JP3226798B2 - Corrosion protection at cable terminations and connections - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to processing of an end portion of a connection box at a power cable connection portion or a terminal connection portion, and more particularly, to a corrosion prevention processing portion of a cable termination / connection portion having a simplified structure of a corrosion prevention processing portion. .

[0002]

2. Description of the Related Art In order to connect a large-capacity power cable having a large conductor cross-section, such as a CV cable, a system as disclosed in, for example, JP-A-8-17540 is used. Are known. In the conventional cable connecting means, a copper conductor connector is fixed to a distal end of a cable conductor, and the conductor connector attached to the distal end of the two cable conductors to be connected is formed of a copper cylindrical connector. The cable is inserted so as to be opposed to the conductor joint so that the cable is conducted. Further, in the conventional example,
Each of the two conductor connectors inserted into the cylindrical conductor joint is provided with a locking means between the two conductor connectors and the cylindrical conductor joint, and the conductor connector is inserted into the cylindrical conductor joint. In the state, a step formed inside the cylindrical conductor joint,
A means is provided for locking the step formed at the tip of the conductor connector so that the conductor connector does not come off the cylindrical conductor joint.

A connection portion for a power cable as shown in the conventional example is configured as shown in FIG. 4, for example, and a connection portion 10 for a cable includes two cables 1.
Are provided integrally with the conductors 2 and 2a, respectively, at the tips of the conductors 2 and 2a. And the conductor connector 6 ...
Is inserted into the cylindrical cylindrical conductor joint 7 to constitute a means for setting the conduction state between the conductors via the cylindrical cylindrical conductor joint. In the cable connecting portion 10, a high-voltage shield electrode 11 is arranged at a position corresponding to the cylindrical cylindrical conductor joint 7, and a reinforcing insulator 12 is integrally formed in a cone shape with a predetermined length around the high-voltage shield electrode 11. Place. The reinforcing insulator 12 is formed as a single piece using a rubber / plastic material such as an uncrosslinked polyethylene resin to which a crosslinking agent has been added.

In the cable connection section, a reinforcing insulator 1
A shielding layer 13 is provided around the periphery of 2, the waterproof mixture 14 is formed at a predetermined thickness on the outer periphery thereof, and a metal protection tube 15 is arranged on the outer periphery of the waterproof mixture 14. Further, when forming an insulated connecting portion with respect to the protective tube 15, the insulating tube 16 is arranged at a predetermined position, and a terminal seat 17 is arranged with respect to the protective tube 15 to be connected to a cross bond or the like. Means are provided. Further, a waterproof layer 18 is disposed so as to cover both ends of the insulating tube 16 and a connection portion with the cable sheath tube, and the waterproof layer 18 is formed by means such as winding an insulating tape. It constitutes means for preventing moisture and the like from entering inside.

In the cable connection box 10 as shown in FIG. 4, a member as shown in FIG. 5 is disposed between the end of the protective tube 15 and the end of the cable.
Means are provided to prevent the cable sheath from moving in the cable length direction due to the stress remaining in the cable sheath at the time of manufacturing the cable, and to set a good connection relationship between the cable connection box and the cable. As a connection structure at the end of the cable connection box shown in FIG. 5, a tape or the like is wound around the cable sheath 5 and a tape winding portion 20 is arranged, and the inner surface of the end of the protective tube 15 and the cable sheath 5 are connected. There is no gap between them. Further, a ring-shaped conductor 22 is fixed to the cable metal shielding layer 4 at a position at a predetermined distance from the end of the cable sheath 5 of the cable 1, and the end is fixed to the ring-shaped conductor 22. The ground wire 23 is connected to the protection tube 1
5 is fixedly attached to the tip.

[0006] A sheath piece 21 is welded to the cable sheath 5 at a position separated from the protective tube 15 by a predetermined distance, and a sheath retaining member 24 is arranged using the sheath piece 21. The retaining member 24 includes a metal ring 25 disposed outside the sheath piece 21 (outside the protective tube in the cable length direction) and the protective tube 1.
5 are fixed at both ends. The sheath retaining member 24 uses a flat knitted wire,
Even if the cable sheath moves in the direction of being detached from the cable connection box due to stress during manufacturing, the reliability of the cable connection box can be maintained as long as the sheath retaining member 24 does not come off. Further, for each component disposed at the end of the cable connection box,
An insulating layer 30 formed by winding an insulating tape is provided.
A distal end protection tube 31 is provided on the outer peripheral portion, and further, an outer peripheral portion of the distal end protective tube 31 and an outer peripheral portion of the protective tube 15 are provided.
The anticorrosion layers 19 and 32 are arranged, respectively, and the anticorrosion layer is configured using a shrink tube or the like.

[0007]

However, when the structure of the end portion of the cable connection box as shown in FIG. 5 is used, since the sheath retaining member 24 is formed of a flat knitted wire, the cable sheath is not provided. It is easy to arrange along
The work of soldering the end of the sheath retaining member is troublesome, and a protrusion or the like is formed on the fixing portion of each member. And
Including the portion of the sheath retaining member and the ground wire 23,
Since many complicated irregularities and the like occur around the cable, when winding an insulating tape or the like to form an insulating layer, it is very difficult to form the insulating layer without gaps along the surface of the cable sheath. There is a problem that it becomes troublesome. In addition, since the sheath retaining member is disposed outside the protective tube, the length of the entire processing section of the cable connection box becomes longer, and there is a problem that the cable connection box becomes larger.

[0008] In addition to the above-mentioned problems, the place where the power cable connection portion is installed is often a place where the working environment is not good, such as a narrow manhole, and when the total length of the cable connection box is long, It is necessary to work for a long time in a narrow place, and there is a problem that an inconvenient work is forced on a worker. Furthermore, there are many problems that need to be solved, such as a large number of steps for processing the end portion of the cable junction box, a large amount of materials used, and the like, which greatly affects the production cost of the cable junction box. I have.

The present invention solves the above-mentioned problem of the structure of the conventional cable junction box, and simplifies the processing structure of the end of the cable junction box, improves the reliability of each connection part, It is an object of the present invention to provide an anticorrosion treatment section for a cable terminal / connection section that can easily perform a cable junction box forming operation.

[0010]

According to the present invention, a cable conductor is connected at a central portion of a reinforcing insulator, and an insulating layer is covered around the reinforcing insulator and a predetermined area of the cable surface.
The present invention relates to a cable connection box formed by constructing a protective tube and an anticorrosion layer on a surface portion of the insulating layer. In the present invention, a tape winding portion and a sheath piece which are fixedly attached to a cable sheath at predetermined positions at positions corresponding to the cable insertion side end of the protective tube, and a conductor connection of the sheath piece A ring-shaped conductor for attaching an end of a ground wire to a cable metal shielding layer at a side portion, a grounding metal disposed between the tape winding portion and the protection tube, and connecting the grounding metal to the ring-shaped conductor. And a grounding wire, the grounding fitting and the protective tube are fixed by soldering means, and the surface is covered with a protective tube and an anticorrosion layer. Further, in the present invention, the grounding metal fitting disposed between the tape winding portion and the protection tube is formed of a conductor having a lengthwise slit formed in a cylindrical member, and the grounding metal fitting on the conductor connecting portion side of the grounding metal fitting is provided. Provide a small diameter ring-shaped end member at the end,
The ring-shaped end member is positioned between the tape winding part and the sheath piece and fixed integrally with the cable / cable sheath, and the grounding fitting is fixed to the end of the protective tube.

As described above, in the processing section of the grounding / holding member corresponding to the cable connection box of the present invention, the connection of the ground wire and the arrangement of the sheath holding member are performed at a portion entering the inside of the protective tube. In addition, since the tape winding part, the sheath piece, and the fixed part of the ring-shaped conductor are arranged without protruding outside the protection tube, when forming the cable junction box, the end of the protection tube is connected to the end of the protection tube. The operation of forming the insulating layer on the cable can be easily performed.
In addition, a grounding fitting is used as a member for fixing the cable sheath to the protection tube, and the cable sheath and the protection tube are integrated via the grounding fitting, so that movement corresponding to contraction of the cable sheath occurs. It is possible to set the action to oppose the movement of the cable sheath using the ground wire and the conduction, while performing the action of blocking.
The configuration of the grounding / retaining member can be simplified. And, since all the members constituting the grounding and retaining member are housed inside the protection tube, the processing part of the insulation layer at the end of the protection tube can be simplified, and even if the length of the insulation layer is shortened. Thus, the performance of the cable junction box can be maintained satisfactorily.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The anticorrosion processing section of the cable termination / connection section according to the present invention will be described with reference to the illustrated example. The example shown in FIG. 1 is a cable connection box 10 shown in FIG.
A tape winding portion 20 formed by winding a tape or the like around the cable sheath 5 is arranged to improve the connection structure at the end portion of the protective tube 15 and the inner surface of the end portion of the protective tube 15 and the cable sheath. 5 so that no gap is formed between them. Further, a ring-shaped conductor 22 is fixed to the cable metal shielding layer 4 on the conductor connection portion side at a predetermined distance from the end of the cable sheath 5 of the cable 1, and the ring-shaped conductor 22 is The ground wire 23 with the fixed part
Extends to the inside of the tip 15a of the protection tube 15, and
The end of the grounding member 36 of the retaining member 35 is fixed. In the grounding / retaining member 35, the sheath piece 21 is disposed in a portion inside the tape winding portion 20, and between the tape winding portion 20 and the inner surface of the protective tube 15,
A cylindrical grounding bracket 36 as shown in FIGS.
The end 15a of the protective tube 15 and the grounding metal 36 are fixed using a soldered portion 36a.

The grounding bracket 36 is, as shown in FIG.
It can be formed as a member having a substantially C-shaped cross section by providing a lengthwise slit in a part of a cylindrical member, and is made of a soft copper alloy having a thickness of about 1 mm.
Then, the main body portion 37 configured as the substantially cylindrical member
A ring-shaped end member 38 having a substantially U-shaped cross-section is integrally provided at one end (the end on the conductor connection portion side), and the diameter of the inner surface of the ring-shaped end member 38 is adjusted by a cable sheath. 5 slightly larger than the tape winding portion 20 and the sheath piece 2
It is formed in a size that can fit between the two. Further, the end of the ground wire 23 is attached to the groove of the ring-shaped end member 38 via a fixing portion 39 such as welding, and a ring-shaped conductive member provided on the cable metal shielding layer 4 via the ground wire 23. Body 2
2 is connected to the grounding fitting 36, and furthermore, the grounding fitting 36 and the protective tube 15 are brought into direct contact with each other by direct contact.

In each of the components constituting the grounding / holding member 35, the tape winding portion 20 is formed by winding an insulating tape member around the surface of the cable sheath 5 with a predetermined thickness. The cable sheath 20 and the cable sheath 5 are integrally formed. The ring-shaped conductor 22 is made of a conductive material such as a copper alloy. The ring-shaped conductor 22 is fixed and attached before the cable conductor is connected via the reinforcing insulator. The sheath piece 21 is formed in a ring shape using the same material as the cable sheath 5, and the sheath piece 21 and the cable sheath 5 are provided as an integral body by means such as welding. Therefore, the two members of the tape winding portion 20 and the sheath piece 21 are configured as being integrated with the cable cable sheath 5, and the force by which the cable sheath 5 tries to move in the length direction of the cable conductor is reduced. Even if it acts, the cable sheath, the tape winding portion, the sheath piece and the like can be moved integrally.

Further, as the ground wire 23, a flat knit wire can be used. When the flat knit wire is used, the ground wire 23 can be easily wired. Even if a tension is applied to the ground wire by the movement of the cable sheath, the ground wire can easily follow and expand and contract. Then, when forming the waterproofing mixture 14 as an insulating layer (hereinafter, referred to as the insulating layer 14) so as to include the ground wire inside the tape winding, the tape winding operation can be easily performed. .

When processing the ends of the cable connection box as shown in FIG. 1 by using the members having the above-described configuration, first, the same as the cable connection box 10 shown in FIG. Then, an operation of connecting the cable conductors 2 and 2a via the high-voltage shield electrode 11 disposed inside the reinforcing insulator 12 is performed. At the time of connection of the conductor, a portion corresponding to the cable connection box of the cable is provided with a tape winding portion 2.
0, a sheath piece 21, a ring-shaped conductor 22, and a process of attaching a ground wire 23 for attaching one end to the ring-shaped conductor 22 in advance to prepare for forming the grounding / retaining member 35. deep. As described above, after the fixing members corresponding to the cable connection boxes of the cables are attached, the grounding / retaining member 36 shown in FIG. The ring-shaped end member 38 is inserted and fixed between the tape winding part 20 and the sheath piece 21 as shown in FIG.
9 and connected to the ring-shaped end member 38. The ground wire 23 is, for example, a structure in which four wires are attached at a predetermined interval.
It can be mounted at intervals of 0 °.

After performing the above-described processing on the cable end and connection of the conductor, an operation of forming an insulating layer 14 of a waterproof mixture around the reinforcing insulator and the cable is performed. Then, a process for holding the grounding wire 23 integrally is performed to form the grounding / retaining member 35. Next, the protection tube 15 is moved in accordance with the arrangement position of the cable connection box, and the end 15a of the protection tube 15 is fixed to the tip of the grounding bracket 37 via the welded portion 36a. The protection tube 15 and the cable metal shielding layer 4 are electrically connected via the metal fitting 36. Thereafter, an insulating tape is wrapped around the end of the protective tube 15 and the end of the cable to form an insulating layer 30.
The protective tube 31 is disposed so as to cover the surface portion of the cable connecting box, and the anticorrosion layers 19 and 32 are provided so as to cover the surfaces of the protective tube 31 and the protective tube 15. The anticorrosion treatment on the surface is ended.

Although the embodiment of the present invention has been described for the case where the end of the anticorrosion layer in the cable junction box is processed,
The structure of the grounding / retaining member of the present invention can also be applied to the connection processing of the terminal part other than the cable connection box. It is possible to apply the grounding / retaining member of the invention. Then, also for the cable end portion, each of the components arranged at the cable end portion is fixed corresponding to the end portion of the protective tube, and conduction is set using a ground wire, and It is possible to arrange the fixing means for preventing the movement, and to configure the insulating layer and the anticorrosion layer.

[0019]

As described above, in the processing section of the grounding / holding member corresponding to the cable junction box of the present invention, the connection of the grounding wire and the arrangement of the sheath holding member at the portion entering the inside of the protective tube are performed. In addition, since the tape winding portion, the sheath piece, and the fixed portion of the ring-shaped conductor are arranged without protruding outside the protection tube, the end of the protection tube can be formed when forming the cable junction box. The work of forming the insulating layer on the part and the cable can be easily performed.
In addition, a grounding fitting is used as a member for fixing the cable sheath to the protection tube, and the cable sheath and the protection tube are integrated via the grounding fitting, so that movement corresponding to contraction of the cable sheath occurs. It is possible to set the action to oppose the movement of the cable sheath using the ground wire and the conduction, while performing the action of blocking.
The configuration of the grounding / retaining member can be simplified. Since all the members constituting the grounding / holding member are housed inside the protection tube, no protrusion is generated in the processing portion of the insulating layer at the end of the protection tube, and the tape winding operation can be performed. Since it can be easily performed and the tape winding amount is reduced, it is possible to improve the efficiency of preparing the cable connection box.

Further, in the present invention, the insulating layer provided at the end of the cable connection box can be shortened, so that the cable connection box can be downsized and the cable connection box can be formed short, so that it is narrow. In the manhole,
A cable junction box can be configured. Further, since the grounding fitting used for the grounding / retaining member of the present invention is a thin metal member, the work of soldering the grounding wire can be easily performed. However, the connection work can be easily and reliably performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of an end portion of a connection portion of the present invention.

FIG. 2 is an enlarged explanatory view of a main part of FIG. 1;

FIG. 3 is an explanatory diagram showing a configuration of a grounding fitting used in the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a general cable connection box.

FIG. 5 is an explanatory diagram showing a configuration of a conventional connection portion end portion.

[Explanation of symbols]

1 cable, 2 conductors, 4 cable metal shielding layer, 5 cable sheath, 6 reinforced insulator,
10 Cable connection box, 15 Protection tube, 19
Anticorrosion layer, 20 tape winding part, 21 sheath piece, 22 ring-shaped conductor, 23 ground wire, 2
4 Sheath retaining member, 25 metal ring, 3
0 Insulating layer, 31 Tip protection tube, 32 Corrosion protection layer, 35 Grounding / retaining member, 36 Grounding bracket, 38 Ring-shaped end member.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 15/06 H02G 15/10 H02G 1/14

Claims (2)

(57) [Claims] 1. A cable conductor is connected at a central portion of a reinforcing insulator, an insulating layer is coated over a predetermined area of the periphery of the reinforcing insulator and a cable surface, and a protective tube is provided on a surface portion of the insulating layer. In a cable junction box constructed by constructing an anticorrosion layer, at a position corresponding to a cable insertion side end of the protective tube,
A tape winding part and a sheath piece which are fixedly attached to the cable sheath at predetermined intervals, respectively, and a ring-shaped conductor for attaching an end of a ground wire to the cable metal shielding layer at a portion of the sheath piece on the conductor connection side. A grounding metal arranged between the tape winding portion and the protection tube; a grounding wire connecting the grounding metal to the ring-shaped conductor;
Is provided, and the grounding fitting and the protection tube are fixed by soldering means,
An anticorrosion treatment part for a cable terminal / connection part, wherein the surface part is covered with a protective tube and an anticorrosion layer. 2. A grounding metal fitting disposed between the tape winding part and the protection tube is made of a conductor having a lengthwise slit formed in a cylindrical member, and an end of the grounding metal fitting on a conductor connection part side. A small-diameter ring-shaped end member is provided in the portion, and the ring-shaped end member is positioned between the tape winding portion and the sheath piece and fixed integrally with the cable / cable sheath. The anticorrosion processing part of the cable termination / connection part according to claim 1, wherein the anticorrosion processing part is fixed to the cable.