JPS6015390Y2 - Power cable insulation connection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an insulated connection part of a power cable.

In a phase-separated η power cable line in which a single-core cable is installed for each phase, it is better to reduce the loss in the sheath circuit by providing an insulated connection part in the middle of each power cable and cross-bonding the sheaths of each phase. It is taken.

Since the insulated connection portion of such a power cable is a location where water damage is likely to deteriorate, it is required to improve reliability.

FIG. 1 shows an example of a conventional power cable insulated connection part.

Both power cables 1, 1' to be connected are provided with a cable internal semiconducting layer (not shown) on the cable conductors 2, 2'.
cable insulation layers 3, 3' made of rubber or plastic;
The cable has a structure in which a cable outer semiconductive layer 4.4' made of semiconductive rubber/plastic, a cable shielding layer 5.5' made of a metal tape wrapping layer, and a cable sheath 6.6' made of rubber/plastic are sequentially provided. The layers are stripped off at the ends to be connected, exposing each layer in turn.

The conductors 2, 2' of both power cables 1.degree. 1' are compressed and connected by a conductive connection sleeve 7A to form a conductor connection portion 7.

A connecting portion internal semiconductive layer 8 is formed on the outer periphery of the conductor connecting portion 7 by winding a semiconductive tape, and a connecting portion insulating layer 9 is formed on the outer periphery of the conductor connecting portion 7 by winding an insulating tape.
, 3'.

A first connection shielding layer 10 is formed on the connection insulating layer 9 near the power cable 1 by winding a metal tape such as lead tape, and one end of this shielding layer 10 is connected to the outer semiconducting layer of the power cable 1. 4 and the shielding layer 5, and are electrically integrated.

The other end of the shielding layer 10 is located on the conductor connection part 7.

A second connection insulating layer 10' is formed on the connection insulating layer 9 near the power cable 1' by winding a metal tape such as lead tape.
is formed, and one end of this shielding layer 10' is connected to the power cable 1.
The outer semiconducting layer 4' and the shielding layer 5' are contacted and electrically integrated.

The other end of the second connection part shielding layer 10' is provided so as to overlap with the first connection part shielding layer 10 with an edge cutting insulating part 13 made of a part of the connection part insulating layer 9 interposed therebetween. , edge insulation of the second connection shielding layer 10.10' is performed.

A waterproof protective layer 11 is provided over the first and second connection portion shielding layers 10.degree. 10' by wrapping a prevention tape or the like so as to straddle the cable sheaths 6, 6' on both sides.

However, in such an insulated connection part, sufficient measures have been taken to prevent water-blocking properties, but the reliability is low.

An object of the present invention is to provide an insulated connection part for a power cable that can improve water-shielding performance.

In the insulated connection part of the power cable of the present invention, the first and second connection part water-shielding/shielding layers are provided on the connection-portion insulating layer and are insulated from each other. This is a laminate material consisting of a metal layer for use with the metal layer and a conductive rubber/plastic layer to close the gap between the metal layers, with the conductive rubber/plastic layer existing at least on the inner surface to improve water-blocking performance. This is what I did.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a first embodiment of the present invention.

In the electrical cable insulating connection part of this embodiment, first and second
The water-shielding/shielding layers 12 and 12' of the connecting portions are separated and insulated from each other by an insulating portion 13.

These water-shielding/shielding layers 12, 12' are particularly suitable for the metal layer 14a.
Using a laminate tape 14 with a conductive rubber/plastic layer 14b made of conductive rubber or conductive plastic laminated on one side of the tape, wrap the tape with the conductive rubber/plastic layer 14b facing inward. It is formed by

Note that the number of wrap layers is not limited to one layer, and multiple layers may be provided.

A waterproof protective layer 11 is provided on these waterproof/shielding layers 12 and 12' in the same manner as described above.

In such an insulated connection part, a water-blocking and shielding layer 12.12'
Since the laminate tape 14 forming the laminate tape 14 is formed of a metal layer 14a and a conductive rubber/plastic layer 14b, the metal layer 14a and the conductive rubber/plastic layer 14b are alternately wrapped as shown in the figure. Even if they are overlapped, they are all conductive, so conduction between each turn can be established, and the shielding effect can be sufficiently suppressed.

In addition, these water-shielding and shielding layers 12 and 12' are formed by the metal layer 14.
In addition to wrapping only with a, elastic conductive rubber
Since the metal layer 14a is wound over the plastic layer 14b, the adhesion between the wound layers is improved, and the water-shielding effect can be sufficiently exhibited.

Furthermore, since the conductive rubber/plastic layer 14b faces inward, the cable shielding layers 5, 5 made of metal tape
Even at the point of contact with ', there is no contact between the metal layer and the metal layer, but rather a contact between the elastic conductive rubber/plastic and the metal layer, and the water-shielding effect can be fully exhibited.

In addition, in the above embodiment, an example was shown in which a single-sided laminated tape was used in which the conductive rubber/plastic layer 14b was laminated on one side of the metal layer 14a, but the conductive rubber/plastic layer 14b could be laminated on both sides of the metal layer 14a. A double-sided laminated tape can also be used.

In addition, the edge cutting insulating part 13 is connected to the first connection part water-shielding and shielding layer 1.
It can also be formed by covering the outer periphery of the end portion of 2 with a heat-shrinkable tube made of an insulating material and shrinking the tube.

3 and 4 show a second embodiment of the present invention.

The insulating connection part of the power cable in this embodiment has a connection part insulating layer 9.
a, the first and second connection portion water-shielding/shielding layers 12.12'
This is the same as in the first embodiment in that they are separated and insulated from each other by edge cutting insulating portions 13.

In this embodiment, these water-blocking/shielding layers 12.12' are formed of first and second laminate heat-shrinkable tubes 15.15'.

These laminated heat-shrinkable tubes 15 and 15' have thin metal layers 15b and 15b' for shielding and water-shielding on the inner surface of the heat-shrinkable tube bodies 15a and 15a', and a thin conductive rubber layer on the inner surface. Plastic layer 15c, 15C
It has a laminate structure with '.

The first laminated heat shrink tube 15 is the electrical cable 1
The tube is placed over the side shielding layer 5, the outer semiconductive layer 4, and the connecting portion insulating layer 9, and is brought into close contact with the outer periphery of each of the above-mentioned parts by the heat shrinkage force of the heat shrink tube main body 15a.

In this case, a metal layer 15b is placed on the metal shielding layer 5 of the power cable 1 via a conductive rubber/plastic layer 15c.
Since the metal layers are overlapped, the gap between the metal layers is closed by the conductive rubber/plastic layer 15c, and the water shielding effect can be improved.

Similarly, a second laminate heat-shrinkable tube 15' is disposed on the shielding layer 5' on the power cable 1' side, the external semiconductive layer 4', the connecting portion insulating layer 9, and the outer periphery of the tip of the first laminate heat-shrinkable tube 15. The heat-shrinkable tube body 15a' is tightly attached to the outer periphery of each part by the heat-shrinking force of the heat-shrinkable tube body 15a'.

In this case as well, since the metal layer 15b' is stacked on the metal shielding layer 5' of the power cable 1' via the conductive rubber/plastic layer 15C', the water shielding effect can be improved.

In this embodiment, the first and second connection portion water-shielding/shielding layers 12.
The edge-cut insulating section 13 between the sections 12' is formed by the heat-shrinkable tube main body 15a of the first laminated heat-shrinkable tube 15.

A waterproof protective layer 11 is placed on these waterproof and shielding layers 12 and 12'.
has been established.

With this structure, the shielding performance of the insulated connection part is
It can be further improved than the example.

As explained above, since the power cable insulating connection part according to the present invention is provided with the water-blocking layer, the water-blocking performance can be improved and the reliability can be improved.

Since this water-shielding layer is formed as a water-shielding and shielding layer, it has the advantage of simplifying the structure of the insulating connection portion.

In particular, in the present invention, the water-blocking and shielding layer is formed of a laminate material of a metal layer and a conductive rubber/plastic layer, so that the conductive rubber/plastic layer is present at least on the inner surface. The metal layers are not directly superimposed,
Since they are layered with elastic conductive rubber or plastic, their water-blocking performance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing only the upper half of a conventional insulated connection part, FIG. 2 is a longitudinal sectional view of only the upper half of the first embodiment of the insulated connection part according to the present invention, and FIG. The figure is a vertical sectional view of only the upper half of the second embodiment of the insulating connection part according to the present invention, and FIG. 4 is a perspective view of the laminated heat-shrinkable tube used in this embodiment. 1.1'...Electric cable, 2,2'...
... Cable conductor, 3, 3'... Cable insulation layer, 5, 5'... Cable shielding layer, 7...
...Conductor connection part, 9...Connection part insulating layer, 11.
...Waterproof protective layer, 12.12'...1st
, second connection part water-shielding and shielding layer, 13... Edge cutting insulating part, 14... Laminated tape, 14a.
...Metal layer, 14b... Conductive rubber/plastic layer, 15.15'... Laminated heat shrink tube, 15a, 15a'... Heat shrink tube Main body, 15 b, 15b'----metal layer, 15 C, 15C'Lea*a* conductive rubber/plastic layer.

Claims (3)

[Scope of utility model registration request] (1) A connection part insulating layer is provided on the outer periphery of the conductor connection part, and a first and a second connection part water-shielding/shielding layer are provided on the connection part insulating layer so as to be insulated from each other, and each of the water-shielding layers is provided on the outer circumference of the conductor connection part. An electrical cable insulating connection characterized in that the shielding layer is formed of a laminate material consisting of a metal layer, conductive rubber, and plastic layer, with the conductive rubber and plastic layers being present at least on the inner surface. Department. (2) The first and second connection portion water-shielding/shielding layers are a laminate tape having a conductive rubber/plastic layer on at least one side of a metal tape, with the conductive rubber/plastic layer facing inward. The electrical cable insulating connection portion according to claim 1, which is formed by being wound around the outer periphery of a connection portion insulating layer. (3) The first and second connection portion water-shielding/shielding layers are made of a laminate heat shrink tube with a metal layer laminated on the inner surface of the heat shrink tube body and a conductive rubber/plastic layer laminated on the inner surface of the metal layer. 2. The electrical cable insulating connection portion according to claim 1, wherein a shrink tube is formed so as to cover the outer periphery of the connection portion insulating layer.