JPH0670440A - Cable terminal structure - Google Patents

Abstract

PURPOSE:To form an always uniform and high-quality cable terminal structure without requiring any skill. CONSTITUTION:A cylindrical insulating heat-shrinkable tubing 74, which has on the inner peripheral face a semiconductive layer 75 of position and length enabling the layer to be covered through the exposed semiconductor layer 23 and stress-cone semiconductive layer 43 of a cable and which can cover the stripped part of the cable, is fitted over the outside of the cable, in which the insulator of a terminal part is stripped stepwise according to predetermined dimensions and stress cone 41 is mounted, and the tubing 74 is heat-shrunk to perform covering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable termination structure in which a stress cone is attached to the terminal end of a high-voltage cable and is connected to a terminal or the like for insulation treatment.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional termination structure of a CV cable for 6.6 kV, for example. As shown in the figure, the cable sheath 21, the shielding copper tape 22, the cable semi-conductive layer 23, and the cable insulator 24 at the end of the cable are stripped to predetermined lengths. The ground wire 92 is attached and soldered to the shielding copper tape 22. A rubber stress cone 41 is fitted over the cable insulator 24. Conductor 25 and terminal 80
Connect to. Shield the semi-conductive fusion tape 63 with the copper tape 2
2 and the cable semi-conducting layer 23 and the stress cone semi-conducting layer 43 are wound back and forth once in a half width stack. Next, before and after the rubber stress cone 41, the self-bonding insulating tape 6
1 and 62 on the cable sheath 21 and the terminal 8 respectively
Similarly wrap so that it covers up to 0. Wrap a protective tape (not shown) on it. The phase identification tape 33 is wrapped around the rubber stress cone 41. The cable termination structure is formed by the above work.

As prior arts related to the present invention, Japanese Patent Laid-Open Nos. 62-48214 and 64-16213.
In connection with cables, in connection with cables, a semiconductive heat-shrinkable tube is externally fitted and heat-shrinked to form a semiconductive layer, and an insulating heat-shrinkable tube is externally fitted and heat-shrinked to form an insulating layer. A method of forming is shown.

[0004]

Although the prior art is as described above, in the cable termination structure shown in FIG. 5, the semiconductive fusion tape 63 and the self-fusion insulation tapes 61 and 62 are manually wound. Therefore, there is a problem that it requires skill, a lot of working time, and quality control so that an appropriate winding thickness can be obtained by applying an appropriate tension. In the means disclosed in the above publication, first, a semiconductive heat-shrinkable tube is externally fitted and heat-shrinked to form a semiconductive layer, and an insulating heat-shrinkable tube is externally fitted and heat-shrinked. Since the insulating layer is formed, there is a problem that it takes a lot of time and labor.

The present invention has been made to solve the above problems, and an object thereof is to obtain a high quality cable termination structure which can be formed easily in a short time without requiring skill. .

[0006]

SUMMARY OF THE INVENTION A cable terminating structure according to the present invention is a cable having a stress cone attached by stripping off the jacket of the terminating portion to a predetermined size, and the exposed semiconductive layer of the cable and the stress. A cylindrical insulating heat-shrinkable tube having a semi-conductive layer having a position and a length that can be covered through the semi-conductive layer of the cone on the inner peripheral surface and capable of covering the exfoliated portion of the cable is externally fitted and heat-shrinked. It has been coated.

[0007]

The insulating heat-shrinkable tube having a semi-conductive layer on the inner peripheral surface of the present invention, when the outer cover is stripped off and externally fitted to the cable having the stress cone attached thereto to cause heat shrinkage,
The semiconductive layer of the insulating heat-shrinkable tube is shrink-coated on the exposed semiconductive layer of the cable and the semiconductive layer of the stress cone to connect the two semiconductive layers. Further, the insulating heat-shrinkable tube covers the stripped portion of the cable for insulation protection.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 (B), 21 is a cable sheath that forms the jacket of this CV cable, and this cable includes a conductor 25, a cable insulator 24 covering the conductor 25, and
It is composed of a cable semi-conductive layer 23 wrapped around the outer periphery of the cable insulator 24, a shield copper tape 22 wrapped around the cable semi-conductive layer 23, and a cable sheath 21 covering the outside of the shield copper tape 22. ing. 41
Is a rubber stress cone having a stress cone semi-conductive layer 43. Reference numeral 80 denotes a terminal, and the terminal 80 is crimp-connected to the conductor 25 and connected to a power supply destination (not shown). Reference numeral 92 is a ground wire soldered to the shielding copper tape 22.

In FIG. 1, 74 is an insulating heat-shrinkable tube for covering and protecting the cable end portion. The insulating heat-shrinkable tube 74 is made of, for example, a material such as polyethylene, has a cylindrical shape as shown in FIG. 1A before being attached, and shrinks when heated to a certain temperature.
When stripped and externally fitted to a cable having a stress cone attached thereto and heat-shrinked, the stress cone and the cable are closely attached and covered, as shown in FIG. 1 (B). A semiconductive layer 75 is embedded in a part of the inner peripheral surface of the insulating heat-shrinkable tube 74. Since it is known how much the insulating heat-shrinkable tube 74 shrinks when it is heated and shrunk, the diameter, thickness, length and semi-conductivity of the insulating heat-shrinkable tube 74 before mounting as shown in FIG. When the length, thickness, and position of the layer 75 are heat-shrinked to form the shape shown in FIG. 1B, the semiconductive layer 75 and the insulating heat-shrinkable tube 74 respectively cover the illustrated ranges. Decide to do. 33
Is a tape for each phase color wrapped to identify the phase of the cable.

Next, a procedure for forming the cable terminating structure shown in FIG. 1B will be described. First, the CV cable is cut at a required length, the cable sheath 21 is stripped from the cut end by a predetermined length, and the shielding copper tape 22 is exposed. The exposed shielding copper tape 22 is peeled off leaving a predetermined size, and the cable semiconductive layer 23 is exposed. The exposed cable semi-conductive layer 23 is stripped off leaving a predetermined size to expose the cable insulator 24. Next, as shown in the drawing, the ground wire 92 is attached, and the shielding copper tape 22 is wound and soldered. Further, as shown in the figure, the rubber stress cone 41 is inserted outside the cable insulator 24 and fixed at a predetermined position. Next, as shown in FIG. 1 (A), the insulating heat shrinkage is applied to the outside of the cable end portion in which the rubber stress cone 41 is inserted at a predetermined position on the outside of the cable insulator 24 after being stripped off as described above. Tube 7
4 is fitted outside. Next, the tip end is stripped off leaving the cable insulator 24 by a predetermined size to expose the conductor 25 by a predetermined size. The exposed conductor 25 is inserted into the compression connection portion of the terminal 80, and the compression connection portion of the terminal 80 is tightened with a predetermined tool to mechanically and electrically connect the conductor 25 and the terminal 80. The end of the cable insulation 24 is tapered.

Next, as shown in FIG. 1, the cable end is fitted to the outside including the rubber stress cone 41.
The left end of the insulating heat-shrinkable tube 74 as shown in (A) of the figure is held according to the mark previously attached to the cable sheath 21, and heat is applied to the insulating heat-shrinkable tube 74 to shrink it. If the insulating heat-shrinkable tube 74 is heated and shrunk sequentially from the left side of the drawing, it can be smoothly shrunk and brought into close contact with the outer surface of the cable. When the insulating heat-shrinkable tube 74 is shrunk so that it is in close contact with the outer surface of the cable terminating portion to cover it as shown in FIG. 1B, the left end of the insulating heat-shrinkable tube 74 in the figure is a cable. The sheath 21 is covered to cover the semi-conductive layer 75 through the shielding copper tape 22, the cable semi-conductive layer 23 and the stress cone semi-conductive layer 43, and the right end of the insulating heat-shrinkable tube 74 is covered to the terminal 80. To do so. Therefore, the rubber stress cone 41 is fitted in a predetermined position, and as described above, the length of the insulating heat-shrinkable tube 74 and the position and the length of the semiconductive layer 75 are set in consideration of the shrinkage amount which is known in advance. Is set, and heat shrinks according to the mark attached to the cable sheath 21. After the insulating heat-shrinkable tube 74 is shrink-bonded to the outer surface of the cable terminating portion as shown in FIG. 1B, the phase identification tape 33 is wrapped as shown in the figure.

Next, the operation will be described. Figure 1 (A)
As shown in FIG. 1, when the semiconductive layer 75 attached to a part of the inner peripheral surface of the cylindrical insulating heat-shrinkable tube 74 is heated and shrunk, as shown in FIG. Since the semiconducting layer 23 and the stress cone semiconducting layer 43 are adhered and covered, the semiconducting layers are connected to each other and the electrical stress in a state where a high voltage of 6.6 kV is applied is relieved. To do. The insulating heat-shrinkable tube 74 is completely adhered to and covers the crimping portion of the terminal 80 including the entire portion of the cable sheath 21 stripped from the step, the outer surface of the semiconductive layer 75 and the outer surface of the rubber stress cone 41. Therefore, it protects this coating area and fulfills the function of insulation when other objects come into contact with it.

The work process for covering the stepped portion of the cable having the rubber stress cone 41 with the insulating heat-shrinkable tube 74 having the semiconductive layer 75 on the inner peripheral surface is shown in FIG. 1 (A). An insulating heat-shrinkable tube 74 having a cylindrical semi-conductive layer 75 whose inner diameter is about the outer diameter of the rubber stress cone 41 is inserted so as to be fitted onto the stepped portion of the cable on which the rubber stress cone 41 is mounted. ,
The insulating heat-shrinkable tube 74 is held according to the mark attached to the cable sheath 21, and the insulating heat-shrinkable tube 74 is heated and shrunk in order from the left side of the drawing, as shown in FIG.
As shown in FIG. 7, since the insulating heat-shrinkable tube 74 having the semiconductive layer 75 may be adhered to the outer surface of the cable and the rubber stress cone 41, this work is easy and requires no skill or the like. The conductive layer 75 and the insulating heat-shrinkable tube 74 adhere to the stepped portion of the cable and the rubber stress cone 41 with a uniform pressure, and the displacement of the rubber stress cone 41 is also prevented, so that the quality of the finished product is always good and uniform. Is obtained.

FIG. 2 shows an embodiment of a three-core cable. In FIG. 2, 50 is a trifurcated branch pipe. Also in this case, as in the description with reference to FIG. 1, each core wire is stripped off and the rubber stress cone 41 is attached, and as shown in FIG. 1A, a semiconductive layer 75 is partially provided on the inner peripheral surface. A cylindrical insulating heat-shrinkable tube 74 is externally fitted and inserted, and the left end of the insulating heat-shrinkable tube 74 in the figure is aligned with the mark 53 attached to each branch tip of the three-pronged branch pipe 50, and heated. Shrink and coat. In the case of the three-core cable shown in FIG. 2, each core wire is treated and the insulating heat-shrinkable tube 74 is coated so as to cover each branch end of the three-branch branch pipe 50. A self-fusing insulating tape 95 is wound around the cable sheath 21 to close and protect the gap between the trifurcated branch pipe 50 and the cable sheath 21.

FIG. 3 shows an embodiment in which the cable termination connection is long. If the insulating heat-shrinkable tube 74 having the semiconductive layer 75 partially on the inner peripheral surface does not reach the terminal 80 because the cable terminating end is long, a cylindrical insulating heatshrinkable tube not having the semiconductive layer 75 is further provided. 76
The terminal 80 is externally fitted over the terminal 80 and heat-shrinked to cover the terminal 80. In the figure, the self-bonding insulating tapes 68, 69 are wound under the insulating heat-shrinkable tubes 74, 76, but the self-bonding insulating tapes 68, 69 are not always necessary.

FIG. 4 shows still another embodiment. In this embodiment, the heat-shrinkable tube is divided into the front and rear of the rubber stress cone 41, and the rear part of the rubber stress cone 41 is covered with an insulating heat-shrinkable tube 74 having a semiconductive layer 75 on the inner peripheral surface thereof. The tip portion of is covered with an insulating heat-shrinkable tube 76. The insulating heat-shrinkable tube 74 mounted on the rear portion of the rubber stress cone 41 has a diameter, a thickness, and a length, a position, a thickness, and a length of the semiconductive layer 75 of the insulating heat-shrinkable tube 74 for each cable type. What is necessary is just to prepare those having a predetermined size for each type. Since the insulating heat-shrinkable tube 76 attached to the tip of the rubber stress cone 41 does not have the semi-conductive layer 75, long ones having various diameters are prepared, and those having an appropriate diameter are required. It can be cut into pieces and used.

In the above embodiment, instead of attaching the phase identification tape 33, the phase of the cable may be identified by using, for example, a color-coded insulating heat-shrinkable tube 74. Also, the terminal 80 and the conductor 2
Even when the connection structure with the cable 5, the cable covering structure, and the like are different from those shown in the drawing, the same effects can be obtained by applying the same.

[0018]

As described above, according to the present invention, the insulating heat-shrinkable tube partially having the semiconductive layer on the inner peripheral surface is externally fitted and heat-shrinked to cover the tube. There is an effect that a processing result of uniform and good finish quality can be obtained easily and easily.

[Brief description of drawings]

1A and 1B show a cable termination structure according to a first embodiment of the present invention, wherein FIG. 1A is a side sectional view before mounting an insulating heat-shrinkable tube, and FIG. 1B is a side sectional view after mounting.

FIG. 2 is a side sectional view of a cable termination structure according to a second embodiment of the present invention.

FIG. 3 is a side sectional view of a cable termination structure according to a third embodiment of the present invention.

FIG. 4 is a side sectional view of a cable termination structure according to a fourth embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional cable termination structure.

[Explanation of symbols]

 21: Cable sheath, 22: Shielding copper tape, 23: Cable semi-conductive layer, 24: Cable insulator, 25: Conductor, 41: Rubber stress cone, 43: Stress cone semi-conductive layer, 74: Insulating heat-shrinkable tube, 75: Semiconductive layer, 76: Insulating heat-shrinkable tube, 80: Terminal.

Claims (1)

[Claims] 1. A position and a length at which a cable having a stress cone attached by stripping off a jacket of a terminal end portion with a predetermined size can be covered through the exposed semiconductive layer of the cable and the semiconductive layer of the stress cone. 2. A cable terminating structure characterized in that a cylindrical insulating heat-shrinkable tube having a semiconductive layer on the inner peripheral surface thereof and capable of covering the exfoliated portion of the cable is externally fitted and heat-shrinked.