JP2001286049A - Conductor connecting part and conductor connecting method of strand insulation cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce labor and time necessary for conductor connection work of a strand insulation cable by making the eliminating work of an insulating film unnecessary which work needs labor of sand blast or the like which is necessary for the conventional connection work of a strand insulation cable. SOLUTION: In this conductor connecting method of a strand insulation cable, a cable conductor subjected to strand insulation is cut obliquely, and inserted in a compression sleeve having an oblique contact surface facing the cut cable conductor. After that, the sleeve is compressed, and electric continuity is obtained between the cut surface of the cable conductor and the contact surface of the sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor connecting method of a wire insulated cable using a compression sleeve, and a conductor connecting portion thereof.

[0002]

2. Description of the Related Art In a power cable, when a large alternating current flows through a conductor, the effect of the electromagnetic field of the current itself causes the current to flow near the surface without flowing through the center of the conductor. Works. For this reason, when trying to increase the conductor current value by increasing the conductor size of the cable, the apparent AC resistance increases. Therefore, in recent years, a cable using a wire insulated conductor formed by twisting insulated wires having a large number of enamel insulating coatings is used as a large-capacity power cable or the like.

[0003] In the connection work of power cables, generally, conductors are compression-connected with metal sleeves. However, when such a wire insulated conductor is compression-connected with a sleeve, connection is made. It is necessary to remove the enamel insulating film of each element wire of the conductor terminal to be performed. In such a case, conventionally, after the enamel film is removed by using sandblasting or the like, sleeve compression connection is performed.

In this method, first, an insulating sheath of a cable terminal to be connected is peeled off to expose a wire insulated conductor. Next, a gap is formed between the insulated wires by slightly separating the terminal portions of the insulated wires. Next, the cable end is inserted into a sandblasting device, and sand (grinding particles) such as alumina particles is sprayed, thereby removing the enamel coating from the surface of the strand. Next, after the loosened conductor terminal portions are re-bundled and pre-compressed to adjust the dimensions, the compression connection by the connection sleeve is performed in the same manner as the connection of a cable conductor without ordinary wire insulation. An invention relating to such a method is disclosed in Japanese Patent Application Laid-Open No. 5-916.
14. Further, as a means for removing the insulating film of the strand, a method of immersing it in a chemical solution such as an organic solvent and chemically removing the same is also performed.

[0005]

As described above, the operation of connecting the insulated conductor using the sand blast or the like is very troublesome. In the case of a cable without elementary wire insulation, the connection operation of the cable conductor by the compression sleeve is completed within one hour including the preparation operation. On the other hand, in the case of the insulated wire cable, for each power cable, the conductors are separated, sandblasted, re-bundled and pre-compressed, and then compressed by the compression sleeve. Took more than a day to work. In addition, it is necessary to prepare a large-scale sand blasting device or the like at a construction site where a cable connection operation is performed, and the complexity of the connection operation has been a major problem in applying the wire insulated cable to a power line.

[0006]

An obliquely cut wire insulated cable conductor and an oblique contact surface facing the cut surface of the cable conductor are provided. And a conductor connecting portion of a wire insulated cable comprising a substantially cylindrical compression sleeve.

[0007] As a method of connecting the conductor of such a wire insulated cable, a compression sleeve having a cut surface formed by diagonally cutting a cable insulated wire conductor and having an oblique contact surface facing the cut surface is provided. After the cable conductor is inserted into the compression sleeve, the compression sleeve is compressed to obtain electrical continuity between the cut surface of the cable conductor and the contact surface of the compression sleeve.

According to these means, by compressing and connecting the compression sleeve to the wire insulated cable conductor, the obliquely cut section of the cable and the oblique contact surface of the compression sleeve facing the same are faced to each other. They are closely adhered so that they can be pressed together. As a result, each of the insulated wires constituting the cable conductor comes into contact with the contact surface of the compression sleeve at their cut ends, and the electrical conductivity of each of the insulated wires is ensured. Therefore, despite the fact that the cable conductor has the wire insulation, the conductor connection operation by the compression sleeve can be performed without having to remove the wire insulation.

As a further measure, in order to provide the oblique contact surface in the compression sleeve, a conductive adapter housed inside the compression sleeve and having an oblique contact surface facing the cut surface of the cable conductor can be used.

When the oblique contact surface is formed in the compression sleeve by using the conductive adapter as described above, the conventional compression sleeve body having no oblique contact surface can be used. In addition, by using a conductive adapter separate from the compression sleeve, a material suitable for ensuring conductivity can be used for a portion of the conductive adapter that contacts the cable conductor. For example, even when the compression sleeve body uses semi-hard copper to ensure strength, softer annealed copper can be used for the conductive adapter, and when the compression connection is made, the conductive adapter is plastically deformed and the cable conductor is deformed. Good conduction can be obtained by being in close contact with the cut surface.

[0011]

FIG. 1 shows an embodiment of a conductor connecting portion of an insulated wire cable according to the present invention. FIG.
It is sectional explanatory drawing which shows the Example at the time of providing an oblique contact surface in the compression sleeve itself, without using a conductive conductive adapter. The insulated wire cable has an insulated stranded conductor 1 covered with an insulating layer 2, and has an inner semiconductive layer, an outer semiconductive layer, and a shielding layer (not shown), like the ordinary power cable. Each of the strands constituting the insulated stranded conductor 1 is insulated by enamel coating. The end of the insulated stranded conductor 1 is cut at a certain angle to obtain a flat cutting plane, and a compression sleeve 6 is fitted and compressed to connect a pair of these insulated stranded conductors 1. It is connected. The compression sleeve 6 is made of copper and has a substantially cylindrical shape, and a partition is provided near the center of the inside. By making the partition wall oblique, an oblique contact surface facing the cut surface of the stranded conductor 1 is formed.

FIG. 1B shows an embodiment in which a conductive adapter is used. In this case,
Instead of forming an oblique contact surface directly on the compression sleeve 6,
A conductive adapter 4 is used which has an oblique contact surface which is housed inside the compression sleeve and faces the cut surface of the cable conductor.

An embodiment in which this conductive adapter is used will be described with reference to FIGS. 2 (1) to (6) of FIG. 2 showing a procedure for connecting conductors of an insulated wire according to the present invention.

FIG. 2A shows the appearance of the end of the insulated wire to be connected. In the figure, (a) is an explanatory view of the appearance viewed from the side, and (b) is an explanatory view of the end face of the wire insulated cable viewed from the right in (a). The insulated wire cable has an insulated stranded conductor 1 covered with an insulating layer 2, and has an inner semiconductive layer, an outer semiconductive layer, and a shielding layer (not shown), like the ordinary power cable. Each of the strands constituting the insulated stranded conductor 1 is insulated by enamel coating. In the present embodiment, a segment conductor is used as the insulated stranded conductor 1. As shown in (b), several hundred insulated wires having a thickness of about 1 mm are twisted and then formed into a fan-shaped cross section. To form one segment 1a, and this segment 1a
Are assembled into a stranded conductor 1 having a circular cross section. The inter-segment separation paper 3 is inserted between the segments. As shown in (a), at the end of the wire insulated cable, the insulating layer 2 is stripped off by an appropriate length in order to connect the cable, and the insulated stranded conductor 1 is necessary for the connection work. It is exposed for a certain length.

Next, as shown in FIG. 2 (2), the separation paper 3 between the segments of the exposed portion of the insulated stranded conductor 1 is removed. This operation can be omitted.

Next, after the stranded insulated conductors 1 are re-bundled and shaped, (3) the ends of the insulated stranded conductors 1 are cut at a constant angle to obtain a flat cutting plane as shown in FIG. Disconnect. In order to obtain good electrical continuity of each of the insulated wires by compression, the angle at which the cable conductor is cut obliquely and the angle of the oblique contact surface of the compression sleeve that faces the cable conductor must be perpendicular to the cable axis. It is preferable that the angle be 30 to 60 degrees. In this embodiment, cutting is performed at an angle of 45 degrees with respect to a plane perpendicular to the cable axis. This cutting is carefully done with a cutting wheel to obtain a flat cut surface at a certain angle.

Next, as shown in FIG. 4 (4), the conductive adapter 4 is attached to the cut surface of the insulated stranded conductor 1. The conductive adapter 4 has a shape in which one end of a cylinder is cut off obliquely in a plane, and the angle of the oblique angle
Is set to 45 degrees in accordance with the cut surface of the insulated stranded wire conductor 1. In this embodiment, the conductive adapter 4
There is a small hole at the position of the center axis of
Is temporarily fixed to the cut surface of the insulated stranded conductor 1 through the small hole. The conductive adapter 4 is made of annealed copper and has good electric conductivity and moderate plasticity.

Next, as shown in FIG. 5 (5), a pair of strand insulated cables to which the conductive adapter 4 is attached are inserted into the compression sleeve 6 from both sides. The compression sleeve 6 is used for compression connection of a normal electric power cable, and is made of semi-hard copper having a substantially cylindrical shape, having a partition wall near the center, and having a convex portion on the outer peripheral surface near the center.

Next, as shown in FIG. 6 (6), the insulated stranded conductors 1 of the pair of insulated wires are connected by compressing the compression sleeve 6. At this time, since the cut surface of the insulated stranded conductor 1 is slanted, the force for compressing the sleeve has a component force perpendicular to the cut surface. Accordingly, the cut surface of the insulated stranded conductor 1 and the oblique contact surface of the conductive adapter 4 facing the cut surface are pressed against each other, and each of the insulated strands constituting the insulated stranded conductor 1 is individually The cut ends thereof come into contact with the contact surface of the conductive adapter 4. Insulated stranded conductor 1
Although each of the strands forming the above is provided with an insulating coating made of enamel, each of the strands obtains conduction with the conductive adapter 4. And in these series of work, since it is not necessary to remove the insulation film as in the connection work of the conventional strand insulated cable,
The connection can be performed in the same work time as the connection work of the cable that is not insulated.

Next, as shown in FIG. 7 (7), an insulation reinforcing layer 7 is provided around the conductor connection portion of the thus obtained wire insulated cable, and the cable connection work is completed. For forming the insulation reinforcing layer 7, an extrusion mold joint, a tape mold joint, a prefabricated mold joint, or the like is used as in the case of ordinary cable connection.

In the above description, the procedure for connecting the conductor of the insulated wire according to the present invention using the conductive adapter has been described. However, even when the compression sleeve itself is provided with an oblique contact surface, the conductive adapter is used. Except for the point described above, the same procedure is performed. Further, the present invention is not limited to the embodiments described above. For example, as shown in FIG. 3, when the insulated stranded conductor 1 is cut obliquely, it is cut in a plane from two directions to form a mountain shape. It is also possible to form a valley-shaped contact surface facing the conductive adapter 4.

[0022]

As described above, according to the present invention, even though the cable conductor has the wire insulation, the conductor connection operation by the compression sleeve can be performed without having to remove the wire insulation. Therefore, it is not necessary to remove the insulating film that requires labor by sandblasting or the like, which is required in the connection work of the conventional wire insulated cable, and the labor and time required for the conductor connection work of the wire insulated cable can be reduced. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a conductor connecting portion of an insulated wire cable according to the present invention.

FIG. 2 is an explanatory view showing a procedure of a method for connecting conductors of an insulated wire according to the present invention.

FIG. 3 is an explanatory view showing another embodiment of the conductor connecting portion of the insulated wire cable according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated strand conductor 2 Insulation layer 4 Conductive adapter 6 Compression sleeve

Claims (4)

[Claims] A substantially cylindrical wire insulated cable conductor which is cut obliquely, and a slant contact surface which faces a cut surface of the cable conductor are provided, and are fitted and compression-connected to the cable conductor. Conductor connection part of the insulated wire cable consisting of a compression sleeve. 2. A cable conductor insulated by wire is obliquely cut to form a cut surface, and the cable conductor is inserted into a compression sleeve provided with an oblique contact surface facing the cut surface. A method of connecting a conductor of a wire insulated cable to obtain electrical continuity between a cut surface of the cable conductor and a contact surface of the compression sleeve by compressing the cable conductor. 3. An insulated wire cable conductor cut obliquely, a substantially cylindrical compression sleeve fitted and compression-fitted to the cable conductor, and a cut surface of the cable conductor housed inside the compression sleeve. And a conductive adapter having a diagonal contact surface facing the conductor adapter. 4. A compression sleeve in which a cable conductor having element wire insulation is cut obliquely to form a cut surface, and a conductive adapter having an oblique contact surface facing the cut surface is brought into contact therewith. And then compressing the compression sleeve to obtain electrical continuity between the cut surface of the cable conductor and the compression sleeve.