JPH06292315A - Connection of power cable conductor - Google Patents

Abstract

PURPOSE:To improve the efficiency of the connection work by enabling extension of a compression sleeve at the free end thereof during connection of the power cable conductor. CONSTITUTION:Cable conductors 4, 4' of power cable to be connected are inserted respectively at the base end side of the right and left compression sleeves 8, 9 having the threading portions 11, 12 at the external circumstances thereof for the compressed connection and these end portions are arranged to face with each other keeping therebetween a very short distance. Next, a connecting sleeve 13 having previously been threaded with the threading portion 12 on the one compressed sleeve 9 is then threaded to the other compressed sleeve 8 to couple the cable conductors 4, 4', a valley portion generated by movement of the connection sleeve is covered with a half-split collor 15 and the sleeve 14 for covering the valley portion which has been inserted at the external circumference thereof is moved for connection through compressed fixing. Moreover, for the connection of conductor of the single core OF cable, a reinforcing steel pipe for obtaining oil path is previously inserted into the center area of the right and left compressed sleeves.

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 cable conductors when forming a power cable connection.

[0002]

2. Description of the Related Art In recent years, the transmission network has been expanded with the increase in demand for electric power, but manholes for connecting power cables are installed at appropriate positions due to land shortages and rising land prices in large cities. Has become extremely difficult. For this reason, it is necessary to provide a cable connection part in the cave. In connection with the power cable in this cave, there is no space for sufficient offset like a manhole, and the arrangement of the connection part is a severe condition that it is installed in the trough. When connecting a power cable in such a limited space, a big problem is how to absorb the extension of the power cable that is inevitably generated.

Conventionally, in order to absorb the extension of the electric power cable, a large number of workers are arranged in the cable portions on both sides of the connection portion, and the extension of each compression is sequentially escaped by the snake of the electric power cable. Has been adopted. For this reason, the compression work is extremely complicated and requires a large number of workers and a lot of time. In addition, even when the connection is not in a cave, there is a large extension when the conductor sleeve of a high-voltage, large-sized conductor cable is compression-connected, and it is necessary to consider an offset length that can absorb the extension.

Further, there is a turnbuckle sleeve connection method shown in FIG. 4 which is proposed for the purpose of solving the above problems. That is, a pair having a turnbuckle sleeve 1 whose inner surface is threaded and threaded portions 6 and 7 which are threaded in opposite directions so as to advance toward the center of the turnbuckle sleeve 1 as the turnbuckle sleeve 1 rotates. Composed of compression sleeves 2, 2'of
After the ends of the cable conductors 4, 4'to be connected on the left and the right are respectively compression-connected to the proximal ends of the compression sleeves 2, 2 ', both compression sleeves 2, 2'and the turnbuckle sleeve 1 are brought to the positions shown in the drawing. And the threaded portion formed on the inner surface of the turnbuckle sleeve 1 and both compression sleeves 2,
Threaded parts 6, 7 provided on the outer circumference of the side to which 2'is connected
After engaging and connecting and, the turnbuckle sleeve 1 is rotated, and both compression sleeves 2 and 2'are joined by the turnbuckle sleeve 1.

However, the turnbuckle sleeve 1
When screwing in, it is necessary to leave a space for the length of the turnbuckle sleeve 1 once.
However, there is a problem that it is not a mechanism to absorb the complete extension. Further, the power cables 5 and 5'on both sides must be moved in the direction of the turnbuckle sleeve 1 in accordance with the rotation of the turnbuckle sleeve 1, which has a drawback that the work becomes complicated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and it is possible to handle the extension of the compression sleeve at its free end, and to spread the cable when connecting. It is an object of the present invention to provide a cable conductor connecting method that does not require.

[0007]

According to the method of connecting a power cable conductor of the present invention, the cable conductors of the power cable to be connected to the proximal ends of the left and right compression sleeves having threaded portions on their outer circumferences are respectively inserted and compression connected. Then, these tips are arranged so as to face each other with a slight distance, and the connection sleeve that was previously screwed onto the threaded portion on one compression sleeve is screwed onto the other compression sleeve side to join the cable conductor. Then, the valley portion generated by the movement of the connecting sleeve is covered with a half collar, and the valley embedding sleeve previously inserted on the outer periphery is moved to be compressed and fixed to be connected. To do. Further, in the conductor connection of the single-core OF cable, it is characterized in that reinforcing steel pipes for securing oil passages are inserted in advance in the central portions of the left and right compression sleeves, respectively.

[0008]

Since the extension of the compression sleeve can be treated at its free end and the power cable does not need to be spread when connecting the cable conductor, the work is extremely simple.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a single-core OF cable will be described with reference to the drawings. FIG. 1 shows that the left and right single-core OF cables 5, 5'are connected to the cable conductors 4, 4 ', the left and right compression sleeves 8, 9 and the threaded portion 12 provided on the circumference of the compression sleeve 9. Connection sleeve 13
FIG. 7 is a cross-sectional view of an upper half portion showing an initial arrangement state of a conductor connecting fitting including a valley filling sleeve 14 and the like. That is, only when connecting a cable having a hollow structure such as a single-core OF cable, the reinforcing steel pipes 3 and 3 ′ for securing the oil passage in the central portion of the cable conductors 4 and 4 ′ are connected to the respective cable conductors 4 and 4.
4'is inserted in the center of the end. Left and right compression sleeves 8,
9 is arranged so that the ends of the compression sleeves 8 and 9 face each other with a slight distance when the compression connection of the cable conductors 4 and 4'to be connected is completed. The connection sleeve 13 is pre-screwed, and the valley-filling sleeve 14 is inserted and arranged on the outer periphery of the connection sleeve 13.

First, the power cables 5 and 5 to which the compression connection portions on the base end side of the left and right compression sleeves 8 and 9 are respectively connected.
The cable conductors 4'and 4'are compression-connected to the stepped portions at the ends. Next, the left and right compression sleeves 8 and 9 are opposed to each other with a slight distance as shown in FIG. At this time,
Since the threaded portions 11 and 12 of the left and right compression sleeves 8 and 9 are free, extension due to compression when inserting and fixing the respective cable conductors 4 and 4'is only at the free ends of the compression sleeves 8 and 9. appear. Moreover, since the expansion dimension of the compression sleeves 8 and 9 due to compression can be known in advance by a factory test or the like, the distance between the compression sleeves 8 and 9 becomes a predetermined value after the left and right cable conductors 4 and 4'are compression-connected. So easy to arrange.

Subsequently, in FIG. 2, the connecting sleeve 13 pre-screwed into one compression sleeve 9 is rotated,
The pair of compression sleeves 8 are screwed into the compression sleeve 8 side,
9 are connected by this connecting sleeve 13. At this time, when the connecting sleeve 13 is completely screwed into the compression sleeve 8 side, the valley of the length obtained by adding the length of the threaded portion 11 of the compression sleeve 8 and the gap between the sleeve ends on both sides to the base end side of the compression sleeve 9. Part will be generated. Therefore, a half collar 15 is attached to this valley portion, and is pressed and fixed with a copper tape or the like, and further, the valley embedding sleeve 14 previously inserted on the outer circumference of the connection sleeve 13 is moved directly above this,
The valley-filling sleeve 14 is compressed and fixed. By setting the inner diameter of the valley-filling sleeve 14 after being compressed and fixed to be substantially equal to or slightly larger than the outer diameter dimension of the half collar 15, the extension of the valley-filling sleeve 14 due to the compression and fixing is reduced. It becomes an extension that completely fills the part, and it is possible to prevent the extension in the cable direction.

FIG. 3 is a cross-sectional view of the upper half of the cable connecting portion after the compression and fixing of the valley filling sleeve 14. After that, an insulating layer is formed on the outer periphery of the conductor connecting portion thus formed, and the cable connecting portion is completed.

[0013]

As described above, according to the power cable conductor connection method of the present invention, the extension at the time of compression connection of the cable conductors to be connected to the left and right to the pair of compression sleeves is processed by the free ends of the compression sleeves. Is possible
The workability of the conductor connection work of the power cable is significantly improved. Further, the work of pushing the cable apart for inserting the connection sleeve and pulling the cable with the progress of the connection process becomes unnecessary, which is particularly suitable for connecting a large-sized conductor cable.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an upper half portion for explaining an initial arrangement state of a connection cable and a connection member,

FIG. 2 is a cross-sectional view of an upper half portion when a conductor is joined by a connection sleeve,

FIG. 3 is a cross-sectional view of the upper half portion of the valley-filling sleeve for compression finishing,

FIG. 4 is a cross-sectional view of an upper half portion of a cable conductor connecting portion using a conventional turnbuckle sleeve.

[Explanation of symbols]

 1 Turnbuckle sleeve 2,2 ', 8,9 Compression sleeve 3,3' Reinforced steel pipe 4,4 'Cable conductor 5,5' Cable insulator 6,7,11,12 Thread processing part 13 Connection sleeve 14 For valley filling Sleeve 15 half color

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naohisa Numata 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture “Hitachi Cable Co., Ltd. Hidaka Plant” (72) Inventor Sumio Koibuchi Hitachi City, Hidaka, Ibaraki Prefecture 5-1-1 Hachi "Hitachi Cable Co., Ltd. Hidaka Factory" (72) Inventor Masayuki Kobayashi 5-1-1 Hidaka-cho, Hitachi City, Ibaraki "Hitachi Cable Co., Ltd. Hidaka Factory" (72) Inventor Kazuo Takahashi 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki "Hitachi Cable Co., Ltd. Hidaka Plant"

Claims (2)

[Claims] 1. A cable conductor is inserted into each of proximal ends of left and right compression sleeves having threaded portions on their outer circumferences for compression connection, and the tips of these compression sleeves are arranged so as to face each other. The connection sleeve that was previously screwed onto the threaded portion of the above is screwed into the other compression sleeve side to join the compression sleeves, and the valley formed by the movement of the connection sleeve is covered with a half-split collar. A method for connecting a power cable conductor, comprising moving a valley-filling sleeve that has been inserted in advance into the valley to fill the valley. 2. In the conductor connection of a single-core OF cable, reinforcing steel pipes for securing oil passages are inserted in the central portions of the left and right compression sleeves in advance, respectively. How to connect power cable conductors.