JPS6339898Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved cable termination connection.

At the cable end connection, waterproofing when pulling out the ground wire connected to the cable shielding layer to the cable sheath side is conventionally done by winding tape with adhesive layer, winding self-fusing tape, or filling with waterproof putty and tape. A combination of windings, etc. is used. However, since the ground wire with a certain thickness or height is placed on the smooth surface of the sheath with a round outer diameter, it is inevitable that a small gap will be created between the sheath and the ground wire, and sufficient waterproofing treatment is required. Can not. or,
When performing waterproofing work using tape wrapping, there are problems such as poor workability in a narrow space and a long time required.

An object of the present invention is to provide a cable termination connection part that can reliably waterproof a ground wire lead-out part in a short period of time.

The object of the present invention is to provide a cable in which a cable sheath, a cable shielding layer, an external semiconducting layer, and an insulating layer are stripped in stages at the terminal end, from the end of the shielding layer to the insulating layer. A heat-shrinkable stress control layer for mitigating an electric field is closely arranged on the periphery of the outer semiconducting layer and the insulating layer, and the outer side has a tapered outer surface that widens downward, and the inner side has a cable sheath. A cylindrical waterproof body that has a cylindrical inner surface with an inner diameter slightly smaller than the outer diameter, a shoulder surface that is moored to the end of the cable sheath, and a small diameter inner surface arranged on the circumference of the shielding layer, and a cylindrical waterproof body that has both ends on the small diameter side of the cylindrical waterproof body. and a ground wire extraction device consisting of a ground wire having a large diameter part in the middle buried inside the waterproof body so as to be exposed on the large diameter side, when the shoulder surface of the cylindrical waterproof body The ground wire is arranged around the cable sheath and the shielding layer so as to be moored at the end thereof, and one end of the grounding wire is electrically connected to the shielding layer. This can be achieved by cable terminations having a protective layer arranged on their periphery.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments illustrated in the accompanying drawings. FIG. 1 is a partial cross-sectional view of a cable terminal connection section of the present invention, and FIG. 2 is a partial cross-sectional view of a ground wire extraction device used in the cable termination section of the present invention.

In the figure, A is a cable formed by stripping a cable sheath 1, a cable shielding layer 2, an external semiconducting layer 3, and an insulating layer 4 sequentially over a predetermined section at the terminal end. 5 is a conductor exposed by peeling off the insulating layer 4. B is a grounding wire take-out device that is held at the end of the cable sheath 1 and placed over the circumference of the cable sheath 1 and the cable shielding layer 2, and as shown in detail in FIG. has a truss-shaped outer surface 7 that widens toward the bottom, and on the inner side there is a cylindrical inner surface 8 whose inner diameter is slightly smaller than the outer diameter of the cable sheath 1 in its final shape, and a shoulder surface 18 that is moored to the end of the cable sheath 1. and a cylindrical waterproof body 6 made of rubber/plastic or heat-shrinkable rubber/plastic having a small-diameter inner surface 9 with an inner diameter slightly larger than the outer diameter of the cable shielding layer 2, and the waterproof body 6 with both ends exposed. It consists of a grounding wire 10 having a large diameter portion 11 in the middle buried inside. However,
The cylindrical waterproof body 6 is fixed to the end of the cable sheath 1 while keeping the interface with the cable sheath 1 airtight. An airtight state is also ensured at the interface between the cylindrical water discharge body 6 and the ground wire 10, preventing water from entering the interface, and the ground wire 10 is connected to the waterproof body 6.
This prevents it from being pulled out. One end of the ground line 10 is electrically connected to the kale shielding layer 2 . 12 is the connection part. Reference numeral 13 denotes a stress control layer for mitigating an electric field, which is disposed from the end of the cable shielding layer 2 to the insulating layer 4 and in close contact with the periphery of the cable shielding layer 2, the external semiconducting layer 3, and the insulating layer 4. This is formed by covering the above-mentioned portion with a heat-shrinkable plastic tube having a predetermined dielectric constant, and further heat-shrinking the tube. The stress control layer 13 for electric field relaxation is
This is intended to alleviate the electric field concentration near the tip of the external semiconducting layer 3, and thereby the electric field concentration in this portion can be effectively alleviated.

Reference numeral 14 denotes a protective layer covering the entire circumference from the tip of the insulating layer 4 to the bottom end of the cylindrical waterproof body 6, including the stress control layer 13, and this includes an insulating heat-shrinkable plastic tube or the like. Are suitable. The protective layer 14 mechanically and electrically protects the entire structure.

As described above, the outer periphery of the cylindrical waterproof body 6 forms a bulge-shaped outer surface 7 that widens downward, so that during rain, water can directly penetrate the grounding wire 10, the buried portion of the waterproof body 6, and the waterproof body. Since it does not touch the interface of the sheath 1 of 6, a higher waterproof effect can be obtained.

15 is a rain cover provided around the protective layer 14 so as to cover the vicinity of the upper end of the stress control layer 13; 16 is a terminal fitting connected to the conductor 5 of the cable; and 17 is a terminal from the end of the protective layer 14. This is a terminal waterproof layer provided over the metal fitting 16.

By configuring the cable end connection using such a grounding wire extraction device B, it is possible to prevent water from entering through the surface of the grounding wire 10,
Furthermore, since water does not come into direct contact with the grounding wire 10 during rain, the anti-tracking characteristics can be significantly improved. In addition, when the rain cover 15 is attached, its barrier effect increases the surface flash voltage against lightning impulses, and this barrier effect is also seen in the waterproof body 6. In the example of the terminal connection of a cable with a working voltage of 15 kV, Approximately 30% higher than the waterproof type.

As mentioned above, rubber, plastic, etc. are used as the waterproof body used in the present invention, but an elastic body is preferable from the viewpoint of fitability to the sheath and airtightness.

Further, by providing an adhesive layer on the inner surface of the waterproof body, further improvement in airtightness can be expected.

As explained above, the cable termination connection section of the present invention has the following effects.

(1) The ground wire extraction section can be waterproofed by the simple operation of fitting the molded ground wire extraction device onto the cable sheath of the cable end connection section.

(2) The work space required to install the ground wire extraction device is small, and the process can be completed in an extremely short time.

(3) Since a dry band is formed by the waterproof body, anti-tracking properties are greatly improved.

(4) The barrier effect of the waterproof body can increase the flash voltage of lightning impulses in particular.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the cable terminal connection section of the present invention, showing a half portion thereof. FIG. 2 is a sectional view showing an embodiment of the grounding wire drawing device applied to the cable terminal connection section of the present invention. 1: cable sheath, 2: cable shielding layer,
3: external semiconducting layer, 4: insulator layer, 5: conductor,
6: Cylindrical waterproof body, 7: Rugged outer surface, 8: Cylindrical inner surface, 9: Small diameter inner surface, 10: Grounding wire, 11: Large diameter part of grounding wire, 12: Connection part of grounding wire, 13: Electric field relaxation 14: Protective layer, 15: Rain cover, 16: Terminal fitting, 17: Waterproof layer for terminal, 18: Shoulder surface, A: Cable, B: Ground wire extraction device.

Claims (1)

[Scope of utility model registration request] At the terminal end of the cable, the cable sheath 1, the cable shielding layer 2, the external semiconducting layer 3, and the insulating layer 4 are stripped in stages, and from the end of the shielding layer 2 to the insulating layer 4, these shielding layers 2, A heat-shrinkable stress control layer 13 for mitigating an electric field is closely disposed on the periphery of the external semiconducting layer 3 and the insulating layer 4, and furthermore, the outer side has a tapered outer surface that widens downward, and the inner side has A cylindrical waterproof body 6 having a cylindrical inner surface 8 with an inner diameter slightly smaller than the outer diameter of the cable sheath 1, a shoulder surface 18 moored to the end of the cable sheath 1, and a small diameter inner surface 9 disposed on the circumference of the shielding layer 2;
A grounding wire extraction device comprising a grounding wire 10 having a large diameter portion 11 in the middle and buried inside a cylindrical waterproofing body 6 with both ends exposed to the small diameter side and the large diameter side of the waterproof body 6. The cable sheath 1 and the shoulder surface 18 of the cylindrical waterproof body 6 are moored to the end of the cable sheath 1, and one end of the ground wire 10 is electrically connected to the shielding layer 2. It is arranged on the circumference of the shielding layer 2, and further an insulating layer 4 is arranged on the circumference of the shielding layer 2.
A cable termination connection part characterized in that a protective layer is arranged on the periphery of the cylindrical waterproof body 6 from the end thereof.