JPH0963661A - Connecting method of power cable divided conductors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the connecting time of cable conductors by cutting the segments of divided conductors exposed from cable terminals, at the different positions, and crimp-connecting with insertion of a sleeve having substantially the same diameter to the cutting ends. SOLUTION: Insulators 12 at the ends of power cables 1a and 1b to be connected are removed, and divided conductors 10 with required lengths from the terminals are exposed. After the conductors are exposed, markings 13 are applied to the plural lines of segments 11 formed by compression forming the strands to compose the divided conductors 10, not to superpose the connections of the segments with the same stranding phase each other, and furthermore, a binding is applied to prevent a loosening of strands. Then, the segments are cut at the marked positions, and a sleeve 14 with substantially the same diameter is inserted and compressed to the cutting ends of the segments at both ends. Then, the connected segments 11 are returned to specific positions, and the divided conductors 10 are regulated again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a split conductor of a power cable, and more particularly to a factory joint (hereinafter referred to as FJ) in which the outer diameter of the connecting portion is substantially the same as the outer diameter of the cable conductor.
Said) regarding the conductor connection method.

[0002]

2. Description of the Related Art Generally, power cables (hereinafter simply referred to as "cables") can be manufactured only for a finite length due to limitations in manufacturing equipment capacity, transportation weight, size, etc. An FJ that connects the conductors with the same diameter is required for shipping and then laying afterwards.

The types of conductor connection methods include a compression connection method using a sleeve, a welding connection method using electricity or gas, and a soldering connection method.

The FJ section is required to be flexible because it receives a history of bending, pulling and the like during transportation from the factory after shipment and installation of a wire. The connection of the divided conductors meets this requirement by adopting a welding connection method for each segment (one division is called a segment).

[0005]

The above-mentioned conductor welding connection method is advantageous in that it can secure sufficient tensile strength.
Flexibility is obtained in the conductor. Although it is possible to connect the cable with the same diameter as the cable conductor, there are the following problems.

(1) The conductor connecting process requires a long time (20 to 30).
It takes more than time).

(2) The conductor resistance increases due to the influence of the material (phosphorus copper solder, silver solder, etc.) used for the conductor connecting portion.

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, a welding connection for each segment, which has been conventionally performed for connecting a divided conductor of an FJ, is compression-connected by using a quasi-same diameter sleeve.

Here, the quasi-same diameter sleeve is about 15% thinner than the standard sleeve.

That is, the divided conductors of the end of the cable to be connected are exposed, and the segments are cut at predetermined positions so that the sleeve compression portions of the segments do not overlap with each other. Insert the diameter sleeve, compress it, and connect.

Since this connection method is a sleeve connection which is usually performed at the connection portion of the current construction, the time required for conductor connection is as short as about 1 to 3 hours. The conductor resistance is also reduced to the same level as the cable, or to the extent that the total cross-sectional area increases.

Further, since the sleeves are compressed for each segment and the sleeve connection positions are arranged so as not to overlap each other, the flexibility is maintained and the diameter expansion of the divided conductors can be prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a cross section of a divided conductor according to the present invention. Although this example of the divided conductor is applied to the CV cable, it is needless to say that the example is also applicable to the divided conductor having the oil passage in the center of the OF cable.

The divided conductor 10 is composed of five segment conductors 1.
It is composed of 1.

The construction method of, for example, an FJ of a submarine cable having the above-described divided conductor structure will be described with reference to FIGS. 1 and 3.

FIG. 3 is a flow chart for explaining the sleeve connection process for each segment of the divided conductor.

FIGS. 1A, 1B and 1C are perspective views showing a state of sleeve connection for each segment.

Submarine cables 1a and 1b to be connected
A conductor is exposed to expose a conductor of a required length from the terminal (step S1). At the conductor outlet,
As shown in (3), the connecting portion position is marked 13 so that the sleeve connecting portions of the respective segments do not overlap (step S2). Binding is performed for each segment so that the strands are not loosened when the conductor is cut (step S3). The conductor is cut at a predetermined position for each segment (step S4). It is confirmed whether each segment is cut at a predetermined position (step S5). Next, each segment conductor is opened to the extent that sleeve compression work for each segment is possible (step S6). Each segment conductor end to be connected is lightly compressed (step S7), and as shown in FIG. 1B, each segment conductor end is inserted from both sides of the quasi-same diameter sleeve and compressed (step S8). The segment conductor 11 is returned to a predetermined position, and the circumference of the divided conductor is bound and shaped into a circle (step S9).

The sleeve compression connection position for each segment is
Similar to the conventional welding connection for each segment,
In order to secure the tensile strength and flexibility as much as possible, and to prevent the diameter expansion of the conductor, the arrangement is made as shown in Fig. 1 (c).

[0020]

The method of compression-connecting the divided conductors of the present invention for each segment by using the quasi-same diameter sleeve can shorten the connection time. Specifically, in the case of the present invention, it takes about 1 to 3 hours in comparison with the conventional welding connection which requires 20 to 30 hours or more.

Further, the conductor resistance can be reduced as compared with the welding connection.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state of quasi-same diameter sleeve connection for each power cable split conductor segment of the present invention,
(A) shows how the conductors are finished and where the segment is cut is marked, (b) shows that both segments are inserted in the quasi-same diameter sleeve, and (c) shows the quasi-identical connection of each segment. The location of the radial sleeve is shown.

FIG. 2 is a cross-sectional view of an example of a divided conductor according to the present invention.

FIG. 3 is a flowchart showing a divided conductor connecting step of the present invention.

[Explanation of symbols]

 1a, 1b Submarine cable 10 Divided conductor 11 Segment of divided conductor 12 Insulator of submarine cable 13 Segment cut position mark 14 Quasi-same diameter sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Fujii 42-1 Shintomi-cho, Futtsu-shi, Chiba Fujikura Co., Ltd. Futtsu factory (72) Inventor Katsuya Yamagami 42-1 Shintomi-cho, Futtsu-shi, Chiba Fujikura, Ltd. Futtsu Factory (72) Inventor Katsunao Shinoda 42-1 Shintomicho, Futtsu City, Chiba Fujikura Ltd. Futtsu Factory

Claims (1)

[Claims] 1. When connecting a split conductor of a power cable formed by twisting a plurality of segments obtained by compression-molding a stranded wire, the split conductor is exposed from a cable end, and a connecting portion between segments of the same twist phase is split. A method of connecting a power cable divided conductor, characterized in that each segment is cut at a position where it does not overlap in the conductor length direction, and a quasi-same diameter sleeve is inserted into the cut end of each segment for compression connection.