JPS5925521A - 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 The present invention relates to a connection useful in cables, cables, and particularly cables or plastic insulated cables.

The end conductor of the power cable to be connected is connected to the end conductor of the power cable to be connected by sequentially peeling off the ends, the shielding layer, the external conductive layer, and the insulating layer to expose the end f<1-conductor. A high-resistance electric field relaxation cylinder whose end is connected to an external conductive layer and electrically connects it to an external conductive layer. An insulating cylinder provided on the electric field mitigation cylinder, a composite cylinder provided on the insulating cylinder consisting of an insulating inner layer and a conductive outer layer, and an end portion electrically connected to the shielding layer (l). It is known to provide a lightning cape with a shield provided on the composite mass.

In connection parts formed using such fili cylinders, if water intrusion occurs due to external damage to the cable or the outside of the connection part case, the damage will occur between the cable shields or between the A-shielding layer and the external conductor layer. water can enter between the cable insulation and the field relaxation layer, significantly degrading the characteristics of the power cable.

The purpose of the present invention is to fill the space formed by the outer conductive layer and insulating layer of the cable, the end face of the electric field relaxation cylinder, and the inner surface of the composite cylinder with a waterproofing mixture, and to pressurize and hold the mixture by the contraction force of the composite cylinder. An object of the present invention is to provide a power cable connection part which is designed to prevent water intrusion.

Next, an embodiment of the cable connection part of the present invention will be described with reference to the accompanying drawings. In FIG. 15, 1 is a cable conductor, 2 is an insulator, 3 is an extruded external conductive layer, and 4 is a shield. These are successively peeled off to expose the end of the end conductor 1, and connected to each other by a connecting pipe 5. Connecting.

There are two ways of connecting the end conductor and the conductor connecting tube 5: compression connection and soldering connection. A 7-rut cylinder 6 is provided on the periphery of the conductor connecting tube 5 so as to hang over the end of the insulating layer 2 at the thus connected portion. The shield cylindrical body 6 is generally made of a heat-shrink tube made of carbon black-filled ethylene propylene rubber having a volume resistivity of 106 Ω-ω or less, and the heat-shrink tube, which has been inserted in advance around the circumference of the pull, is inserted at the end. After the conductor is connected, it is moved to the circumference of the conductor connecting tube 5, and further heat-shrinked.

In addition, the length of the overlapping insulating layer 2 at both ends of the /-rut cylinder 6 is:
Care must be taken because if this is tampered with and lengthened, the insulation performance of the connection part will be lowered. Based on the experience of the present inventors, it is better to overlap them by a length corresponding to the thickness of the insulating layer 2.

7 has both ends hung over the ends of the shielding layer 4/-ru 1
This is an electric field relaxation cylinder provided around the cylindrical body 6, the insulating layer 2, and the conductive layer 3.The electric field relaxation cylinder 7 is made of ethylene propylene comb containing carbon black having the above-mentioned volume resistivity. made of heat shrink tubing, and this is
-After the bolt cylinder 6 is provided, each part of -FMl'4 (A) is heated and shrunk on the circumference in the same manner as the /-rut cylinder 6.

8 is an insulating cylinder provided on the circumference of the electric field relaxation cylinder 10. The insulating cylinder 8 is an ethylene propylene comb field relaxation cylinder 7
After providing the cylindrical body 7 (and the shield cylindrical body 6), the cylindrical body 7 is heated and shrunk as shown in the figure on the circumference of the cylindrical body 7 in the same manner as the cylindrical body 7 (and the shield cylindrical body 6).

Although one insulating cylindrical force is not used here,
Multiple insulating cylinders may be used to obtain the required insulation thickness.

-9 is an insulating cylindrical body 11 with both ends hanging on the shielding layer 4.
It is a composite cylindrical body provided on the circumference of. This is composed of an insulating inner layer made of irradiation-crosslinked polyethylene and a conductive outer layer made of irradiation-crosslinked polyethylene containing carbon black, which are bonded together in advance.

Furthermore, the composite cylinder 9 is entirely made of a heat-shrinkable tube,
And this is done after the insulating cylinder 8 is provided.
It is constructed by thermally shrinking the circumference of the cylinder 9 in the same manner as (and the Nhölt cylinder 6 and the electric field relaxation cylinder 7). 10 is a copper wire braided body, copper tape wrapped (
- It is a shielding body consisting of one body and a body wrapped with copper wire.

The end of each cylindrical body of heat-shrink tubing extends north above the outer conductor of the cable and does not cover the cable shielding layer. If the cable outer conductor is still formed by wrapping metal tape, it is advisable to strip it off and form a conductive thin layer thereon.

External conductivity as shown. body 3 and electric field relaxation cylinder 7, K.
The edge cylinder 8 and the composite cylinder 9 form a space above the external conductor. According to the invention, this space is filled with a waterproofing mixture. It may be a mixture of insulating, conductive or high-resistance material in the form of waterproof material 1). m of the cylindrical body 9, so that it is completely electrodeposited on the outer conductor 3, the end surfaces of the cylindrical bodies 7 and 8, and the inner surface of the composite cylindrical body 9, which forms a space due to the shrinkage force of the cylinder 9. do.

By doing this, even if water infiltrates between the shielding layers or between the shielding layer and the conductive layer, it will not infiltrate into the connected portion, and the adhesion between the mixture 11 and the outer conductive layer will prevent the water from entering the tube. It does not penetrate into the interface between bodies. In this way, a sufficiently high prevention performance can be obtained.

FIG. 2 shows another embodiment of the present invention. In this embodiment, the width of the insulating cylinder 8 on the electric field relaxation cylinder 7 is made sufficiently large, and the composite cylinder 9 and the cable outer conductor 3 are connected to each other. The space formed between the two is divided into two, and each of these spaces is filled with a preventive mixture.

In either embodiment, the waterproofing compound is provided on the outer conductor layer of the cable, thereby preventing water from entering the cable interface without affecting the electrical performance of the connection. Furthermore, the material for the waterproofing mixture can be selected arbitrarily, and the dimensions of the waterproofing part can be made extremely small due to the compact structure.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the invention, and FIG. 2 is a diagram showing another embodiment of the invention. Cable conductor, 2 Insulator, 3 External conductor, 4 Shielding body, 5 Connecting tube, 6...7 Rut cylinder, 7 Electric field relaxation cylinder, 8 Insulating cylinder, 9 Composite cylinder, 10 Shield, 1
1 Waterproofing mixture.

Claims (1)

[Claims] (D) The end conductor of the power cable to be connected, whose end conductor is exposed by sequentially peeling off the end 7-base, shielding layer, external conductive layer, and insulating layer, is connected to the object to be connected using a conductor connecting pipe. On the conductor connecting tube, there is provided a /-led cylinder, a high-resistance electric field relaxation cylinder whose end is electrically connected to the external conductive layer, an insulating cylinder, and a composite cylinder consisting of an insulating inner layer and a conductive outer layer. The composite cylindrical body is sequentially stacked so that the composite cylindrical body covers the electric field relaxation cylindrical body and the rolled cylindrical body and covers the external conductive layer. An electric cable connection characterized in that a space defined by the outer conductive layer of the cable, the end face of the electric field relaxation cylinder, the end of the rolled cylinder, and the composite cylinder is filled with a waterproof mixture. Department.