JPS60221984A - Method of producing rubber, plastic insulated 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 an improved method of manufacturing a rubber or plastic insulated cable connection.

Methods for manufacturing connection parts of cross-linked polyethylene insulated cables (hereinafter referred to as CV cables) include an insulating tape wrapping method, a molding method, and a prefabricated 15 method.

6 kv -66 kl When manufacturing the connection part of CV cable, insulating tape method is adopted, but 154
For the manufacture of connections for ultra-high voltage CV cables of kV or higher, there is an opportunity for the molding method to be adopted from the viewpoint of electrical performance.

The molding method uses an insulator made of the same material as the cable insulator and heat-melts it, but we have developed a method for manufacturing molded connections that prevents voids from entering the insulator molding process and allows for stable work. It was hoped that this would come true.

The present invention was made in view of the above situation, and aims to provide a method for manufacturing a rubber or plastic insulated lightning cable connection part that is easy to work on-site, has stable quality, and has excellent electrical properties. be.

The method of manufacturing a rubber/plastic insulated cable connection part of the present invention includes the steps of exposing the end conductors of rubber/plastic insulated cables to be connected to each other and connecting them via a connection sleeve, and The process of forming an internal semiconductive layer, inserting a heat-shrinkable rubber or plastic tube into the insulating layer forming part of the connection part, and further shrinking this to a predetermined size. A step of attaching a mold having a predetermined outer shape of the connection portion on the inner surface to the outer periphery of the rubber or plastic tube, and a pressure insulator in a heat-molten state between the heat-shrinkable rubber or plastic tube and the inner semiconductive layer, The method consists of the steps of press-fitting the tube until it expands and comes into contact with the inner surface of the mold, and then cooling it to form a predetermined mold insulating layer.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a rubber or plastic insulated cable connection portion of the present invention will be described below with reference to the drawings.

First, the end conductors of the CV cables 1 to be connected to each other are exposed and connected through a connection sleeve, and then an internal semiconducting layer 2 is formed on the outer periphery of the connection sleeve using semiconductive polyolefin or semiconductive heat-shrinkable plastic tube. Then, a semiconductive or insulating heat-shrinkable rubber or plastic tube 3 is inserted into the insulating layer forming part of the connection part and contracted to a predetermined size.

This heat-shrinkable rubber, on the outer periphery of the plastic tube 3,
A mold 5 having a predetermined outer shape of the connecting portion on the inner surface is attached, and a press-fitting device 6 and a deaeration hole 4 are communicated with the inner side of the heat-shrinkable rubber or plastic tube 3.

Then, one end of the heat-shrinkable rubber plastic cable 13 is fixed and sealed to the Cv cable 1 through the sealing part 7, and the other end and one end of the mold 5 are fixed and sealed via the sealing part 7. do.

Thereafter, the pressure insulator 8 made of cross-linking agent-containing polyolefin or non-cross-linked polyolefin in the mold 5 and press-fitting device 6 is heated to 140°C to 200°C, and the heat-shrinkable rubber, the inside of the plastic tube 3, and the internal semiconductive layer are heated to 140°C to 200°C. 2. A pressure insulator 8 is inserted into the insulating layer forming part such as the outer peripheral part through a press fitting device 6.
Press in as shown in the arrow.

Therefore, the heat-shrinkable rubber or plastic tube 3 is expanded to the shape of the inner surface of the mold 5, filled with polyolefin, and then cooled to form a predetermined mold connection part.

In this way, the method for manufacturing the rubber/plastic insulated cable connection part of this embodiment involves molding a heat-shrinkable rubber/plastic tube whose outer periphery is formed by heating and press-fitting the polyolefin into the plastic tube. , molded joints with stable quality can be obtained, and on-site work is easy.
Has high electrical properties.

That is, it starts with press-fitting the polyolefin between the heat-shrinkable rubber and plastic tube, which is in a contracted state, and the internal semiconductive layer, and then press-fitting the polyolefin while expanding the tube. It is possible to effectively prevent the mold from being trapped, and therefore to provide a molded joint with stable quality.

Furthermore, by attaching the outer semiconducting layer, the inner semiconducting layer, the insulating layer, and the outer semiconducting layer can be molded at the same time.

Although the above embodiments have been described with respect to the case of a plastic insulated power cable, the operation and effect are the same in the case of a rubber insulated power cable.

As described above, the method for manufacturing a rubber or plastic insulated cable connection part of the present invention allows for easy on-site work;
This has effects such as being able to manufacture a connection part with stable quality and excellent electrical characteristics.

[Brief explanation of drawings]

The figure is an explanatory diagram of an embodiment of the method for manufacturing a rubber or plastic insulated cable connection part of the present invention, and in particular, the figure shows a sectional view of the cable connection part before the insulation layer is press-fitted. Desk 1: CV cable, 2: Internal semiconductive layer, 3: Heat-shrinkable rubber, plastic tube, 4: Deaeration hole, 5: Mold, 6: Press-fit device, 7: Seal part, 8: Press-fit insulator. Agent Patent Attorney Fujio Sato

Claims (1)

[Claims] (1) The process of exposing the end conductors of the rubber and plastic insulated cables that are connected to each other and connecting them via the connection sleeve, the process of forming an internal semiconductive layer on the outer periphery of the connection sleeve, and the process of forming the connection part. A step of inserting a heat-shrinkable rubber or plastic tube into the insulation layer forming part and further shrinking it to a predetermined size, and forming a predetermined outer shape of the connection part on the outer periphery of the heat-shrinkable rubber or plastic tube on the inner surface. Attach the mold with the heat-shrinkable rubber, the pressure insulator that is in a heated molten state between the inside of the plastic duplex and the internal semiconducting layer, and the tube expands to the inner surface of the mold. 1. A method for producing a rubber or plastic insulated electric horn cable connection part, comprising the steps of press-fitting the parts until they contact each other, and then cooling the parts to form a predetermined molded insulating layer.