JPS60219912A - Power cable connector - 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 [Background and Objects of the Invention] The present invention relates to electrical horn cables, and particularly to connections for rubber/plastic electrical cables.

Generally, when connecting this type of cable, the step stripping work of the end wave iI layer of the cable is all done manually by skilled workers using tools such as knives, glass pieces, saws, etc. It is being said.

On the other hand, when looking at this type of connection from an electrical point of view, the strongest electric field is near the end of the cable's external semiconducting layer and near the shield layer provided on the circumference of the conductor connection. Therefore, if the cable insulation layer is scratched with a knife during the previous stage stripping process, or if unevenness is formed on the surface of the shield layer, the insulation performance of the cable connection part will be significantly reduced. For this reason,
This type of work requires skilled work with a high level of technology.

However, due to the recent shortage of skilled workers, there has been a desire to develop cable connections that can be installed in a short time even by unskilled workers without deteriorating performance.

The present invention has been made in view of the above situation, and it is an object of the present invention to provide a cable connection part that can obtain a good electric field relaxation effect without requiring sophisticated working techniques.

[Summary of the Invention] That is, the gist of the present invention is to use a cable in which an inner semiconducting side insulating layer, a high resistance layer, an outer semiconducting layer, a shielding layer, and a sheath are sequentially formed on a conductor. The sheath, shielding layer, external semiconducting layer, and insulating layer at the end are sequentially stripped off leaving the high-resistance layer, and the high-resistance layer is further removed in a tapered shape toward the tip of both cable conductors to avoid exposure. The present invention is constructed by sequentially forming a shield layer, a high resistance layer for a connection part, an absolute RWI, and an external semiconducting layer on the periphery of a cable conductor connection part formed by connecting cable conductors.

[Embodiment] Next, an embodiment of the power connection part of the present invention will be described with reference to the accompanying drawings, in which 1 each has a sheath (omitted) at its own end, a shielding layer 2, an external semiconducting 1i3 and an insulating 1i15. High resistance 1! Rubber/plastic electric cables to be connected to each other are obtained by sequentially stripping the high resistance layer 4 and the insulation 1: J5 in a tapered manner from the external semiconducting layer 3 side toward the cable tip side, leaving t4. It's a cable.

In addition, although the high resistance layer 4 and the insulating layer 5 are removed in a tapered shape here, this may be performed only for the high resistance layer 4.

External semiconductor 1i! The length of the high-resistance layer 4 left in communication with g3 may be at least 10% of the length of the insulating layer 5 (ie, the length from the end of the external semiconducting layer 3 to its own tip). In other words, the desired electric field relaxation effect can be expected at the end portion of the external semiconducting layer 3 if only this amount is required.

Reference numeral 7 denotes a conductor connecting tube that connects the ends of the conductors 6 of both cables 1 exposed as described above.

Reference numeral 8 denotes a shield layer provided over the outer periphery of the ends of the conductor connection tube 7 and both cable insulation N5, for example, a conductive putty-like material, tape, heat-shrinkable tube, etc. is used for this. .

Reference numeral 9 designates a high-resistance layer for connecting portions provided over the outer periphery of the end of the shield layer 8, both cable insulation layers 5, both cable high-resistance sheaths 4, both cable external semi-conducting electric cabinets 3, and both cable shielding sheaths 2. . This high-resistance layer 9 may be made of, for example, putty-like material, tape, etc.
A heat-shrinkable tube or the like can be used, but it is preferable to use a heat-shrinkable tube because it is easy to install and can effectively prevent entrapment of voids.

Further, the electrical resistance of the high resistance layer 9 has a volume resistivity of 108 to 1
It is preferable to set it to 013Ω-α. Volume resistivity 107Ω-α
If it is less than 1014 Ω-Cm, it will become semi-conductive and there is a risk of heat generation, and if it is more than 1014 Ω-Cm, it will become like an insulator and a sufficient electric field relaxation effect cannot be expected. After all, the volume resistivity is 10 to 10
A good electric field relaxation effect can be expected when the resistance is 13 Ω-cm.

Reference numeral 10 denotes an insulating layer for a connection portion having a predetermined thickness and provided on the circumference of the high-resistance layer 9. For example, a twisted layer of insulating tape or a laminated layer of heat-shrinkable tubes may be used for this purpose, but the one on the rear right is preferable in terms of workability.

11 is provided on the insulating layer 10 with both ends thereof in contact with the cable shielding layer 2 (this is an external semiconductive layer for the connection part, for example, a semiconductive tape is wrapped around it). A composite tube made of a heat-shrinkable tube, a semiconductive heat-shrinkable tube, or a semi-conductive heat-shrinkable tube integrally installed around the outer periphery of an insulating heat-shrinkable tube is used.

[Effects of the Invention] According to the electric power cable connection section of this embodiment constructed in this manner, the cable high resistance layer provided in advance on the cable is used as an electric field relaxation layer at the end of the cable external semiconducting layer. Therefore, even if there is some peeling or void entrapment hq electrical defect near the edge of the external semiconducting layer, effective electric field relaxation can be achieved and the problem can be solved in practice. Furthermore, since the couple high resistance layer is tapered off toward the tip side, the part surrounded by the three layers, the cable high resistance layer, the cable insulation R layer, and the high resistance layer for the connection part, is completely removed. This results in a close contact state, which results in a structure that is even more free from electrical defects. If the tip of the cable high-resistance layer has a surface perpendicular to the cable axis, a gap will be created in the area surrounded by the three layers, and this area will become electrically unstable. It is easy to become a defective point.

As described above, the present invention can provide a power cable connection portion having excellent electrical performance without requiring particularly sophisticated working techniques, and can be said to have extremely great practical value.

[Brief explanation of the drawing]

The figure is a vertical sectional view of the upper half of an embodiment of the unexploded #J power cable connection section. 1: Cable, 2: Cable shielding layer, 3: Cable external semiconductor NWi, 4: Cable high resistance layer, 5: Cable insulation layer, 6: Cable conductor, 7: Conductor connection tube, 8: Seal l
'lL9: High resistance layer for connection part, 1Q: Disconnection RF for connection part
J, 11: External semiconductor 'IrX layer for connection section.

Claims (2)

[Claims] (1) A cable to be connected in which an inner semiconducting layer, an insulating layer, a high resistance layer, an outer semiconducting layer, a shielding layer, and a sheath are sequentially formed around the outer periphery of a conductor, and a sheath-1 shielding at the end of the cable. layer, external semiconductor? ! ! The layers and insulating layers are sequentially stripped leaving the high-resistance layer, and the high-resistance layer is removed in a tapered manner from the external semiconducting layer toward the cable tip, and both exposed cable conductors are connected to each other. a conductor connecting tube, a shield layer formed over the outer periphery of the end of the conductor connecting tube and both cable insulation layers, the shield layer, both cables high resistance layer, both cables external half η'fri layer, and both cables. It is characterized by comprising a high resistance layer for a connection part formed across the outer periphery of the end of the shielding layer, and an insulating layer for a connection part and an external semiconductive layer formed in sequence around the outer periphery of the high resistance layer for a connection part. Puru salt cable connection part. (2) The salt cable connection portion according to claim 1, wherein the cable connection portion is tapered across the cable high-resistance layer and the cable insulation layer.