JP2001086632A - Rubber mold connected-area structure for power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber mold connected-area structure for a power cable having a conductor connected-area cover capable of being used regardless of the size of the power cable or the length of the connected area. SOLUTION: This rubber mold connected-area structure for power cable is formed by inserting cable conductors 5 into a connection pipe together for connection, covering the connection pipe 6 and the cable conductor 5 with a conductor connected-area cover 7, and covering the conductor connected-area cover 7 with a rubber mold insulating layer 8, wherein the conductor connected- area cover 7 is formed out of semi-conductive tape wound around the conductor connected-area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable connection structure, and more particularly to a rubber molded connection structure of a crosslinked polyethylene insulated power cable.

[0002]

2. Description of the Related Art In a cross-linked polyethylene insulated power cable generally used as a high-voltage power cable,
The connection portion of the cable is roughly divided into an intermediate connection portion and a terminal connection portion.

[0003] Three types of intermediate connection parts are mainly used: a tape wound connection part, a prefabricated connection part, and a rubber molded connection part.

Since the present invention relates to a rubber-molded connecting portion, a conventional rubber-molded connecting portion structure will be described with reference to FIGS.

FIG. 2 shows a state in which a power cable is connected using a rubber-molded connection, and FIG. 3 is a sectional view of the rubber-molded connection.

As shown in FIG. 2, the ends of the power cables 20, 20 to be connected are treated so that the cable insulator 2
1 is exposed, and a cable conductor 22 protrudes from the cable insulator 21.

The power cables 20, 20 are inserted into the external protection layer 24 from cable introduction portions 24a provided at both ends of an external protection layer 24 constituting the outside of the rubber mold type connection portion 23, and 20, 20 are electrically and mechanically connected to each other.

At this time, the cable insulator 21 is protected by the external protective layer 24.

Next, the structure of the rubber mold type connection portion 23 will be described with reference to FIG.

As shown in FIG. 3, a cable conductor 22 protruding from a cable insulator 21 at an end of the power cables 20 to be connected is inserted into a connection pipe 25 from both ends, and is compressed and connected. , Power cable 20,2
0 are electrically and mechanically connected to each other.

On the outer surface of the connecting pipe 25 and the cable conductor 22 between the cable insulator 21 and the connecting pipe 25, a rubber-molded or metal conductor connecting portion cover 26 covers the connecting pipe 25 and the cable conductor 22. Attached.

On the outer surface of the conductor connection portion cover 26, a rubber mold insulating layer 30 formed in advance at a factory or the like is attached so as to cover the conductor connection portion cover 26.

The rubber mold insulating layer 30 includes an inner semiconductive layer 27 in contact with the outer surface of the conductor connection portion cover 26, an insulating layer 28 located outside the inner semiconductive layer 27, and an outer semiconductive layer 28 located outside the insulating layer 28. An external semiconductive layer 29 is integrally molded.

Further, an external protective layer 24 is provided on the outer surface of the rubber mold insulating layer 30 so that the rubber mold type connecting portion 23 is provided.
Is configured.

The conductor connection tube cover 26 and the inner semiconductive layer 27 of the rubber mold insulating layer 30 are kept at the same potential by the conductor connection portion cover 26.

[0016]

However, since the conventional conductor connection portion cover is a molded product, the size of the power cable of each size and the length of the connection portion are precisely adjusted for each size of the power cable. However, there is a problem that the conductor connection portion cover having the above-mentioned size must be formed, which increases the cost.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a rubber molded connection part for a power cable having a conductor connection part cover that can be used regardless of the size of the power cable or the length of the connection part. It is to provide a structure.

[0018]

In order to achieve the above object, according to the first aspect of the present invention, cable conductors protruding from a cable insulator at an end portion of a power cable are inserted into the connection pipe from both ends of the connection pipe. After connecting, the connection pipe and the cable conductors at both ends of the connection pipe are covered with a conductor connection part cover, and the conductor connection part cover is further covered with a rubber mold insulation formed of an inner semiconductive layer, an insulating layer and an outer semiconductive layer. In the rubber-molded connection structure for a power cable constituted by covering with a layer, the conductor-connection portion cover is a rubber-molded connection structure for a power cable formed by a semiconductive tape wound around the conductor connection portion. .

According to a second aspect of the present invention, the conductor connecting portion cover
2. The power cable for a power cable according to claim 1, wherein a semiconductive rubber tape whose length in the width direction is substantially equal to the length of the cable conductor at both ends thereof is wound around the outer surface of the connection tube and the cable conductor. This is a rubber mold type connection structure.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a rubber molded connection for a power cable according to the present invention.

As shown in FIG. 1, in the power cable rubber-molded connection section 1, the power cables 2 to be connected are introduced into the external protection layer 3 from the cable introduction section 3a provided in the external protection layer 3. The power cables 2 are electrically connected to each other by inserting the cable conductors 5 projecting from the cable insulators 4 at the ends of the power cables 2 and 2 from both ends into the connection pipe 6 and compressing and connecting them. Mechanically connected.

A conductor connecting portion cover 7 is attached to the outer surface of the connecting pipe 6 and the cable conductor 5 between the cable insulator 4 and the connecting pipe 6 so as to cover the connecting pipe 6 and the cable conductor 5.

The gist of the present invention is this conductor connection portion cover 7, and the conductor connection portion cover 7 is formed by winding a semiconductive rubber tape to form a laminate.

The semiconductive rubber tape has a length in the width direction substantially equal to the length of the connecting pipe 6 and the length of the cable conductor 5 at both ends thereof, and the rubber tape is wound around the outer surface of the connecting pipe 6 and the cable conductor 5. Thus, the conductor connection portion cover 7 is formed.

On the outer surface of the conductor connection portion cover 7, a rubber mold insulating layer 8 formed in advance at a factory or the like is attached so as to cover the conductor connection portion cover 7.

The rubber mold insulating layer 8 includes an inner semiconductive layer 9 in contact with the outer surface of the conductor connection portion cover 7, an insulating layer 10 located outside the inner semiconductive layer 9, and an outer semiconductive layer 9 located outside the insulating layer 10. The external semiconductive layer 11 is integrally molded.

The conductor connection tube 6 and the inner semiconductive layer 9 of the rubber mold insulating layer 8 are kept at the same potential by the conductor connection portion cover 7 formed of a rubber tape.

Further, an outer protective layer 3 is provided on the outer surface of the rubber mold insulating layer 8 to constitute a rubber mold type connection portion.

By forming the conductor connection portion cover 7 by winding a semiconductive rubber tape, it is possible to cope with connection portions of power cables of various sizes.

By wrapping the rubber tape, the diameter of the gap between the connection pipe 6 and the cable conductor 5 and the conductor connection portion cover 7 can be easily adjusted as compared with a molded product.

[0032]

In summary, according to the present invention, since the conductor connection portion cover is formed by winding a semiconductive rubber tape, it can be applied to connection portions of power cables of various sizes. Therefore, it is not necessary to form the conductor connection portion cover in accordance with the size of the power cable, so that cost reduction can be realized.

Further, by wrapping the rubber tape, the diameter of the gap between the connection pipe and the conductor and the conductor connection portion cover can be easily adjusted as compared with the molded product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rubber molded connection for a power cable according to the present invention.

FIG. 2 is a diagram illustrating a state in which a power cable is connected using a rubber mold type connection unit.

FIG. 3 is a cross-sectional view of a conventional rubber mold type connection portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber-molded connection part for power cables 2 Power cable 5 Cable conductor 6 Connection tube 7 Conductor connection part cover 8 Rubber mold insulation layer

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoichi Watanabe 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture F-term in the Hidaka Plant of Hitachi Cable, Ltd. (reference) 5G375 AA02 BA27 BB43 BB45 CA02 CA14 CB04 CB07 CB21 CB38 CB46 CB53 CB55 DB32

Claims (2)

[Claims] A cable conductor protruding from a cable insulator at an end of a power cable is inserted into a connection pipe from both ends of the connection pipe and connected, and the connection pipe and the cable conductors at both ends of the connection pipe are connected to a conductor connection section. Covered with a cover, further, in a rubber molded connection structure for a power cable constituted by covering the conductor connection portion cover with a rubber mold insulation layer composed of an inner semiconductive layer and an insulating layer and an outer semiconductive layer, A rubber-molded connection structure for a power cable, wherein the conductor connection portion cover is formed of a semiconductive tape wound around the conductor connection portion. 2. The conductor connecting portion cover is formed by winding a semiconductive rubber tape whose length in the width direction is substantially equal to the lengths of the connecting pipe and the cable conductors at both ends thereof around the outer surfaces of the connecting pipe and the cable conductor. The rubber molded connection structure for a power cable according to claim 1, which is formed.