JPS61170219A - Cable insulating connecting section - 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 [Field of Industrial Application] The present invention relates to an insulated connection part for rubber or 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 straight 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, there are problems such as the work is more complicated than in the case of a straight connection, and the outer diameter of the connection becomes larger.

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] Summary 1 of the present invention is to use 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, and to insulate the cable. At the connection part, strip the outer semiconducting layer of one cable longer than the outer semiconductor layer of the other cable, and crotch it to the outer periphery of the insulating layer of the connection part, and one end of the M shielding layer for the connection part. is electrically connected to the outer semiconducting layer and shielding layer of the other group, and the semiconducting layer for the connection part,
This is an insulated connection part characterized by providing the other end of the shielding layer on the high-resistance layer of one cable, and as a more effective one for the same purpose, in addition to the above, the outer periphery of the exposed high-resistance layer at the edge cut part a high resistance layer consisting of heat shrinkable and/or
There are insulating connections with an insulating layer, and as another advantage, in addition to the above, a semi-conducting layer for the connection of the edge cut and a shield for electrolytic mitigation on the end of the outer semi-conducting layer of the cable. There is an insulated connection between the body and the crotch.

[Function 1] By using a cable with a high-resistance layer, the present invention provides a good electric field relaxation effect at the insulated connection portion due to the high-resistance layer, thereby preventing deterioration of insulation performance. Furthermore, applying a heat-shrinkable high-resistance layer and/or an insulating layer to the outer periphery of the edge cut is simple because the cable itself has a high-resistance layer, so there is no need to apply a thick insulation reinforcing layer as in the past. It can be installed and has an insulation effect. As another means, electric field mitigation shields provided on the conductive layers on both ends located at both ends of the edge cut portion function to alleviate the electric field, thereby preventing deterioration of insulation performance.

[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. conductor 4a,
An internal semiconducting layer (not shown) and insulators 3a and 3 are provided on the outer periphery of 4b.
b High resistance layers 2a, 2b external semiconducting layers 1a, 1b shielding layer 9
At the joint of a cable characterized by having a, 9b and a sheath (not shown), the outer semiconducting layer 1m1a of one cable to be connected is stripped in a step longer than the outer semiconducting layer 1b of the other cable. Exposed conductor 4a14b
are connected by a conductor connecting tube 5, but the high resistance layers 2a, 2b of the conductor connecting portion are removed perpendicularly to the axes of the conductors 4a, 4b at the same positions as the insulators 3a, 3b, respectively. Also, the electric field at the end of the shield layer 6 provided over the outer periphery of the high resistance layers 2a, 2b can be effectively relaxed.

The shield layer 6 is made of semiconductive tape, heat shrink tube,
Alternatively, a putty-like material is suitable.

Furthermore, the shield layer 6 and the cable high resistance layers 2a, 2
A connecting portion insulating layer 7 is provided on the outer periphery of b by winding 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 shield @9b on the outside of the other cable. ,
electrically connected, and the other is the high resistance layer 2a of one cable.
It will be located at the top. The length of the high resistance layer 2a of one cable exposed between the connection semiconducting layer 8 located on the high resistance layer 2a and the one cable external semiconducting layer 18, that is, the length of the edge cut portion. The thickness 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, a metal tube, or a 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 cover it with an insulating layer, high-resistance layer, etc. of a heat-shrinkable tube.

Conventionally, the ends of the amphibatic conductive layer at the edge cutting part become highly electrolytic, causing a problem in insulation performance, but with the above configuration, since the ends of the cable are at or below the high resistance layer of the cable, they have a good electric field relaxation effect, which improves insulation performance. Deterioration can be prevented.

[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 1. Deterioration of insulation performance can be prevented due to the electrolytic relaxation effect.

[Brief explanation of the drawing]

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... Connection part insulating layer, 8... Connection part semiconducting layer, 9a, 9b... Shielding layer, 10... Connection part shielding. Layer, 11... Shield ring.

Claims (3)

[Claims] (1) An internal semiconducting layer, an insulator, a high resistance layer on the outer periphery of the conductor,
At the insulated connection part of a cable that has an external semiconducting layer, a shielding layer, and a sheath, the external semiconducting layer of one cable is stripped in a step longer than the outer semiconducting layer of the other cable, and the connection is provided on the outer periphery of the insulating layer of the connection part. One end of the semiconducting layer and shielding layer for the connecting part is electrically connected to the external semiconducting layer and shielding layer of the other cable, and the other end of the semiconducting layer and shielding layer for the connecting part is connected to the high resistance layer of one cable. A cable insulated connection part characterized in that it is provided on the top. (2) An internal semiconducting layer, an insulator, and a high resistance layer on the outer periphery of the conductor,
At the insulated connection part of a cable that has an external semiconducting layer, a shielding layer, and a sheath, the external semiconducting layer of one cable is stripped in a step longer than the outer semiconducting layer of the other cable, and the connection is provided on the outer periphery of the insulating layer of the connection part. One end of the semiconducting layer and shielding layer for the connecting part is electrically connected to the external semiconducting layer and shielding layer of the other cable, and the other end of the semiconducting layer and shielding layer for the connecting part is connected to the high resistance layer of one cable. 1. A cable insulated connection part characterized in that a heat-shrinkable high-resistance layer and/or an insulating layer are provided on the outer periphery of the exposed high-resistance layer of one cable. (3) An internal semiconducting layer, an insulator, and a high resistance layer on the outer periphery of the conductor,
At the insulated connection part of a cable that has an external semiconducting layer, a shielding layer, and a sheath, the external semiconducting layer of one cable is stripped in a step longer than the outer semiconducting layer of the other cable, and the connection is provided on the outer periphery of the insulating layer of the connection part. One end of the semiconducting layer and shielding layer for the connecting part is electrically connected to the external semiconducting layer and shielding layer of the other cable, and the other end of the semiconducting layer and shielding layer for the connecting part is connected to the high resistance layer of one cable. A cable insulated connection part characterized in that an electrolytic mitigation shield is provided on a semiconducting layer for a connection part provided above and in contact with an exposed high-resistance layer of one cable, and on an end of the external semiconducting layer of the cable. .