JPS6155232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting conductors of power cables, and more particularly to a method for connecting conductors of the same diameter using a sleeve.

Background and Purpose The same-diameter connection methods conventionally used for submarine cables, etc. are mainly based on welding, such as 1. Welding each strand of the cable conductor one by one, and 2. Welding each layer. .

However, connections that are mainly made by welding have the following disadvantages: 1. Welding takes a long time, so cooling is required to prevent sparks from causing a fire and the heat of welding to prevent deterioration of the insulation. 2. If the cable is not cooled, the length of the cable insulation to be stripped will be longer.

Connections using sleeves, which are commonly used in underground cables, do not have the above disadvantages.

However, the outer diameter of the connection portion is larger than that of a connection of the same diameter.

The present invention provides a method that utilizes the advantages of sleeves and also allows cable conductors to be connected with the same diameter.

Example 1 For unsplit circular stranded conductors.

First, strip off the cable insulator 10 (first
figure). Its length should be shorter than that of a conventional welded connection and similar to that of a conventional sleeved connection.

Next, the outermost layer of strands of cable conductor 12 is cut out (FIG. 2). If the conductor 12 is very large, two or more layers of strands are cut. The length A to be cut is half the length D of the sleeve 20, which will be described later (see FIG. 3). The thus treated portion 122 has a smaller diameter B than the untreated portion 120. Also, treat the conductor of the other cable in the same way. Then, the treated narrow diameter portions 122 of both cable conductors are attached to the sleeve 20.
(Fig. 3) and compress and connect in the same way as before. Note that the sleeve 20 used has an outer diameter approximately equal to the unprocessed portion 120 of the cable conductor 12 after compression. In this case, as an example, an elliptical sleeve whose short diameter is approximately equal to the outer diameter of the unprocessed portion 120 is used, as shown in FIG. 4.

Operation After compression, the sleeve 20 has approximately the same diameter as the cable conductor 12, as described above. A connection with the same diameter can be obtained without welding.

Example 2 In the case of a stranded conductor divided into four parts.

After stripping off the cable insulator 10 as shown in FIG. 5, the outer wire of each segment 14 of the cable conductor 12 is cut off as shown in FIG. 6. The length A to be cut is the same as above.
Then, a cross-shaped gap 16 is created between the segments 14.

On the other hand, the spacer 1 inserted into the above gap 16
Prepare 8. For example, as shown in the lower right side of FIG. 6, it is an elongated cross-shaped piece of metal whose cross section is equal to the cross section of the gap 16. Its length C is twice the said A and equal to the length D of the sleeve 20. Further, its material is also the same as that of the sleeve 20.
Further, if necessary, a large number of grooves 19 are provided on the surface thereof in a direction perpendicular to the length direction.

Then, insert the spacer 18 into the gap 16 of one cable conductor 12 (only half the length), cover it with the sleeve 20, and insert the similarly treated part 122 of the other cable conductor 12 from the opposite side (the seventh , Fig. 8), compression connection.

Operation Mechanically, the spacer 18 and the sleeve 20 clamp the conductor strands of the segment 14 to resist tensile forces. Also, the cable conductor is inserted into the groove 19 of the spacer 18, further increasing the opposing force.

Also, electrically, the current flows through one segment 1
4, it flows into both the spacer 18 and the sleeve 20, and again into the mating segment 14.

In addition, "FIG. 9" is a model diagram of the cross section at - in FIG. 8 after compression. When the central part of the sleeve 20 is particularly strongly compressed in this way, the spacer 1
8 is also thinner at the center than at both ends. This spacer 1
8 is inserted through the cable conductor 12 in both cases, so it is further prevented from coming out.

Other Examples (1) For reinforcement, the sleeve 20 and the cable conductor 12 are brazed at both ends of the sleeve 20 with silver solder or the like (not shown).

(2) The shape of the spacer 18 may be L-shaped or other, with a gap of 1
It is arbitrary as long as it blocks 6. Gap 1
If 6 remains, the sleeve 20 will not be able to be compressed.

Effects of the Invention A spacer capable of reducing the outer diameter of each segment by removing the outer layer wire at the connecting end of each segment, and closing the gap between the segments, and the length of the spacer is equal to that of the sleeve. An equal piece of material is prepared and inserted through both conductors to be connected to close the gap, and then the sleeve is used for compression connection, so that the spacer, together with the sleeve, absorbs the tensile force applied to the connection part. can be countered.

If the spacer is made of a good electrical conductor, the current will be
Through that section, flow can flow from one cable to the other.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are explanatory diagrams sequentially showing the steps of the first invention of the present application, and FIG. 4 is the -
FIG. Figure 5, Figure 6, Figure 7
The figures are explanatory diagrams sequentially showing the steps of the second invention, FIG. 8 is a cross-sectional view of - in FIG. 7, and FIG. 9 is a sleeve 20.
FIG. 9 is an explanatory diagram of the cross section indicated by - in FIG. 8 in the case where the central portion of is strongly compressed. 12...Cable conductor, 14...Segment,
16...Gap, 18...Spacer, 20...Sleeve.

Claims (1)

[Claims] 1. In the case of compressively connecting split conductors of cables using sleeves, the step of reducing the outer diameter of each segment by removing the outer layer strands at the connection end of each segment, and the step of reducing the outer diameter of each segment. A step of preparing a spacer that can close the gap that is formed and whose length is equal to the sleeve, and inserting it through both conductors to be connected to close the gap; The stranded wires with reduced outer diameters are arranged opposite each other, and a connecting sleeve corresponding to the reduced thickness and reduced outer diameter is crimped to the removed portion of the outer layer strand,
A method for connecting conductors, comprising the steps of: connecting divided conductors of a cable to each other. 2. The conductor connection method according to claim 1, characterized in that the center portion of the conductor connection sleeve is particularly strongly compressed. 3. The conductor connection method according to claim 1, characterized in that a large number of grooves are provided in the spacer surface in a direction perpendicular to the length direction.