JP2018029436A - Intermediate connecting portion of power cable and power cable line - Google Patents

Abstract

An intermediate connection portion of a power cable capable of achieving both mechanical protection of a rubber block insulator and ensuring of electrical stability is provided. An intermediate connection portion of a power cable for connecting ends of a power cable stepped so that each of a cable conductor, a cable insulator, and a cable shielding layer is exposed, the cable conductors being connected to each other A conductor connecting portion for connecting the cable connecting layer, a rubber block insulator disposed around the conductor connecting portion, a shield connecting layer disposed on an outer periphery of the rubber block insulator for connecting the cable shielding layers, and the shielding. A protective member disposed outside the connection layer and covering at least a part of the entire circumference of the rubber block insulator, wherein the protective member is an intermediate connection portion of a power cable that is a molded body of a material containing resin. [Selection] Figure 1

Description

  The present invention relates to an intermediate connection portion of a power cable and a power cable line.

  As the power cable, for example, a CV cable (cross-linked polyethylene insulated vinyl sheath cable) is used. Usually, when laying a power transmission line using a power cable, the ends of a plurality of power cables are connected to each other by an intermediate connection part to construct a power cable line (see, for example, Patent Document 1).

  Conventionally, a connection part (RBJ: rubber block joint) using a rubber block insulator has been used as an intermediate connection part of a power cable. The intermediate connection portion includes a conductor connection tube that connects the cable conductors, a rubber block insulator positioned around the conductor connection tube, and a braided tape that covers the rubber block insulator, and is covered with a metal case. It has been known. Recently, in order to further simplify the intermediate connection portion, a configuration in which the metal pipe is omitted and the entire connection portion is covered with a water shielding layer (heat-shrinkable tube) has been proposed.

JP 2007-110831 A

  In the intermediate connection portion of the power cable, mechanical protection of the rubber block insulator and improvement in electrical stability are desired.

  In the conventional intermediate connection part, the rubber block insulator and the shield connection layer can be mechanically protected from falling objects by providing a metal tube. Moreover, even if a person gets on the intermediate connection part, the deformation (bending) of the rubber block insulator due to a load can be suppressed, and the deterioration of the insulation performance can be suppressed. However, in the configuration accommodated in the metal tube, in some cases, the metal tube becomes a floating electrode, and there is a possibility that a voltage is induced and an electric shock is caused. In addition, since the metal pipe is heavy, the work load is large, such as assembling the intermediate connection portion.

  On the other hand, in the configuration in which the metal tube is omitted and the shrinkable tube is covered, the rubber block insulator and the shield connection layer cannot be sufficiently protected mechanically, and the deformation (deflection) of the rubber block insulator due to load is sufficiently prevented. Since it may not be possible, the insulation performance may be degraded. Therefore, it is conceivable to provide a protective cover above the intermediate connection portion. In this case, however, it is necessary to separately attach the protective cover to a place where the intermediate connection portion is installed, so that the work efficiency is lowered.

  Accordingly, an object of the present invention is to provide an intermediate connection portion of a power cable that can achieve both mechanical protection of the rubber block insulator and securing of electrical stability. Another object is to provide a power cable line having an intermediate connection portion of the power cable.

In the intermediate connection portion of the power cable according to the present disclosure, the cable conductor, the cable insulator formed on the outer periphery of the cable conductor, and the cable shielding layer formed on the outer periphery of the cable insulator are exposed. An intermediate connection portion of the power cable connecting the ends of the stripped power cable,
A conductor connecting portion for connecting the cable conductors;
A rubber block insulator disposed around the conductor connecting portion;
A shielding connection layer that is disposed on the outer periphery of the rubber block insulator and connects the cable shielding layers;
A protective member that is disposed outside the shielding connection layer and covers at least a part of the entire circumference of the rubber block insulator;
The said protection member is a molded object of the material containing resin.

  A power cable line according to the present disclosure includes an intermediate connection portion of the power cable according to the present disclosure.

  The intermediate connection portion of the power cable can achieve both mechanical protection of the rubber block insulator and electrical stability. The above power cable line can achieve both mechanical protection of the rubber block insulator and electrical stability at the intermediate connection part that connects the ends of the power cable.

FIG. 3 is a schematic partial longitudinal sectional view showing an intermediate connection portion of the power cable according to the first embodiment. It is the schematic cross-sectional view cut | disconnected by the II-II line | wire of FIG. It is a schematic side view which shows the installation state of the intermediate connection part of the power cable which concerns on Embodiment 1. FIG. It is a schematic front view which shows the installation state of the intermediate connection part of the power cable which concerns on Embodiment 1. FIG. 6 is a schematic cross-sectional view showing an intermediate connection portion of a power cable according to Embodiment 2. FIG.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.

(1) The intermediate connection part of the power cable according to one aspect of the present invention includes a cable conductor, a cable insulator formed on the outer periphery of the cable conductor, and a cable shielding layer formed on the outer periphery of the cable insulator. An intermediate connection portion of the power cable connecting the ends of the power cable stripped so as to be exposed,
A conductor connecting portion for connecting the cable conductors;
A rubber block insulator disposed around the conductor connecting portion;
A shielding connection layer that is disposed on the outer periphery of the rubber block insulator and connects the cable shielding layers;
A protective member that is disposed outside the shielding connection layer and covers at least a part of the entire circumference of the rubber block insulator;
The said protection member is a molded object of the material containing resin.

  According to the intermediate connection portion of the power cable, the rubber block insulator and the shield connection layer can be mechanically protected by including a protective member formed of a molded body of a resin-containing material. Moreover, since the deformation | transformation (deflection) of the rubber block insulator by a load load can be suppressed, the fall of insulation performance can be suppressed. Since the protective member is a molded body made of a material containing a resin, it has higher electrical insulation than a conventional metal tube and does not function as a floating electrode, so that electrical stability is improved. Therefore, the intermediate connection portion of the power cable can achieve both mechanical protection of the rubber block insulator and electrical stability.

  Since the intermediate connection part of the power cable is formed of a molded body made of a material containing a resin as a protective member, it is possible to achieve a reduction in weight and cost as compared with a conventional metal tube. Since the intermediate connection portion of the power cable can be reduced in weight, the assembly workability is improved. Furthermore, since a protective member is provided in the intermediate connection part itself, it is not necessary to attach a protective cover separately.

  The protection member can be composed of a single tubular body, or can be composed of a plurality of divided pieces divided in the circumferential direction. The protection member is preferably provided so as to cover at least the upper and lower sides of the entire circumference of the rubber block insulator from the viewpoint of preventing deformation (particularly bending) of the rubber block insulator due to a load.

  (2) As an aspect of the intermediate connection portion of the power cable, an insulating tape layer formed by winding an insulating tape around the outer periphery of the shielding connection layer and disposed between the shielding connection layer and the protective member. Preparation.

  By providing the insulating tape layer, the electrical insulation can be improved and the electrical stability can be improved. Further, the insulating tape layer functions as a cushion, and the protective member is easily disposed in close contact. By improving the adhesion of the protective member, it is difficult to form an air layer between the shield connection layer and the protective member, and the insulation resistance can be improved. Furthermore, since it is difficult to form an air layer, it is easy to transfer heat to the protective member when the temperature of the power cable rises, and heat dissipation can be improved.

  (3) As one form of the intermediate connection part of the power cable, it is possible to provide a covering material that covers the entire circumference of the protective member.

  When the protective member is composed of a plurality of divided pieces divided in the circumferential direction, the divided pieces can be fixed by the covering material, and the protective member can be prevented from falling off. In addition, by providing a covering material, it is possible to increase electrical insulation and prevent moisture from entering the interior.

  (4) As one form of the intermediate connection part of the said power cable, it is mentioned that the said protection member has a some division | segmentation piece divided | segmented into the circumferential direction.

  Since the protective member has a plurality of divided pieces divided in the circumferential direction, the protective member is easily placed in close contact. Therefore, it is difficult to form an air layer between the shield connection layer and the protective member, and heat can be efficiently transmitted to the protective member when the temperature of the power cable rises, and heat dissipation can be improved. Furthermore, since the protective member has a plurality of divided pieces divided in the circumferential direction, the protective member can follow the deformation even if the power cable expands.

  (5) As one form of the intermediate | middle connection part of the electric power cable as described in said (4), it is mentioned that the clearance gap is formed between the said division | segmentation pieces adjacent to the circumferential direction.

  Since the gap is formed between the adjacent divided pieces, the protective member can follow the deformation even when the power cable contracts.

  (6) As one form of the intermediate | middle connection part of the power cable as described in said (4) or (5), it is mentioned that the said division | segmentation piece is two.

  When the protective member is composed of a plurality of divided pieces that are divided in the circumferential direction, the protective member can be attached from the outside, so that the arrangement work of the protective member is facilitated. Since the number of divided pieces is two, the number of parts can be reduced, and the assembly workability of the intermediate connection portion can be improved. When the protective member is constituted by two divided pieces, the divided pieces may be arranged on the upper side and the lower side of the rubber block insulator from the viewpoint of preventing deformation (particularly bending) of the rubber block insulator due to load. preferable.

  (7) As one form of the intermediate connection part of the said power cable, it is mentioned that the said protection member is formed with the vinyl chloride resin.

  Vinyl chloride resin is suitable as a material for forming a protective member because it is inexpensive and easy to mold, has excellent mechanical strength and electrical insulation, and is flame retardant.

  (8) As one form of the intermediate connection part of the said power cable, it is mentioned that the thickness of the said protection member is 1 mm or more and 20 mm or less.

  When the thickness of the protective member is 1 mm or more, it is easy to ensure the mechanical strength and electrical insulation of the protective member. When the thickness of the protective member is 20 mm or less, it is possible to avoid an increase in the diameter of the protective member and to reduce the size and weight of the intermediate connection portion.

  (9) As one form of the intermediate connection part of the power cable, the protective member is tubular.

  Since the protective member is tubular, it is easy to mechanically protect the rubber block insulator over the entire circumference. “Tubular” does not have to be a tube in the strict sense, and is not limited to a complete tube with no cuts (seam) or gaps in the circumferential direction, including those with cuts or gaps in the circumferential direction, Includes areas that are substantially regarded as tubes. Here, when the protective member covers 90% or more of the entire circumference of the rubber block insulator, the protective member is considered to be tubular.

  (10) A power cable line according to an aspect of the present invention includes an intermediate connection portion of the power cable according to an aspect of the present invention.

  By providing the intermediate connection portion, the power cable line can achieve both mechanical protection of the rubber block insulator and electrical stability in the intermediate connection portion that connects the ends of the power cables.

[Details of the embodiment of the present invention]
Specific examples of the intermediate connection portion of the power cable and the power cable line according to the embodiment of the present invention will be described below with reference to the drawings. The same code | symbol in a figure shows the same name thing. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

[Embodiment 1]
<Intermediate connection part>
With reference to FIGS. 1-4, the intermediate connection part 1 of the power cable which concerns on Embodiment 1 is demonstrated. As illustrated in FIG. 1, the intermediate connection unit 1 connects the ends of the power cable 100 to construct a power cable line 200. As shown in FIGS. 1 and 2, the intermediate connection portion 1 includes a conductor connection portion 10, a rubber block insulator 20, a shielding connection layer 30, and a protection member 50. One of the features of the intermediate connecting portion 1 is that the protective member 50 is formed of a molded body made of a material containing resin. Hereinafter, the configuration of the intermediate connection unit 1 will be described in detail.

<Power cable>
First, the configuration of the power cable 100 shown in FIG. 1 will be described. The power cable 100 includes a cable conductor 110, a cable insulator 120 formed on the outer periphery of the cable conductor 110, and a cable shielding layer 130 formed on the outer periphery of the cable insulator 120, and is covered with the cable sheath 140. It is a configuration. In this example, the power cable 100 is a CV cable. A cable inner semiconductive layer (not shown) is provided on the inner peripheral portion of the cable insulator 120, and a cable outer semiconductive layer 123 is provided on the outer peripheral portion. As shown in FIG. 1, the ends of the power cable 100 to be connected are stepped so that the cable conductor 110, the cable insulator 120, the cable outer semiconductive layer 123, and the cable shielding layer 130 are exposed. .

  The cable insulator 120 is formed of a resin having electrical insulation, and the cable inner semiconductive layer and the cable outer semiconductive layer 123 are formed of a semiconductive resin. The cable shielding layer 130 is formed of a conductive metal tape such as copper or aluminum or a braided wire.

<Power cable line>
A power cable line 200 shown in FIG. 1 includes an intermediate connection portion 1 and is constructed by connecting ends of the power cable 100 with the intermediate connection portion 1.

(Conductor connection)
As shown in FIG. 1, the conductor connection portion 10 is a member that connects the cable conductors 110 and is formed of a conductive metal such as copper or aluminum. In this example, the conductor connection portion 10 is a metal cylindrical body having both ends opened, and the cable conductors 110 are electrically connected to each other by inserting and compressing the cable conductors 110 from the openings at both ends. .

(Rubber block insulator)
As shown in FIG. 1, the rubber block insulator 20 is a cylindrical member disposed around the conductor connection portion 10, and is used for main insulation of the intermediate connection portion 1. The rubber block insulator 20 has a main insulating layer 21, and an inner semiconductive layer 22 is provided on the inner peripheral portion of the axial intermediate portion of the rubber block insulator 20, and an outer semiconductive layer 23 is provided on the outer peripheral portion. A main insulating layer 21 is provided between the semiconductive layers 22 and 23. When the rubber block insulator 20 is disposed around the conductor connecting portion 10, the internal semiconductive layer 22 is located on the conductor connecting portion 10, and the external semiconductive layer 23 is connected to the cable external semiconductive layer 123, The main insulating layer 21 is configured to adhere to the cable insulator 120 with a predetermined surface pressure.

  The main insulating layer 21 is made of an insulating rubber, and the inner semiconductive layer 22 and the outer semiconductive layer 23 are made of a semiconductive rubber. The rubber block insulator 20 is made of, for example, ethylene propylene rubber or silicone rubber, and the main insulating layer 21, the internal semiconductive layer 22, and the external semiconductive layer 23 are integrally formed.

(Shielding connection layer)
As shown in FIG. 1, the shielding connection layer 30 is a member that is disposed on the outer periphery of the rubber block insulator 20 and connects the cable shielding layers 130, and is formed of a conductive metal such as copper or aluminum. Yes. In this example, the shield connection layer 30 is formed by covering the rubber block insulator 20 with a metal braided wire. By connecting both ends of the shield connection layer 30 to each cable shield layer 130, the shield connection layer 30 is formed. The cable shielding layers 130 are electrically connected via 30. The shield connection layer 30 and the cable shield layer 130 are connected to each other by the roll spring 35 with both ends of the shield connection layer 30 overlapped with each cable shield layer 130. The shield connection layer 30 and the cable shield layer 130 may be connected by using a method such as crimping or soldering in addition to using the roll spring 35. Here, a configuration in which the shield connection layer 30 is not grounded is illustrated, but a configuration in which the shield connection layer 30 is grounded by connecting a ground wire to at least one end of the shield connection layer 30 is also possible. .

(Protective member)
As shown in FIGS. 1 and 2, the protection member 50 is a member that is disposed outside the shielding connection layer 30 and covers at least a part of the entire circumference of the rubber block insulator 20. The connection layer 30 is mechanically protected from the outside. In this example, the protection member 50 is tubular, and as shown in FIG. 2, the protection member 50 is composed of one cylindrical tubular body having no cuts or gaps in the circumferential direction. Since the protective member 50 is a molded body made of a material containing resin, it is hard and difficult to deform, and therefore it is easy to ensure mechanical strength.

  The protective member 50 is preferably formed of a resin having excellent mechanical strength and electrical insulation and flame retardancy. Examples of the resin that satisfies such requirements include vinyl chloride resin, fluororesin, polyamide resin (nylon), and ABS resin. Among these, vinyl chloride resin is preferable because it is inexpensive and easy to mold. In this example, the protective member 50 is a PVC pipe formed of a vinyl chloride resin.

  The thickness of the protection member 50 is preferably 1 mm or more and 20 mm or less, for example. When the thickness of the protective member 50 is 1 mm or more, it is easy to ensure mechanical strength and electrical insulation. Can be achieved. In this example, the thickness of the protection member 50 is 7 mm. The thickness of the protection member 50 is 2 mm or more and 15 mm or less, for example, and is 3 mm or more and 10 mm or less.

  The protective member 50 is preferably disposed in close contact with the outer side of the shield connection layer 30 and has an inner diameter corresponding to the outer diameter of the shield connection layer 30. Since the air layer is not easily formed between the protective member 50 and the shield connection layer 30 when the protective member 50 is in close contact, it is easy to transfer heat to the protective member 50 when the temperature of the power cable 100 rises, and heat dissipation can be improved.

  As shown in FIGS. 1 and 2, the intermediate connection portion 1 further includes an insulating tape layer 40 and a covering material 60.

(Insulating tape layer)
The insulating tape layer 40 is formed by winding an insulating tape around the outer periphery of the shielding connection layer 30 and is disposed between the shielding connection layer 30 and the protective member 50. For example, ethylene propylene rubber can be used as the insulating tape. Although the thickness of the insulating tape layer 40 is not specifically limited, For example, they are 2 mm or more and 20 mm or less.

  A metal water shielding layer (not shown) may be formed by winding a metal sheet such as aluminum around the outer periphery of the insulating tape layer 40, thereby preventing moisture from entering the inside.

(Coating material)
The covering material 60 is a member that covers the entire circumference of the protection member 50 and is formed of a shrinkable tube. Examples of the material for the shrinkable tube include polyolefin resin, ethylene propylene rubber, and silicone rubber. In this example, the covering material 60 is a heat-shrinkable tube with a metal water-impervious layer and functions as a water-impervious layer in addition to reinforcing electrical insulation. As described above, when a water shielding layer is formed on the outer periphery of the insulating tape layer 40, a normal heat shrinkable tube without a metal water shielding layer may be used as the covering material 60. The covering material 60 is longer than the protective member 50 in the cable axial direction, covers both end portions of the shield connection layer 30, and is disposed so as to straddle between one cable sheath 140 from the other. Both ends of the covering material 60 are waterproofed by winding a waterproof tape 65 on each cable sheath 140.

<Assembly method of intermediate connection part>
With reference to FIG. 1, an example of the assembly method of the intermediate | middle connection part 1 mentioned above is demonstrated.

  The rubber block insulator 20 and the protection member 50 (in this example, a PVC pipe) are inserted in advance into one power cable 100. At this time, the rubber block insulator 20 is expanded in diameter and is held in an expanded state by a diameter expansion holding material (not shown). The ends of each power cable 100 are stripped to expose the cable conductor 110, the cable insulator 120, the cable outer semiconductive layer 123, and the cable shielding layer 130.

  The cable conductors 110 are inserted into the conductor connection portion 10 and compressed to connect the cable conductors 110 to each other. After the expanded diameter rubber block insulator 20 is moved to a predetermined position, the expanded diameter holding material is extracted, the rubber block insulator 20 is contracted, and is closely attached to the cable insulator 120.

  A semiconductive tape 25 is wound around the outer periphery of the cable external semiconductive layer 123 located at both ends of the rubber block insulator 20 (external semiconductive layer 23), and an annular spacer 26 is attached thereon. The external semiconductive layer 23 and the cable external semiconductive layer 123 are connected by the semiconductive tape 25. Each spacer 26 is formed of a half-cracked annular body composed of two divided pieces, and the divided pieces are combined into a truncated cone-shaped annular body.

  A shield connection layer 30 is formed by winding a braided wire around the outer periphery of the rubber block insulator 20, and both ends thereof are connected to the respective cable shield layers 130 using roll springs 35, and the cable shield is provided via the shield connection layer 30. Layers 130 are connected together. An insulating tape layer 40 is formed by winding an insulating tape around the outer periphery of the shield connection layer 30.

  The protection member 50 inserted in advance is moved to a predetermined position and arranged so as to cover the rubber block insulator 20. A heat-shrinkable tube (in this example, a heat-shrinkable tube with a metal water-impervious layer) is placed on the outer periphery of the protective member 50 so as to straddle between the cable sheaths 140 and is heat-shrinked with a dryer or the like. Covering with the covering material 60, both ends of the covering material 60 are brought into close contact with each cable sheath 140. Finally, the waterproof tape 65 is wound around both ends of the covering material 60 to perform waterproofing.

<Use of intermediate connection part>
The intermediate connection part 1 described above can be suitably used for the intermediate connection part of the power cable line 200 of the underground power transmission line. The intermediate connection portion 1 is installed on a support column when laid on the ground, and is installed in a manhole or a cave when laid underground.

<Installation of intermediate connection part>
With reference to FIG. 3 and FIG. 4, an example of the installation state of the intermediate | middle connection part 1 is demonstrated. Here, the case where the three intermediate connection parts 1 are arrange | positioned along with the assumption of a three-phase alternating current power transmission line is illustrated. The intermediate connecting portion 1 is supported by a plate-shaped connection portion receiving object 80 attached in the horizontal direction, and is placed on a connection portion receiving pillow 81 fixed to the connection portion receiving object 80. The connection portion receiving pillow 81 includes a concave portion 82 on which the intermediate connection portion 1 is placed, and an attachment portion 83 that fixes the connection portion receiving pillow 81 to the connection portion receiving object 80. The recess 82 is formed in an arc shape corresponding to the shape of the intermediate connection portion 1. The attachment portion 83 is formed in a bifurcated shape that sandwiches the connection receiving piece 80 from the front and back sides. In this example, the connection portion receiving pillow 81 has three recesses 82 so as to correspond to the three intermediate connection portions 1, respectively. Further, the three intermediate connection portions 1 placed in the recess 82 are bound and fixed to the connection portion receiving pillow 81 by the fastening band 85.

<Effect of intermediate connection>
The intermediate connection part 1 of Embodiment 1 mentioned above has the following effects.

  By providing the protection member 50, the rubber block insulator 20 and the shield connection layer 30 can be mechanically protected, and deformation (deflection) of the rubber block insulator 20 due to a load load can be suppressed. it can. Since the protective member 50 is a molded body of a material containing a resin, it is easy to ensure mechanical strength, has high electrical insulation, and does not function as a floating electrode, so that electrical stability is improved. In addition, since the protective member 50 is a molded body of a material containing a resin, it is possible to reduce the weight and the cost, and in particular, it is possible to realize the weight reduction, so that the assembly workability is improved.

  Since the protection member 50 is tubular, it is easy to mechanically protect the rubber block insulator 20 over the entire circumference. In this example, the protection member 50 is formed of a single tubular body and covers the entire circumference of the rubber block insulator 20. Therefore, even if a person gets on the intermediate connection portion 1, deformation (deflection) of the rubber block insulator 20 due to a load can be suppressed, and a decrease in insulation performance can be suppressed.

  By providing the insulating tape layer 40 between the shield connection layer 30 and the protective member 50, the electrical insulation can be reinforced. Further, the insulating tape layer 40 functions as a cushion, and the protective member 50 is easily placed in close contact with the outside of the shield connection layer 30. By improving the adhesion of the protective member 50, it is difficult to form an air layer between the shield connection layer 30 and the protective member 50, and the insulation resistance can be improved. Furthermore, since it is difficult to form an air layer, it is easy to transfer heat to the protective member 50 when the temperature of the power cable 100 rises, and heat dissipation can be improved.

[Embodiment 2]
In Embodiment 1, the form in which the protection member 50 was comprised with one tubular body was demonstrated. In the second embodiment, a configuration in which the protection member 50 is configured by a plurality of divided pieces divided in the circumferential direction will be described. Hereinafter, the intermediate connection part 2 of the power cable according to the second embodiment will be described with reference to FIG. The intermediate connection portion 2 of the second embodiment is different from the intermediate connection portion 1 of the first embodiment in the configuration of the protective member 50, and the other configurations are basically the same as those of the first embodiment. The detailed description of these items is omitted.

  The protective member 50 shown in FIG. 5 includes two divided pieces 51 and 52 divided in the circumferential direction. The divided piece 51 is on the upper side of the rubber block insulator 20 and the divided piece 52 is on the lower side of the rubber block insulator 20. Each is arranged. In this example, the division pieces 51 and 52 are formed in a substantially semicircular arc shape, and the protection member 50 is formed of a half-cracked tubular body. Since the entire circumference of the protection member 50 is covered with the covering material 60, it is possible to prevent the protection member 50 (divided pieces 51 and 52) from falling off.

  According to the intermediate connection part 2 of the second embodiment, since the protection member 50 is configured by the plurality of divided pieces 51 and 52, the protection member 50 can be easily placed in close contact. Therefore, it is difficult to form an air layer between the shield connection layer 30 and the protection member 50, and heat can be efficiently transmitted to the protection member 50 when the temperature of the power cable 100 rises, and heat dissipation can be improved. Furthermore, even if the power cable 100 expands, the protection member 50 (divided pieces 51 and 52) can follow the deformation. When the protection member 50 is composed of a plurality of divided pieces 51 and 52, the protection member 50 can be attached from the outside when the intermediate connection portion is assembled. Assembly workability is improved.

  The divided pieces 51 and 52 are disposed on the upper and lower sides of the rubber block insulator 20, and the upper and lower sides of the entire circumference of the rubber block insulator 20 are covered with the protective member 50. Therefore, even if a person gets on the intermediate connection portion 1, deformation (deflection) of the rubber block insulator 20 due to a load can be suppressed, and a decrease in insulation performance can be suppressed.

  As shown in FIG. 5, when a gap is formed between the divided pieces 51 and 52 adjacent in the circumferential direction, the divided pieces 51 and 52 can be easily placed in close contact with the outside of the shielding connection layer 30, The adhesion of 50 is further improved. Further, even when the power cable contracts, the protection member 50 (divided pieces 51 and 52) can follow the deformation. When a gap is formed between the divided pieces 51 and 52, the entire circumference of the rubber block insulator 20 is formed so that the protective member 50 is tubular (that is, covers 90% or more of the entire circumference of the rubber block insulator 20). The total length in the circumferential direction of the gap is preferably 10% or less with respect to the length.

DESCRIPTION OF SYMBOLS 1, 2 Middle connection part 10 Conductor connection part 20 Rubber block insulator 21 Main insulation layer 22 Internal semiconductive layer 23 External semiconductive layer 25 Semiconductive tape 26 Spacer 30 Shielding connection layer 35 Roll spring 40 Insulating tape layer 50 Protective member 51, 52 Dividing pieces 60 Covering material 65 Waterproof tape 80 Receptacle for connection part 81 Receptacle for connection part 82 Recessed part 83 Mounting part 85 Clamping band 100 Power cable 110 Cable conductor 120 Cable insulator 123 Cable outer semiconductive layer 130 Cable Shielding layer 140 Cable sheath 200 Power cable line

Claims (10)

Connecting the ends of the cable conductor, the cable insulator formed on the outer periphery of the cable conductor, and the power cable stripped so as to expose each of the cable shielding layers formed on the outer periphery of the cable insulator Intermediate connection part of the power cable
A conductor connecting portion for connecting the cable conductors;
A rubber block insulator disposed around the conductor connecting portion;
A shielding connection layer that is disposed on the outer periphery of the rubber block insulator and connects the cable shielding layers;
A protective member that is disposed outside the shielding connection layer and covers at least a part of the entire circumference of the rubber block insulator;
The protective member is an intermediate connection portion of a power cable that is a molded body of a material containing resin.   The intermediate connection part of the electric power cable of Claim 1 provided with the insulating tape layer formed by winding an insulating tape around the outer periphery of the said shield connection layer, and arrange | positioning between the said shield connection layer and the said protection member.   The intermediate connection part of the electric power cable of Claim 1 or Claim 2 provided with the coating | covering material which covers the perimeter of the said protection member.   The intermediate connection part of the power cable of any one of Claim 1 to 3 in which the said protection member has a some division | segmentation piece divided | segmented in the circumferential direction.   The intermediate connection part of the electric power cable of Claim 4 with which the clearance gap is formed between the said division | segmentation pieces adjacent to the circumferential direction.   The intermediate connection part of the power cable according to claim 4 or 5, wherein the number of the divided pieces is two.   The intermediate connection part of the power cable of any one of Claims 1-6 in which the said protection member is formed with the vinyl chloride resin.   The intermediate connection part of the power cable of any one of Claims 1-7 whose thickness of the said protection member is 1 mm or more and 20 mm or less.   The intermediate connection part of the power cable according to any one of claims 1 to 8, wherein the protection member is tubular.   An electric power cable line provided with the intermediate connection part of the electric power cable of any one of Claims 1-9.

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