JPH09247837A - Insulated type linear connecting part of power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly reliable inexpensive insulated type linear connecting part, by providing a separation part of the outer semi-conductive layers of a cable adjacently to an ordinary type linear connecting part, and by so mounting on the cable a separation rubber unit formed out of an insulation rubber and semi-conductive rubbers integratedly with each other that it bestrides the separation part. SOLUTION: A connecting main-body part comprising a conductor connecting part 3, a spacer 4 and a rubber mold unit 5 is formed out of the same constituent parts as an ordinary type liner connecting part 10. Removing one part of an outer semi- conductive layer 1 of a cable in the adjacent place to the connecting main-body part, a separation part 1a is so provided that a separation rubber unit 20 formed out of an insulation rubber 21 and semi-conductive rubbers 22a, 22b integratedly with each other is mounted on the cable, so as to bestride the separation part 1a to from the separation part of shielding layers. That is, most of the central part of the outer surface of the separation part 1a is covered with the insulation rubber 21 to withstand a surge voltage generated between the shielding layers and on its inner surface the two separated semi-conductive rubber parts 22a, 22b from each other are exposed to the outside at both ends thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating type linear connecting portion of a rubber or plastic power cable such as a CV cable.

[0002]

2. Description of the Related Art FIG. 2 is a vertical cross-sectional view of a main part of an example of a normal type straight connecting portion of a power cable. In the drawings, 1 is an outer semiconductive layer of the cable, 2 is a cable insulator such as cross-linked polyethylene, 3 is a cable conductor connecting portion that is compression-connected using a sleeve, and 4 is a spacer that covers the conductor connecting portion 3. Is. On the outside of the cable conductor connecting portion 3, there is provided an internal electrode 7 having an inner peripheral surface exposed and embedded inside an insulating rubber body 6, and a semiconductive layer 8 on the outer peripheral portion. 5 is located. The rubber mold unit 5 has an inner diameter smaller than the outer diameter of the cable insulator 2, and is inserted into the cable insulator 2 by a known method using a diameter-expanding jig, and the elastic compression force of rubber is applied to the cable insulator 2. They are brought into close contact with each other to form a connecting portion insulating portion.

FIG. 3 is a vertical cross-sectional view of a main part of an example of an insulating type linear connecting portion of a conventional power cable. In the drawing, the same reference numerals as those in FIG. 2 represent the same parts. The insulating type linear connecting portion is different from the above-mentioned ordinary type linear connecting portion 10 in that the semiconductive layer 8 of the rubber mold unit 5 covers the entire outer circumference of the insulating rubber body 6 in the ordinary type linear connecting portion 10. , In the insulated type straight connection part, the external semiconductive layer is formed into two parts 8a,
The rubber mold unit 9 with the edge cut 8c is attached to 8b.

[0004]

As described above, in order to form the conventional insulated type linear connecting portion, the edge cutting portion 8c different from the rubber mold unit 5 of the ordinary type linear connecting portion 10 as shown in FIG. The rubber mold unit 9 having However, since the rubber mold unit 9 having such an edge cutting portion 8c has a complicated structure, it is more difficult and expensive to design and manufacture the mold as compared with the rubber mold unit 5 used for the normal type linear connecting portion 10. On the other hand, in a normal power cable line, a normal type straight line connection part and an insulated type straight line connection part coexist, so it is necessary to provide two types of straight line connection parts sets to form one power cable line, especially for the connection part. In the case of a small number of lines, there is a problem that the manufacturing cost per set becomes extremely high.

[0005]

SUMMARY OF THE INVENTION The present invention overcomes the above-referenced problems and provides an inexpensive insulated straight line connection, which is characterized by the outer half of the cable adjacent to the normal type straight connection. Providing an edge cut portion of the conductive layer and straddling the edge cut portion,
An insulating type linear connecting portion of an electric power cable formed by mounting an edge cutting rubber unit in which an insulating rubber and a semiconductive rubber are integrally formed.

[0006]

1 is a longitudinal sectional view of a main part of an embodiment of an insulating type linear connecting portion of the present invention. In the drawings, the same reference numerals as those in FIG. 2 represent the same parts. The connection main body portion formed by the conductor connection portion 3, the spacer 4 and the rubber mold unit 5 is formed in the same manner by using the same components as those of the normal type linear connection portion 10 shown in FIG. The outer semiconductive layer 1 of the cable is removed at a position adjacent to the connection body portion thus formed to provide the edge cut portion 1a, and the insulating rubber and the semiconductive rubber are integrally molded so as to extend over the edge cut portion 1a. The edge cutting rubber unit 20 is attached to form the edge cutting portion of the shielding layer.

The edge cutting rubber unit 20 is made of insulating rubber 2.
1 and a semiconductive rubber 22 are integrally molded to have a cylindrical basic shape. Most of the center of the outer surface is covered with insulating rubber 21 so as to withstand the surge voltage generated between the shield layers, and the inner surface has two semiconductive rubber portions 22a and 22c that are edge-cut 22c exposed at both ends. As described above, when the cable is mounted over the edge cut portion 1a of the cable outer semi-conductive layer 1, the end portions of the edge cut portion 1a of the outer semi-conductive layer 1 are in close contact with each other. Also, between the exposed portions of the two semi-conductive rubber portions 22a and 22b on the inner surface, it is necessary to have an appropriate length of the exposed portion of the insulating rubber 21 so as to withstand the above surge voltage while being attached to the cable. The two semiconductive rubber portions 22a and 22b have a structure in which they are concentrically overlapped in the central portion so as to shield an AC operating electric field in a state where the edge cutting 22c is performed.

[0008]

As described above, according to the insulating type linear connecting portion of the power cable of the present invention, the insulating type linear connecting portion is formed only by adding the edging rubber unit to the parts set of the ordinary type linear connecting portion. To be done. By using the edge-cutting rubber unit in this way, the same type of components and the same construction method can be applied to the normal type linear connecting part in the connection main body part, and it is possible to obtain an insulating type linear connecting part that is significantly cheaper and more reliable than the conventional one. . Although the above description has been made on the plug-in type linear connecting portion, it goes without saying that the present invention can be applied to an insulating type linear connecting portion of another type such as a compression prefabricated type.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of an insulating type linear connecting part of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of an example of a normal type linear connection part.

FIG. 3 is a vertical cross-sectional view of a main part of an example of a conventional insulated type linear connection part.

[Explanation of symbols]

 1 Cable Outer Semi-Conductive Layer 1a Edge Cut Part 2 Cable Insulator 3 Conductor Connection Part 4 Spacer 5 Rubber Mold Unit 10 Normal Type Straight Connection Part 20 Edge Cut Rubber Unit 21 Insulation Rubber 22a, 22b Semi Conductive Rubber 22c Edge Cut Part

Claims (2)

[Claims] 1. An edge-cutting rubber unit in which an insulating rubber and a semi-conductive rubber are integrally formed so as to straddle the outer semiconductive layer of the cable by providing an edge cutout adjacent to the normal type straight connecting portion. Insulated straight connection part of power cable characterized by being mounted. 2. The edging rubber unit has a cylindrical basic shape formed by integrally molding an insulating rubber and a semiconductive rubber, and most of the center of the outer surface is covered with the insulating rubber. 2. The insulation of a power cable according to claim 1, wherein the structure has a structure in which it is cut into two parts, exposed at both ends of the inner surface, and concentrically overlapped with each other through an insulating rubber in the central part. Mold straight line connection.