JPS5854814A - Structure of straight connection of cable with shield - 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 The present invention relates to a straight connection section of a cable with a shield.

The straight connection part of a conventional shielded cable has a structure as shown in FIG. Wrap it in a tapered shape to create stress cone part 3.
is formed to alleviate the electric field. This connection structure requires considerable skill since the work of wrapping the insulating tape 1 and forming the stress cone part 3 with the tape as described above is required. In addition, the structure of the plug-in linear connection shown in Fig. 2 has stress cone parts 6 and 7 formed in advance on the spacer 4 and the insulating tube 5, and a straight connection is formed by simply inserting these into the cable. However, since the spacer 4 is inserted into the outer periphery of the cable insulator 8,
It has the disadvantage of dimensional limitations. In addition, as a straight connection part other than the above, there is a spacer tape wrapped with many gaps instead of the insulating tape 1 shown in Fig. 1, and the gaps are filled with insulating compound, but it requires skill in injecting the insulating compound. In short, there is a problem similar to that shown in FIG. Furthermore, there is a method in which a heat-shrinkable sleeve with a high dielectric constant is placed over the cable shielding end to alleviate the electric field, but this requires skill in the heat-shrinking work.

As described above, in the conventional linear connection portion of a cable with a heel, there is a difficulty mainly in manufacturing the stress cone portion. SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned difficulties and to provide a connecting section that does not require any specialized skills, is not subject to dimensional limitations, and can be constructed in a compact size.

FIG. 3 shows the structure of the present invention, in which each cable 10 to be connected is stripped in stages and the exposed ends of the conductors 11 are connected by a conductor connecting tube 12, as shown in the figure. Further, an insulating tube 14 is inserted around the exposed cable insulator 13, and an internal electrode 15 is provided at the center of the inner circumference of the insulating tube 14, and this is brought into contact with the conductor connecting tube 16.

Further, an external conductive layer 17 is provided on the outer periphery of the insulating cylinder 14, and a fluid high dielectric constant layer 18 is provided inside the insulating cylinder 14.
(Preferably, dielectric constant ε≧15, specific resistance ρ-10 to 1
0 Ωarl) and elastic plugs 1 at both ends.
9 is inserted. The plug 19 is inserted onto the cable semi-conducting layer 20 exposed on the upper layer of the cable insulation 13 and the shielding layer 21 above the semi-conducting layer 20. Further, a ground wire 22 is wound around the shielding layer 21, and the ground wire 22 is further wound around the outer periphery of the outer conductive layer 17 and connected to the ground wire 22 of the other shielding layer 21.

A waterproof layer 23 is provided around the outer periphery of the external conductive layer 17, and both ends of the waterproof layer 23 are coated around the cable sheath 24.

Further, as shown in FIG. 4, the waterproof layer 23 is formed into a cylindrical shape, and a thread is cut on the outer periphery of the end thereof, and a cap nut 27 is placed over the seven rungs 26 of the spacer 25 fitted on the outer periphery of the sheath 24. Connected to the above screw, blocking plug 19, insulating tube 1
4 and the waterproof layer 23 may be fixed.

As in the case of the connection part of the present invention, the cable insulation and cable shielding layer are exposed by stripping the cable in stages, and an insulating tube is placed around them, and a fluid layer is formed between the insulating tube and the cable. A high dielectric constant compound is filled and closed, and the compound and the barrier layer are electrically connected. Electric field relaxation by high dielectric constant compounds has very good performance, especially when dielectric constant ε≧
15. Those having a specific resistance ρ-10 to 10 ΩC are remarkable, but according to the structure of the present invention, a high-performance electric field relaxation effect can be exhibited by a simple technique of simply filling and closing the compound. Furthermore, since a fluid compound is used, there are no dimensional limitations, and the high dielectric constant compound has a good electric field mitigation effect, so the connection part can be made smaller.

[Brief explanation of the drawing]

1 and 2 are sectional views of a conventional example, FIG. 3 is a sectional view of a connecting portion of the present invention, and FIG. 4 is a sectional view showing a part of another example. DESCRIPTION OF SYMBOLS 10... Cable, 11... Conductor, 13... Cable insulator, 14... Insulating cylinder, 18... High dielectric constant compound, 20... Semiconducting layer, 21... Shinya Hi-tier patent applicant: Sumitomo Electric Industries, Ltd. Agent: Kama 1) Sentence 2(5)-c

Claims (2)

[Claims] (1) The cable insulation and cable shielding layer are exposed by stripping the cable in stages, an insulating tube is placed around them, and a fluid high dielectric constant compound is filled between the insulating tube and the cable, and the gap is closed. A structure of a linear connection part of a cable with a shield, characterized in that the compound and the cable shielding layer are electrically connected. (2) The structure of a linear connection portion of a shielded cable according to claim 1, wherein the high dielectric constant compound has a dielectric constant of 15 or more and a specific resistance of 10 7 to 10 11 Ωσ.