JPS5827734B2 - How to connect conductors of single-core OF cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting conductors, particularly for human-sized single-core OF cables.

Figure 1 shows a single-core OF cable (hereinafter simply referred to as a cable).

) shows the general structure of the conductor connection part.

In the figure, 1 and 1' are cable conductors, 2 and 2' are oil passages, 3 is a compression type conductor connection pipe, and 4 and 4' are reinforced steel pipes to prevent the oil passage from being crushed when the conductor connection pipe is compressed. It is.

As the voltage of cables becomes higher, the connecting portions thereof are gradually becoming larger, and in order to make the cables smaller, it is desirable to make the outer diameter of the conductor connecting portions as small as possible.

Reducing the outer diameter of the conductor connection part means that the cross-sectional area of the conductor connection pipe becomes smaller, and when a tensile strength test is conducted on the connection part with the structure shown in Figure 1, it is found that if the compression of the connection part is appropriate, , the rupture occurs at the center of the conductor connection tube, which has a small cross-sectional area.

Therefore, in order to increase the tensile strength even if the lf1 area of the conductor connecting pipe is small, the reinforcing steel pipes 4 and 4' shown in Fig. 1 are integrated as shown in Fig. 2, and the tensile load is also shared by the reinforcing steel pipe. That's fine.

To assemble the conductor connection part with the structure shown in Fig. 2, insert the conductor connection pipe 3 up to the end face of the conductor 1, and insert the reinforcing steel pipe 4 until its protrusion 4a touches one of the cable end faces. , the left and right cables are bent at an appropriate radius to widen the distance between the end faces of the conductors, and the reinforcing steel pipe 4 is straightened without inserting it into the other cable oil passage, and the conductor connecting pipe 2 is bent.
Move to the center of the connection part and perform compression connection work.

However, such a working method is possible when the conductor cross-sectional area of the cable is small and a certain degree of flexibility is required, but when the conductor cross-sectional area is thick, it is possible to
Above rri', the cable becomes almost like a rigid body,
The above operation becomes impossible.

The present invention has been made with attention to the above points, and provides a conductor connection method for a single-core OF cable in which a reinforcing steel pipe can be easily inserted between the oil passages of an inner conductor and conductor connection work can be performed efficiently. The purpose is to

The method according to the present invention will be described below with reference to the embodiments shown in FIGS. 3 and 4 (common parts with the above-mentioned conventional example are given the same reference numerals).

The present invention achieves the above object by using a reinforcing steel pipe as shown in FIG. 3.

That is, in FIG. 3, this reinforcing tube 5 has a small hole 6 that penetrates in the radial direction approximately at the center, and has an outer periphery 7 at both ends.
is approximately equal to the inner diameter of the conductor oil passage, and the outer circumference 8 of the intermediate portion has a slightly smaller diameter than the inner diameter of the conductor oil passage.

Further, the outer edges 7a and 7b of both ends are suitably prefaced so that it can be smoothly inserted into the cable oil passage.

When the reinforcing steel pipe 5 thus constructed is inserted into the conductor oil passage, as shown in FIG. It is inserted until it is completely buried inside.

At this time, both ends of the flexible edge 9 are exposed to the outside from the end tube of the cable conductor 1'.

Next, both cable conductors 1.about.1' are abutted against each other so that their axes coincide with each other, and by pulling both ends of the flexible edge 9, the reinforcing steel pipe 5 is moved until it is located at the junction of the side conductors.

When the small hole 6 of the reinforcing steel pipe 5 is located at the end face of the cable conductor 1', the flexible edge 9 is pulled out from the small hole 6, and the conductor connecting pipe 3, which had been previously fitted onto the other cable conductor 1-L, is removed. It is best to move it to the right in the figure and compress it at a predetermined position.

By making the outer periphery 7 of both ends of the reinforcing steel pipe 5 substantially equal to the inner diameter of the conductor oil passage, and the outer periphery 8 of the middle part thereof having a slightly smaller diameter, the contact area with the oil passage is small and smooth movement is possible.

By adopting the above method, when the reinforcing steel pipe 5 is placed across the cable conductors 1 and 1' to be connected, it is completely embedded in the oil passage of one cable conductor 1'. Therefore, there is no need for bending work to butt the two cable conductors together.

Particularly in the conductor connection work of a dog-sized cable with a conductor area of 1000 mm2 or more, the bending of the conductor, which requires considerable effort and time, can be omitted, so that the work can be streamlined to a large extent.

As described above, according to the method according to the present invention, the reinforcing steel pipe can be easily inserted between the oil passages of the side conductors, and the conductor connection work can be performed efficiently.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views showing the conductor connection portion of a conventional single-core OF cable, respectively, and FIG. 3 is a longitudinal cross-sectional view showing a reinforcing steel pipe used when carrying out the method of the present invention. Fourth
The figure is an explanatory diagram showing the implementation status of the method of the present invention. 1.1'...cable conductor, 2,2'...oil passage,
3... Conductor connection pipe, 4, 5... Reinforced steel pipe, 6...
Small hole, 9...flexible edge.

Claims (1)

[Claims] 1. Pairs of conductors of single-core OF cables to be connected are arranged facing each other, and a reinforcing steel pipe is inserted across between the oil passages of the inner conductors,
In a conductor connection method for a single-core OF cable, in which the inner conductor is connected by fitting a conductor connecting tube around the outer periphery of the joint end of the inner conductor and compressing the conductor connecting tube, the reinforcing steel tube is A small hole is provided approximately in the center of the reinforcing steel pipe, and with the flexible edge inserted through the small hole, the reinforcing steel pipe is inserted into the oil passage of one of the conductors, and both ends of the flexible tube are inserted into the oil passage of one of the conductors. After exposing and inserting the inner conductor, and then butting the inner conductor,
A single core characterized in that the reinforcing steel pipe is moved so as to straddle between the oil passages of the inner conductor by pulling both ends of the flexible edge, and then the conductor connecting pipe is placed in its position and compressed. How to connect conductors of OF cable. 2. The method for connecting conductors of a single-core OF cable according to claim 1, wherein a reinforcing steel pipe is used in which the outer periphery of both ends is approximately equal to the inner diameter of the cable oil passage, and the outer periphery of the middle part is slightly smaller in diameter than the inner diameter of the cable oil passage.