Cable connection structure, power cable, and method for manufacturing a cable connection structure.

Abstract

To provide a cable connection structure which is of a simple composition, yet has both water impermeability and electrical discontinuity.SOLUTION: In a connected power cable 10, a cable connection structure 20 has a sleeve 200 that connects a first power cable 100a and a second power cable 100b, an insulating unit 300 that covers the outer circumference of the sleeve, and a protection part 400 that protects portions of the insulating unit and the first power cable and a portion of the second power cable from the outside. The protection part has a first metal layer 410 that continuously covers the partial outer circumference of the first power cable and the outer circumference of the insulating unit in a region close to the first power cable, an insulating layer 420 that continuously covers the outer circumference of the insulating unit that is exposed from the first metal layer and the partial outer circumference of the first metal layer, and a second metal layer 430 that continuously covers the partial outer circumference of the second power cable and the outer circumference of the insulting layer in a region close to the second power cable, and that overlaps the insulating layer above a portion of the first metal layer. The second metal layer is insulated from the first metal layer by the insulating layer.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a cable connection structure, a power cable, and a method for manufacturing the cable connection structure.

Background Art

[0002] Conventionally, a metal pipe may be provided so as to surround the periphery of the connection portion of a pair of power cables (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to achieve both waterproofness and electrical insulation with a simple configuration.

Means for Solving the Problems

[0005] According to one aspect of the present disclosure, a first power cable and a second power cable each having a conductor, a cylindrical sleeve connecting the conductor of the first power cable and the conductor of the second power cable, an insulating unit provided so as to cover the outer periphery of the periphery of the sleeve and maintaining the insulation of the periphery of the sleeve, a protective part for protecting the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, and having the protective part includes a first metal layer provided so as to continuously cover the outer periphery of a part of the first power cable and the outer periphery of the insulating unit in a region close to the first power cable, An insulating layer is provided so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer, and the outer periphery of a part of the first metal layer, A second metal layer is provided so as to continuously cover a portion of the outer circumference of the second power cable and the outer circumference of the insulating layer in the area close to the second power cable, and is superimposed on the insulating layer above a portion of the first metal layer, It has, The second metal layer is insulated from the first metal layer by the insulating layer. A cable connection structure is provided. [Effects of the Invention]

[0006] According to this disclosure, both water-blocking and electrical isolation can be achieved with a simple configuration. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic cross-sectional view showing a power cable. [Figure 2] Figure 2 is a schematic cross-sectional view along the axial direction of a conductor showing a cable connection structure according to the first embodiment of this disclosure. [Figure 3A] Figure 3A is a schematic cross-sectional view showing an enlarged portion of the protective part according to the first embodiment of this disclosure. [Figure 3B] Figure 3B is a schematic cross-sectional view showing an enlarged portion of the protective part according to Modification 1-1 of the first embodiment of this disclosure. [Figure 3C] Figure 3C is a schematic cross-sectional view showing an enlarged portion of the protective part according to Modification 1-2 of the first embodiment of this disclosure. [Figure 4] Figure 4 is a schematic cross-sectional view along the axial direction of a conductor showing a cable connection structure according to a second embodiment of the present disclosure. [Figure 5A] Figure 5A is a schematic cross-sectional view showing an enlarged portion of the protective part according to the second embodiment of this disclosure. [Figure 5B] Figure 5B is a schematic cross-sectional view showing an enlarged portion of the protective part according to Modification 2-1 of the second embodiment of this disclosure.

Embodiments for Carrying Out the Invention

[0008] [Description of Embodiments of the Present Disclosure] [Findings Obtained by the Inventors, etc.] First, the findings obtained by the inventors, etc. will be described.

[0009] In a conventional intermediate connection part where a pair of power cables are connected, as described above, for example, a metal pipe was provided to protect the outside of an insulating unit covering a conductor connection pipe. The water shielding property was ensured by the metal pipe.

[0010] Here, in the intermediate connection part, in order to separate the grounding systems in a pair of power cables, it may be necessary to electrically separate the metal pipes. Such a connection part may be referred to as an "insulating connection part". By providing an insulating connection part for each of the three-phase power cables and cross-bonding and grounding the cable metal shielding layers of the three-phase power cables, the induced voltage generated in the cable metal shielding layer can be suppressed. Further, by providing an insulating connection part, the excessive propagation of the ground fault current can be suppressed, and the ground fault location can be easily specified.

[0011] In a conventional insulating connection part, a cylindrical insulator was interposed at an intermediate position in the axial direction of the metal pipe to separate the metal pipe in the region close to the first power cable and the metal pipe in the region close to the second power cable. With such a configuration, both the water shielding property and the electrical insulation property were achieved.

[0012] However, the metal pipe with an insulator interposed had a complicated and heavy structure. For this reason, the construction of the insulating connection part was difficult, and the cost related to the insulating connection part was increasing.

[0013] In order to solve such problems, the present inventor considered replacing the conventional metal pipe with a sheet-like metal layer in the insulating connection part.

[0014] First, similar to the conventional copper tube, a structure was considered in which the metal layer was separated with a predetermined separation portion in the axial direction of the power cable at the insulating connection portion. However, in such a structure, the water shielding property at the separation portion deteriorates, and moisture permeation occurs from the separation portion. That is, since the metal layer does not cover the entire insulating unit, moisture permeation occurs.

[0015] Therefore, the inventor of the present invention has found a configuration that can cover the entire insulating unit with a metal layer and ensure electrical interruption (also referred to as "insulation property") while maintaining high water shielding property.

[0016] The following disclosure is based on the above findings found by the present disclosure inventors.

[0017] <Embodiments of the Present Disclosure> Next, embodiments of the present disclosure will be listed and described.

[0018] [1] The cable connection structure according to one aspect of the present disclosure is a first power cable and a second power cable each having a conductor, a cylindrical sleeve that connects the conductor of the first power cable and the conductor of the second power cable, an insulating unit provided so as to cover the outer periphery of the sleeve, and maintaining the insulation of the periphery of the sleeve, a protection unit that protects the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, and has the protection unit is a first metal layer provided so as to continuously cover the outer periphery of a part of the first power cable and the outer periphery of the insulating unit in a region close to the first power cable, an insulating layer provided so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer and the outer periphery of a part of the first metal layer, A second metal layer is provided so as to continuously cover a portion of the outer circumference of the second power cable and the outer circumference of the insulating layer in the area close to the second power cable, and is superimposed on the insulating layer above a portion of the first metal layer, It has, The second metal layer is insulated from the first metal layer by the insulating layer. This configuration makes it possible to achieve both watertightness and electrical isolation with a simple design.

[0019] [2] Cable connection structures relating to other aspects of the present disclosure include: A first power cable and a second power cable, each having a conductor, A cylindrical sleeve connecting the conductor of the first power cable and the conductor of the second power cable, An insulating unit is provided so as to cover the outer circumference of the sleeve and maintain the insulating properties around the sleeve, The insulating unit, a protective part that protects the outside of a part of the first power cable and a part of the second power cable, It has, The aforementioned protective part is A first metal layer provided so as to cover at least a portion of the outer circumference of the first power cable, A second metal layer is provided so as to cover at least a portion of the outer circumference of the second power cable, and is spaced apart from the first metal layer with a predetermined spacing between them in the axial direction of the conductor, An insulating layer is provided so as to continuously cover the outer periphery of a portion of the first metal layer, the outer periphery of the insulating unit exposed in the separated portion, and the outer periphery of a portion of the second metal layer, A third metal layer is provided so as to cover the outer periphery of the insulating layer and overlaps the insulating layer above both a part of the first metal layer and a part of the second metal layer, It has, The third metal layer is insulated from the first metal layer and the second metal layer by the insulating layer. This configuration makes it possible to achieve both watertightness and electrical isolation with a simple design.

[0020] [3] In the cable connection structure described in [1] or [2] above, The aforementioned insulating unit is An internal semiconducting layer having semiconductivity is arranged to cover at least the outer circumference of the sleeve, The aforementioned internal semiconducting layer, an insulating unit insulating layer provided to cover the outer circumference of a portion of the first power cable and a portion of the second power cable, and having insulating properties, An external semiconducting layer having semiconductivity is provided so as to cover the outer circumference of the insulating layer, a part of the first power cable, and a part of the second power cable, It has, The external semiconducting layer has at least one separation portion separated in the axial direction of the first power cable and the second power cable, The insulating layer of the protective portion is in contact with and covers the separation portion of the insulating unit. This configuration makes it possible to stably ensure electrical disconnection of the cable connection structure.

[0021] [4] In the cable connection structure described in any one of [1] to [3] above, The aforementioned insulating layer is made up of multiple layers. This configuration makes it possible to improve the insulating properties of the portion where the first metal layer and the second metal layer are insulated by the insulating layer.

[0022] [5] Power cables relating to further aspects of this disclosure include: The system comprises and connects at least one of the cable connection structures described in any one of [1] to [4] above. This configuration makes it possible to achieve both watertightness and electrical isolation with a simple design.

[0023] [6] A method for manufacturing a cable connection structure according to yet another aspect of the present disclosure is: The process involves preparing a first power cable and a second power cable, each having a conductor, The process involves connecting the conductor of the first power cable and the conductor of the second power cable with a cylindrical sleeve, A step of providing an insulating unit that maintains the insulating properties around the sleeve so as to cover the outer circumference of the sleeve, A step of providing a protective part to protect the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, It has, The step of providing the protective part is, A step of providing a first metal layer so as to continuously cover a portion of the outer circumference of the first power cable and the outer circumference of the insulating unit in the area close to the first power cable, A step of providing an insulating layer so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer, and the outer periphery of a part of the first metal layer, A step of providing a second metal layer such that it continuously covers a portion of the outer circumference of the second power cable and the outer circumference of the insulating layer in the area close to the second power cable, and overlaps the insulating layer above a portion of the first metal layer, It has, In the step of providing the second metal layer, The second metal layer is insulated from the first metal layer by the insulating layer. This configuration makes it possible to achieve both watertightness and electrical isolation with a simple design.

[0024] [7] A method for manufacturing a cable connection structure according to yet another aspect of the present disclosure is: The process involves preparing a first power cable and a second power cable, each having a conductor, The process involves connecting the conductor of the first power cable and the conductor of the second power cable with a cylindrical sleeve, A step of providing an insulating unit that maintains the insulating properties around the sleeve so as to cover the outer circumference of the sleeve, A step of providing a protective part to protect the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, It has, The step of providing the protective part is, A step of providing a first metal layer so as to cover at least a portion of the outer circumference of the first power cable, A step of providing a second metal layer such that it covers at least a portion of the outer circumference of the second power cable and is spaced apart from the first metal layer with a predetermined spacing between them in the axial direction of the conductor, A step of providing an insulating layer so as to continuously cover the outer periphery of a portion of the first metal layer, the outer periphery of the insulating unit exposed in the separated portion, and the outer periphery of a portion of the second metal layer, A step of providing a third metal layer that covers the outer periphery of the insulating layer and overlaps the insulating layer above both a portion of the first metal layer and a portion of the second metal layer, It has, In the step of providing the third metal layer, The third metal layer is insulated from the first metal layer and the second metal layer by the insulating layer. This configuration makes it possible to achieve both watertightness and electrical isolation with a simple design.

[0025] [Details of the embodiments of this disclosure] Next, a first embodiment of the present disclosure will be described below with reference to the drawings. However, the present disclosure is not limited to these examples, and is intended to include all modifications within the meaning and scope of the equivalents of the claims.

[0026] <First Embodiment of this Disclosure> (1) Connected power cables and cable connection structures The schematic configuration of the connected power cable 10 and cable connection structure (cable connection part) 20 according to the first embodiment of this disclosure will be described with reference to Figures 1 and 2.

[0027] Note that the lower half of the configuration is omitted in Figure 2. In Figure 2, the stripped power cable 100 and sleeve 200 are shown from the side.

[0028] As shown in Figure 2, the connected power cable 10 of this embodiment includes, for example, a plurality of power cables 100 and at least one cable connection structure 20.

[0029] In the following, "axial direction" of the power cable 100, etc., refers to the direction along the central axis of the power cable 100, etc., and can be rephrased as the longitudinal direction of the power cable 100, etc. Furthermore, "radial direction" of the power cable 100, etc., refers to the direction perpendicular to the axial direction of the power cable 100, etc., and can, in some cases, be rephrased as the short direction of the power cable 100, etc. Finally, "circumferential direction" of the power cable 100, etc., refers to the direction along the outer circumference of the power cable 100, etc.

[0030] [First power cable and second power cable] As shown in Figure 1, the power cable 100 is configured as a solid-insulated cable, which is a high-voltage power transmission cable.

[0031] The power cable 100 shown in Figure 1 is configured as, for example, a land cable or an underground cable, and has a conductor 110, an internal semiconducting layer 120, a cable insulation layer 130, an external semiconducting layer 140, a water-absorbing layer (not shown), a cable metal shielding layer 150, and a cable sheath 160, in this order from the region near the central axis of the conductor 110 toward the outer circumference. The portion of the power cable 100 from the conductor 110 to the external semiconducting layer 140 is sometimes called the "cable core". The cable insulation layer 130 contains a polyolefin such as polyethylene. The polyolefin may be crosslinked. The cable metal shielding layer 150 is, for example, a metal sheath or a layer of copper wire or copper tape.

[0032] The conductor 110 has, for example, a plurality of conducting strands 112. In each conducting strand layer 114, the plurality of conducting strands 112 are arranged by twisting them together in a spiral shape, for example, along the outer surface of the inner layer. The conducting strands 112 include, for example, at least one of copper and aluminum.

[0033] As shown in Figure 2, the power cable 100 is stripped in stages from the tip of the conductor 110 toward the opposite side (so-called "stepped stripping"). That is, the conductor 110, the internal semiconducting layer 120, the cable insulation layer 130, the external semiconducting layer 140, the cable metal shielding layer 150, and the cable sheath 160 are exposed in this order from the tip of the conductor 110 toward the opposite side. Hereafter, each of the stepped stripped parts may be referred to as the "exposed part". With this configuration, power cables 100 can be connected sequentially from the region close to the central axis toward the outer circumference.

[0034] As shown in Figure 2, multiple power cables 100 are provided. Of the multiple power cables 100, a pair of power cables 100 are butted together with the axes of their conductors 110 aligned. In the following, one of the pair of power cables 100 may be referred to as the "first power cable 100a," and the other power cable 100 may be referred to as the "second power cable 100b."

[0035] [Cable connection structure] As shown in Figure 2, the cable connection structure 20 is configured to connect a pair of power cables 100, for example, as a so-called insulated connection part. Specifically, the cable connection structure 20 includes, for example, the pair of power cables 100 described above, a sleeve (conductor connection tube) 200, an insulating unit (insulating tube, rubber connection tube, rubber unit) 300, and a protective part 400.

[0036] (sleeve) The sleeve 200 is configured, for example, as a cylindrical metal tube and is provided to surround the ends of each of the pair of conductors 110 so as to connect the conductors 110 of the pair of power cables 100. The cylindrical sleeve 200 may have a partition wall (not shown) between the pair of conductors 110 within the hollow portion.

[0037] For example, a semiconducting tape may be wrapped around the cable insulation layer 130 to fill the space between the pair of cable insulation layers 130. This can suppress uneven surface pressure of the insulation unit 300, which will be described later.

[0038] (Insulation unit) The insulating unit 300 is configured, for example, as an insulating cylindrical member and is provided to cover the outer circumference of the sleeve 200.

[0039] The insulating unit 300 is configured, for example, as a so-called room-temperature shrinkable type or a factory-expandable type. That is, the insulating unit 300 has an elastic material that is integrally molded and is designed to shrink elastically at room temperature to closely adhere to the connection portion of the power cable 100.

[0040] Furthermore, the insulating unit 300 is configured to mitigate the electric field around the sleeve 200 while maintaining insulation around the sleeve 200. Specifically, the insulating unit 300 includes, for example, an internal semiconducting layer 320, an insulating unit insulating layer 340, and an external semiconducting layer 380.

[0041] The internal semiconducting layer 320 is configured in a cylindrical shape to cover the outer circumference of the sleeve 200. The internal semiconducting layer 320 contains, for example, semiconducting rubber. The internal semiconducting layer 320 is at the same potential as the sleeve 200.

[0042] The insulating unit insulating layer 340 is provided to cover the outer periphery of the internal semiconducting layer 320, a portion of the first power cable 100a, and a portion of the second power cable 100b. The insulating unit insulating layer 340 includes, for example, insulating rubber.

[0043] The external semiconducting layer 380 is provided to cover the outer periphery of the insulating unit insulating layer 340, a portion of the first power cable 100a, and a portion of the second power cable 100b. The external semiconducting layer 380 contains semiconducting rubber.

[0044] The outer semiconducting layer 380 has, for example, a stress cone portion 360. The stress cone portion 360 is provided at positions close to both ends in the axial direction of the insulating unit insulating layer 340 and has a substantially tapered inner surface that widens toward the axial center of the insulating unit insulating layer 340. A portion of the inner surface of the stress cone portion 360 is in contact with the cable outer semiconducting layer 140 of the stripped power cable 100.

[0045] This configuration of the insulating unit 300 allows for electrical shielding around the sleeve 200 while mitigating the electric field at the tip of the cable's outer semiconducting layer 140.

[0046] In this embodiment, the outer semiconducting layer 380 has at least one isolation section SP separated in the axial direction of the first power cable 100a and the second power cable 100b. Here, the isolation section SP is provided, for example, at a position close to the second power cable 100b, separating the region close to the first power cable 100a from the region close to the second power cable 100b. This allows the insulating unit 300 to be electrically isolated between the shielding of the first power cable 100a and the shielding of the second power cable 100b.

[0047] Furthermore, if both ends of the insulating unit 300 in the axial direction have end faces perpendicular to the axial direction, a slope may be formed by wrapping a semiconducting tape (not shown) around the vicinity of the end faces.

[0048] (Protection Department) The protective section 400 is provided so as to cover the outer circumference of the insulating unit 300 and a portion of the outer circumference of each of the pair of power cables 100, and is configured to protect the outside of these. The protective section 400 of this embodiment will be described in detail later.

[0049] (Configuration outside of protective section 400) Outside the protective section 400 in the axial direction of the conductor 110, the shielding of the first power cable 100a (cable metal shielding layer 150) and the shielding of the second power cable 100b (cable metal shielding layer 150) are connected to the grounding system, respectively. In the case of cross-bonded grounding, the shielding of the first power cable 100a and the shielding of the second power cable 100b are each connected to the shielding of other phases in adjacent sections.

[0050] Additionally, a coffin box (not shown) may be provided to surround the protective section 400 as needed. This protects the protective section 400 from external damage.

[0051] (2) Protective part The protective section 400 according to the first embodiment of this disclosure will be described with reference to Figures 2 and 3A. In Figure 3A, and later in Figures 3B and 3C, components other than the protective section 400 and the outermost insulating layer 490 are omitted, and the lower surface of the protective section 400 is shown as flat for simplification.

[0052] As shown in Figures 2 and 3A, the protective part 400 of this embodiment has, for example, a sandwich structure including a metal layer / insulating layer / metal layer as an electrical isolation structure. Specifically, the protective part 400 has, for example, a first metal layer 410, an insulating layer (resin layer, protective insulating layer) 420, a second metal layer 430, and an outermost insulating layer 490.

[0053] The first metal layer 410 is provided to continuously cover, for example, a portion of the outer circumference of the first power cable 100a (the cable outer semiconductive layer 140 exposed by the first power cable 100a) and the outer circumference of the insulating unit 300 in a region close to the first power cable 100a. A portion of the first metal layer 410 may extend to a position closer to the second power cable 100b than to the axial center of the insulating unit 300.

[0054] Specifically, the first metal layer 410 has, for example, a rectangular solid metal sheet. Examples of metals that make up the sheet of the first metal layer 410 include aluminum and aluminum alloys. The first metal layer 410 is wrapped around the region from a part of the outer circumference of the first power cable 100a to the outer circumference of the insulating unit 300 in the region close to the first power cable 100a, such that the long side of the sheet is aligned with the central axis of the first power cable 100a. The wrapped first metal layer 410 is overlapped so as not to create any gaps. The wrapping of the first metal layer 410 may be, for example, the so-called longitudinal lapping described above, or it may be a spiral winding.

[0055] The first metal layer 410 may have, for example, a two-layer structure. Specifically, the first metal layer 410 may have, for example, a first metal shielding layer including a metal mesh tape and a first metal water-blocking layer including a metal sheet, in this order from the region closest to the insulating unit 300 toward the outer periphery. The tape of the first metal shielding layer may be, for example, a copper mesh tape. The first metal shielding layer is configured as a layer that confines the electric field formed by the high-potential conductor 110 inside the insulating unit 300. The first metal shielding layer has, for example, a cross-sectional area (capacity) sufficient to allow the short-circuit current at the time of dielectric breakdown to flow. On the other hand, the first metal water-blocking layer is configured as, for example, a layer that prevents moisture from the outside from entering the insulating unit 300 (water-blocking). The first metal water-blocking layer does not require the same cross-sectional area as the first metal shielding layer, but the first metal water-blocking layer has, for example, a solid metal sheet with no gaps so as to not allow moisture to pass through. This configuration allows for the separation of functions between a first metal shielding layer with excellent electrical shielding properties and a first metal water-blocking layer with excellent water-blocking properties.

[0056] The insulating layer 420 is provided to continuously cover, for example, the outer periphery of the insulating unit 300 exposed from the first metal layer 410, and the outer periphery of a portion of the first metal layer 410.

[0057] Specifically, the insulating layer 420 may include, for example, a heat-shrinkable insulating tube or insulating tape. Examples of materials that make up the insulating layer 420 include polyethylene and silicone rubber. The overlapping portion of the first metal layer 410 described above is fixed by such an insulating layer 420.

[0058] The second metal layer 430 is provided to continuously cover, for example, a portion of the outer circumference of the second power cable 100b (the cable outer semiconducting layer 140 exposed by the second power cable 100b) and the outer circumference of the insulating layer 420 in the area close to the second power cable 100b. Furthermore, the second metal layer 430 overlaps the insulating layer 420, for example, above a portion of the first metal layer 410.

[0059] Specifically, the second metal layer 430 has, for example, a rectangular metal sheet, similar to the first metal layer 410. The second metal layer 430 is wrapped around a region from a portion of the outer circumference of the second power cable 100b to the outer circumference of the insulating layer 420 in the region close to the second power cable 100b, and to a portion of the outer circumference of the first metal layer 410, such that the longer side of the sheet aligns with the second power cable 100b. The wrapped second metal layer 430 is overlapped so as not to create any gaps.

[0060] The second metal layer 430 may have a two-layer structure, similar to the first metal layer 410. Specifically, the second metal layer 430 may have, for example, a second metal shielding layer including a metal mesh tape and a second metal water-impermeable layer including a metal sheet, in this order from the region closest to the insulating unit 300 toward the outer periphery. The tape of the second metal shielding layer may be, for example, a copper mesh tape. The first metal water-impermeable layer has a solid metal sheet without gaps. The functions of the second metal shielding layer and the second metal water-impermeable layer are the same as those of the first metal shielding layer and the first metal water-impermeable layer described above.

[0061] On the other hand, in this embodiment, the second metal layer 430 overlaps the insulating layer 420 above a portion of the first metal layer 410, as described above, and is insulated from the first metal layer 410 by the insulating layer 420. This makes it possible to electrically separate the shielding of the first power cable 100a and the shielding of the second power cable 100b.

[0062] Furthermore, in this embodiment, the insulating layer 420 of the protective part 400 is in contact with, for example, the isolation portion SP of the outer semiconductive layer 380 of the insulating unit 300, while covering the said isolation portion SP. In other words, the insulating layer 420 of the protective part 400 directly overlaps the isolation portion SP of the outer semiconductive layer 380 of the insulating unit 300. This makes it possible to align the electrically isolated portion of the protective part 400 with the isolation portion SP of the insulating unit 300.

[0063] Furthermore, as long as the insulation distance of the electrical isolation points for the entire cable connection structure 20 is ensured, the electrical isolation points of the protective section 400 and the isolation points SP of the insulating unit 300 do not need to be perfectly aligned. For example, either the electrical isolation point of the protective section 400 or the isolation point SP of the insulating unit 300 may be smaller, or they may be offset in the axial direction of the conductor 110.

[0064] Furthermore, in this embodiment, the insulating layer 420 extends, for example, outward from the end of the second metal layer 430 in the axial direction of the conductor 110. This suppresses short circuits between the end of the second metal layer 430 and the first metal layer 410. As a result, the aforementioned electrical disconnection can be stably maintained.

[0065] Furthermore, in this embodiment, the outermost insulating layer 490 is provided on the outermost periphery of the protective part 400. Specifically, the outermost insulating layer 490 has, for example, a heat-shrinkable insulating tube or insulating tape. The outermost insulating layer 490 is provided to continuously cover, for example, the outer periphery of the first metal layer 410 exposed from the insulating layer 420, the outer periphery of the insulating layer 420 exposed from the second metal layer 430, and the outer periphery of the second metal layer 430. The overlapping portion of the second metal layer 430 is fixed by the outermost insulating layer 490. As a result, water-blocking and electrical isolation in the protective part 400 can be stably maintained.

[0066] (3) Method for manufacturing cable connection structures (method for manufacturing connected power cables, method for connecting cables) Next, with reference to Figures 1 to 3A, a method for manufacturing the cable connection structure according to this embodiment will be described.

[0067] The manufacturing method for the cable connection structure 20 of this embodiment includes, for example, a preparation step S10, a conductor connection step S20, an insulation unit placement step S30, and a protective part formation step S40.

[0068] (S10: Preparation process) First, prepare the components for each layer of the cable connection structure 20: the pair of power cables 100, the sleeve 200, the insulation unit 300, and the protective section 400.

[0069] For example, in a factory, an inner core ribbon (not shown) is wound spirally in advance to form a cylindrical inner core (not shown), and this inner core is inserted into the hollow portion of the insulating unit 300. This expands the diameter of the insulating unit 300.

[0070] Next, for example, at the power cable 100 installation site, the pair of power cables 100 are peeled off in stages axially from one end of each cable. This exposes the conductor 110, cable insulation layer 130, cable outer semiconducting layer 140, and cable sheath 160 in that order from the tip of the power cable 100.

[0071] Once the components constituting the cable connection structure 20 are prepared, the insulating unit 300 and the protective part 400 are passed through the power cable 100, and the insulating unit 300 and the heat-shrinkable insulating tubes that form the insulating layer 420 and outermost insulating layer 490 of the protective part 400 are left to rest in their respective positions on the power cable 100.

[0072] (S20: Conductor connection process) Once preparation step S10 is complete, the pair of power cables 100 are butted together inside the sleeve 200 with the axes of their conductors 110 aligned. After butting the pair of power cables 100 together, the conductors 110 of the pair of power cables 100 are compressed and connected by the sleeve 200.

[0073] Alternatively, semiconductive tape may be wrapped around the cable to fill the space between the pair of cable insulation layers 130.

[0074] (S30: Insulation unit placement process) Once the conductor connection process S20 is completed, an insulating unit 300 is installed to maintain the insulation around the sleeve 200, covering the outer circumference of the sleeve 200. Specifically, the insulating unit 300, which has been expanded by the inner core, is moved to a position where it overlaps with the sleeve 200. Once the insulating unit 300 is in place, the inner core ribbon is gradually unraveled, gradually reducing the diameter of the insulating unit 300 in the axial direction. In this way, the insulating unit 300 is positioned to cover the outer circumference of the sleeve 200 and a portion of the outer circumference of each of the pair of power cables 100.

[0075] (S40: Protective part forming process) Once the insulating unit 300 is in place, a protective section 400 is provided to protect the outside of the insulating unit 300, a portion of the first power cable 100a, and a portion of the second power cable 100b.

[0076] The protective part formation step S40 of this embodiment includes, for example, a first metal layer formation step S41, an insulating layer formation step S42, a second metal layer formation step S43, and an outermost insulating layer formation step S49.

[0077] (S41: First metal layer formation step) First, a metal sheet is wrapped around a portion of the outer circumference of the first power cable 100a and the outer circumference of the insulating unit 300 in the area close to the first power cable 100a, thereby providing the first metal layer 410.

[0078] (S42: Insulating layer formation process) Once the first metal layer 410 is in place, the insulating tube, which had been set aside in advance, is moved to a position where it overlaps with the outer circumference of the insulating unit 300 exposed from the first metal layer 410 and a portion of the outer circumference of the first metal layer 410, and the insulating tube is heat-shrinked. In this way, the insulating layer 420 is provided so as to continuously cover the outer circumference of the insulating unit 300 exposed from the first metal layer 410 and a portion of the outer circumference of the first metal layer 410.

[0079] Alternatively, insulating tape may be wrapped around the material as the insulating layer 420. In this case, there is no need to pre-cut the material as with insulating tubing, which can shorten the working time.

[0080] In this embodiment, the insulating layer 420 of the protective part 400 is brought into contact with the separation part SP of the outer semiconductive layer 380 of the insulating unit 300, and the separation part SP is covered by the insulating layer 420.

[0081] At this time, the overlapping portion of the first metal layer 410 is fixed by heat-shrinking the insulating tube that constitutes the insulating layer 420.

[0082] (S43: Second metal layer formation step) After providing the insulating layer 420, a metal sheet is wrapped around it so as to continuously cover a portion of the outer circumference of the second power cable 100b and the outer circumference of the insulating layer 420 in the area close to the second power cable 100b, and so as to overlap the insulating layer 420 above a portion of the first metal layer 410. This provides the second metal layer 430.

[0083] In this embodiment, the second metal layer 430 is placed on top of the insulating layer 420 above a portion of the first metal layer 410, thereby insulating the first metal layer 410 and the second metal layer 430 with the insulating layer 420.

[0084] (S49: Outermost insulating layer formation process) Once the second metal layer 430 is formed, the insulating tube that was previously set aside is moved to a position where it overlaps with the outer circumference of the first metal layer 410 exposed from the insulating layer 420, the outer circumference of the insulating layer 420 exposed from the second metal layer 430, and the outer circumference of the second metal layer 430, and the insulating tube is heat-shrinked. In this way, the outermost insulating layer 490 is provided so as to continuously cover the outer circumference of the first metal layer 410 exposed from the insulating layer 420, the outer circumference of the insulating layer 420 exposed from the second metal layer 430, and the outer circumference of the second metal layer 430.

[0085] At this time, the overlapping portion of the second metal layer 430 is fixed by heat-shrinking the insulating tube that constitutes the outermost insulating layer 490.

[0086] Subsequently, the shielding of the first power cable 100a and the shielding of the second power cable 100b are directly connected to the grounding system. Furthermore, if necessary, a coffin box is provided to surround the protective section 400.

[0087] Based on the above, the cable connection structure 20 of this embodiment is manufactured.

[0088] (4) Summary of this embodiment This embodiment provides one or more of the following effects.

[0089] (a) In this embodiment, the protective section 400 has a sandwich structure as an electrical isolation structure, which includes a first metal layer 410 / insulating layer 420 / second metal layer 430. That is, the second metal layer 430 covering the outer periphery of the region close to the second power cable 100b is on top of the insulating layer 420, above a portion of the first metal layer 410 covering the outer periphery of the region close to the first power cable 100a.

[0090] In this way, by overlapping the first metal layer 410, the insulating layer 420, and the second metal layer 430 in this order, the outer circumference of a portion of the first power cable 100a, the outer circumference of the insulating unit 300, and the outer circumference of a portion of the second power cable 100b can be seamlessly covered by the water-impermeable first metal layer 410 and the second metal layer 430. This ensures water imperfections in the cable connection structure 20.

[0091] Furthermore, because the second metal layer 430 overlaps the insulating layer 420 above the first metal layer 410, the first metal layer 410 connected to the shielding of the first power cable 100a and the second metal layer 430 connected to the shielding of the second power cable 100b can be insulated in the thickness direction by the insulating layer 420. This allows the shielding of the first power cable 100a and the shielding of the second power cable 100b to be electrically separated. In other words, even with a simple configuration, the induced voltage generated in the cable metal shielding layer 150 of the three-phase power cable can be stably suppressed. In addition, the propagation of ground fault current can be stably suppressed, making it possible to easily and stably identify the location of the ground fault.

[0092] As a result, according to this embodiment, it is possible to achieve both water-blocking and electrical isolation with a simple configuration.

[0093] (b) In this embodiment, the insulating layer 420 of the protective part 400 is in contact with and covers the separation part SP of the outer semiconductive layer 380 of the insulating unit 300. This makes it possible to align the electrically isolated point of the protective part 400 with the separation part SP of the insulating unit 300. As a result, it is possible to suppress electrical connection between the shielding of the first power cable 100a and the shielding of the second power cable 100b caused by misalignment between the electrically isolated point of the protective part 400 and the separation part SP of the insulating unit 300. In other words, it is possible to stably ensure the electrical disconnection of the cable connection structure 20.

[0094] (5) Modified form of the first embodiment The embodiments described above can be modified as necessary, as shown in the following examples. Below, only elements that differ from the embodiments described above will be described, and elements that are substantially the same as those described in the embodiments above will be denoted by the same reference numerals and their descriptions will be omitted.

[0095] Referring to Figures 3B and 3C, modified examples 1-1 and 1-2 of this embodiment will be described, respectively.

[0096] <Variation 1-1> As shown in Figure 3B, in modified example 1-1, the end of the insulating layer 420 in the axial direction of the conductor 110 coincides, for example, with the end of the second metal layer 430.

[0097] Furthermore, in modified example 1-1, the insulating layer 420 extends, for example, below the second metal layer 430, in the axial direction of the conductor 110, longer than the isolation portion SP of the insulating unit 300. This allows for misalignment (positional displacement) between the electrically isolated portion of the protective portion 400 and the isolation portion SP of the insulating unit 300. As a result, it becomes possible to stably ensure the electrical disconnection of the cable connection structure 20.

[0098] <Variation 1-2> As shown in Figure 3C, in Modification 1-2, the insulating layer 420 is, for example, laminated in multiple layers. Here, the insulating layer 420 is laminated in two layers. This makes it possible to increase the total thickness of the insulating layer 420 between the first metal layer 410 and the second metal layer 430. As a result, the insulating properties of the portion insulated between the first metal layer 410 and the second metal layer 430 by the insulating layer 420 can be improved.

[0099] <Second Embodiment of the Present Invention> Next, a second embodiment of the present invention will be described. Hereinafter, as with the above-described modified example 1-1, the description of elements that are substantially the same as those described in the above-described embodiment will be omitted as appropriate.

[0100] (1) Protection part As shown in Figures 4 and 5A, the protective section 400 of this embodiment has, for example, two sandwich structures including a metal layer / insulating layer / metal layer as an electrical isolation structure. Specifically, the protective section 400 has, for example, a first metal layer 440, a second metal layer 450, an insulating layer 460, a third metal layer 470, and an outermost insulating layer 490.

[0101] The first metal layer 440 is provided, for example, to cover at least a portion of the outer circumference of the first power cable 100a. Here, for example, similar to the first embodiment, the first metal layer 440 is provided to continuously cover a portion of the outer circumference of the first power cable 100a and the outer circumference of the insulating unit 300 in the area close to the first power cable 100a. A portion of the first metal layer 440 may extend to a position closer to the second power cable 100b than the axial center of the insulating unit 300.

[0102] The second metal layer 450 is provided, for example, so as to cover at least a portion of the outer circumference of the second power cable 100b, and is spaced apart from the first metal layer 440 with a predetermined gap in the axial direction of the conductor 110. Here, for example, the second metal layer 450 is provided only on a portion of the outer circumference of the second power cable 100b (the cable outer semiconducting layer 140 exposed by the second power cable 100b), and does not cover the outer circumference of the insulating unit 300.

[0103] The first metal layer 440 and the second metal layer 450 have rectangular metal sheets, similar to the first embodiment. The first metal layer 440 and the second metal layer 450, which are wrapped around each other, are overlapped so as not to create any gaps between them.

[0104] The insulating layer 460 is provided to continuously cover, for example, the outer periphery of a portion of the first metal layer 440, the outer periphery of the insulating unit 300 exposed in the space between the first metal layer 440 and the second metal layer 450, and the outer periphery of a portion of the second metal layer 450.

[0105] The insulating layer 460 fixes the overlapping portions of the first metal layer 440 and the second metal layer 450 described above.

[0106] Furthermore, in this embodiment, the insulating layer 460 of the protective portion 400, for example, in the spaced portion between the first metal layer 440 and the second metal layer 450, is in contact with and covers the separation portion SP of the outer semiconductive layer 380 of the insulating unit 300.

[0107] The third metal layer 470 is provided, for example, to (continuously) cover the outer periphery of the insulating layer 460, and overlaps the insulating layer 460 over both a portion of the first metal layer 440 and a portion of the second metal layer 450. As a result, the third metal layer 470 is insulated from the first metal layer 440 and the second metal layer 450 by the insulating layer 460.

[0108] The third metal layer 470, like the first metal layer 440 and the second metal layer 450, is also constructed as a rectangular sheet containing metal. The wrapped third metal layer 470 is overlapped so as not to create any gaps between the layers.

[0109] Furthermore, in this embodiment, the insulating layer 460 extends, for example, outward from the end of the third metal layer 470 in the axial direction of the conductor 110. This makes it possible to suppress short circuits between the end of the third metal layer 470 and either the first metal layer 440 or the second metal layer 450. As a result, the aforementioned electrical disconnection can be stably maintained.

[0110] The outermost insulating layer 490 is provided on the outermost periphery of the protective portion 400. The overlapping portion of the third metal layer 470 described above is fixed by the outermost insulating layer 490.

[0111] (2) Method for manufacturing cable connection structure The protective part formation step S40 of this embodiment includes, for example, a first metal layer formation step S44, a second metal layer formation step S45, an insulating layer formation step S46, a third metal layer formation step S47, and an outermost insulating layer formation step S49.

[0112] (S44: First metal layer formation step) The first metal layer 440 is provided so as to cover at least a portion of the outer circumference of the first power cable 100a.

[0113] (S45: Second metal layer formation step) On the other hand, the second metal layer 450 is provided so as to cover at least a portion of the outer circumference of the second power cable 100b and to be spaced apart from the first metal layer 440 with a predetermined spacing between them in the axial direction of the conductor 110.

[0114] (S46: Insulating layer formation process) After the first metal layer 440 and the second metal layer 450 are provided, one insulating tube that was previously set aside is moved to a position where it overlaps with a portion of the outer circumference of the first metal layer 440, the outer circumference of the insulating unit 300 exposed in the space between the first metal layer 440 and the second metal layer 450, and a portion of the outer circumference of the second metal layer 450, and the insulating tube is heat-shrinked. In this way, an insulating layer 460 is provided so as to continuously cover a portion of the outer circumference of the first metal layer 440, the outer circumference of the insulating unit 300 exposed in the space between the first metal layer 440 and the second metal layer 450, and a portion of the outer circumference of the second metal layer 450.

[0115] In this embodiment, the insulating layer 460 of the protective part 400 is brought into contact with the separation part SP of the outer semiconductive layer 380 of the insulating unit 300, and the separation part SP is covered by the insulating layer 460.

[0116] (S47: Third metal layer formation step) After providing the insulating layer 460, a third metal layer 470 is provided so as to continuously cover the outer periphery of the insulating layer 460 and overlap the insulating layer 460 above both a portion of the first metal layer 440 and a portion of the second metal layer 450.

[0117] The subsequent steps are the same as in the first embodiment.

[0118] (3) Summary of this embodiment In this embodiment, the protective section 400 has two electrical isolation structures: a sandwich structure including a first metal layer 440 / insulating layer 460 / third metal layer 470, and a sandwich structure including a second metal layer 450 / insulating layer 460 / third metal layer 470. That is, the third metal layer 470 overlaps the insulating layer 460 over both a portion of the first metal layer 440 and a portion of the second metal layer 450.

[0119] In the modified example 1-2 described above, insulation can be improved by laminating multiple insulating layers 420. However, it is necessary to thread multiple shrinkable insulating tubes onto the power cable 100 in advance before the insulating layer formation process. This may make the work difficult or increase the working time.

[0120] Furthermore, in the above-described modifications 1-2, the total thickness of the insulating layer 420, which has inferior water-impermeability compared to the metal layer, increases, which may make it easier for moisture to permeate through the insulating layer 420. As a result, water-impermeability may decrease.

[0121] In contrast, in this embodiment, the first metal layer 440 and the second metal layer 450 can be insulated from the third metal layer 470 by only one insulating layer 460. That is, electrical isolation at two points can be ensured by only one insulating layer 460.

[0122] This means that only one shrinkable insulating tube needs to be pre-inserted. In other words, the work required to form the insulating layer 460 can be made easier, and the time required for this work can be reduced.

[0123] Furthermore, by using only one insulating layer 420, the thickness of the insulating layer 420, which has inferior water-blocking properties compared to the metal layer, can be reduced. This makes it possible to suppress the decrease in water-blocking properties caused by the thickness of the insulating layer 420.

[0124] As a result, it becomes possible to stably improve both water resistance and electrical isolation while facilitating the manufacturing of the cable connection structure 20.

[0125] (4) Modified form of the second embodiment Referring to Figure 5B, a modified example 2-1 of this embodiment will be described.

[0126] <Variation 2-1> As shown in Figure 5B, in Modification 2-1, the end of the insulating layer 460 in the axial direction of the conductor 110 coincides, for example, with the end of the third metal layer 470. Even in Modification 2-1, the effects of the second embodiment can be obtained.

[0127] <Other embodiments of this disclosure> Although embodiments of this disclosure have been described in detail above, this disclosure is not limited to the embodiments described above, and can be modified in various ways without departing from its essence.

[0128] In the above-described embodiment, one cable connection structure 20 of the connected power cables 10 was explained, but the connected power cables 10 may have multiple cable connection structures 20.

[0129] In the embodiments described above, the case in which the cable connection structure 20 is applied to three-phase AC has been explained, but the cable connection structure 20 may also be applied to DC.

[0130] In the above-described embodiment, the case in which the external semiconducting layer 380 has one isolation portion SP was explained, but the external semiconducting layer 380 may have, for example, two isolation portions SP. In this case, of the two isolation portions SP, the first isolation portion SP is in contact with the insulating layer 420 of the protective portion 400 and is covered by the insulating layer 420. That is, the electrical disconnection of the first isolation portion SP is ensured. On the other hand, a copper mesh tape is wrapped around the second isolation portion SP, and the external semiconducting layer 380 sandwiching the second isolation portion SP is connected.

[0131] In the embodiments described above, the case in which the insulating layer 420 or insulating layer 460 has a heat-shrinkable insulating tube or insulating tape was described, but the insulating layer 420 or insulating layer 460 may be composed of a combination of a shrinkable insulating tube and insulating tape.

[0132] While the first metal layer 410 and the second metal layer 430 in the first embodiment described above, and the first metal layer 440, the second metal layer 450, and the third metal layer 470 in the second embodiment described above, are each composed of a metal sheet, the metal layers of this disclosure are not limited to being composed solely of metal. Each metal layer may have a resin layer on at least one of the front and back surfaces of the metal sheet. Furthermore, each metal layer may be configured so that the metal sheet having the resin layer can be closed with a fastener. In addition, each metal layer may have an adhesive layer on at least one of the front and back surfaces of the metal sheet.

[0133] The first embodiment described above includes a case where the first metal layer 410 and the second metal layer 430, and the first metal layer 440, the second metal layer 450, and the third metal layer 470 in the second embodiment described above each contain the same metal (aluminum). However, this disclosure is not limited to this case. These metal layers may contain different metals. However, from the viewpoint of suppressing galvanic corrosion, it is preferable for these metal layers to contain the same metal.

[0134] In the second embodiment described above, the configuration shown in Figure 4 was exemplified as the protective portion 400, but the disclosure is not limited to this case. The first metal layer 440 may be provided to cover only a portion of the outer circumference of the first power cable 100a, for example. On the other hand, the second metal layer 450 may be provided to continuously cover a portion of the outer circumference of the second power cable 100b and the outer circumference of the insulating unit 300 in the area close to the second power cable 100b.

[0135] <Note> The details of this disclosure are described below.

[0136] (Note 1) A first power cable and a second power cable, each having a conductor, A cylindrical sleeve connecting the conductor of the first power cable and the conductor of the second power cable, An insulating unit is provided so as to cover the outer circumference of the sleeve and maintain the insulating properties around the sleeve, The insulating unit, a protective part that protects the outside of a part of the first power cable and a part of the second power cable, It has, The aforementioned protective part is A first metal layer is provided so as to continuously cover a portion of the outer circumference of the first power cable and the outer circumference of the insulating unit in a region close to the first power cable, An insulating layer is provided so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer, and the outer periphery of a part of the first metal layer, A second metal layer is provided so as to continuously cover a portion of the outer circumference of the second power cable and the outer circumference of the insulating layer in the area close to the second power cable, and is superimposed on the insulating layer above a portion of the first metal layer, It has, The second metal layer is insulated from the first metal layer by the insulating layer. Cable connection structure.

[0137] (Note 2) The insulating layer extends outward in the axial direction of the conductor beyond the end of the second metal layer. Cable connection structure as described in Appendix 1.

[0138] (Note 3) A first power cable and a second power cable, each having a conductor, A cylindrical sleeve connecting the conductor of the first power cable and the conductor of the second power cable, An insulating unit is provided so as to cover the outer circumference of the sleeve and maintain the insulating properties around the sleeve, The insulating unit, a protective part that protects the outside of a part of the first power cable and a part of the second power cable, It has, The aforementioned protective part is A first metal layer provided so as to cover at least a portion of the outer circumference of the first power cable, A second metal layer is provided so as to cover at least a portion of the outer circumference of the second power cable, and is spaced apart from the first metal layer with a predetermined spacing between them in the axial direction of the conductor, An insulating layer is provided so as to continuously cover the outer periphery of a portion of the first metal layer, the outer periphery of the insulating unit exposed in the separated portion, and the outer periphery of a portion of the second metal layer, A third metal layer is provided so as to cover the outer periphery of the insulating layer and overlaps the insulating layer above both a part of the first metal layer and a part of the second metal layer, It has, The third metal layer is insulated from the first metal layer and the second metal layer by the insulating layer. Cable connection structure.

[0139] (Note 4) The insulating layer extends outward in the axial direction of the conductor beyond the end of the third metal layer. Cable connection structure as described in Appendix 3.

[0140] (Note 5) The aforementioned insulating unit is An internal semiconducting layer having semiconductivity is arranged to cover at least the outer circumference of the sleeve, The aforementioned internal semiconducting layer, an insulating unit insulating layer provided to cover the outer circumference of a portion of the first power cable and a portion of the second power cable, and having insulating properties, An external semiconducting layer having semiconductivity is provided so as to cover the outer circumference of the insulating layer, a part of the first power cable, and a part of the second power cable, It has, The external semiconducting layer has at least one separation portion separated in the axial direction of the first power cable and the second power cable, The insulating layer of the protective part is in contact with and covers the separating part of the insulating unit. The cable connection structure described in any one of the appendices 1 through 4.

[0141] (Note 6) The insulating layer is made up of multiple layers. The cable connection structure described in any one of the appendices 1 through 5.

[0142] (Note 7) The first metal layer is A first metal shielding layer including a metal mesh tape, A first metal waterproof layer containing a metal sheet, has The cable connection structure described in any one of the appendices 1 through 6.

[0143] (Note 8) The aforementioned second metal layer is A second metal shielding layer including a metal mesh tape, A second metal waterproof layer containing a metal sheet, has The cable connection structure described in any one of the appendices 1 through 7.

[0144] (Note 9) The system comprises at least one cable connection structure as described in any one of the appendices 1 to 8, and is connected Power cable.

[0145] (Note 10) The process involves preparing a first power cable and a second power cable, each having a conductor, The process involves connecting the conductor of the first power cable and the conductor of the second power cable with a cylindrical sleeve, A step of providing an insulating unit that maintains the insulating properties around the sleeve so as to cover the outer circumference of the sleeve, A step of providing a protective part to protect the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, It has, The step of providing the protective part is, A step of providing a first metal layer so as to continuously cover a portion of the outer circumference of the first power cable and the outer circumference of the insulating unit in the area close to the first power cable, A step of providing an insulating layer so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer, and the outer periphery of a part of the first metal layer, A step of providing a second metal layer such that it continuously covers a portion of the outer circumference of the second power cable and the outer circumference of the insulating layer in the area close to the second power cable, and overlaps the insulating layer above a portion of the first metal layer, It has, In the step of providing the second metal layer, The second metal layer is insulated from the first metal layer by the insulating layer. A method for manufacturing a cable connection structure.

[0146] (Note 11) The process involves preparing a first power cable and a second power cable, each having a conductor, The process involves connecting the conductor of the first power cable and the conductor of the second power cable with a cylindrical sleeve, A step of providing an insulating unit that maintains the insulating properties around the sleeve so as to cover the outer circumference of the sleeve, A step of providing a protective part to protect the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, It has, The step of providing the protective part is, A step of providing a first metal layer so as to cover at least a portion of the outer circumference of the first power cable, A step of providing a second metal layer such that it covers at least a portion of the outer circumference of the second power cable and is spaced apart from the first metal layer with a predetermined spacing between them in the axial direction of the conductor, A step of providing an insulating layer so as to continuously cover the outer periphery of a portion of the first metal layer, the outer periphery of the insulating unit exposed in the separated portion, and the outer periphery of a portion of the second metal layer, A step of providing a third metal layer that covers the outer periphery of the insulating layer and overlaps the insulating layer above both a portion of the first metal layer and a portion of the second metal layer, It has, In the step of providing the third metal layer, The third metal layer is insulated from the first metal layer and the second metal layer by the insulating layer. A method for manufacturing a cable connection structure. [Explanation of Symbols]

[0147] 10. Connected power cables 20 Cable connection structure 100 Power Cables 100a No. 1 Power Cable 100b Second power cable 110 conductor 112 Conductor strands 114 Conductor strand layer 120 Cable internal semiconducting layer 130 Cable insulation layer 140 Cable outer semiconducting layer 150 Cable metal shielding layer 160 Cable Sheath 200 sleeves 300 Insulation Units 320 Internal semiconducting layer 340 Insulation Unit Insulation Layer 360 Stress Cone Section 380 Outer semiconducting layer 400 Protection Department 410 1st metal layer 420 Insulating layer 430 2nd metal layer 440 1st metal layer 450 2nd metal layer 460 Insulating layer 470 Third metal layer 490 Outermost insulating layer SP separation part

Claims

1. A first power cable and a second power cable, each having a conductor, A cylindrical sleeve connecting the conductor of the first power cable and the conductor of the second power cable, An insulating unit is provided so as to cover the outer circumference of the sleeve and maintain the insulating properties around the sleeve, The insulating unit, a protective part that protects the outside of a part of the first power cable and a part of the second power cable, It has, The aforementioned protective part is A first metal layer provided so as to cover at least a portion of the outer circumference of the first power cable, A second metal layer is provided so as to cover at least a portion of the outer circumference of the second power cable, and is spaced apart from the first metal layer with a predetermined spacing between them in the axial direction of the conductor, An insulating layer is provided so as to continuously cover the outer periphery of a part of the first metal layer, the outer periphery of the insulating unit exposed in the separated portion, and the outer periphery of a part of the second metal layer, A third metal layer is provided so as to cover the outer periphery of the insulating layer and overlaps the insulating layer above both a part of the first metal layer and a part of the second metal layer, It has, The third metal layer is insulated from the first metal layer and the second metal layer by the insulating layer. Cable connection structure.

2. The aforementioned insulating unit is An internal semiconducting layer having semiconductivity is arranged to cover at least the outer circumference of the sleeve, The aforementioned internal semiconducting layer, an insulating unit insulating layer provided to cover the outer circumference of a portion of the first power cable and a portion of the second power cable, and having insulating properties, An external semiconducting layer having semiconductivity is provided to cover the outer circumference of the insulating layer of the insulating unit, a part of the first power cable, and a part of the second power cable, respectively. It has, The outer semiconducting layer has at least one separation portion separated in the axial direction of the first power cable and the second power cable, The insulating layer of the protective part is in contact with and covers the separating part of the insulating unit. The cable connection structure according to claim 1.

3. A first power cable having a first conductor, a first cable internal semiconducting layer, a first cable insulating layer, and a first cable external semiconducting layer in this order from the central axis of the first conductor toward the outer circumference, A second power cable having a second conductor, a second cable internal semiconducting layer, a second cable insulating layer, and a second cable external semiconducting layer arranged in this order from the central axis of the second conductor toward the outer circumference, A cylindrical sleeve connecting the first conductor of the first power cable and the second conductor of the second power cable, An insulating unit is provided so as to cover the outer circumference of the sleeve and maintain the insulating properties around the sleeve, The insulating unit, a protective part that protects the outside of a part of the first power cable and a part of the second power cable, It has, The aforementioned insulating unit is An internal semiconducting layer having semiconductivity is arranged to cover at least the outer circumference of the sleeve, The aforementioned internal semiconducting layer, an insulating unit insulating layer provided to cover the outer circumference of a portion of the first power cable and a portion of the second power cable, and having insulating properties, An external semiconducting layer having semiconductivity is provided to cover the outer circumference of the insulating layer of the insulating unit, a part of the first power cable, and a part of the second power cable, respectively. It has, The outer semiconducting layer has at least one separation portion separated in the axial direction of the first power cable and the second power cable, The aforementioned protective part is A first metal layer is provided that is in direct contact with a portion of the outer circumference of the first cable outer semiconductive layer of the first power cable, and a portion of the outer circumference of the insulating unit in a region close to the first power cable, and that continuously covers the region including these areas. An insulating layer is provided so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer, and the outer periphery of a part of the first metal layer, A second metal layer is provided that is in direct contact with a portion of the outer circumference of the second cable outer semiconducting layer of the second power cable, and that continuously covers the outer circumference of the portion of the outer semiconducting layer of the second cable and the outer circumference of the insulating layer in the region close to the second power cable, and that overlaps the insulating layer above a portion of the first metal layer, It has, The insulating layer of the protective part is in contact with the separating part of the insulating unit and covers the separating part. The second metal layer is insulated from the first metal layer by the insulating layer. Cable connection structure.

4. The insulating layer is made up of multiple layers. The cable connection structure according to claim 1 or claim 3.

5. A cable connection structure comprising at least one of the cable connection structures described in claim 1 or claim 3, and connected Power cable.

6. The process involves preparing a first power cable and a second power cable, each having a conductor, A step of connecting the conductor of the first power cable and the conductor of the second power cable with a cylindrical sleeve, A step of providing an insulating unit that maintains the insulating properties around the sleeve so as to cover the outer circumference of the sleeve, A step of providing a protective part to protect the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, It has, The step of providing the protective part is, A step of providing a first metal layer so as to cover at least a portion of the outer circumference of the first power cable, A step of providing a second metal layer such that it covers at least a portion of the outer circumference of the second power cable and is spaced apart from the first metal layer with a predetermined spacing between them in the axial direction of the conductor, A step of providing an insulating layer so as to continuously cover the outer periphery of a part of the first metal layer, the outer periphery of the insulating unit exposed in the separated portion, and the outer periphery of a part of the second metal layer, A step of providing a third metal layer that covers the outer periphery of the insulating layer and overlaps the insulating layer above both a portion of the first metal layer and a portion of the second metal layer, It has, In the step of providing the third metal layer, The third metal layer is insulated from the first metal layer and the second metal layer by the insulating layer. A method for manufacturing a cable connection structure.

7. A step of preparing a first power cable having a first conductor, a first cable internal semiconducting layer, a first cable insulating layer, and a first cable external semiconducting layer in this order from the central axis of the first conductor toward the outer circumference, and a second power cable having a second conductor, a second cable internal semiconducting layer, a second cable insulating layer, and a second cable external semiconducting layer in this order from the central axis of the second conductor toward the outer circumference, The process involves connecting the first conductor of the first power cable and the second conductor of the second power cable with a cylindrical sleeve, A step of providing an insulating unit that maintains the insulating properties around the sleeve so as to cover the outer circumference of the sleeve, A step of providing a protective part to protect the outside of the insulating unit, a part of the first power cable, and a part of the second power cable, It has, In the step of providing the aforementioned insulating unit, As the aforementioned insulating unit, An internal semiconducting layer having semiconductivity is arranged to cover at least the outer circumference of the sleeve, The aforementioned internal semiconducting layer, an insulating unit insulating layer provided to cover the outer circumference of a portion of the first power cable and a portion of the second power cable, and having insulating properties, An external semiconducting layer having semiconductivity is provided to cover the outer circumference of the insulating layer of the insulating unit, a part of the first power cable, and a part of the second power cable, respectively. It has, The outer semiconducting layer has at least one separation portion that is separated in the axial direction of the first power cable and the second power cable. A unit is provided, The step of providing the protective part is, A step of providing a first metal layer that is in direct contact with a portion of the outer circumference of the first cable outer semiconductive layer of the first power cable and a portion of the outer circumference of the insulating unit in a region close to the first power cable, and that continuously covers the region including these areas. A step of providing an insulating layer so as to continuously cover the outer periphery of the insulating unit exposed from the first metal layer, and the outer periphery of a part of the first metal layer, A step of providing a second metal layer such that it is in direct contact with a portion of the outer circumference of the second cable outer semiconducting layer of the second power cable, continuously covers the outer circumference of the portion of the second cable outer semiconducting layer and the outer circumference of the insulating layer in the region close to the second power cable, and overlaps the insulating layer above a portion of the first metal layer, It has, In the step of providing the insulating layer, The insulating layer of the protective portion is provided so as to be in contact with the separating portion of the insulating unit and cover the separating portion. In the step of providing the second metal layer, The second metal layer is insulated from the first metal layer by the insulating layer. A method for manufacturing a cable connection structure.

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