JPS5933767A - Power cable conductor 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 a power cable conductor connection section.

In recent years, power transmission networks have been expanded as electricity demand increases, but land shortages in large cities and soaring land prices have made it extremely difficult to install manholes and other equipment for underground power cable connections at appropriate locations. As a result, it has become necessary to provide a connection part inside the tunnel instead of the manhole part. In this connection within the tunnel, there is a space for sufficient offset such as a manhole section (<K<, -), and the arrangement of the connection section is also subject to strict conditions such as the space within the trough (K).As such, the t3 space is limited. When connecting cable conductors in a conductor sleeve, a major problem is how to absorb the extension that inevitably occurs when compressing and connecting cable conductors with conductor sleeves. A large number of workers were stationed at the couple part of the joint, and each time the expansion of the joint was released by the snake of the turret, the compression connection work was extremely difficult and time-consuming.

Even when the cable is not installed in a tunnel as described above, when the conductor sleeve of a high-voltage, large-sized conductor cable is compressed and connected, there is a thick 4R extension, and it is difficult to absorb this extension. This extension has been a troublesome problem, especially in the case of POF cables with high-voltage hole-rise conductors.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to prevent the cable conductor from elongating in the conductor sleeve during compression connection.
It is an object of the present invention to provide a novel conductor connection part that can be absorbed by the sleeve itself and can eliminate extension toward the cable side. .

In other words, the gist of the present invention is to divide the conductor sleeve into left and right parts,
The left and right conductor sleeves can be compressed separately, and a turnbuckle sleeve is used to connect the left and right conductor sleeves that have been compressed and connected separately.

An embodiment of the connecting portion of the present invention will be further described with reference to the accompanying drawings.

The conductor sleeve used in the present invention consists of three parts: a turnbuckle sleeve 1 and a compression sleeve 2.2 divided into left and right parts.

Note that 3 is a reinforcing steel pipe, which is unnecessary except for cables with a hollow structure in the center of the conductor, such as a single I*'or cable.

Reference numeral 6.7 is a threaded portion provided on each of the compression sleeves 2, and is screwed into a thread cut on the inner surface of the turnbuckle sleeve 1.

The conductor connection work using this conductor sleeve is as shown in FIG. 1 (11). First, each of the conductors 4 to be connected is covered with a compression sleeve 2, and then the left and right sides are compressed and connected to separate flA+. .

In this case, the threaded portion 6.7 (Jl) of each compression sleeve 2 at the end opposite to the cable conductor 4 is free and is therefore not subject to compression.
, Extension 1] [There is some extension on one end of the muff, but no extension occurs on the cable conductor 4 side.

Elongation due to compression (as shown in Fig. 2, it can be predicted in advance through lifting tests, etc.) that when the compression of the compression sleeves 2 on both sides is completed, the tips of the sleeves on both sides will slightly elongate at the center of the joint. It is necessary to make a II Jl# connection by adjusting J and uni facing each other with a gap between them.

Figure 2 shows the state of compression sleeve 2 after compression connection is completed at 7T.
Therefore, pull back the p1 reel 5 slightly and apply the turnbuckle sleeves 1 to the threaded parts 6.7 of the compression sleeves on both sides, and insert the cable back into the center of the connection. While rotating the turnbuckle sleeve 1, screw the compression sleeves 2 on both sides together.

Furthermore, in order to complete the electrical connection between the turnbuckle sleeve 1 and the compression sleeve 3, the turnbuckle sleeve 2 may be slightly compressed.

Since this compression is a very light compression, there is almost no elongation during this compression.

With the conductor sleeve structure and working method described above, it is possible to practically prevent the sleeve from elongating during compression connection.

In the above description, one embodiment of a single-core OF cable has been shown, but the present invention is not limited to this and can be applied to all types of conductor connections.

The present invention thus constructed provides the following advantages.

1. When constructing a trough inside a tunnel, the snake is removed after each compression to absorb the elongation during compression, which eliminates the extremely difficult work of absorbing this elongation, improving work efficiency and reducing man-hours. The reduction effect is significant.

2. When applied to cables with large conductors, there is no elongation when compressed, so there is no need to take elongation into account and insulation design, and work efficiency is significantly improved.

3 Non-A"7 t:' 1 One-way connection or pipe type kerosene pull J, Unaha: I!i II,'l If there is no stretch absorber 3, use the conductor sleeve of the present invention on the stand. As a result, workability is significantly improved.[2] With the addition of white clay, the provision of insulation structure increases and performance is improved.1

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of each part in an embodiment when the conductor sleeve of the present invention is applied to a center-of-gravity OF cable;
The figure is a cross-sectional view showing the state in which the cable conductor compression portion of the conductor sleeve of the present invention is compressed and connected, and Figure 3 is a cross-sectional view showing the cable conductor shown in Figure 2 in which both side conductors are connected with a turnbuckle sleeve after the cable conductor is compressed and connected. FIG. 3 is a cross-sectional view showing a completed state of connection through a conductor sleeve. 1: Turnbuckle sleeve, 2: Compression sleeve, 3:
Reinforced steel pipe, /1: Cable conductor, 5: Cable insulator, 6: Threaded part

Claims (1)

[Claims] In a power cable conductor connection section formed by connecting the conductors of a power cable with a compression type conductor sleeve, the sleeve is divided into left and right halves and each has a conductor compression part and a threaded part, and each of the compression parts has a conductor compression part and a screw part. A power cable conductor connection section characterized in that both conductors to be connected are connected by compression, and a turnbuckle sleeve is screwed and connected roughly between the threaded portions of the sleeves.