JPH0133035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for connecting split conductors of a submarine cable.

[Prior Art] Split conductor connections of submarine cables are made by exposing split conductors 11, 11 to a required length from the terminals of each cable to be connected, cutting the conductor terminals into tapered shapes, and butting them together, as shown in the fourth diagram. Either the ends of these butted conductors are welded together at the welding part 13 to connect them, or the ends 12 of the divided conductors of the same twist phase to be connected are connected by protruding them on the upper surface of the cable conductor, respectively, as shown in Figure 5. They were connected at a joint weld 13.

If the split conductors are welded together as described above, the effect of forming the cable conductor into split conductors will be lost, and the AC resistance value of the connection will increase due to skin action, resulting in local heat generation and deterioration. In addition, in a method in which all butt joints of the same twist phase are butt-connected on the top surface of the cable conductor, each divided conductor 11, 11 is exposed for a considerable length from the cable terminal, cut to match the re-twist pitch, and butt-welded. Therefore, the conductor connection length P
is the twisted pitch length of the divided conductor (1000 to 2000
mm), which has the disadvantage of making the connection part longer.

In addition, in order to reduce the thickness of the connection sleeve, the abutting joints of the split conductors are arranged so that they are not in the same cross section, and the split conductor cable connections are made by cutting the end faces of the conductors at right angles, abutting them, and connecting them with a compression sleeve. Kimiaki Sane
It is known from Japanese Patent No. 53-18551, and the terminals of each divided conductor are penciled and butted, and the valleys are filled with silver solder and welded all at once to prevent the diameter of the connection part from increasing and to prevent the loss of flexibility. A connection portion which is prevented from bending is known from Japanese Utility Model Application Publication No. 49-102293.

[Problems to be Solved by the Invention] The connection part connected by a compression sleeve as in the above-mentioned publication has a problem in that the diameter of the conductor connection part is larger than the diameter of the cable conductor. If the divided conductor terminals are formed into pencil shapes and butted together, even if the butt valleys are filled with silver solder, etc., the silver solder, etc. will melt down, making welding difficult, and the melted down silver solder, etc. There was a problem in that the material adhered to the butt joint located below, making it impossible to form a good joint.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for connecting divided conductors of submarine cables, which does not cause the solder to melt as described above, facilitates welding connections, and forms good connections. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the submarine cable split conductor connection method of the present invention exposes the split conductors constituting the cable conductor from the submarine cable connection terminal, and The butt portions of each divided conductor terminal are distributed in the longitudinal direction of the cable so as not to be located on the same circumferential line of the cable conductor,
The divided conductor terminals with the same twist phase of each divided conductor terminal are butted against each other, and the butted end faces of all opposing divided conductor terminals are formed into tapered end faces that open upward in a V-shape from the bottom surface to the top surface of the divided conductor. After cutting, the abutting portions of the ends of each divided conductor are welded and connected in the order from the abutting portion located on the lower side of the cable conductor to the abutting portion located on the upper side.

[Function] By butting and connecting the split conductor terminals with the same twist phase, the twist pitches at the connection parts are matched, and the butt parts of the split conductor terminals are not located on the same circumferential line of the cable conductor. By distributing the cable conductor, the length of the cable conductor connection portion does not need to be equal to the split conductor twisting pitch P shown in FIG. 5, and is shorter than the conventional connection portion.

In addition, by forming the butt end faces of each divided conductor terminal into a tapered end face that opens upward in a V-shape, it is possible to prevent the silver solder from burning through when the butt part is filled with silver solder etc. and welded and connected. , thus a good connection is formed.

In addition, when welding connections, by welding in the order from the butt part located on the lower side of the cable conductor to the butt part located on the upper side, the conductor above the butt part of the conductor that is currently being welded can be welded. Since the butt portion can be left open to the left and right, welding work can be performed easily and quickly without being obstructed by the upper conductor terminal.

[Examples] Examples of the present invention will be described below with reference to the drawings. Fig. 1 shows a cross section of a submarine cable split conductor connection part connected by the method of the present invention, and Fig. 2 shows a cross section of a cable conductor made of split conductors, where 1 shows the connection of the submarine cable to be connected. Terminal section, 3
2 is a hollow oil passage formed in the center of the cable conductor 10; 6 is an insulation coating on the cable conductor; 7 is a cable lead sheath; and 8 is a lead sheath on the lead sheath 7. It is a PE coating layer.

Required lengths of the cable conductors 10, 10 are exposed from both connection terminals of the submarine cables 1, 1 to be connected, respectively, and both of the exposed cable conductors 1
The terminal portions of each of the divided conductors 3 and 3 of 0 and 10 are cut to a predetermined length to form butt ends of the divided conductors 3 and 3 and butted against each other.

The abutting ends of the divided conductors 3, 3 are arranged so that the butt ends of the divided conductors are not located on the same circumferential line of the cable conductor 10. The protruding length of the terminals of each divided conductor 3, 3 is set and cut so that the positions of the abutting portions of the terminals are dispersed in the longitudinal direction of the cable 10, and the conductor terminals are cut at predetermined butting positions.

Further, when the divided conductor terminals are butted together as described above, the butted terminals of the divided conductors 3, 3 of the two cable conductors 10, 10 to be connected abut the divided conductor terminals of the same twist phase.

The opposing butt end faces of the above-mentioned both split conductor terminals are all butt end faces 4, which are tapered end faces that open upward in a V-shape from the bottom surface to the top surface of the split conductor, as shown in FIG. Cut it to look like this.

That is, A in FIG. 3 shows the abutting portion of the terminal of the divided conductor located above the cable conductor 10 among the divided conductors 3 constituting the cable conductor 10,
B shows the butt part of the terminal of the split conductor located on the lower side of the cable conductor 10, C shows the butt part of the end of the cable conductor 1
This figure shows the abutting parts of the terminals of the split conductors located on the side of cable conductor 10 (on the right side in the figure), but as shown in this figure, all the parts on the upper and lower sides of the cable conductor 10 and the intermediate sides The butt end surfaces of the conductor terminals of the split conductor are both turned into V from the bottom surface to the top surface.
Cut into a tapered end face that opens upward in the shape of a letter.

The butt ends of the conductor terminals are processed into V-shaped tapered end faces as described above, and the butt portions of each divided conductor terminal are welded using silver solder or copper solder to form a V-shaped recess between the butt end faces of the conductor terminals. The area is filled with this silver solder, etc., and the surface is finished and smoothed to form the connection part of the divided conductor terminal.

The butt portions of the divided conductor terminals are welded and connected in order from the abutment portion located on the lower side of the cable conductor to the abutment portion located on the upper side. That is, the cable conductor 10 shown in the second figure
The butt portions of the divided conductor 3a located below, the divided conductor 3b located on both sides, the divided conductor 3c located above the divided conductor 3c, and the divided conductor 3d located on the uppermost side are welded in this order. Split conductors 3a, 3 located below the cable conductor 10 in the figure
First weld the butt welded joint 5a of a, then weld the butt welded joints 5b of the divided conductors 3b, 3b located above it, and then weld the butt welded joints 5b of the divided conductors 3c, 3c located above it. Welding connection part 5
c, and finally, the butt weld connection portion 5d of the uppermost divided conductor 3d is welded.

By welding the cable conductor in this order from the bottom butt to the top, the conductor butt above the welded conductor butt can be opened to the left and right. Then, silver solder or the like can be filled in the V-shaped recess of the conductor end abutment part and welded, so the welding work can be easily performed.

As mentioned above, the insulation reinforcing layer 6', lead sleeve 7', and polyethylene mold layer 8' are provided on the connection part where the butt parts of the ends of each divided conductor are welded together to form the submarine cable divided conductor connection part. .

[Effects of the Invention] As described above, the present invention provides a V-shaped tapered end face when the split conductor terminals of the same twist phase are butted so that the butt portions of the split conductor terminals are not located on the same circumferential line of the cable conductor. The butted parts of each split conductor terminal are connected by welding from the bottom to the top of the cable conductor, which makes it possible to shorten the length of the cable conductor connection part compared to the conventional method. In addition, there is no burn-through of silver solder etc. during welding, and therefore it is possible to easily form a good connection.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a cable connection part according to an embodiment of the present invention, FIG. 2 is a sectional view of a cable conductor, FIG. 3 is a perspective view of a split conductor end abutting part, and FIGS. It is a figure showing a conventional example. 1: Submarine cable terminal, 3: Split conductor, 4: V
Shape taper end face butt terminal parts, 5a to 5d:
Welding connection, 10: cable conductor.

Claims (1)

[Claims] 1. Expose the divided conductors constituting the cable conductor from the terminals of the submarine cable to be connected, and distribute the positions of the butt parts of the connecting terminals of each divided conductor so that they are not located on the same circumference of the cable conductor, so that the same twist phase is achieved. The divided conductor terminals are butted together, and the butted end surfaces of all opposing divided conductor terminals are cut into tapered end surfaces that open upward in a V-shape from the bottom surface to the top surface of the divided conductor, thereby forming each of the aforementioned divided conductor terminals. A method for connecting divided conductors of submarine cables, characterized in that the butt portions of the cable conductor are welded in order from the butt portion located on the lower side to the butt portion located on the upper side of the cable conductor.