, a circuit breaker module, and a circuit breaker module. Among these functional modules, a cable module (also referred to as a "cable terminal module") may be regarded as a common area where an external cable (also referred to as a "client cable") having a corresponding cable terminal connector interface interfaces with other functional modules of the GIS.

[0003] Currently, in order to be able to temporarily electrically insulate an external cable from the GIS so that the functional integrity of the GIS itself can be independently verified on-site for the client after the assembly of the cable module, the cable module requires a detachable electrical connection part. However, a cable module having a detachable electrical connection part requires particularly many auxiliary components and usually has a very complex and difficult implementation because the size of the cable module increases.

[0004] For example, FIG. 1 is a schematic cross-sectional view of a cable module having a detachable electrical connection portion in the prior art. As shown in FIG. 1, the cable module includes an enclosure 100 having a first opening 101 and a second opening 102, an insulator 200, and a twisted conductor 300 electrically connected to a conductive insert disposed within the insulator 200, wherein an assembly of the insulator 200 and the twisted conductor 300 is fixed to the enclosure 100 by an adapter 103 attached to a flange of the enclosure 100 around the first opening 101, the insulator 200 and the twisted conductor 300, a cover 104 attached to a flange of the enclosure 100 around the second opening 102, and a cable terminal connector 400 that enters the interior of the enclosure 100 through a wall of the enclosure 100, and a first end 401 thereof is detachably and electrically connected to the twisted conductor 300 inside the enclosure 100 to form a detachable break structure, and a second end 402 thereof is adapted to be connected to an external cable outside the enclosure 100.

[0005] The disadvantages of the above-described technical solutions in the prior art are that in such a cable module, due to the number of components and the complex structure, the material cost and labor cost are high, and the detachable break structure is difficult to assemble or disassemble on site. More specifically, when it is necessary to separate the twisted conductor 300 from the cable terminal connector 400, in order to perform the disassembly operation, it is necessary to remove the cover 104 from the enclosure 100 and insert a tool into the enclosure 100 from the second opening 102. However, the central axis of the second opening 102 is not aligned with the connection interface between the twisted conductor 300 and the first end 401 of the cable terminal connector 400. Furthermore, the twisted conductor 300 and the cable terminal connector 400 are connected or separated along a direction perpendicular to the insertion direction of the tool, and all of these increase the difficulty of disassembling and assembling the detachable break structure on site.

[0006] Furthermore, due to the size of the twisted conductor 300, the outer shape of the assembly of the insulator 200 and the twisted conductor 300 exceeds the area defined by the contour of the flange hole 105 of the adapter 103 for fixing the insulator 200. Therefore, it can be seen that such an adapter 103 must be used so that the insulator 200, the twisted conductor 300, and such an adapter 103 are first assembled with each other before being attached to the enclosure 100. Thus, since the adapter 103 is not integrally formed with the enclosure 100 but is an auxiliary component independent of the enclosure 100, not only does the number of components increase, but also the labor cost increases.

[0007] Chinese Patent Application Publication No. 105846336 describes a direct connection module and a switching device including the same. The direct connection module includes a tubular shell having two axial openings and a radial opening, an oil gas casing with one end extending into the shell and the other end fixedly connected to one of the two axial openings, an insulator fixedly connected to the radial opening, a radial conductor disposed in the shell with one end fixedly connected to the insulator, an axial conductor disposed in the shell with one end fixedly connected to the oil gas casing and the other end connected to the other end of the radial conductor, and a flexible connection portion provided.

[0008] Japanese Patent Laid-Open No. 59155811 describes a gas-insulated switching device including a circuit, a connection conductor disposed in a substantially straight portion of the circuit in the device and detachable in a direction substantially perpendicular to the axis of the circuit, and an external connection terminal for connecting to the outside, and a cable terminal device having an opening in a gutter portion facing the protruding direction of the external connection terminal. The gas-insulated equipment and the cable are connected to each other in the tank of the cable terminal device.

[0009] German Patent Application Publication No. 202014003281 describes a complete set for assembling single-phase or three-phase terminal cable equipment. The terminal cable equipment is intended to connect a distributor to a high-voltage cable. The complete set includes a basic jacket, an attenuator for the jacket, and a lower closing element. One or three tips of the connection to the cable have a jacket. The attenuator for the jacket is open on both sides and is intended to be fastened to the open end of the basic jacket. The lower closing element is intended to be selectively fixed to the open end of the basic jacket or the attenuator for the jacket, and one or three passage openings are achieved therein.

[0010] European Patent Application Publication No. 3276763 describes a cable box between a gas-insulated switchgear (GIS) and a high-voltage electrical cable. The cable box has a cable box enclosure, a GIS terminal of the GIS, a cable end of the electrical cable, and a conductor bar for connecting the cable end to the GIS terminal. The conductor bar is movably provided within the cable box enclosure such that it can move between a first position connecting the cable end to the GIS terminal and a second position connecting the cable end to the cable box enclosure.

[0011] International Publication No. 2016 / 000931 describes, among other things, a cable termination having three insulated cable connection elements protruding into a housing and having internal conductors, and three mating connection parts designed as hollow bodies and similarly protruding into the housing from the side located opposite the cable connection elements and each capable of inserting one of three cable end reinforcements. Each of the cable connection elements and the mating connection parts forms a corner of a triangle. These triangles are rotated relative to each other within their respective planes such that an offset is generated. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0012] Overview The present invention is defined by the features of the independent claims.

[0013] In view of the above, an object of the present disclosure is to provide a cable module having a detachable electrical connection that enables quick, safe, and convenient disassembly and assembly of its detachable break structure, thereby significantly reducing working time and labor costs.

Means for Solving the Problem

[0014] For this purpose, a first aspect of the present disclosure includes an enclosure provided with a first opening and a second opening, an insulator provided with a conductive insert and fixed to a first flange of the enclosure around the first opening, a cable terminal connector passing through the wall of the enclosure and having a first end positioned inside the enclosure and a second end positioned outside the enclosure and configured to be connected to an external cable, and a plurality of conductors including a first conductor electrically connected to the conductive insert, a second conductor electrically connected to the first end of the cable terminal connector, and a third conductor detachably and electrically connecting the first conductor to the second conductor, wherein the third conductor is configured to be movable relative to the enclosure substantially along the central axis of the second opening and is fixedly connected to or separated from the first conductor, and provides a cable module having a detachable electrical connection.

[0015] Accordingly, since the movable direction of the third conductor substantially coincides with the moving direction of a tool inserted from the second opening, both the disassembly and assembly operations of the detachable break structure are very simple, thereby significantly saving on-site working time and labor costs.

[0016] According to a preferred form of the present disclosure, the third conductor is detachably connected to the first conductor via a bolt, and the central axis of the bolt coincides with the central axis of the second opening.

[0017] According to a preferred embodiment of the present disclosure, the third conductor is configured to be movable relative to the second conductor along the central axis of the second opening, and is electrically connected to the fourth conductor via a first electrical contact embedded in the second conductor.

[0018] According to a preferred embodiment of the present disclosure, the second conductor is provided with a passage that penetrates the entire second conductor along the central axis of the second opening, and the third conductor is configured to be movable within the passage in which the first electrical contact is embedded.

[0019] According to a preferred embodiment of the present disclosure, the cable module further includes a fourth conductor fixedly connected to the first end of the cable terminal connector, the second conductor is configured to be movable relative to the fourth conductor along a direction perpendicular to the central axis of the second opening, and is electrically connected to the second conductor via a second electrical contact embedded in the fourth conductor.

[0020] According to a preferred embodiment of the present disclosure, the central axis of the first opening is perpendicular to the central axis of the second opening.

[0021] According to a preferred embodiment of the present disclosure, the outer shape of the first conductor does not exceed the region defined by the outer shape of the first opening in a cross-section perpendicular to the central axis of the first opening.

[0022] According to a preferred embodiment of the present disclosure, the cable module is integrated with a high-voltage detection sensor and further includes a first cover fixed to the second flange of the enclosure around the second opening.

[0023] According to a preferred embodiment of the present disclosure, the enclosure is further provided with a third opening, the cable module is integrated with an explosion-proof film, and further includes a second cover fixed to the third flange of the enclosure around the third opening.

[0024] A second aspect of the present disclosure provides a gas-insulated apparatus such as a GIS or a GIL, comprising a cable module having a detachable electrical connection according to the first aspect of the present disclosure.

[0025] A third aspect of the present disclosure is a method for manufacturing a cable having a detachable electrical connection, the method comprising: providing an enclosure having a first opening and a second opening; providing an insulator having a conductive insert; providing a first conductor electrically connected to the conductive insert and fixing an assembly of the insulator and the first conductor to a first flange of the enclosure around the first opening; providing a cable terminal connector having a first end and a second end; providing a second conductor electrically connected to the first end of the cable terminal connector and passing an assembly of the cable terminal connector and the second conductor through a wall of the enclosure such that the first end is positioned inside the enclosure and the second end is positioned outside the enclosure and connected to an external cable; and providing a third conductor for detachably and electrically connecting the first conductor to the second conductor, the third conductor being configured to be movable relative to the enclosure substantially along a central axis of the second opening and being fixedly connected to or separated from the first conductor.

[0026] According to a preferred embodiment of the present disclosure, the connection or separation of the first conductor and the third conductor is performed by inserting a tool into the enclosure from the second opening along the central axis of the second opening.

[0027] The cable module having a detachable electrical connection according to the present disclosure has a relatively simple structure that is easy to manufacture and has low material costs, and thus can be widely used in various gas-insulated apparatuses.

[0028] In general, all terms used in the claims should be construed in accordance with their ordinary meaning in the technical field, unless specifically defined otherwise in this specification. All references to "an element, apparatus, component, means, step, etc." should be construed broadly as referring to at least one example of the element, apparatus, component, means, step, etc., unless specifically stated otherwise.

[0029] Brief Description of the Drawings Other features and advantages of the present disclosure will be better understood from the following preferred embodiments, which are described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar components.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0031] Note that the drawings are used not only for the description and illustration of the present disclosure, but also for the definition of the present disclosure as needed.

[0032] Detailed Description The implementation and use of the embodiments will be described in detail below. However, it should be understood that the specific embodiments described are merely intended to illustrate specific ways of implementing and using the present disclosure and are not intended to limit the protection scope of the present disclosure.

[0033] As used herein, the "cable module" refers to a type of high-voltage functional module that constitutes a part of gas-insulated equipment such as gas-insulated switchgear (GIS) and gas-insulated transmission lines (GIL), and it should be noted that the external cable is regarded as a common area where it interfaces with other functional modules of the gas-insulated equipment.

[0034] Furthermore, it should be noted that the cable module shown in the figure is a three-phase cable module that constitutes a part of three-phase gas-insulated equipment. That is, the cable module according to the illustrated embodiment is evenly distributed along the circumferential direction and includes three cable terminal connectors configured to be respectively connected to three conductive inserts arranged on the insulator and three external cables. Therefore, the detachable electrical connection part of the cable module described below may be applied to the detachable electrical connection part between any one of the three cable terminal connectors and the corresponding conductive insert.

[0035] Technical terms indicating directional relationships in this specification should not be understood as an absolute concept. For example, terms such as "parallel to", "perpendicular to", "coincident with", and "along (a direction)" should be understood as "substantially parallel to", "substantially perpendicular to", "substantially coincident with", and "substantially along (a direction)", respectively.

[0036] Figures 2 to 6 show preferred embodiments of a cable module having a detachable electrical connection according to the present disclosure. As shown in the figures, the cable module according to the present disclosure mainly includes an enclosure 1, an insulator 2, a cable terminal connector 4, and a plurality of conductors 31, 32, 33.

[0037] The enclosure 1 has a substantially cylindrical shape and is provided with a first opening 11 for attaching the insulator 2 and a second opening 12 used as a tool hole. Preferably, according to the illustrated embodiment, the central axis A1 of the first opening 11 is perpendicular to the central axis A2 of the second opening 12. The insulator 2 is a pot-shaped insulator provided with a conductive insert 21 and arranged to be fixed to the first flange 13 of the enclosure 1 around the first opening 11. The cable terminal connector 4 is arranged to penetrate the wall of the enclosure 1 on the side opposite to the first opening 11, and includes a first end 41 positioned inside the enclosure 1 and a second end 42 positioned outside the enclosure 1 and configured to be connected to an external cable.

[0038] The first conductor 31 is arranged to be fixed to the conductive insert 21, for example via a bolt, so as to be electrically connected to the conductive insert 21 to form a first assembly. Preferably, according to the illustrated embodiment, the outer shape of the first conductor 31 does not exceed the region defined by the outer shape of the first opening 11 in a cross-section perpendicular to the central axis A1 of the first opening 11, that is, in a cross-section parallel to the central axis A2 of the second opening 12. Therefore, the first assembly may be directly fixed to the first flange 13 of the enclosure 1 via the insulator 2 without using an auxiliary adapter.

[0039] The second conductor 32 is arranged to be electrically connected to the first end portion 41 of the cable terminal connector 4 to form a second assembly, and a passage 32a is provided that penetrates the entire second conductor 32 along the central axis A2 of the second opening 12. Preferably, according to the illustrated embodiment, the second assembly is fixedly connected to the first end portion 41 of the cable terminal connector 4 and further includes a fourth conductor 34 into which one end of the second conductor 32 is inserted. In this case, the second conductor 32 is arranged to be movable relative to the fourth conductor 34 along a direction perpendicular to the central axis A2 of the second opening 12, and is electrically connected to the fourth conductor 34 via an electrical contact 62 such as a coil spring disposed around the end portion of the second conductor 32 and embedded in the fourth conductor 34.

[0040] The third conductor 33 is arranged to be inserted into the passage 32a of the second conductor 32 and is electrically connected to the second conductor 32 via an electrical contact 61 such as a coil spring embedded in the passage 32a. The third conductor 33 is movable relative to the second conductor 32 (and thus relative to the enclosure 1) within the passage 32a substantially along the central axis A2 of the second opening 12, and is fixedly connected to or separated from the first conductor 31, thereby achieving a detachable electrical connection between the first conductor 31 and the second conductor 32, that is, a detachable electrical connection between the first assembly and the second assembly.

[0041] It is conceivable that the moving direction of the third conductor 33 (i.e., the extending direction of the passage 32a) does not have to be absolutely along the central axis A2 of the second opening 12. In fact, the moving direction of the third conductor 33 may be parallel to but slightly spaced from the central axis A2 of the second opening 12, or may be slightly inclined with respect to the central axis A2 of the second opening 12, as long as the third conductor 33 can pass through the second opening 12.

[0042] Preferably, according to the illustrated embodiment, the third conductor 33 is detachably connected to the first conductor 31 via a bolt 5 that passes through the third conductor 33 and is screwed into the first conductor 31, and the central axis of the bolt 5 coincides with the central axis A2 of the second opening 12. That is, when it is necessary to electrically connect the first conductor 31 to the second conductor 32, in order to securely and fixedly connect the third conductor 33 to the first conductor 31 by tightening the bolt 5, a tool such as a screwdriver is inserted into the enclosure 1 from the second opening 12 along the central axis A2 of the second opening 12. Similarly, when it is necessary to electrically insulate the first conductor 31 from the second conductor 32, in order to separate the third conductor 33 from the first conductor 31 by loosening the bolt 5, a tool such as a screwdriver is inserted into the enclosure 1 from the second opening 12 along the central axis A2 of the second opening 12.

[0043] During the assembly of the cable module, first, the first assembly formed by the insulator 2 and the first conductor 31 is directly fixed to the first flange 13 of the enclosure 1 around the first opening 11 so that the first conductor 31 is positioned at a predetermined position inside the enclosure 1. Next, the second assembly formed by the cable terminal connector 4, the second conductor 32, and optionally the fourth conductor 34 is passed through the wall of the enclosure 1 on the opposite side of the first opening 11 so that the first end 41 of the cable terminal connector 4, the second conductor 32, and the fourth conductor 34 are positioned at predetermined positions inside the enclosure 1. Finally, the third conductor 33 is arranged by a tool passing through the second opening 12 so as to detachably and electrically connect the first assembly to the second assembly. The third conductor 33 may be pre-inserted into the passage 32a of the second conductor 32 before the second assembly is inserted into the enclosure 1, or it can be understood that the third conductor 33 may be inserted into the passage 32a of the second conductor 32 from the second opening 12 by a tool after the second assembly is inserted into the enclosure 1.

[0044] The cable module having a detachable electrical connection according to the present disclosure is found to have a relatively simple structure that is easy to manufacture and has low material costs. Further, the cable module enables quick, safe, and convenient disassembly and assembly of its detachable breakage structure, thereby significantly reducing on-site working time and labor costs.

[0045] Furthermore, due to the movability of the third conductor 33 relative to the second conductor 32 along the direction of the central axis A2 of the second opening 12, and optionally the movability of the second conductor 32 relative to the fourth conductor 34 along the direction perpendicular to the central axis A2 of the second opening 12, such a detachable breakage structure may compensate for misalignments caused by manufacturing tolerances or thermal expansion / contraction during operation in both directions, thereby effectively avoiding damage to these components and extending the lifespan of the cable module.

[0046] Furthermore, according to the illustrated embodiment, the cable module is integrated with a high-voltage detection sensor and further includes a first cover 7 fixed to the second flange 14 of the enclosure 1 around the second opening 12. Alternatively, the first cover 7 may be further integrated with an expansion port 71 and a densitometer 72. In a variant, the first cover 7 may be used only to cover the second opening 12 without being integrated with other functions.

[0047] Furthermore, according to the illustrated embodiment, the enclosure 1 is further provided with a third opening 15, and the cable module is integrated with an explosion-proof film and further includes a second cover 8 fixed to the third flange 16 of the enclosure 1 around the third opening 15. Alternatively, the second cover 8 may be further integrated with a moisture absorbent.

[0048] FIG. 7 is a schematic cross-sectional view of the grounding structure of the cable module. As shown in FIG. 7, when the second opening 12 is opened to take out the third conductor 33, the grounding on the cable side may be simply achieved by a substantially T-shaped metal piece 9 that is partially inserted into the passage 32a of the second conductor 32 and fixed to the second flange 14 of the enclosure 1.

[0049] The technical content and features of the present disclosure have been disclosed as above. However, under the creative idea of the present disclosure, those skilled in the art may make various changes and improvements to the concepts disclosed above, and all of these changes and improvements belong to the protection scope of the present disclosure. The description of the above embodiments is illustrative rather than limiting, and the protection scope of the present disclosure is defined by the appended claims.

Claims

Claim 1 A cable module for a high-voltage gas-insulated apparatus having a detachable electrical connection part, an enclosure (1) provided with a first opening (11) and a second opening (12), an insulator (2) provided with a conductive insert (21) and fixed to a first flange (13) of the enclosure (1) around the first opening (11), a cable terminal connector (4) penetrating the wall of the enclosure (1), comprising a first end portion (41) positioned inside the enclosure (1) and a second end portion (42) positioned outside the enclosure (1) and configured to be connected to an external cable, a plurality of conductors including a first conductor (31) electrically connected to the conductive insert (21), a second conductor (32) electrically connected to the first end portion (41) of the cable terminal connector (4), and a third conductor (33) detachably and electrically connecting the first conductor (31) to the second conductor (32), a fourth conductor (34) fixedly connected to the first end portion (41) of the cable terminal connector (4), comprising, the third conductor (33) is configured to be movable relative to the enclosure (1) substantially along the central axis (A2) of the second opening (12), fixedly connected to or separated from the first conductor (31), and the second conductor (32) is configured to be movable relative to the fourth conductor (34) along a direction perpendicular to the central axis (A2) of the second opening (12), and is electrically connected to the fourth conductor (34) via a second electrical contact (62) embedded in the fourth conductor (34). A cable module. Claim 2 The cable module according to claim 1, wherein the third conductor (33) is detachably connected to the first conductor (31) via a bolt (5), and the central axis of the bolt coincides with the central axis (A2) of the second opening (12). Claim 3 The cable module according to claim 1, wherein the third conductor (33) is configured to be movable relative to the second conductor (32) along the central axis (A2) of the second opening (12), and is electrically connected to the second conductor (32) via a first electrical contact (61) embedded in the second conductor (32). Claim 4 The second conductor (32) is provided with a passage (32a) penetrating the entire second conductor (32) along the central axis (A2) of the second opening (12), and the third conductor (33) is configured to be movable within the passage (32a) in which the first electrical contact (61) is embedded. The cable module according to claim 3.

5. The cable module according to any one of claims 1 to 4, wherein the central axis (A1) of the first opening (11) is perpendicular to the central axis (A2) of the second opening (12).

6. The cable module according to any one of claims 1 to 4, wherein the outer shape of the first conductor (31) does not exceed the region defined by the contour of the first opening (11) in a cross-section perpendicular to the central axis (A1) of the first opening (11).

7. The cable module according to any one of claims 1 to 4, further comprising a first cover (7) integrated with a high-voltage detection sensor and fixed to the second flange (14) of the enclosure (1) around the second opening (12).

8. The enclosure (1) is further provided with a third opening (15), and the cable module is integrated with an explosion-proof film and further comprises a second cover (8) fixed to the third flange (16) of the enclosure (1) around the third opening (15). The cable module according to any one of claims 1 to 4.

9. A high-voltage gas-insulated apparatus comprising the cable module having a detachable electrical connection portion according to any one of claims 1 to 4.

10. A method for manufacturing a cable module for a high-voltage gas-insulated apparatus having a detachable electrical connection portion, providing an enclosure (1) having a first opening (11) and a second opening (12); providing an insulator (2) having a conductive insert (21); providing a first conductor (31) electrically connected to the conductive insert (21), and fixing an assembly of the insulator (2) and the first conductor (31) to the first flange (13) of the enclosure (1) around the first opening (11); providing a cable terminal connector (4) having a first end (41) and a second end (42); Provide a second conductor (32) electrically connected to the first end (41) of the cable terminal connector (4), and position the first end (41) inside the enclosure (1), and position the second end (42) outside the enclosure (1) and connected to an external cable. Pass the assembly of the cable terminal connector (4) and the second conductor (32) through the wall of the enclosure (1). Provide a third conductor (33) that is removably and electrically connected to the second conductor (32). The third conductor (33) is configured to be movable relative to the enclosure (1) substantially along the central axis (A2) of the second opening (12), and is fixedly connected to the first conductor (31) or separated from the first conductor (31). Provide a fourth conductor (34) fixedly connected to the first end (41) of the cable terminal connector (4). The second conductor (32) is configured to be movable relative to the fourth conductor (34) along a direction perpendicular to the central axis (A2) of the second opening (12), and is electrically connected to the fourth conductor (34) via a second electrical contact (62) embedded in the fourth conductor (34). A method comprising the above.

11. The method according to claim 10, wherein the third conductor (33) is removably connected to the first conductor (31) via a bolt (5), and the central axis of the bolt coincides with the central axis (A2) of the second opening (12).

12. The method according to claim 11, wherein the connection or separation between the first conductor (31) and the third conductor (33) is carried out by inserting a tool into the enclosure (1) from the second opening (12) along the central axis (A2) of the second opening (12).

13. The method according to claim 10, wherein the third conductor (33) is configured to be movable relative to the second conductor (32) along the central axis (A2) of the second opening (12), and is electrically connected to the second conductor (32) via a first electrical contact (61) embedded in the second conductor (32).

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