JPH03112015A - multicore power cable - 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 (Field of Industrial Application) The present invention relates to a multicore power cable mainly used for submarine installation.

(Prior art) Conventional multi-core submarine power cables, for example, in the case of oil-immersed cables such as OF cables, are twisted and assembled into a single piece at the cable core stage, and are then covered with a metal sheath such as a lead sheath. After applying insulation and impregnating the inside with insulating oil, a seat, a steel wire sheath, and a serving layer were applied on top of the metal sheath to form a submarine cable. In the case of rubber or plastic cables, they are twisted together with inclusions at the cable core stage and integrated into a circular shape, and a metal sheath is provided on the outside or as necessary, and a steel wire sheath is applied in the same way as above. It formed an undersea cable.

(Problem to be Solved) In any case, the conventional multi-core submarine power cables described above include a process of twisting and gathering at the cable core stage. A gathering machine is used for this twisting and gathering. As long as a bundler is used, the single length of the cable core after twisting is limited by the supply bobbin or winding bobbin of the bundler, and becomes very short.

Therefore, in the case of a long cable, there will be many connections.

Another means of twisting is the 321 method. In contrast to conventional twisting, which involves twisting in the same direction, this method
In this method, the wires are twisted in opposite directions alternately at every twist pitch. This SZ twisting allows for longer lengths compared to conventional twisting methods, but it requires a great deal of effort to SZ twist a large diameter and hard core like a power cable core. There is a disadvantage that the processing time is longer than that of conventional twisting. Also, a high degree of skill is required to fix the Sz twisted core with tape or the like so that the twist does not untwist in subsequent steps.

(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides a multi-core cable that can be made longer.The first feature thereof is as follows:
A plurality of power cable cores are gathered together in parallel without twisting over the entire length through a spacer placed in the center, and an inclusion is inserted in the gap between the gathering of the cable cores, and the cables are integrated into a circular shape using a binding material. It is a multi-core capacitor consisting of.

A second feature of the present invention is that a plurality of power cable cores are not twisted together (they are assembled in parallel), and spacers are interposed at regular intervals in the center of the cable cores to separate the spacer portions from the spacer portions. A multi-core capeple is formed by forming a spacer part, arranging an inclusion on the outside of the non-spacer part, and integrating the entire length into a circular shape using a binding material.

FIG. 1 is a cross-sectional view of a specific example of a multi-core (three-core) power cable according to the first feature of the present invention, and FIG. 2 is a side view showing the longitudinal state of the cable core of the multi-core cable. It is.

In the drawing, (CI HO2) (C3) is a three-core power cable core. These power cable cores (C8)
(02) (C3) Cable cores (CI) (C2) so that they are parallel to each other over the entire length without twisting around the cushioning spacer (1) with the three cores (C3) placed in the center. (C3) are gathered together so that they do not touch each other. And cable core (C
I) An inclusion (2) is interposed between the alignment of (C2) and (C3), and bound from the outside with a bind tape (3) or the like to form a circular shape.

Of course, when used for submarine-laid power cables, there is a seat,
It will be made into a multi-core submarine power cable by applying iron wire sheathing, serving layer, etc.

FIG. 3 is a cross-sectional view of a non-spacer portion of a specific example of a multi-core (three-core) power cable according to the second feature of the present invention, and FIG. 4 is a longitudinal state of the cable core of the multi-core cable. FIG.

As above, three-core power cable core (CI) (C2) (
C3) is not twisted but is assembled in parallel over the entire length. And cable core (C
I) Spacers (1) of a certain length are interposed at certain intervals in the center of the arrangement of (C2) and (C3), thereby forming a spacer part and a non-spacer part in the length direction. Ru. In the spacer part, as shown in FIGS. 1 and 2, the cable core (at) (C2) (C3
) are located without touching each other, and when forming the cable, the cable cores (CI) (C2) (C3)
An inclusion (2) is interposed in the gap between the two. In addition, in the non-spacer part, as shown in FIG. 3, the cable cores (CI) (02) (C3) are preferably in contact with each other so that they are sufficiently close to the center compared to the spacer part. In this way, the inclusions (2') are also placed in the assembly gap and on the outside, and are bound over the entire length with a bind tape (3) or the like to integrate them into a circular shape. Of course, when used as a submarine-laid power cable, a multi-core submarine power cable is formed by applying a steel wire exterior or the like as described above.

(Function) To get back to the essence of the necessity of twisting in the case of multi-core cables: ■ Finishing the three cores into a circular shape.

■When winding in the subsequent process, only one core is pulled or floated, and the three-core metal body is loosened and tightened evenly to maintain a circular assembled state.

■Electrically, the lines of electromagnetic force in phase A, phase B, and phase C are averaged and become zero.

However, there is relatively little need for ■. Therefore, the above ■
You only need to solve ■.

First, in order to make the three cores circular, it is not necessarily necessary to twist them in one direction as in the conventional case or to twist them in Sz. It is possible to maintain a circular shape by assembling three cores in parallel using a fixed guide, battens, dies, etc., interposing an inclusion in the gap between the cable cores, and binding with bind tape or the like.

Moreover, the main purpose of the present invention is to prevent floating and tension during winding in this state from becoming excessively unbalanced between the three cores, and to prevent these unbalances from accumulating and increasing in the longitudinal direction of the cable. It is.

The multi-core power cable according to the first feature of the present invention has a spacer (1) having a cushioning effect interposed in the center of a set of three cable cores (CI) (C2) (03). (CI), (C2), and (C3) should not come into contact with each other. The cable core assembled in this way must be coiled in the next process. For example, in the case of a submarine cable, the three cores are assembled using dies, etc. in the iron wire sheathing process, the iron wire is sheathed in tandem and pulled out with caterpillars, then the coil is taken out at the yard, and then the coil is taken out on board the ship. Or - just take the coils on board.

When coiling, the three-core cable core is always twisted 360 degrees in one turn, so the three cable cores can move sufficiently through the spacer that has a cushioning effect, and the bow tension and compression are applied to a specific cable core. It is possible to remove the coil in a negative manner without applying any force. If the coil diameter is large enough (for example, 40 times or more the finished outer diameter of the cable), it is possible to have three cores in contact with each other, but it is possible to use a cushioning spacer as shown in Figure 1. It is preferable to have the coils interposed so that they do not come into contact with each other so that the coil can be twisted more smoothly by 380'.

The multi-core power cable according to the second feature of the present invention is capable of being coiled as well as being wound on a drum that can be bent in only one direction.

At the center of the three cable cores (c+) (C:2) (C3) assembled together, there are spacers 71 of a certain length at regular intervals →→, made of an elastic material such as hard rubber or epoxy resin, etc. A spacer portion and a non-spacer portion are formed in the length direction by interposing an inelastic body. The spacer part is the same as above, but the cable core (C□) (C
2) Place an inclusion on the outside of (C:3) so that it is as close to the center as possible, preferably in contact with it, and bound over its entire length with a bind tape or the like to integrate it into a circular shape. In submarine cables, a steel wire sheath is applied to the outside of the cable.

In such a cable, the cable core is sufficiently centered in the non-spacer portions that are present at regular intervals, but at its extreme, the cable core is in contact, so the cable core has slack in these portions.

When coiling the above cable, it is similar to the cable shown in FIG. Also, when drum-wound, the outer cable core is stretched into a bow with no slack, but the inner cable core becomes more slack, changing its shape until it reaches a harmonious 7-round shape depending on the bending radius. Therefore, the height of the spacer, the arrangement interval of the spacer, etc. may be determined according to the radius of the drum. At this time, it is preferable that the spacer is made of an elastic material, since this facilitates absorption of insufficient slack in the cable core due to deformation of the spacer itself.

(Effects of the Invention) According to the multi-core power cable of the present invention, it is sufficient to simply gather the cable cores together, so unlike conventional unidirectional twisting, it is not limited by the supply bobbin or winding bobbin of the gathering machine. It is possible to lengthen the length without any trouble. Further, unlike Sz twisting, a great deal of effort is not required for twisting, and processing is easy and productivity is improved.

Therefore, it is extremely effective when used in cables for coiling submarine cables. Also, when drum winding is required, a cable with the second characteristic can be used.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a specific example of a multi-core power cable according to the first feature of the present invention, and FIG. 2 is a side view showing the state of the cable core in the longitudinal direction of the multi-core power cable. It is. FIG. 3 is a cross-sectional view of a non-spacer portion of a specific example of a multi-core power cable according to the second feature of the present invention, and FIG. 4 is a side view showing the state of the cable core in the longitudinal direction of the multi-core power cable. It is. C1102, C3... Cable core, 1... Center spacer, 2.2'... Inclusion, 3... Bind tape.

Claims (2)

[Claims] (1) Multiple power cable cores are gathered together in parallel without twisting over the entire length through a spacer placed in the center, and an inclusion is inserted in the gap between the cable cores, and a binding material is used to form a circular shape. A multi-core power cable characterized by an integrated coil. (2) A plurality of power cable cores are assembled in parallel without twisting, spacers are interposed at regular intervals in the center of the assembly of cable cores to form a spacer part and a non-spacer part, and a non-spacer part is formed. A multi-core power cable characterized in that an inclusion is placed on the outside of the spacer portion, and the entire length is integrated into a circular shape using a binding material.