JPS62189912A - Structure of cable branch connection body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of a cable branch connection body, and is suitable for, for example, a branch connection part of a power distribution trunk cable.

[Prior art and problems to be solved by the invention]

When connecting a branch line to a distribution main line, conventionally the main cable is first cut at the point where the branch line is to be branched, and then the protective layer, shielding layer, and external semiconducting layer are removed at each end of the cut main cable and at the branch cable. , the insulating layer, and the internal semiconducting layer are sequentially peeled off to expose the ends of each conductor, and then the above-mentioned main cable and branch cable are connected using a pre-prepared conductor connection sleeve of any shape such as T, Y, X, etc. The ends of each conductor of the main cable and the branch cable are connected, and an insulating reinforcement is formed by wrapping an insulating tape or molding an insulating material around the connection part of each conductor of the main cable and the branch cable, and It is completed by forming a waterproofing layer on the
In the conventional structure completed in this way, not only special equipment is required to attach the conductor connection sleeve, but also
There is a problem in that the structures of the insulation reinforcing body and the waterproofing layer are complicated and the formation thereof is very troublesome.

In addition, when attempting to connect a branch line to a power distribution trunk line in this way, the worker must do so near the trunk cable; It is necessary to secure work space for workers, but as the power demand of Mtfi increases, the power distribution cables in the tunnels, including manholes and handholes, are becoming extremely crowded, and it is difficult to secure the above-mentioned space. In most cases, even if it is possible to remove it, it is only to a very limited extent and is insufficient, and as a result, the subsequent connection work is becoming more and more of a chore.

The present invention has been made in view of the above points, and its purpose is to provide a structure of a cable branch connection body that enables cable branch connection even in a narrow space by greatly simplifying the connection work. It lies in folding.

[Means for solving problems]

The gist of the present invention is that the branch connection body has an arbitrary shape such as a T, Y, ten, or a trunk connection cable whose other end is connected to the connection element of the branch connection main body; a conductor connection sleeve temporarily fixed to the conductor at one end of the trunk connection cable;
The present invention is comprised of an insulating reinforcing body for trunk line connection and a protective cylinder, which are movably mounted on the periphery of one end side of the cable for trunk line connection.

〔Example〕

The present invention will now be described in detail with reference to the accompanying drawings.

Figures 1 to 3 show an example of the structure of the cable branch connection body of the present invention, with Figure 1 being an overall explanatory diagram thereof, and Figure 2 showing the stripped ends of the trunk line connection cable and branch line connection cable. FIG. 3 is a detailed explanatory diagram of the insulating reinforcing body for connecting main lines and branch lines.

Reference numeral 1 denotes a T-shaped branch connection body, which is not particularly shown, but is a protective layer and a shielding layer of the other end examples of each main line connection cable and branch line connection cable, which will be described later.

The outer semiconducting layer, the insulating layer, the inner semiconducting layer, and other covering layers are sequentially peeled off and the exposed ends of each conductor are connected to each other using a T-shaped conductor connection sleeve, and then the circumference is sequentially removed. It is constructed by wrapping an insulating tape or by molding an insulating material to cover it with an insulating reinforcing body and a waterproofing layer. Note that this is formed in advance at a factory or the like. 2 and 3 have their own protective layers 201 and 301 .2 on one end side, respectively. Shielding layers 202 and 302. Outer semiconducting layers 203 and 303
, insulating layers 204 and 304 . The inner semiconductive layer (not shown) is stripped off in stages (see FIG. 2) and the other end is connected to the T-shaped conductor connection sleeve (not shown) of the branch connection body 1. These are main line connection cables and branch line connection cables. The main line connection cable 2 and the branch line connection cable 3 may be of the same structure as the main line cable and the branch line cable, respectively, but in consideration of connection and installation workability, cables with excellent flexibility, such as rubber insulated cables, may be used. It is desirable to use Here, we will explain the case where the branch connection body 1 has a T-shape, which is Y.

In the case of the + and X-shaped configurations, the conductor connection sleeves are basically constructed in the same manner except that Y- and -1X-shaped ones are used, respectively. 4 is each conductor 2 on one end side of the main line connection cable 2 and branch line connection cable 3, respectively.
This is the conductor connection sleeve temporarily attached to 05 and 305. The conductor connection sleeve 4 may be temporarily fastened to each conductor 205 and 305 as long as it does not fall during transportation and assembly of the cable branch connection body. Conductor connection sleeve 4
It is sufficient to place a part of the joint in pressure contact with the knot.

Reference numeral 5 denotes an insulating reinforcing body for connecting main lines and branch lines, which is attached to the circumference J2 on one end side of each main line connecting cable 2 and branch line connecting cable 3 so as to be movable on the circumference. As shown in the figure, shield layers 501.
Electric field relaxation layer 502. Insulating layer 503. Semiconductive layer 504. Shielding layer 505. The protective layers 506 are laminated and integrated with each other via silicone oil, and the entire body is made of a heat-shrinkable cylindrical body. Electric field relaxation layer 5
02 is ethylene propylene rubber, crosslinked polyethylene,
It is a material made by mixing a filler such as carbon with a heath resin such as silicone rubber, and its own dielectric constant is 10~10.
802 volume resistivity is 10'3 to 1011 Ω-G.

The shielding layer 505 is constructed of a cylindrical body made of, for example, thin copper wire lace or fishnet knitting so as to be able to contract following the other layers. Each layer 501 to 50 constituting the insulation reinforcement body 5
6 are individually manufactured as cylindrical bodies, and are stacked by sequentially inserting the cylindrical bodies from the inside. Note that although the entire layers 501 to 506 are laminated and integrated in advance here, each layer 5
01 to 506 may be simply laminated, or only arbitrary layers among the layers 501 to 506, such as the electric field relaxation layer 502 and the insulating layer 503, or the insulating layer 503 and the semiconductive layer 504, may be integrated. However, the other layers may be simply laminated. Reference numeral 6 designates one end side periphery of each main line connecting cable 2 and branch line connecting cable 3 as a protective cylinder for an insulating reinforcing body 5 for connecting the main line and branch line which is movably mounted. , which is also made of a cylindrical body that can be heat-shrinkable. The protective cylinder 6 is removed from both ends of the cables 2 and 3 to prevent staining and damage to the insulation reinforcing body 5. For example, as shown in FIG. Removable lid 6
It is more desirable if the insulation reinforcing body 5 can be sealed at both ends of the cables 2 and 3 by providing the insulation reinforcement member 01. Although not particularly shown in the drawings, the cable side end of the protective cylinder 6 is hermetically treated with a fastener such as a rubber band or a spring, or an adhesive tape or the like. Inside the protective cylinder 6, there are desiccants such as silica gel to prevent moisture absorption and deterioration, oxygen adsorbents such as iron oxide, Nt, COt, SFb.

It is also possible to seal in a dry gas such as Freon gas, and in order to inject and further seal the above gas, a gas injection sealing valve may be provided at any location on the protective cylinder 6 or lid 601. can also be considered. From the viewpoint of ease of handling, it is desirable that the protective cylinder 6 be a cylindrical body that can be heat-shrinkable, but it may also be a metal tube that does not shrink by heat. Furthermore, if the inner surface of the insulation reinforcement 5, especially the inner surface of the electric field relaxation layer 502, is coated with high viscosity silicone oil (specifically, 100,000 SC or more is preferable in consideration of prevention of flowing down), etc. This will be easier later when moving around the trunk connection cable 2. Note that 602 is a fastening tool such as a rubber band or a spring.

Next, an example of branch connection of trunk cables using the above cable branch connection body will be described with reference to FIGS. 4 and 5. FIG. 4 is a schematic explanatory diagram of the branch connection, and FIG. 5 is a detailed explanatory diagram thereof.

First, referring to FIG. 4, the outline of the two-way branch connection will be explained. Refer to FIG. ), and then after processing the end of the trunk cable 2', it is butted against the trunk connection cable 2 of the cable branch connection body 100 prepared in advance (see figure (b)), and then the two are connected. (See figure (c).)

More specifically, as shown in FIG. 5, the insulation layer 201' and the shielding layer 202' of the cut trunk cable 2'.

Outer semiconducting layer 203', insulating layer 204', inner semiconducting layer N
(not shown) is sequentially stripped from the end over a predetermined length (see figure (A)), and then the insulation reinforcing body 5 and protection on two circumferences of the main line connection cable of the cable branch connection body are removed. After moving the cylindrical body 6 toward the cable branch connection body, the conductor connection sleeve 4 temporarily fixed to the conductor 205 of the main line connection cable 2 is used to connect the conductor 205 of the main line connection cable 2 to the main line. Conductor 20 of cable 2'
5' electrically and mechanically (see figure (b)).

). At this time, the protective cylinder 6 is installed after releasing the airtight processing part on the cable side, or after removing the removable lid 601 if a removable lid 601 is provided on the opposite end of the cable. Needless to say, it will be moved. After that, first move the insulating reinforcement 5 to the circumference of the connecting portion of the conductors 205 and 205' of both cables, and then place it in a predetermined heating device (
For example, a gas burner, tape heater, sheathed heater, etc. can be used, but it is most desirable to use a far-infrared heater that generates the absorption wavelength of the insulation reinforcing body 5. ) to shrink the entire part tightly to the circumference of the connection part. Here, the entire insulation reinforcing body 5 was heat-shrinked at once, but if the insulation reinforcing body 5 were simply a stack of the layers 501 to 506, or if, for example, the electric field relaxation layer 502 and the insulating layer among the layers 501 to 506 503 or insulating layer 5
In the case where only arbitrary layers such as 03 and the semiconductive layer 504 are laminated and integrated, and the other layers are simply laminated, each layer 501 to 506 is connected to the conductors 205 and 205' in order. It may be moved to the periphery of the conductor 205 and 205', and further contracted in order until it comes into close contact with the periphery of the connection portion of the conductors 205 and 205'. However, considering that the conductor connection sleeve 4 extends in the longitudinal direction due to compression connection or the like, it is preferable to keep the shield layer 501 separate so that it can be attached according to the length of the conductor connection sleeve 4. . Next, the protective cylinder 6 is moved to the circumference of the insulation reinforcing body 5, and is further heated with a predetermined heating device to shrink the protective cylinder 6 until it comes into close contact with the circumference of the insulation reinforcement body 5 (see FIG. ).

〔Effect of the invention〕

According to the cable branch connection body of the present invention constructed in this manner, the branch connection body has an arbitrary shape such as T, Y, cross, or X shape, and its own protective layer, shielding layer, and insulating layer on one end side. A trunk connection cable is formed by sequentially stripping off the coating layers, and the other end is connected to the connecting element of the branch connection body, and the cable is temporarily fixed to the conductor at one end of the trunk connection cable. Consisting of a conductor connection sleeve, and an insulating reinforcing body and protective cylinder for trunk connection that are movably attached to the circumference of one end of the cable for trunk connection, it has the following advantages: It can have a great effect.

■ Solve the problem of missing cable length when moving the cut main cable to a position where it is easy to work.

■ The connection between the main cable pull and the cable branch connection body is a straight line connection, making the work easy.

■ Since all the main parts necessary for connecting the main cable and the cable branch connection body are included in the cable branch connection body itself, there is no need to worry about missing parts when starting work.

■ The pre-processing required for connection is simple: cutting the trunk cable and processing the terminals of the cable.

■ Since it is possible to mechanize the connection, it is possible to significantly shorten the connection work time.

■ Since there is extra cable length at the branch connection, it is possible to move the cut main cable to a position where it is easy to work on it, and it is also possible to relocate it without applying undue stress to the entire branch connection.

■ Since the ends of the stripped trunk connection cables are covered with insulation reinforcing bodies by protective cylinders, they are particularly easy to store and handle on-site.

[Brief explanation of drawings]

Figures 1 to 3 show an example of the structure of the cable branch connection body of the present invention, with Figure 1 being an overall explanatory diagram thereof, and Figure 2 showing the stripped ends of the trunk line connection cable and branch line connection cable. FIG. 3 is a detailed explanatory diagram of the insulating reinforcing body for connecting main lines and branch lines. 4 and 5 are explanatory diagrams illustrating an example of branch connection of the main cable using the cable branch connection body, and FIG. 4 is a schematic explanatory diagram of the branch connection, and FIG. is a detailed explanatory diagram thereof. FIG. 6 is an explanatory diagram of another embodiment of the protective cylinder. 1; T-shaped branch connection body, 2; Main line connection cable, 3; Branch line connection cable, 201.3011 protective layer, 202.302i shielding layer, 203.303; outer semiconducting layer, 204.304; insulation layer, 205.305. Conductor, 4; Conductor connection sleeve, 5; Insulation reinforcement, 501; Shield layer, 502; Electric field relaxation layer, 503; Insulating layer, 504; Semi-conductive layer, 505; Shielding layer, 506; Protective layer, 6; Protective cylinder Body, 60I; Lid, 602;
Fastener, 2'; Trunk cable, 201'; Protective layer, 20
2'i shielding layer, 203', outer semiconducting layer, 204'; insulating layer, 205', conductor. Agent Patent Attorney Fuji Sato & 1t Procedures D
1. Display of the case 1986 Patent Application No. 28478 2. Name of the invention Structure of cable branch connection body 3. Person making the amendment Relationship to the case Patent Applicant representative Hiroji Hashimoto 6. All drawings covered by the supplement iF. 7. Contents of the amendment as shown in the attached sheet. 8. Catalog drawings of attached documents 1 copy ``- = 2-

Claims (7)

[Claims] (1) A branch connection main body in any form such as T, Y, +, A trunk connection cable connected to each connection element of the branch connection body, a conductor connection sleeve temporarily fixed to the conductor at one end of the trunk connection cable, and a periphery at one end of the trunk connection cable. 1. A structure of a cable branch connection body, comprising an insulating reinforcing body for main line connection and a protection cylinder, which are movably mounted on the top of the cable branch connection body. (2) The structure of the cable branch connection body according to claim (1), wherein the insulation reinforcing body constituting a part of the branch connection body is an insulation tape wrapping layer or an insulation molded body. (3) The structure of the cable branch connection body according to claim (1), in which a cable with excellent flexibility is used as the trunk connection cable. (4) The insulation reinforcing body is a cylindrical body that is formed by laminating a shielding layer, an electric field relaxation layer, an insulating layer, a semiconducting layer, a shielding layer, and a protective layer in order from the inside, and can be heat-shrinkable as a whole. A structure of a cable branch connection body according to claim (1). (5) Claim 1, wherein the protective cylinder is a bottomed cylinder capable of sealing one end of the main line connection cable and the insulating reinforcing body for the main line connection attached to the periphery thereof. Structure of cable branch connection body. (6) The structure of the cable branch connection body according to claim (5), wherein the bottomed portion of the protective cylinder is removable. (7) The structure of the cable branch connection body according to claims (5) and (6), wherein the protective cylinder is a heat-shrinkable cylinder.