Cable connection structure, connecting power cable, and method for manufacturing cable connection structure

Abstract

To obtain a stable insulation property for a cable connection structure.SOLUTION: A cable connection structure includes a pair of power cables each having a conductor, a cable insulating layer, and a cable metal shielding layer, in that order from the central axis of the conductor toward the outer periphery, a tubular sleeve connecting the conductors of the pair of power cables, a tubular insulating unit arranged to cover the outer periphery of the area including the sleeve and ensuring insulation around the sleeve, a spacer surrounding the outer periphery of each of the pair of power cables and arranged to contact the axial end of the insulating unit, and gradually reducing in diameter in a direction moving away from the end of the insulating unit along the conductor, a metal wire arranged outside the insulating unit and grounded externally or connecting between the cable metal shielding layers of the pair of power cables, and a shielding connection portion connecting each of the cable metal shielding layers and the metal wire of the pair of power cables, the shielding connection portion being fixed to the spacer.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Various structures have been disclosed as cable connection structures for connecting a pair of power cables (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-216807 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to obtain stable insulation properties for a cable connection structure. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, there is provided a cable connection structure comprising: a pair of power cables each having a conductor, a cable insulating layer, and a cable metal shielding layer, in this order from a central axis of the conductor toward an outer periphery; a tubular sleeve connecting the conductors of the pair of power cables; a tubular insulating unit provided to cover the outer periphery of a region including the sleeve and ensuring insulation around the sleeve; a spacer surrounding the outer periphery of each of the pair of power cables and provided to contact an axial end of the insulating unit, the spacer gradually decreasing in diameter in a direction away from the end of the insulating unit along the conductor; a metal wire disposed outside the insulating unit and grounded to the outside or connecting the cable metal shielding layers of the pair of power cables; and a shielded connection portion connecting the cable metal shielding layer and the metal wire of each of the pair of power cables, wherein the shielded connection portion is fixed to the spacer. [Effects of the Invention]

[0006] According to the present disclosure, stable insulation properties can be obtained for a cable connection structure. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a power cable. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along the axial direction of a conductor, showing a cable connection structure according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a schematic perspective view showing an enlarged portion of a cable connection structure according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a schematic cross-sectional view showing an enlarged portion of a cable connection structure according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a schematic cross-sectional view showing an enlarged portion of a cable connection structure according to an embodiment of the present disclosure. [Figure 6A] FIG. 6A is a schematic perspective view illustrating a spacer according to one embodiment of the present disclosure. [Figure 6B]FIG. 6B is a schematic perspective view illustrating a spacer according to one embodiment of the present disclosure. [Figure 7] FIG. 7 is a schematic cross-sectional view showing an enlarged portion of a cable connection structure according to a first modification of an embodiment of the present disclosure. [Figure 8] FIG. 8 is a schematic cross-sectional view showing an enlarged portion of a cable connection structure according to Modification 2 of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Description of the embodiments of the present disclosure] <Insights gained by the inventor> First, the findings of the inventors will be explained.

[0009] The cable connection structure may be provided with a ground wire that is connected to an external ground or a metal wire configured as a braided wire that connects between the cable metal shield layers of a pair of power cables, and such a metal wire must be connected to the wire shield of the cable metal shield layer in each of the pair of power cables.

[0010] Conventionally, the structure for connecting a metal wire to a wire shield of a cable metal shielding layer has differed depending on the configuration of a protective part that protects the outside of an insulating unit of the cable connection structure.

[0011] For example, when the protective part includes a metal pipe (copper pipe), the wire shield of the cable's metal shielding layer is connected to the braided wire by a crimp sleeve. The braided wire is connected to the metal pipe by soldering. A metal wire serving as a ground wire is drawn out from the metal pipe.

[0012] For example, when the protective portion includes a heat-shrinkable tube having a metal water-blocking layer and a resin layer, the wire shield of the cable metal shielding layer is directly connected to the metal wire serving as the ground wire by a crimping or compression sleeve.

[0013] The above-described conventional structure has the following problems (i) to (iv).

[0014] (i) In conventional cable connection structures, the connection between the metal wire and the wire shield of the cable's metal shielding layer was performed manually. This made the work complicated and the reproducibility of the work difficult due to individual differences between workers. As a result, the structure for connecting the metal wire and the wire shield of the cable's metal shielding layer was uneven among cable connection structures.

[0015] (ii) In conventional cable connection structures, the wire shield of the cable's metallic shielding layer and the metal wire are connected by a sleeve outside the exposed portion of the cable's outer semiconductive layer. This creates the risk that the sleeve will dig into the exposed portion of the cable's outer semiconductive layer, damaging the exposed portion. Furthermore, conventional cable connection structures require the wire shield of the cable's metallic shielding layer to be bent in a direction away from the axial tip of the conductor. This creates the risk that when the wire shield of the cable's metallic shielding layer is bent, the bent portion of the wire shield may come into contact with the exposed portion of the cable's outer semiconductive layer, damaging the exposed portion of the cable's outer semiconductive layer.

[0016] (iii) In the conventional cable connection structure, as described above, the bending structure of the wire shield of the cable metal shielding layer was uneven due to individual differences among workers. Therefore, when the wire shield of the cable metal shielding layer moved due to heat generated during operation, the wire shield could move irregularly at the portion where the wire shield was bent and connected to the metal wire, causing the wire shield to become distorted.

[0017] (iv) In conventional cable connection structures, insulating tape is wrapped around the connection between the metal wire and the wire shield of the cable's metal shielding layer. Due to the above-mentioned (i), the wrapping of the insulating tape is prone to variation at the location where the insulating tape is wrapped. This can lead to unstable electrical characteristics in areas where the insulating tape is thin.

[0018] In conventional cable connection structures, there is a risk that the insulation properties of the cable connection structure may become unstable due to the above-mentioned problems (i) to (iv). Therefore, a cable connection structure that can provide stable insulation properties has been desired.

[0019] The present disclosure below is based on the above findings made by the present inventors.

[0020] <Embodiments of the present disclosure> Next, embodiments of the present disclosure will be listed and described.

[0021] [1] A cable connection structure according to one aspect of the present disclosure includes: a pair of power cables each having a conductor, a cable insulating layer, and a cable metal shielding layer in this order from a central axis of the conductor toward an outer periphery; a cylindrical sleeve connecting the conductors of the pair of power cables; a cylindrical insulating unit provided to cover an outer periphery of an area including the sleeve and to ensure insulation around the sleeve; a spacer surrounding the outer periphery of each of the pair of power cables and provided to contact an end of the insulating unit in the axial direction, the spacer gradually decreasing in diameter in a direction away from the end of the insulating unit along the conductor; a metal wire disposed outside the insulating unit and grounded to the outside or connecting the cable metal shielding layers of the pair of power cables; a shielding connection portion connecting the cable metal shielding layer and the metal wire of each of the pair of power cables; Equipped with The shielding connection is fixed to the spacer. This configuration makes it possible to obtain stable insulation properties for the cable connection structure.

[0022] [2] In the cable connection structure described in [1] above, The spacer is configured as a molded body. This configuration makes it possible to improve the structural stability in the vicinity of the shielded connection portion.

[0023] [3] In the cable connection structure described in [1] or [2] above, the shield connection portion includes a metal and has a current collector plate to which a terminal connected to an end of the cable metal shielding layer and a terminal connected to an end of the metal wire are connected, The current collector plate is fixed to the spacer. This configuration makes it possible to improve the structural stability in the vicinity of the shielded connection portion.

[0024] [4] In the cable connection structure described in [3] above, The current collector plate is placed on the outer peripheral surface of the spacer. According to this configuration, the current collector plate can be easily and stably attached to the spacer.

[0025] [5] In the cable connection structure described in [3] or [4] above, The shield connection portion has a band that fastens the current collector plate to the outer peripheral surface of the spacer. According to this configuration, the current collector plate can be stably fixed to the spacer.

[0026] [6] In the cable connection structure described in [3] or [4] above, The spacer has an engaging portion that engages with the current collector plate to fix the current collector plate to the spacer. According to this configuration, the current collector plate can be easily fixed to the spacer.

[0027] [7] In the cable connection structure described in [3] above, The current collector plate is integrally formed with the spacer. This configuration makes it possible to improve the structural stability in the vicinity of the shielded connection portion.

[0028] [8] In the cable connection structure according to any one of [3] to [7] above, The spacer is a conical portion whose diameter gradually decreases in a direction away from the end of the insulating unit along the conductor; a cylindrical portion connected to the reduced diameter end of the conical portion and extending at a constant diameter in a direction away from the conical portion; and The current collector plate is fixed to the cylindrical portion of the spacer. According to this configuration, the current collector plate can be easily and stably fixed to the cylindrical portion.

[0029] [9] In the cable connection structure according to any one of [3] to [8] above, In the collector plate, the area of ​​a cross section perpendicular to the direction from the connection point of the metal wire toward the connection point of the cable metal shielding layer is equal to or greater than the total area of ​​the cross sections perpendicular to the axial direction of the multiple wire shields included in the cable metal shielding layer. This configuration can prevent the current collector plate from having a high resistance compared to the cable metal shielding layer.

[0030]

[10] A connecting power cable according to yet another aspect of the present disclosure includes: The device includes at least one cable connection structure according to any one of [1] to [9] above. This configuration makes it possible to obtain stable insulation properties.

[0031]

[11] A method for manufacturing a cable connection structure according to yet another aspect of the present disclosure includes: preparing a pair of power cables, each having a conductor, a cable insulating layer, and a cable metallic shielding layer in this order from a central axis of the conductor outward; connecting the conductors of the pair of power cables with a tubular sleeve; a step of disposing an insulating unit that ensures insulation around the sleeve so as to cover the outer periphery of an area including the sleeve; a step of disposing a spacer whose diameter gradually decreases in a direction away from an axial end of the insulating unit along the conductor, so as to surround an outer periphery of the pair of power cables and to contact the end of the insulating unit; a step of connecting a metal wire that is grounded externally or that connects between the cable metal shielding layers of the pair of power cables to each of the cable metal shielding layers of the pair of power cables by a shielding connection part; Equipped with In the step of connecting using the shielded connecting portion, The shield connection is fixed to the spacer. This configuration makes it possible to obtain stable insulation properties for the cable connection structure.

[0032] [Details of the embodiments of the present disclosure] Next, one embodiment of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0033] <One embodiment of the present disclosure> (1) Schematic configuration of connecting power cables and cable connection structure A schematic configuration of a coupled power cable 10 and a cable connection structure (cable connection portion) 20 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 6B.

[0034] 2, 4, and 5, the configuration of the lower half of the cable connection structure 20 is omitted. In FIGS. 2, 4, and 5, the stepped stripped power cable 100, metal wire 190, and bolt 654 are shown from the side. Some hatching is omitted in FIGS. 2, 4, and 5. FIG. 3 shows the protective section 400 in a state where the inner protective layer 430 and the water-blocking heat-shrinkable tube layer 450 have been stripped.

[0035] In the following, the "axial direction" of the power cable 100 refers to the direction along the central axis of the power cable 100, which can be rephrased as the longitudinal direction of the power cable 100. The "radial direction" of the power cable 100 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. The same terms as those used for the power cable 100 are used for other tubular members and columnar members that make up the cable connection structure 20.

[0036] As shown in FIG. 2, the linked power cable 10 of this embodiment includes, for example, a plurality of power cables 100 and at least one cable connection structure 20.

[0037] (First power cable and second power cable) 1, the power cable 100 is configured as a solid insulated cable that is a high-voltage power transmission cable for land or underground use. The power cable 100 is configured as, for example, a CV cable (Cross-Linked Polyethylene insulated Vinylchloride sheath cable, also known as an XLPE cable).

[0038] Specifically, the power cable 100 has, for example, a conductor 110, a cable inner semiconductive layer 120, a cable insulating layer 130, a cable outer semiconductive layer 140, a water absorbing layer (not shown), a cable metal shielding layer 150, and a cable sheath 160, in this order from the central axis of the conductor 110 to the outer periphery.

[0039] The conductor 110 has, for example, a plurality of conductor wires (reference numerals not shown). The conductor wires contain, for example, at least one of copper and aluminum.

[0040] The cable insulation layer 130 comprises a polyolefin, such as polyethylene, which may be cross-linked.

[0041] The cable metal shielding layer 150 has, for example, a plurality of wire shields (hereinafter, sometimes referred to as wire shields 152 in relation to FIG. 3) containing copper. The cable metal shielding layer 150 is formed by wrapping the plurality of wire shields 152 around the outer circumferential surface of the inner layer.

[0042] As shown in Fig. 2, the power cable 100 is stripped in stages (so-called "stage stripped") from the axial tip of the conductor 110 toward the opposite side. That is, the conductor 110, the cable-inner semiconductive layer 120, the cable insulating layer 130, the cable-outer semiconductive layer 140, the cable metallic shielding layer 150, and the cable sheath 160 are exposed in this order from the axial tip of the conductor 110 toward the opposite side. Hereinafter, each stage-stripped portion may be referred to as an "exposed portion." With this configuration, power cables 100 can be connected to each other in order, starting from a region close to the central axis toward the outer periphery.

[0043] As shown in Fig. 2, a plurality of power cables 100 are provided. Of the plurality of power cables 100, a pair of power cables 100 are butted together with the axes of their conductors 110 aligned. Hereinafter, one power cable 100 of the pair of power cables 100 may be referred to as a "first power cable 100a," and the other power cable 100 may be referred to as a "second power cable 100b."

[0044] (cable connection structure) 2, the cable connection structure 20 is configured to connect a pair of power cables 100 as a so-called insulated connection portion for, for example, three-phase alternating current. 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, a spacer 500, a metal wire 190, a shielded connection portion 600, and a protective portion 400.

[0045] (sleeve) The sleeve 200 is configured as, for example, a cylindrical metal tube, connects the conductors 110 of a pair of power cables 100 together, and is provided so as to surround the ends of each of the pair of conductors 110. The cylindrical sleeve 200 may have a partition wall (reference number not shown) in the center of the hollow portion.

[0046] For example, a semiconductive tape may be wound around the insulating unit 300 so as to fill the space between the pair of cable insulating layers 130. This makes it possible to suppress uneven surface pressure of the insulating unit 300.

[0047] (Isolation unit) The insulating unit 300 is configured as, for example, an insulating tubular member, and is provided so as to cover the outer periphery of the region including the sleeve 200 .

[0048] The insulating unit 300 is configured as, for example, a so-called cold-shrinkable or factory-expandable type, i.e., the insulating unit 300 has an integrally molded elastic material and elastically shrinks at room temperature to fit closely to the connection portion of the power cable 100.

[0049] The insulating unit 300 is configured to, for example, ensure insulation around the sleeve 200 while mitigating the electric field around the sleeve 200. Specifically, the insulating unit 300 has, for example, an inner semiconductive layer 320, an insulating unit insulating layer 340, and an outer semiconductive layer 380.

[0050] The internal semiconductive layer 320 is formed in a cylindrical shape so as to cover the outer periphery of the sleeve 200. The internal semiconductive layer 320 includes, for example, semiconductive rubber. The internal semiconductive layer 320 and the sleeve 200 have the same potential.

[0051] The insulating unit insulating layer 340 is provided so as to cover the outer periphery of each of the inner semiconductive 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 contains, for example, rubber having insulating properties.

[0052] The outer semiconductive layer 380 is provided in the outer region of the insulation unit 300, and is provided so as to cover the outer peripheries of the insulation unit insulating layer 340, a portion of the first power cable 100a, and a portion of the second power cable 100b. The outer semiconductive layer 380 contains semiconductive rubber.

[0053] The outer semiconductive layer 380 has, for example, a stress cone portion 360. The stress cone portion 360 is provided at a position close to each of both axial ends of the insulation unit insulating layer 340. The stress cone portion 360 has a cone-shaped inner peripheral surface whose diameter expands toward the center of the insulation unit insulating layer 340 in the axial direction. A portion of the inner peripheral surface of the stress cone portion 360 contacts the exposed portion of the cable outer semiconductive layer 140 of the step-stripped power cable 100.

[0054] Such a configuration of the insulating unit 300 makes it possible to electrically shield the periphery of the sleeve 200 while mitigating the electric field at the tip of the cable outer semiconductive layer 140 .

[0055] In this embodiment, the outer semiconductive layer 380 has at least one separation portion SP that is separated in the axial direction of the first power cable 100a and the second power cable 100b. For example, one separation portion SP is provided near the second power cable 100b. The separation portion SP separates, for example, an area near the first power cable 100a from an area near the second power cable 100b. This allows the insulating unit 300 to electrically separate the shield of the first power cable 100a from the shield of the second power cable 100b.

[0056] In this embodiment, a first axial end of the insulation unit 300 is provided with a first end face 390a that is perpendicular to the central axis of the insulation unit 300. Meanwhile, a second axial end of the insulation unit 300, opposite the first axial end, is provided with a second end face 390b that is perpendicular to the central axis of the insulation unit 300. Such perpendicular first end face 390a and second end face 390b of the insulation unit 300 are used as support surfaces when, for example, an expanded diameter pipe for passing the power cable 100 through is hydraulically inserted into the hollow portion of the insulation unit 300.

[0057] (spacer) The spacers 500 are provided, for example, near each of the first and second axial ends of the insulating unit 300, forming a smooth slope.

[0058] (metal wire) The metal wire 190 is, for example, arranged outside the insulating unit 300. The metal wire 190 is configured, for example, as a ground wire that is grounded to the outside, or as a braided wire that connects between the cable metal shielding layers 150 of a pair of power cables 100. In this case, the metal wire 190 is configured as a ground wire that is connected to the shielding of another phase in an adjacent section for so-called cross-bond grounding.

[0059] (Shielding joint) The shielding connection portion 600 is arranged, for example, outside the insulating unit 300 and is configured to connect each cable metal shielding layer 150 of the pair of power cables 100 to the above-mentioned metal wire 190.

[0060] (Protection Department) The protective portion 400 is provided to cover the outer periphery of the insulating unit 300, the outer periphery of the spacer 500, and a portion of the outer periphery of each of the pair of power cables 100, and is configured to protect the outside of these.

[0061] (2) Structure outside the insulation unit Next, with reference to FIGS. 2 to 6B, the spacer 500, the shielded connection part 600, the shielding structure, and the protective part 400, which are components outside the insulating unit 300 of the cable connection structure 20 of this embodiment, will be described in detail.

[0062] (2-1) Spacer 2 to 6B, the spacer 500 is provided, for example, to surround the outer periphery of each of the pair of power cables 100 and to contact the axial end of the insulation unit 300. For example, the spacer 500 gradually reduces in diameter in a direction away from the axial end of the insulation unit 300 along the conductor 110. This allows the formation of a gentle slope (inclined surface, conical surface) from the outer periphery of the insulation unit 300 to the outer periphery of the power cable 100.

[0063] Hereinafter, the spacer 500 surrounding the outer periphery of the first power cable 100a will be referred to as the "first spacer 500a," and the spacer 500 surrounding the outer periphery of the second power cable 100b will be referred to as the "second spacer 500b."

[0064] In this embodiment, the spacer 500 is made of, for example, a molded body, which makes it possible to easily form a slope near the end of the insulating unit 300 in the axial direction.

[0065] In this embodiment, the spacer 500 includes, for example, a thermoplastic resin. This allows the spacer 500 to be easily molded. The spacer 500 may be, for example, insulating, semi-conductive, or conductive. Examples of the thermoplastic resin for the spacer 500 include nylon, polycarbonate, and phenolic resin. Nylon, in particular, has the rigidity, heat resistance, and electrical properties required for the spacer 500, and also allows for easy molding.

[0066] In this embodiment, the spacer 500 has, for example, a hollow structure, which can prevent sink marks in the resin during molding.

[0067] In the present embodiment, the spacer 500 is divided into, for example, multiple pieces. The spacer 500 includes at least a first divided portion 512 and a second divided portion 514. The first divided portion 512 and the second divided portion 514 are divided at a cross section including the central axis CA. This allows the first divided portion 512 and the second divided portion 514 to be fitted together from outside the outer periphery of the power cable 100.

[0068] In this embodiment, as shown in FIGS. 2 to 6B, the spacer 500 has, for example, a conical portion 520, a cylindrical portion 540, and a grip portion 560.

[0069] The conical portion 520 is configured, for example, in a conical shape, and gradually reduces in diameter in the axial direction of the spacer 500. The expanded end of the conical portion 520 is disposed so as to contact the end of the insulating unit 300 in the axial direction.

[0070] The cylindrical portion 540 is, for example, cylindrically configured, connected to the reduced diameter end of the conical portion 520, and extends with a constant diameter in a direction away from the conical portion 520.

[0071] The gripping portion 560 is provided, for example, on the opposite side of the cylindrical portion 540 from the conical portion 520, and is configured to grip the outer periphery of the power cable 100. Specifically, the gripping portion 560 has a diameter that is further reduced from the cylindrical portion 540. The reduced-diameter end of the gripping portion 560 abuts against the outer periphery of a semiconductive tape layer 480 (described below) that covers the exposed portion of the cable outer semiconductive layer 140.

[0072] As described above, the spacer 500 has a two-stage structure, which reduces the volume of the air layer formed in the hollow portion of the spacer 500. This makes it possible to prevent heat from building up in the hollow portion of the spacer 500.

[0073] In this embodiment, each of the conical portion 520, the cylindrical portion 540 and the gripping portion 560 has, for example, a rib 580.

[0074] The ribs 580 are, for example, plate-shaped and are provided radially from the inner circumferential surfaces of the conical portion 520, the cylindrical portion 540, and the gripping portion 560 toward the central axis CA. The ribs 580 extend, for example, across the conical portion 520, the cylindrical portion 540, and the gripping portion 560. As a result, even if stress (shrinkage force, tightening force) of the inner protective layer 430 and the water-blocking heat-shrinkable tubing layer 450 is applied to the spacer 500 around the spacer 500 in the protective portion forming step S60, which will be described later, the ribs 580 can maintain the shape of the spacer 500.

[0075] In the present embodiment, for example, a plurality of ribs 580 are provided. Specifically, for example, the ribs 580 are provided at positions that are four-fold symmetric around the central axis CA of the spacer 500. The first divided portion 512 and the second divided portion 514 have ribs 580 at positions where they contact each other, and are configured to engage with each other via the ribs 580. This allows the spacer 500 to be held on the outer periphery of the power cable 100 with the first divided portion 512 and the second divided portion 514 coupled together even if the user releases the spacer 500. In other words, the spacer 500 can be easily attached.

[0076] (2-2) Shielding joint As shown in FIGS. 2 to 5, in the shielded connection portion 600 of the cable connection structure 20, the wire shield 152 of the cable metal shielding layer 150 of the pair of power cables 100 is connected to a metal wire 190 that is grounded externally.

[0077] In this embodiment, the shielded connection part 600 is fixed to, for example, the spacer 500. This makes it possible to stabilize the structure around the shielded connection part 600. As a result, it becomes possible to obtain stable insulation properties for the cable connection structure 20.

[0078] Specifically, the shielding connection part 600 of this embodiment includes, for example, a current collecting plate 620 and a band 660 .

[0079] The current collector plate 620 contains a metal, such as copper or aluminum.

[0080] Connected to the current collecting plate 620 are a terminal 642 connected to an end of the cable metal shielding layer 150 (of the plurality of wire shields 152), and a terminal 644 connected to an end of the metal wire 190. The terminals 642 and 644 are fastened to the current collecting plate 620 by bolts 652 and 654, respectively.

[0081] In this embodiment, current collector 620 has, for example, a shape that follows the outer circumferential surface of spacer 500 (a shape close to the outer circumferential surface). Specifically, current collector 620 has a polygonal or semicircular arc shape when viewed in the surface direction. This allows current collector 620 to stably approach (contact) spacer 500 along the outer circumferential surface of spacer 500. Here, current collector 620 has, for example, a shape obtained by dividing an octagon in half. Because current collector 620 has a polygonal cross-sectional shape in this manner, terminals 642 and 644 can be stably connected to the flat surface of current collector 620.

[0082] The current collecting plate 620 is fixed to the spacer 500. This makes it possible to improve the structural stability around the shielding connection part 600.

[0083] Specifically, the current collector plate 620 is placed on, for example, the outer peripheral surface of the spacer 500. In other words, the current collector plate 620 is in contact with the outer peripheral surface of the spacer 500 in the radial direction of the conductor 110.

[0084] Furthermore, the current collector plate 620 has holes (reference numerals not shown) through which bands 660 are inserted, for example, near both ends of the current collector plate 620 in the longitudinal direction, and is fixed to the spacer 500 by the bands 660 .

[0085] Band 660 is configured as, for example, a strip-like or string-like member that fastens current collecting plate 620 to the outer circumferential surface of spacer 500. Examples of materials for band 660 include resin materials such as nylon, and metal materials such as stainless steel or copper. Band 660 may be, for example, Insulock (registered trademark). By using such band 660, current collecting plate 620 can be stably fixed to spacer 500.

[0086] In this embodiment, current collecting plate 620 is fixed to, for example, cylindrical portion 540 of spacer 500. This allows current collecting plate 620 to be easily and stably fastened to cylindrical portion 540 by band 660. By fastening band 660 to cylindrical portion 540 that does not have an inclination, the fastening force of band 660 can prevent current collecting plate 620 from shifting in position.

[0087] In this embodiment, the wire shield 152 of the above-described cable metal shielding layer 150 is connected to the current collecting plate 620 with the tip of the wire shield 152 facing the tip of the conductor 110 and in a loosened state relative to the axial direction of the conductor 110. By not bending the wire shield 152 in the direction opposite to the tip of the conductor 110 in the axial direction (at an angle close to 180°), damage to the exposed portion of the cable outer semiconductive layer 140 due to the bending of the wire shield 152 can be suppressed. Furthermore, by connecting the wire shield 152 to the current collecting plate 620 in a loosened state, it is possible to suppress displacement of the current collecting plate 620 even when a force pulling the wire shield 152 toward the cable sheath 160 is applied.

[0088] In this embodiment, the area of ​​the cross section of the current collecting plate 620 perpendicular to the direction from the connection point of the metal wire 190 toward the connection point of the cable metal shielding layer 150 (= the width in the short direction of the current collecting plate 620 × the thickness) is, for example, equal to or greater than the total area of ​​the cross sections perpendicular to the axial direction of the multiple wire shields 152 included in the cable metal shielding layer 150. This makes it possible to prevent the current collecting plate 620 from having a higher resistance than the cable metal shielding layer 150. As a result, it is possible to stably ensure conduction through the current collecting plate 620 between the cable metal shielding layer 150 and the metal wire 190.

[0089] (2-3) Shielding structure As shown in Figures 2, 4 and 5, the cable connection structure 20 further includes, for example, a semiconductive tape layer 480, a first shielding layer 410 (bold dotted line), and a second shielding layer 420 (bold dotted line) as an electrical shielding structure.

[0090] (semiconductive tape layer) The semiconductive tape layer 480 is formed, for example, by wrapping a semiconductive tape between the spacer 500 and the power cable 100 so as to cover the outer periphery of the exposed portion of the cable outer semiconductive layer 140 of the power cable 100.

[0091] (1st shielding layer) 2 and 4 , in this embodiment, the first shielding layer 410 is provided so as to continuously cover, for example, the outer periphery of the exposed portion of the cable outer semiconductive layer 140 of the first power cable 100a, the outer periphery of the spacer 500, and the outer periphery of the outer semiconductive layer 380 of the insulating unit 300. The first shielding layer 410 is made of, for example, copper mesh tape. The first shielding layer 410 electrically shields the area close to the first power cable 100a and can reliably connect the cable metal shielding layer 150 of the first power cable 100a and the outer semiconductive layer 380 of the insulating unit 300.

[0092] (2nd shielding layer) 2 and 5 , in this embodiment, the second shielding layer 420 is provided, for example, between the spacer 500 and the second power cable 100b, so as to cover the outer periphery of the exposed portion of the cable outer semiconductive layer 140 of the second power cable 100b, and is connected to the stress cone portion 360 of the insulation unit 300. The second shielding layer 420 is provided, for example, on the outer periphery of the semiconductive tape layer 480. The second shielding layer 420 is, for example, made of copper mesh tape, similar to the first shielding layer 410. The second shielding layer 420 electrically shields the area close to the second power cable 100b and reliably connects the cable metal shielding layer 150 of the second power cable 100b to the stress cone portion 360 of the insulation unit 300.

[0093] (2-4) Protection part 2, 4, and 5, in this embodiment, the protective part 400 that protects the insulating unit 300, the spacer 500, and the outside of the pair of power cables 100 is configured, for example, by multiple layers. Specifically, the protective part 400 has, for example, an inner protective layer 430 and a water-blocking heat-shrinkable tube layer 450.

[0094] The inner protective layer 430 has, for example, insulating properties and is provided so as to continuously cover the outer periphery of an area including, in order from the area close to the first power cable 100a to the area close to the second power cable 100b, the metal wire 190, the shielded connection 600 connecting the cable metal shielding layer 150 of the first power cable 100a, the first spacer 500a, the insulating unit 300, the second spacer 500b, the shielded connection 600 connecting the cable metal shielding layer 150 of the second power cable 100b, and the metal wire 190. The inner protective layer 430 has, for example, insulating self-fusing tape and is provided by wrapping the self-fusing tape. Note that multiple inner protective layers 430 may be provided. Such an inner protective layer 430 ensures insulation in the outer portion of the cable connection structure 20.

[0095] The water-proof heat-shrinkable tubing layer 450 is formed, for example, from a heat-shrinkable tubing having a metal water-proof layer and a resin layer. The water-proof heat-shrinkable tubing layer 450 is provided, for example, so as to continuously cover the entire area including the inner protective layer 430. By covering the entire cable connection structure 20 with the water-proof heat-shrinkable tubing layer 450 in this way, external damage to the cable connection structure 20 can be suppressed and the shape stability and water-proofness of the cable connection structure 20 can be ensured.

[0096] (3) Manufacturing method of cable connection structure (manufacturing method of linked power cables, cable connection method) Next, a method for manufacturing the cable connection structure 20 according to this embodiment will be described with reference to FIGS. 1 to 6B.

[0097] The manufacturing method of the cable connection structure 20 of this embodiment includes, for example, a preparation process S10, a conductor connection process S20, an insulating unit arrangement process S30, an insulating unit external formation process S40, a shielding connection process S50, and a protective portion formation process S60.

[0098] (S10: Preparation process) First, the layer components of the pair of power cables 100, the sleeve 200, the insulating unit 300, the spacer 500, and the protective part 400 that constitute the cable connection structure 20 are prepared.

[0099] For example, in a factory, the insulating unit 300 is supported by either the vertical first end face 390a or the second end face 390b of the insulating unit 300, and an expandable pipe is hydraulically inserted into the hollow portion of the insulating unit 300. This expands the diameter of the insulating unit 300.

[0100] Next, for example, at the installation site of the power cables 100, the pair of power cables 100 are stripped stepwise in the axial direction from one end of each cable, thereby exposing the conductor 110, the cable insulating layer 130, the cable outer semiconductive layer 140, and the cable sheath 160 in this order from the tip of the power cable 100.

[0101] After preparing the components that make up the cable connection structure 20, the power cable 100 is passed through the insulating unit 300, and the insulating unit 300 is set aside at a predetermined position on the power cable 100.

[0102] (S20: Conductor connection process) Once the preparation step S10 is complete, the pair of power cables 100 are butted together in the sleeve 200 with the axes of the conductors 110 aligned. After the pair of power cables 100 are butted together, the conductors 110 of the pair of power cables 100 are compression-connected by the sleeve 200.

[0103] Alternatively, a semiconductive tape may be wound around the pair of cable insulating layers 130 so as to fill the space between them.

[0104] (S30: Insulation unit placement process) After the conductor connecting step S20 is completed, the insulating unit 300, which ensures insulation around the sleeve 200, is provided so as to cover the outer periphery of the region including the sleeve 200. Specifically, the insulating unit 300, whose diameter has been expanded by the diameter expansion pipe, is moved to a position where it overlaps with the sleeve 200. Once the insulating unit 300 is placed in a predetermined position, the diameter expansion pipe is gradually pulled out from the insulating unit 300, gradually reducing the diameter of the insulating unit 300 in the axial direction. In this way, the insulating unit 300 is positioned so as to cover the outer periphery of the sleeve 200 and a portion of the outer periphery of each of the pair of power cables 100.

[0105] (S40: Insulation unit exterior forming process) After the insulating unit 300 is placed, the semiconductive tape layer 480, the second shielding layer 420, the spacer 500, and the first shielding layer 410 are formed as portions outside the insulating unit 300.

[0106] A semiconductive tape layer 480 is formed by winding a semiconductive tape around the axially outer side of the insulating unit 300 so as to cover the outer periphery of the exposed portion of the cable outer semiconductive layer 140 of the power cable 100 .

[0107] After the semiconductive tape layer 480 is formed, the second shielding layer 420 is formed to cover the outer periphery of the exposed portion of the cable outer semiconductive layer 140 of the second power cable 100b and the outer periphery of the semiconductive tape layer 480 provided on the second power cable 100b. The second shielding layer 420 is connected to the stress cone portion 360 of the insulation unit 300.

[0108] After the second shielding layer 420 is formed, a spacer 500 whose diameter gradually decreases in the direction away from the axial end of the insulating unit along the conductor 110 is placed so as to surround the outer periphery of each of the pair of power cables 100 and contact the axial end of the insulating unit 300.

[0109] After each spacer 500 is positioned, a first shielding layer 410 is formed to continuously cover the outer periphery of the exposed portion of the cable outer semiconductive layer 140 of the first power cable 100a, the outer periphery of the spacer 500, and the outer periphery of the outer semiconductive layer 380 of the insulating unit 300.

[0110] (S50: Shielding connection process) After the insulating unit external formation process S40 is completed, the metal wire 190 that is grounded to the outside or that connects between the cable metal shielding layers 150 of the pair of power cables 100 is connected to each cable metal shielding layer 150 of the pair of power cables 100 by the shielding connection part 600.

[0111] In this embodiment, the shielding connection part 600 is fixed to the spacer 500. Specifically, the current collecting plate 620 is placed on the outer circumferential surface of the cylindrical part 540 of the spacer 500. In this state, the current collecting plate 620 is fastened to the cylindrical part 540 of the spacer 500 using a band 660.

[0112] After the current collecting plate 620 is fixed to the spacer 500, terminals 642 are connected by compression to the ends of the multiple wire shields 152 of the cable metal shielding layer 150, and the terminals 642 are fastened to the current collecting plate 620 by bolts 652. Furthermore, terminals 644 are connected by compression to the ends of the metal wires 190, and the terminals 644 are fastened to the current collecting plate 620 by bolts 654.

[0113] After the terminals 642 and 644 are fastened to the current collector plate 620, the current collector plate 620 may be fixed to the spacer 500.

[0114] (S60: Protective part forming process) After the shielding connection step S50 is completed, the protective portion 400 is formed.

[0115] Specifically, the self-fusing tape is wrapped around the outer periphery of a predetermined region including the insulating unit 300. In this way, the inner protective layer 430 is formed so as to cover the outer periphery of the region including, in this order, the metal wire 190, the shielded connection 600 connecting the cable metal shielding layer 150 of the first power cable 100a, the first spacer 500a, the insulating unit 300, the second spacer 500b, the shielded connection 600 connecting the cable metal shielding layer 150 of the second power cable 100b, and the metal wire 190, from the region close to the first power cable 100a to the region close to the second power cable 100b.

[0116] After the inner protective layer 430 is formed, a water-impermeable heat-shrinkable tube is placed around the outer periphery of a predetermined area including the insulating unit 300. After the water-impermeable heat-shrinkable tube is placed in the predetermined position as described above, the water-impermeable heat-shrinkable tube is heat-shrunk. This forms a water-impermeable heat-shrinkable tube layer 450 that covers the entire area of ​​the cable connection structure 20.

[0117] In this manner, the cable connection structure 20 and the connecting power cable 10 of this embodiment are manufactured.

[0118] (4) Summary of this embodiment According to this embodiment, one or more of the following effects are achieved.

[0119] (a) In this embodiment, the shielding connection 600 connects the metal wire 190, which is a ground wire or a braided wire, to the cable metal shielding layer 150. The shielding connection 600 is fixed to the spacer 500.

[0120] By fixing the shielding connection part 600 to the spacer 500, a series of operations related to connecting the metal wire 190 and the wire shield 152 can be performed easily and stably. This reduces the occurrence of individual differences between workers and improves the reproducibility of the connection operations. As a result, it is possible to make the structure connecting the metal wire 190 and the wire shield 152 of the cable metal shielding layer 150 uniform.

[0121] By fixing the shielding connection 600 to the spacer 500, it is possible to prevent the terminal 642 connected to the end of the cable metal shielding layer 150 and the terminal 644 connected to the end of the metal wire 190 in the shielding connection 600 from coming into contact with the exposed portion of the cable outer semiconductive layer 140. Furthermore, it is possible to eliminate the need to bend the wire shield 152 of the cable metal shielding layer 150 in a direction away from the axial tip of the conductor 110. This makes it possible to prevent the bent portion of the wire shield 152 from coming into contact with the exposed portion of the cable outer semiconductive layer 140 due to the bending of the wire shield 152. As a result, it is possible to prevent external damage to the exposed portion of the cable outer semiconductive layer 140.

[0122] By fixing the shielding connection part 600 to the spacer 500, even if the wire shield 152 of the cable metal shielding layer 150 moves due to heat generation during operation, the range of movement of the wire shield 152 near the shielding connection part 600 can be kept within a certain range. This makes it possible to suppress excessive disturbance of the wire shield 152.

[0123] By fixing the shielding connection 600 to the spacer 500, i.e., by stabilizing the structure around the shielding connection 600, the self-fusing tape serving as the inner protective layer 430 can be easily and stably wound around the outer periphery of the shielding connection 600. This makes it possible to suppress variations in the wrapping of the self-fusing tape around the inner protective layer 430. In other words, it is possible to suppress the occurrence of areas where the self-fusing tape is thin. As a result, it is possible to stabilize the electrical characteristics.

[0124] As a result, in this embodiment, stable insulation properties of the cable connection structure 20 can be obtained.

[0125] (b) In this embodiment, the shielding connection 600 is fixed to the spacer 500, which is configured as a molded body. That is, the spacer 500 to which the shielding connection 600 is fixed is in a state in which its outer shape is predetermined as a molded body. This allows the shielding connection 600 to be stably fixed in a fixed position on the spacer 500. As a result, the structural stability of the area around the shielding connection 600 can be improved.

[0126] (c) In this embodiment, the shielding connection 600 has a current collecting plate 620 to which a terminal 642 connected to an end of the cable metal shielding layer 150 and a terminal 644 connected to an end of the metal wire 190 are connected. This allows the cable metal shielding layer 150 and the metal wire 190 to be physically connected to the current collecting plate 620, and also allows the cable metal shielding layer 150 and the metal wire 190 to be electrically connected through the current collecting plate 620. In other words, the functions required for the shielding connection 600 can be integrated into the current collecting plate 620. By fixing the current collecting plate 620, which integrates the functions of the shielding connection 600, to the spacer 500 in this way, the structural stability around the shielding connection 600 can be further improved.

[0127] (d) In this embodiment, current collecting plate 620 is placed on the outer peripheral surface of spacer 500. This allows current collecting plate 620 to be easily and stably attached to spacer 500 while preventing contact between current collecting plate 620 and accessories and power cable 100 using spacer 500.

[0128] (e) In this embodiment, the shielding connection part 600 has a band 660 that fastens the current collecting plate 620 to the outer peripheral surface of the spacer 500. By fastening the current collecting plate 620 to the outer peripheral surface of the spacer 500 with the band 660, the current collecting plate 620 can be stably fixed to the spacer 500.

[0129] Furthermore, when the spacer 500 is divided into multiple pieces, tightening the inner spacer 500 with the band 660 can prevent the divided spacers 500 from coming off. By stabilizing the shape of the spacer 500 in this way, the structural stability in the vicinity of the shielded connection part 600 can be further improved.

[0130] (5) Modification of this embodiment The above-described embodiment can be modified as necessary as shown in the following variations. Only elements different from the above-described embodiment will be described below, and elements that are substantially the same as those described in the above-described embodiment will be assigned the same reference numerals and descriptions thereof will be omitted.

[0131] (5-1) Variation 1 Modification 1 will be described with reference to Fig. 7. Fig. 7 shows only the current collector plate 620 and the spacer 500 of the shielding connection portion 600.

[0132] 7 , in Modification 1, spacer 500 has, for example, a so-called snap-fit ​​structure. Specifically, current collecting plate 620 has, for example, engagement hole 628. Meanwhile, spacer 500 has, for example, engagement portion 590. Engagement portion 590 of spacer 500 is configured to engage with engagement hole 628 of current collecting plate 620, thereby fixing current collecting plate 620 to spacer 500.

[0133] In the first modification, a pair of engagement holes 628 are provided in the current collector plate 620. The pair of engagement holes 628 are provided near both ends of the current collector plate 620 in the longitudinal direction. On the other hand, a pair of engagement portions 590 are provided in the spacer 500. The pair of engagement portions 590 are arranged so as to engage with the pair of engagement holes 628 of the current collector plate 620 when the current collector plate 620 is placed on the spacer 500.

[0134] In the first modification, an engagement portion 590 is provided on the cylindrical portion 540 of the spacer 500. This allows the engagement portion 590 to be engaged with the current collector plate 620 in a stable manner.

[0135] (Summary of Variation 1) In the first modification, the spacer 500 has the engaging portion 590 having a snap-fit ​​structure, so that the current collecting plate 620 can be easily fixed to the spacer 500.

[0136] (5-2) Variation 2 Modification 2 will be described with reference to Fig. 8. Fig. 8 shows only the current collector plate 620 and the spacer 500 of the shielding connection portion 600.

[0137] As shown in FIG. 8, in the second modification, the current collector plate 620 is integrally formed with the spacer 500, for example.

[0138] In the second modification, the current collector plate 620 is embedded in the cylindrical portion 540 of the spacer 500. This makes it possible to prevent the current collector plate 620 from shifting in position when the spacer 500 is formed.

[0139] (Summary of Variation 2) In the second modification, current collector plate 620 is integrally formed with spacer 500, thereby reliably preventing displacement of current collector plate 620. This further improves the structural stability in the vicinity of shielding connection part 600.

[0140] In the second modification, the current collecting plate 620 is integrally molded with the spacer 500, thereby reducing the number of parts and eliminating the need to attach the current collecting plate 620 to the spacer 500. This simplifies the work involved in manufacturing the cable connection structure 20 on-site.

[0141] <Other Embodiments of the Present Disclosure> Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments and can be modified in various ways without departing from the spirit of the present disclosure.

[0142] In the above embodiment, the description has been given of the linked power cable 10 having one cable connection structure 20. However, the linked power cable 10 may have a plurality of cable connection structures 20.

[0143] In the above embodiment, the cable connection structure 20 is described as being applied to three-phase AC. However, the cable connection structure 20 may also be applied to DC.

[0144] In the above embodiment, the spacer 500 contains a thermoplastic resin and has a hollow structure, but the present disclosure is not limited to this. The spacer 500 may contain, for example, rubber and have a solid structure. This can improve the rigidity of the area around the shielding connection part 600 fixed to the spacer 500.

[0145] In the above-described embodiment, the spacer 500 has the conical portion 520 and the cylindrical portion 540, but the present disclosure is not limited to this case. If the spacer 500 is configured as a molded body, the spacer 500 may have, for example, only the conical portion 520. However, as described above, if the spacer 500 has the conical portion 520 and the cylindrical portion 540, the shielding connection portion 600 can be more stably fixed to the cylindrical portion 540.

[0146] In the above embodiment, the cable connection structure 20 is described as being applied to an insulated connection portion, but the cable connection structure 20 may also be applied to a normal connection portion in which the insulating unit 300 does not have a separation portion SP. In this case, a metal wire 190 as a braided wire is provided to connect between the cable metal shielding layers 150 of the pair of power cables 100. In the shielded connection portion 600, the metal wire 190 as a braided wire and each of the cable metal shielding layers 150 of the pair of power cables 100 are connected.

[0147] In the above-described embodiment, the case where the outermost layer of the protective part 400 is the water-blocking heat-shrinkable tube layer 450 has been described, but the present disclosure is not limited to this case. The outermost layer of the protective part 400 may be, for example, a metal pipe (copper pipe).

[0148] <Additional Notes> The following additionally describes aspects of the present disclosure.

[0149] (Appendix 1) a pair of power cables each having a conductor, a cable insulating layer, and a cable metal shielding layer in this order from a central axis of the conductor toward an outer periphery; a cylindrical sleeve connecting the conductors of the pair of power cables; a cylindrical insulating unit provided to cover an outer periphery of an area including the sleeve and to ensure insulation around the sleeve; a spacer surrounding the outer periphery of each of the pair of power cables and provided to contact an end of the insulating unit in the axial direction, the spacer gradually decreasing in diameter in a direction away from the end of the insulating unit along the conductor; a metal wire disposed outside the insulating unit and grounded to the outside or connecting the cable metal shielding layers of the pair of power cables; a shielding connection portion connecting the cable metal shielding layer and the metal wire of each of the pair of power cables; Equipped with The shielding connection portion is fixed to the spacer. Cable connection structure.

[0150] (Appendix 2) The spacer is configured as a molded body. 1. A cable connection structure as described in Appendix 1.

[0151] (Appendix 3) the shield connection portion includes a metal and has a current collector plate to which a terminal connected to an end of the cable metal shielding layer and a terminal connected to an end of the metal wire are connected, The current collector plate is fixed to the spacer. 1. A cable connection structure according to claim 1 or 2.

[0152] (Appendix 4) The current collector plate is placed on the outer peripheral surface of the spacer. 1. A cable connection structure as described in Appendix 3.

[0153] (Appendix 5) The current collector plate has a shape that follows the outer peripheral surface of the spacer. 1. A cable connection structure according to claim 3 or 4.

[0154] (Appendix 6) The shield connection portion has a band that fastens the current collector plate to the outer circumferential surface of the spacer. 6. A cable connection structure according to any one of Supplementary Note 3 to Supplementary Note 5.

[0155] (Appendix 7) The spacer has an engagement portion that engages with the current collector plate to fix the current collector plate to the spacer. 6. A cable connection structure according to any one of Supplementary Note 3 to Supplementary Note 5.

[0156] (Appendix 8) The current collector plate is integrally formed with the spacer. 1. A cable connection structure as described in Appendix 3.

[0157] (Appendix 9) The spacer is a conical portion whose diameter gradually decreases in a direction away from the end of the insulating unit along the conductor; a cylindrical portion connected to the reduced diameter end of the conical portion and extending at a constant diameter in a direction away from the conical portion; and The current collecting plate is fixed to the cylindrical portion of the spacer. 9. A cable connection structure according to any one of Supplementary Note 3 to Supplementary Note 8.

[0158] (Appendix 10) the cable metal shielding layer includes a wire shield; The wire shield is connected to the current collector plate with the tip of the wire shield facing the tip of the conductor and loosened in the axial direction of the conductor. 10. A cable connection structure according to any one of Supplementary Note 3 to Supplementary Note 9.

[0159] (Appendix 11) In the current collecting plate, the area of ​​a cross section perpendicular to a direction from the connection point of the metal wire toward the connection point of the cable metal shielding layer is equal to or greater than the total area of ​​the cross sections perpendicular to the axial direction of the plurality of wire shields included in the cable metal shielding layer. 11. A cable connection structure according to any one of claims 3 to 10.

[0160] (Appendix 12) preparing a pair of power cables, each having a conductor, a cable insulating layer, and a cable metallic shielding layer in this order from a central axis of the conductor outward; connecting the conductors of the pair of power cables with a tubular sleeve; a step of disposing an insulating unit that ensures insulation around the sleeve so as to cover the outer periphery of an area including the sleeve; a step of disposing a spacer whose diameter gradually decreases in a direction away from an axial end of the insulating unit along the conductor, so as to surround an outer periphery of the pair of power cables and to contact the end of the insulating unit; a step of connecting a metal wire that is grounded externally or that connects between the cable metal shielding layers of the pair of power cables to each of the cable metal shielding layers of the pair of power cables by a shielding connection part; Equipped with In the step of connecting using the shielded connecting portion, The shielding connection is fixed to the spacer. A method for manufacturing a cable connection structure. [Explanation of symbols]

[0161] 10 Connecting power cable 20 Cable connection structure 100 Power Cable 100a First power cable 100b Second power cable 110 Conductor 120 Cable inner semiconductive layer 130 Cable insulation layer 140 Cable outer semiconductive layer 150 Cable metal shielding layer 152 Wire Shield 160 Cable sheath 190 Metal Wire 200 sleeves 300 Isolation Unit 320 Internal semiconductive layer 340 Insulation Unit Insulation Layer 360 Stress Cone Section 380 outer semiconductive layer 390a 1st end face 390b 2nd end face 400 Protection Department 410 1st shielding layer 420 2nd shielding layer 430 Inner protective layer 450 Water-resistant heat-shrinkable tubing layer 480 semi-conductive tape layer 500 spacer 500a First spacer 500b Second spacer 512 1st division 514 Second division 520 Cone 540 Cylindrical part 560 Gripping part 580 Ribs 590 Engagement part 600 Shielding joint 620 Current collector plate 628 Engagement hole 642 terminals 644 terminals 650 Current collector plate 652 volts 654 volts 660 band CA center axis SP separation section

Claims

1. a pair of power cables each having a conductor, a cable insulating layer, and a cable metal shielding layer in this order from a central axis of the conductor toward an outer periphery; a cylindrical sleeve connecting the conductors of the pair of power cables; a cylindrical insulating unit provided to cover an outer periphery of an area including the sleeve and to ensure insulation around the sleeve; a spacer surrounding the outer periphery of each of the pair of power cables and provided to contact an end of the insulating unit in the axial direction, the spacer gradually decreasing in diameter in a direction away from the end of the insulating unit along the conductor; a metal wire disposed outside the insulating unit and grounded to the outside or connecting the cable metal shielding layers of the pair of power cables; a shielding connection portion connecting the cable metal shielding layer and the metal wire of each of the pair of power cables; Equipped with The shielding connection portion is fixed to the spacer. Cable connection structure.

2. The spacer is configured as a molded body. The cable connection structure according to claim 1 .

3. the shield connection portion includes a metal and has a current collector plate to which a terminal connected to an end of the cable metal shielding layer and a terminal connected to an end of the metal wire are connected, The current collector plate is fixed to the spacer. The cable connection structure according to claim 1 or 2.

4. The current collector plate is placed on the outer peripheral surface of the spacer. The cable connection structure according to claim 3 .

5. The shield connection portion has a band that fastens the current collector plate to the outer circumferential surface of the spacer. The cable connection structure according to claim 3 .

6. The spacer has an engagement portion that engages with the current collector plate to fix the current collector plate to the spacer. The cable connection structure according to claim 3 .

7. The current collector plate is integrally formed with the spacer. The cable connection structure according to claim 3 .

8. The spacer is a conical portion whose diameter gradually decreases in a direction away from the end of the insulating unit along the conductor; a cylindrical portion connected to the reduced diameter end of the conical portion and extending at a constant diameter in a direction away from the conical portion; and The current collecting plate is fixed to the cylindrical portion of the spacer. The cable connection structure according to claim 3 .

9. In the current collecting plate, the area of ​​a cross section perpendicular to a direction from the connection point of the metal wire toward the connection point of the cable metal shielding layer is equal to or greater than the total area of ​​the cross sections perpendicular to the axial direction of the plurality of wire shields included in the cable metal shielding layer. The cable connection structure according to claim 3 .

10. A cable connection structure according to claim 1 or 2 is provided. Interlocking power cable.

11. preparing a pair of power cables, each having a conductor, a cable insulating layer, and a cable metallic shielding layer in this order from a central axis of the conductor outward; connecting the conductors of the pair of power cables with a tubular sleeve; a step of disposing an insulating unit that ensures insulation around the sleeve so as to cover the outer periphery of an area including the sleeve; a step of disposing a spacer whose diameter gradually decreases in a direction away from an axial end of the insulating unit along the conductor, so as to surround an outer periphery of the pair of power cables and to contact the end of the insulating unit; a step of connecting a metal wire that is grounded externally or that connects between the cable metal shielding layers of the pair of power cables to each of the cable metal shielding layers of the pair of power cables by a shielding connection part; Equipped with In the step of connecting using the shielded connecting portion, The shielding connection is fixed to the spacer. A method for manufacturing a cable connection structure.

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