Cable intermediate connection

Abstract

To provide a cable intermediate connection part capable of ensuring a predetermined insulation performance even if a compression length of a conductor connection pipe is shortened by improving a heat dissipation property from a conductor connection part to an insulation unit.SOLUTION: A cable intermediate connection part is a prefabrication type cable intermediate connection part comprising an insulation unit including an internal electrode and a cable terminal part in which cable conductors of two power cables are connected with each other by a conductor connection part and stored in the insulation unit. The conductor connection part includes: a conductor connection pipe to which the cable conductor is compression-connected; an intermediate sleeve which extends so as to cover a compressed portion of the conductor connection pipe and is electrically and mechanically connected with a non-compressed portion of the conductor connection pipe; and a polyhedral contactor which is disposed on an outer peripheral surface of the intermediate sleeve. The cable conductor and the internal electrode are mechanically connected via the conductor connection pipe and the polyhedral contactor.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a cable intermediate connection part for connecting power cables to each other.

Background Art

[0002] Conventionally, as a cable intermediate connection part for connecting two power cables (for example, CV cables), a prefabricated type cable intermediate connection part (also called a prefabricated joint) is known, in which the cable conductors of the two power cables are connected by a conductor connection pipe to form a conductor connection part, and this conductor connection part is inserted into an insulating unit and assembled (see, for example, Patent Document 1).

[0003] In a prefabricated type cable intermediate connection part, the cable conductor of a power cable is inserted into a conductor connection pipe and connected, for example, by compression. Also, a ring-shaped connection part (hereinafter referred to as a "conductor ring") is attached to a non-compressed part substantially at the center in the axial direction (longitudinal direction) of the conductor connection pipe, and the internal electrode of the insulating unit and the conductor connection pipe are electrically and mechanically connected via the conductor ring.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in order to shorten the length of the insulating unit, it is preferable that the compression length of the conductor connection pipe is short. However, if the compression length of the conductor connection pipe is shortened, the contact resistance between the conductor connection pipe and the cable conductor increases, so that the heat generation during energization increases. This heat generation is transmitted to the internal electrode of the insulating unit via the conductor ring, but when the amount of heat generation is larger than the amount of heat dissipation by heat transfer, the cable insulator tends to soften and deform, and there is a risk of significantly impairing the stability of the insulation performance of the cable intermediate connection part.

[0006] The purpose of this disclosure is to provide a cable intermediate connection part that improves heat dissipation from the conductor connection part to the insulation unit and ensures predetermined insulation performance even when the compression length of the conductor connection tube is shortened. [Means for solving the problem]

[0007] The cable intermediate connection part relating to this disclosure is An insulating unit having internal electrodes, The cable conductors of the two power cables are connected to each other by a conductor connector, and the cable terminal portion is housed in the insulating unit, A prefabricated cable intermediate connection section comprising: The aforementioned conductor connection part is The cable conductor is compressed and connected to a conductor connecting tube, An intermediate sleeve extends to cover the compressed portion of the conductor connecting pipe and is electrically and mechanically connected to the non-compressed portion of the conductor connecting pipe, The intermediate sleeve has a multifaceted contactor arranged on its outer circumferential surface, The cable conductor and the internal electrode are mechanically connected via the conductor connecting tube, the intermediate sleeve, and the multifaceted contact. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide a cable intermediate connection part that improves heat dissipation from the conductor connection part to the insulation unit and ensures predetermined insulation performance even when the compression length of the conductor connection tube is shortened. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a one-sided cross-sectional view showing the intermediate cable connection portion according to the embodiment. [Figure 2] Figure 2 is a one-sided cross-sectional view showing the conductor connection portion of the intermediate cable connection. [Figure 3] Figures 3A and 3B are external perspective views and cross-sectional views showing the conductor connection section of the intermediate cable connection. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0011] Figure 1 is a one-sided cross-sectional view showing a cable intermediate connection section 1 according to one embodiment of the present disclosure. Note that in Figure 1, hatching is applied only to the cross-sections of the components of the insulating unit 10.

[0012] As shown in Figure 1, the cable intermediate connection section 1 comprises an insulating unit 10 and a cable terminal section 50. The cable intermediate connection section 1 is a prefabricated cable intermediate connection section that connects two power cables 51A and 51B.

[0013] In the following explanation, at the cable terminal 50, the side that is inserted into the insulation unit 10 of each power cable 51A, 51B will be referred to as the "tip side," and the opposite side as the "rear end side." That is, at the cable intermediate connection 1, the central side of the cable intermediate connection 1 will be referred to as the "tip side," and both ends will be referred to as the "rear end sides."

[0014] As shown in Figure 1, the cable terminal 50 is constructed by attaching connecting components, including a conductor connector 52, a stress cone 53, a compression device 54, and a cable protection fitting 55, to the respective ends of the power cables 51A and 51B.

[0015] The power cables 51A and 51B are ultra-high voltage (e.g., 345kV class) power cables insulated with, for example, rubber or plastic. The power cables 51A and 51B each have, in order from the inside out, a cable conductor 511, an internal semiconducting layer (no symbol), a cable insulator 512, an external semiconducting layer 513, a cable shielding layer (no symbol), and a cable sheath (no symbol). At the cable terminal 50, each layer is exposed by stripping the ends of the power cables 51A and 51B in predetermined lengths.

[0016] The cable conductors 511, 511 are connected by a conductor connection part 52. The cable conductors 511, 511 are electrically connected to the internal electrode 11 of the insulating unit 10 via the conductor connection part 52. The specific configuration of the conductor connection part 52 will be described later.

[0017] The stress cone 53 is formed in a spindle shape and has an insulating part (reference numeral omitted) on the tip side and a conductive part (reference numeral omitted) on the rear end side. The insulating part is formed in a cylindrical shape from an insulating rubber material such as EP rubber, for example, and the conductive part is formed in a cylindrical shape from a semiconductive rubber material such as semiconductive EP rubber, for example. The insulating part and the conductive part are integrally formed by mold molding.

[0018] The rear end part (conductive part) of the stress cone 53 is connected to the cable outer semiconductive layer 513 of the power cables 51A, 51B. "Connected to the cable outer semiconductive layer 513 of the power cables 51A, 51B" includes any case where it is directly connected to the cable outer semiconductive layer 513 as long as it has a predetermined performance as a cable intermediate connection part, and a case where it is connected via an externally regenerated semiconductive layer formed with a mold or conductive paint at the end of the cable outer semiconductive layer 513. The tip part (insulating part) of the stress cone 53 has a shape corresponding to the cable housing part of the insulating unit 10. A compression device 54 and a cable protection fitting 55 are attached to the rear end side of the stress cone 53.

[0019] The compression device 54 includes, for example, a push pipe 541 that abuts against the stress cone 53, a coil spring 542 that biases the push pipe 541 toward the stress cone 53, a push fitting 543 that holds the push pipe 541 and the coil spring 542, a shaft 544 that is attached to the rear end side of the push fitting 543 and inserted into the coil spring 542, a washer 545 that penetrates the rear end side of the shaft 544 and is fixed with a nut, and holds the coil spring 542 with the front end face and the rear end face of the push fitting 543, and a tension bolt 546 whose rear end side penetrates the washer 545 and whose front end side is bolted to the insulating unit 10 side.

[0020] As shown in FIG. 1, the insulation unit 10 includes an internal electrode 11, a reinforcing insulator 12, a shielding portion 13, a protective tube 14, and the like. The internal electrode 11 and the reinforcing insulator 12 are integrally formed by, for example, mold molding.

[0021] The internal electrode 11 is formed of a conductive material suitable for energization, such as copper, aluminum, a copper alloy, or an aluminum alloy. The internal electrode 11 is electrically connected to the cable conductor 511 via the conductor connection portion 52.

[0022] At a predetermined position (for example, substantially in the center in the axial direction) on the inner peripheral surface of the internal electrode 11, a concave fitting groove 111 is provided along the circumferential direction. Further, on the inner peripheral surface of the internal electrode 11, insertion grooves (not shown) for communicating the fitting groove 111 with the internal space corresponding to the large-diameter portion of the intermediate sleeve 62 in the internal electrode 11 are provided at two positions in the circumferential direction so as to extend from the fitting groove 111 to the rear end side (right side in FIG. 2).

[0023] The reinforcing insulator 12 is formed of, for example, a hard plastic resin material having high mechanical strength (for example, epoxy resin or FRP). The reinforcing insulator 12 has a substantially cylindrical shape, and a cable terminal accommodating portion (not shown) is formed by the inner peripheral surface. The internal electrode 11 is disposed substantially at the center in the axial direction of the cable terminal accommodating portion.

[0024] The shielding portion 13 is formed on the outer peripheral surface of the reinforcing insulator 12, for example, by applying a conductive paint. The shielding portion 13 may be further formed by winding a semiconductive tape or a copper mesh tape (shielding mesh) around the surface of the conductive paint application layer.

[0025] The shielding portion 13 is electrically connected to the protective tube 14 and grounded. By providing the shielding portion 13, the internal electric field of the reinforcing insulator 12 is made uniform without electric field concentration between the internal electrode 11 and the shielding portion 13, and the electrical characteristics are stabilized.

[0026] The protective tube 14 is a metal member having a substantially cylindrical shape. The protective tube 14 is made of a metal material such as copper, brass, or aluminum. The protective tube 14 is positioned to cover the outer surface of the reinforcing insulator 12.

[0027] Figure 2 is a one-sided cross-sectional view showing the conductor connection portion 52 of the cable intermediate connection portion 1. Figures 3A and 3B are external perspective views and perspective cross-sectional views showing the conductor connection portion 52.

[0028] As shown in Figure 2 and other figures, in this embodiment, the conductor connection section 52 includes a conductor connection tube 61, an intermediate sleeve 62, and a multifaceted contact 63.

[0029] The conductor connecting tube 61 is made of a conductive material suitable for electrical conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy. The conductor connecting tube 61 has a cylindrical shape, and cable conductor housing portions 613 are formed on both sides in the axial direction.

[0030] The conductor connecting tube 61 and the cable conductors 511, 511 are electrically and mechanically connected by compressing them using a compression jig such as a compression die, with the cable conductors 511, 511 inserted into the cable conductor housing portion 613 of the conductor connecting tube 61. In the conductor connecting tube 61, the compressed portion (the portion where the cable conductor housing portion 613 is formed) is called the "compressed portion 611," and the portion approximately in the axial center sandwiched between the compressed portions 611 is called the "uncompressed portion 612."

[0031] The intermediate sleeve 62, like the conductor connecting pipe 61, is made of a conductive material suitable for electrical conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy. The intermediate sleeve 62 has a cylindrical shape that covers the outer surface of the conductor connecting pipe 61. The intermediate sleeve 62 extends, for example, to cover the portion of the conductor connecting pipe 61 from the uncompressible portion 612 to the compressible portions 611 on both sides. The intermediate sleeve 62 is electrically and mechanically connected to the uncompressible portion 612 of the conductor connecting pipe 61.

[0032] Furthermore, the intermediate sleeve 62 does not need to cover the entire compression section 611; it only needs to be long enough to accommodate the multifaceted contactor 63.

[0033] The intermediate sleeve 62 has contactor accommodating grooves 621 on its outer circumferential surface where the multifaceted contactor 63 is arranged. In this embodiment, four contactor accommodating grooves 621 are formed on the outer circumferential surface of the intermediate sleeve 62.

[0034] The intermediate sleeve 62 may be composed of multiple members divided in the circumferential direction. In this embodiment, the intermediate sleeve 62 is composed of a first intermediate sleeve 62A and a second intermediate sleeve 62B, which are divided into two parts in the circumferential direction (a so-called half-split structure).

[0035] Furthermore, the diameter of one side of the intermediate sleeve 62 in the axial direction (right side in the drawing) is larger than the diameter of the other side (left side in the drawing). A guide 66 is provided on the end face of the larger diameter side of the intermediate sleeve 62 to indicate the circumferential position of the bolt 64, which will be described later. The guide 66 is provided in a groove-like shape, for example, extending radially from the inside to the outside, at a position corresponding to the bolt 64. In this embodiment, the guide 66 is located at two locations on the same straight line: one on the first intermediate sleeve 62A and one on the second intermediate sleeve 62B.

[0036] The first intermediate sleeve 62A and the second intermediate sleeve 62B are each fixed to the outer circumferential surface of the conductor connecting pipe 61. In this embodiment, the first intermediate sleeve 62A and the second intermediate sleeve 62B are fixed to the non-compressible portion 612 using bolts 64 and 67. In this embodiment, the bolts 64 are provided at two locations in the circumferential direction approximately in the axial center of the intermediate sleeve 62 (one location on the first intermediate sleeve 62A and one location on the second intermediate sleeve 62B). The bolts 67 are provided at four locations in the intermediate sleeve 62, spaced apart from the bolts 64 in the same circumferential direction as the bolts 64 (two locations on the first intermediate sleeve 62A and two locations on the second intermediate sleeve 62B). The contact surfaces of the first intermediate sleeve 62A and the second intermediate sleeve 62B may be connected to each other, for example, by bolt fastening.

[0037] The multifaceted contact 63, like the conductor connecting tube 61 and the intermediate sleeve 62, is made of a conductive material suitable for electrical conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy. The multifaceted contact 63 is positioned on the outer circumferential surface of the intermediate sleeve 62 and is electrically and mechanically connected to the intermediate sleeve 62.

[0038] The multifaceted contactor 63 has a ring shape, for example, that fits into the contactor housing groove 621 of the intermediate sleeve 62. Compared to the case where the multifaceted contactors 63 are scattered in the circumferential direction on the outer surface of the intermediate sleeve 62, the contact area between the multifaceted contactor 63 and the internal electrode 11 can be increased.

[0039] The multifaceted contactor 63 may be composed of multiple members divided in the circumferential direction. In this case, the multifaceted contactor 63 can be easily attached to the outer circumferential surface of the intermediate sleeve 62.

[0040] In this embodiment, the polyfaceted contact 63, like the intermediate sleeve 62, is composed of a first polyfaceted contact 63A and a second polyfaceted contact 63B, which are divided into two parts in the circumferential direction. The first polyfaceted contact 63A and the second polyfaceted contact 63B are connected to each other to form a ring shape as a whole. Alternatively, the first polyfaceted contact 63A and the second polyfaceted contact 63B may not be connected to each other and may be directly fixed to the outer circumferential surface of the intermediate sleeve 62.

[0041] The multifaceted contacts 63 may be arranged at multiple locations in the axial direction on the outer circumferential surface of the intermediate sleeve 62. In this embodiment, the multifaceted contacts 63 are arranged in four contact housing grooves 621 provided on the outer circumferential surface of the intermediate sleeve 62. By arranging multiple multifaceted contacts 63 in the axial direction, the design freedom for increasing the contact area between the multifaceted contacts 63 and the internal electrodes 11 is increased.

[0042] The multi-faceted contactor 63 is composed of a multi-faceted contact type multi-ram band in which V-shaped spring pieces are arranged in the circumferential direction. For example, the "La-CUT / 0.25 / 0 (part number)" manufactured by Multi Contact Co., Ltd. can be used for the multi-faceted contactor 63.

[0043] The above-described configuration of the multifaceted contactor 63 is just one example, and other configurations can also be applied. For example, a coil spring can be used for the multifaceted contactor 63, which is formed by winding a conductive wire in a spiral shape, curving it, and connecting both ends of the wire to form a ring.

[0044] A thermal conductive layer 65 may be interposed at the interface between the conductor connecting tube 61 and the intermediate sleeve 62. The thermal conductive layer 65 is formed from a thermal interface material (TIM) having a high thermal conductivity of, for example, 0.8 to 6.5 W / (m·K). For the thermal conductive material, for example, heat dissipation silicone or a material in which a thermal conductive filler is compounded with a base resin such as silicone can be used. Depending on the surface roughness of the conductor connecting tube 61 or the intermediate sleeve 62, a void may be formed at the interface between the two. However, by interposing the thermal conductive layer 65, the void that would occur between the conductor connecting tube 61 and the intermediate sleeve 62 in the absence of the thermal conductive layer 65 can be filled with the thermal conductive layer 65, thereby improving heat dissipation.

[0045] In the assembly process of the cable intermediate connection section 1, after stripping the ends of the power cables 51A and 51B, the cable protection fitting 55, compression device 54, and stress cone 53 are inserted through the power cables 51A and 51B. In addition, the insulation unit 10 is inserted through one of the power cables 51A (or power cable 51B). With this in place, the cable conductors 511, 511 of the power cables 51A and 51B are inserted into the cable conductor housing section 613 of the conductor connection pipe 61, and the conductor connection pipe 61 is compressed and connected.

[0046] Next, an intermediate sleeve 62 is attached to the outer surface of the conductor connecting pipe 61, and a multi-faceted contactor 63 is attached to the outer surface of the intermediate sleeve 62. If the intermediate sleeve 62 and the multi-faceted contactor 63 are each composed of multiple members, the intermediate sleeve 62 and the multi-faceted contactor 63 can be easily attached after the conductor connecting pipe 61 has been compressed and connected to the cable conductors 511, 511.

[0047] In this embodiment, the intermediate sleeve 62 and the conductor connecting pipe 61 are fixed together with bolts 67 at a predetermined torque such that the heads of the bolts 67 do not protrude from the outer surface of the intermediate sleeve 62. That is, a groove for accommodating the heads of the bolts 67 is provided on the intermediate sleeve 62 side. In addition, the bolts 64 are provided such that their heads protrude radially outward from the outer surface of the intermediate sleeve 62. The protruding heads of the bolts 64 become projections on the intermediate sleeve 62.

[0048] Next, the insulating unit 10 and the cable terminal portion 50 are moved relative to each other in the axial direction to position them so that the internal electrode 11 of the insulating unit 10 and the multifaceted contact 63 of the cable terminal portion 50 are electrically and mechanically connected. At this time, since a guide 66 indicating the circumferential position of the bolt 64 (projection) is provided on the end face of the large diameter side of the intermediate sleeve 62, the assembly can be performed while visually aligning the guide 66 with the position of the insertion groove (not shown) on the internal electrode 11 side.

[0049] The insulating unit 10 and the cable terminal portion 50 are moved relative to each other in the axial direction so that the protrusion of the bolt 64's head is positioned to correspond to the fitting groove 111 via the insertion groove of the internal electrode 11. Then, by rotating the insulating unit 10 by approximately 90 degrees, the head of the bolt 64 can be fitted into the fitting groove 111 of the internal electrode 11. The multifaceted contact 63 is interposed between the internal electrode 11 and the intermediate sleeve 62, and is positioned so that the internal electrode 11 of the insulating unit 10 and the multifaceted contact 63 of the cable terminal portion 50 are electrically and mechanically connected. In addition, because the head of the bolt 64 is fitted into the fitting groove 111 of the internal electrode 11, axial movement of the cable terminal portion 50 can be prevented.

[0050] Then, the stress cone 53 is moved towards the insulating unit 10, and subsequently the compression device 54 is moved towards the stress cone 53, while compressing the coil spring 542 to press the tip of the stress cone 53 against the inner surface of the reinforcing insulator 12, thereby fixing the compression device 54 in the predetermined position.

[0051] Furthermore, the cable protection fitting 55 is bolted to the insulation unit 10, and a corrosion-resistant layer 56 for waterproofing is formed on the rear end of the cable protection fitting 55. In this way, the intermediate cable connection part 1 can be assembled with relatively simple work.

[0052] When current is supplied to the cable intermediate connection section 1, heat is generated at the contact point between the cable conductor 511 and the conductor connection tube 61. This heat is transmitted to the internal electrodes 11 of the insulating unit 10 via the intermediate sleeve 62 and the multifaceted contactor 63, which are mechanically connected to the conductor connection tube 61. Compared to conventional cable intermediate connection sections using a conductor ring, the cross-sectional area of ​​the heat transfer path is larger and the thermal resistance is smaller, so the heat generated at the contact point between the cable conductor 511 and the conductor connection tube 61 is efficiently dissipated.

[0053] As described above, the cable intermediate connection section 1 according to this embodiment is equipped with the following features individually or in appropriate combinations.

[0054] In other words, the cable intermediate connection section 1 is a prefabricated cable intermediate connection section comprising an insulating unit 10 having internal electrodes 11, and a cable terminal section 50 housed in the insulating unit 10, where the cable conductors 511, 511 of two power cables 51A and 51B are connected to each other by a conductor connection section 52. The conductor connection section 52 comprises a conductor connection tube 61 into which the cable conductor 511 is compressed and connected, an intermediate sleeve 62 extending to cover the compressed portion 611 of the conductor connection tube 61 and electrically and mechanically connected to the uncompressed portion 612 of the conductor connection tube 61, and a multifaceted contactor 63 arranged on the outer circumferential surface of the intermediate sleeve 62. The cable conductor 511 and the internal electrodes 11 are mechanically connected via the conductor connection tube 61, the intermediate sleeve 62, and the multifaceted contactor 63.

[0055] The cable intermediate connection section 1 enhances heat dissipation from the conductor connection section 52 to the insulation unit 10, allowing for efficient release of heat generated at the contact point between the cable conductor 511 and the conductor connection tube 61. Therefore, even if the compression section 611 of the conductor connection tube 61 is shortened, increasing the amount of heat generated, thermal deformation of the cable insulator 512 can be suppressed, ensuring the required insulation performance. Thus, the cable intermediate connection section 1 can be miniaturized.

[0056] In the cable intermediate connection section 1, the multifaceted contact 63 has a ring shape that fits onto the outer surface of the intermediate sleeve 62. This maximizes the contact area between the multifaceted contact 63 and the internal electrode 11, further improving heat dissipation to the insulating unit 10.

[0057] In the cable intermediate connection section 1, the multifaceted contacts 63 are arranged at multiple locations in the axial direction on the outer surface of the intermediate sleeve 62. This makes it easy to increase the contact area between the multifaceted contacts 63 and the internal electrodes 11, further improving heat dissipation to the insulating unit.

[0058] In the cable intermediate connection section 1, the multifaceted contactor 63 is a multi-lam band. This allows the cable intermediate connection section 1 to be easily realized using commercially available multi-lam bands.

[0059] In the cable intermediate connection section 1, the intermediate sleeve 62 is composed of multiple members divided in the circumferential direction. This allows for easy installation after the conductor connection tube 61 has been compressed and connected to the cable conductors 511, 511.

[0060] In the cable intermediate connection section 1, a thermal conductive layer 65 made of a thermally conductive material is interposed between the intermediate sleeve 62 and the uncompressed portion 612 of the conductor connection tube 61. This allows the thermal conductive layer 65 to fill any gaps that may form at the interface of the connection portion between the conductor connection tube 61 and the intermediate sleeve 62, thereby further improving heat dissipation.

[0061] Although the present invention has been specifically described above based on embodiments, the present invention is not limited to the above embodiments and can be modified without departing from its spirit.

[0062] In this embodiment, the guide 66 of the intermediate sleeve 62 is provided in the shape of a groove, but the guide 66 does not have to be groove-shaped as long as it serves as a guide during assembly. For example, it may be formed by something like a marking.

[0063] Furthermore, in this embodiment, the projection of the intermediate sleeve 62 for fitting the intermediate sleeve 62 with the internal electrode 11 is formed by the head of the bolt 64, but the shape of the projection is not limited.

[0064] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0065] 1. Cable intermediate connection section 10 Insulation Units 11 Internal electrode 12 Reinforcement insulator 13 Shielding section 14 Protection tube 50 Cable terminal 51A, 51B power cables 511 Cable conductor 52 Conductor connection 61 Conductor connecting tube 62 Intermediate Sleeves 63 Multifaceted contactor 65 Thermal conductive layer

Claims

1. An insulating unit having internal electrodes, The cable conductors of the two power cables are connected to each other by a conductor connector, and the cable terminal portion is housed in the insulating unit, A prefabricated cable intermediate connection section comprising: The aforementioned conductor connection part is The cable conductor is compressed and connected to a conductor connecting tube, An intermediate sleeve extends to cover the compressed portion of the conductor connecting pipe and is electrically and mechanically connected to the non-compressed portion of the conductor connecting pipe, The intermediate sleeve has a multifaceted contactor arranged on its outer circumferential surface, The cable conductor and the internal electrode are mechanically connected via the conductor connecting tube, the intermediate sleeve, and the multifaceted contact. Cable intermediate connection point.

2. The multifaceted contactor has a ring shape that fits onto the outer circumferential surface of the intermediate sleeve. The cable intermediate connection part according to claim 1.

3. The multifaceted contactor is arranged at multiple locations in the axial direction on the outer surface of the intermediate sleeve. The cable intermediate connection part according to claim 2.

4. The aforementioned multifaceted contactor is a multilam band. The cable intermediate connection part according to claim 1 or 2.

5. The aforementioned intermediate sleeve is composed of a plurality of members divided in the circumferential direction. The cable intermediate connection part according to claim 1 or 2.

6. A thermal conductive layer made of a thermally conductive material is interposed between the intermediate sleeve and the non-compressible portion of the conductor connecting tube. The cable intermediate connection part according to claim 1 or 2.

7. The outer circumferential surface of the intermediate sleeve is provided with a projection that engages with a fitting groove provided on the inner circumferential surface of the internal electrode. The cable intermediate connection part according to claim 1.

8. A guide is provided on the end face of the intermediate sleeve at a position corresponding to the projection. The cable intermediate connection part according to claim 7.

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