JPH0410296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to insulated connections for rubber and plastic cables.

[Prior Art] An insulated connection part required for cross bonding of a cable line with a long route is constructed by providing an edge cut part around the circumference of a semiconductive layer outside the connection part in the basic structure of a direct connection part.

These edges are electrically discontinuous, resulting in high electrolysis. As a countermeasure, a bell mouth for reducing the electric field or a high dielectric constant or high resistance layer is provided at the cut end, or a thick insulation reinforcing layer is used to prevent the deterioration of insulation performance.

[Problems to be solved by the invention] For this reason, the work is more complicated than for straight connections;
In addition, there were problems such as an increase in the outer diameter of the connecting portion. SUMMARY OF THE INVENTION An object of the present invention is to provide an insulated connection portion of a cable that can eliminate the drawbacks of the prior art described above, simplify the connection work of the edge cut portion, and improve insulation performance.

[Means for Solving the Problems] The gist of the present invention is to provide an internal semiconducting layer on the outer periphery of the conductor.
Using a cable having an insulator, a high-resistance layer, an outer semiconducting layer, a shielding layer, and a sheath, the outer semiconducting layer of one cable is stripped longer than the outer semiconducting layer of the other cable at the insulated connection. One end of the semiconducting layer and shielding layer for the connecting part provided on the outer periphery of the insulating layer for the connecting part is electrically connected to the external semiconducting layer and shielding layer of the other cable, and the semiconducting layer and shielding layer for the connecting part are This is an insulated connection part characterized by providing the other end on the high resistance layer of one cable, and as a more effective one for the same purpose, in addition to the above, an insulated connection part is provided on the outer periphery of the exposed high resistance layer of the edge cut part. There are insulated connections with a heat-shrinkable high-resistance layer and/or an insulating layer, and as an additional advantage, semi-conducting layers for the connections of edge cuts and external connections of the cable. On the edge of the semiconducting layer there is an insulating connection with a shield for electrolytic mitigation.

[Function] In the present invention, by using a cable with a high resistance layer, the high resistance layer can provide a good electric field relaxation effect at the insulated connection portion, thereby preventing a decrease in insulation performance. Furthermore, by applying a heat-shrinkable high-resistance layer and/or an insulating layer to the outer periphery of the edge cut, since the cable itself has a high-resistance layer, there is no need to apply a thick insulation reinforcing layer as in the past. It is easy to install and can provide good insulation. As another means, electric field mitigation shields provided on both semiconducting layers located at both ends of the edge cut portion perform an electric field mitigation test function, thereby achieving the effect of preventing insulation performance from deteriorating.

[Example] This will be explained using figures. FIG. 1 is a partial cross-sectional explanatory view of a cable connection portion showing an embodiment of the present invention. The outer periphery of the conductors 4a, 4b includes an inner semiconducting layer (not shown), an insulator 3a, 3b, a high resistance layer 2a, 2b, an outer semiconducting layer 1a, 1b, a shielding layer 9a, 9b, and a sheath (not shown). At the characteristic cable connection part, the outer semiconducting layer 1a of one cable to be connected is stripped in a step longer than the outer semiconducting layer 1b of the other cable. exposed conductor 4
a, 4b are connected by a conductor connection pipe 5, but the high resistance layers 2a, 2b of the conductor connection part are removed perpendicularly to the axes of the conductors 4a, 4b at the same positions as the insulators 3a, 3b, respectively, to connect the conductors. The electric field at the end of the shield layer 6 provided over the outer periphery of the tube 5 and the high resistance layers 2a, 2b can be effectively relaxed. The shield layer 6 is a semiconductive tape, a heat shrink tube,
Alternatively, a putty-like material is suitable.

Furthermore, a connecting portion insulating layer 7 is provided around the outer periphery of the shield layer 6 and the cable high resistance layers 2a and 2b by winding with an insulating tape, heat-shrinkable tube, heat molding, or the like. A semiconducting layer 8 for a connection and a shielding layer 10 are applied to the outer periphery of the connection insulating layer 7, and one end of both layers is in contact with a semiconducting layer 1b and a shielding layer 9b on the outside of the other cable. , the other is electrically connected to the high resistance layer 2a of one cable.
It will be in the upper position. The length of the high-resistance layer 2a of one cable exposed between the semi-conductive layer 8 for the connection portion located on the high-resistance layer 2a and the outer semi-conductor layer 1a of one cable, that is, the length of the edge cut portion. The length is selected depending on the required insulation performance. In order to further shorten the length of the edge cut, a shield ring 11 (for example, a metal wire, metal tube, or conductive round bar made of rubber or plastic) is installed at the end of the semiconducting layer for the connection part and at the end of the outer semiconducting layer of one cable.・It is effective to use a heat-shrinkable tube (such as a tube) or to cover it with an insulating layer, high-resistance layer, etc. of a heat-shrinkable tube.

Conventionally, the ends of both semiconducting layers at the edge cutting part become highly electrolytic, which causes problems in terms of insulation performance, but with the above configuration, the high-resistance layer of the cable is located below, which improves insulation performance due to a good electric field relaxation effect. can prevent a decrease in

[Effects of the invention] Due to the function of the cable's own high resistance layer, the insulated connection part of a cable with a high resistance layer can use the same parts as the straight connection part, and the outer diameter of the connection part does not increase, making the connection work easier. Not only is this simplified, insulation performance is improved by the high resistance layer, and deterioration in insulation performance can be prevented by the electric field relaxation effect.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the insulated connection part of the present invention. 1a, 1b...external semiconducting layer, 2a, 2b...
High resistance layer, 3a, 3b...Insulator, 4a, 4b...
...Conductor, 5...Conductor connection tube, 6...Shield layer,
7... Connecting part insulating layer, 8... Semiconducting layer for connecting part,
9a, 9b...shielding layer, 10... connection portion shielding layer,
11... Shield ring.

Claims (1)

[Scope of Claims] 1. In an insulated connection part of a cable having an inner semiconducting layer, an insulator, a high resistance layer, an outer semiconducting layer, a shielding layer, and a sheath on the outer periphery of a conductor, the outer semiconducting layer of one cable is Strip off the outer semiconductive layer longer than the other cable's outer semiconductive layer and provide one end of the semiconductive layer and shielding layer for the connection part on the outer periphery of the connection insulating layer and electrically connect it to the external semiconductive layer and shielding layer of the other cable. Furthermore, an insulated cable connection part characterized in that the other end of the semiconducting layer for the connection part and the shielding layer are provided on the high resistance layer of one cable. 2. At the insulated joint of a cable that has an inner semiconducting layer, an insulator, a high resistance layer, an outer semiconducting layer, a shielding layer, and a sheath on the outer periphery of the conductor, the outer semiconducting layer of one cable is connected to the outer half of the other cable. Strip off a layer longer than the conductive layer, and electrically connect one end of the semiconductive layer and shielding layer for the connection part to the outer periphery of the connection insulating layer to the external semiconductive layer and shielding layer of the other cable, and The other end of the semi-conducting layer and the shielding layer is provided on the high-resistance layer of one cable, and a high-resistance layer made of heat-shrinkable material and/or an insulating layer is applied to the outer periphery of the exposed high-resistance layer of one cable. Features a cable insulation connection section. 3. At the insulated connection of a cable that has an inner semiconducting layer, an insulator, a high-resistance layer, an outer semiconducting layer, a shielding layer, and a sheath on the outer periphery of the conductor, the outer semiconducting layer of one cable is connected to the outer half of the other cable. Strip off a layer longer than the conductive layer, and electrically connect one end of the semiconductive layer and shielding layer for the connection part to the outer periphery of the connection insulating layer to the external semiconductive layer and shielding layer of the other cable, and The other end of the semi-conducting layer and the shielding layer is provided on the high-resistance layer of one cable, and the semi-conducting layer for the connection part that contacts the exposed high-resistance layer of one cable and the end of the outer semi-conducting layer of the cable A cable insulated connection part characterized by being provided with a shield body for electrolytic mitigation.