JP3401187B2 - Bypass cable - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a bypass cable used in an uninterruptible bypass construction method for overhead distribution lines, and more particularly to a bypass cable characterized by a shield layer connection structure at a terminal portion.

[0002]

2. Description of the Related Art A bypass cable is provided with a shield layer on an outer semiconductive layer from the viewpoint of security and cable performance. Usually this shielding layer has a diameter of 0.12 mm
It has a braided structure in which a thin copper wire (metal element wire) of about 0.20 mm is woven, and is configured to withstand external forces such as repeated bending, tension, and twisting applied to the cable during use.

An example of the bypass cable will be briefly described with reference to FIGS. 3 and 4. The bypass cable 1 has a shield layer 3 on a core 2 and an outer sheath 4 thereon. . The core 2 is composed of a conductor 5, an inner semiconductive layer 6, an insulator layer 7, and an outer semiconductive layer 8 in order from the center.

FIG. 5 shows the terminal structure 1 of the bypass cable 1.
A is shown. The terminal portion of the cable 1 to be connected is subjected to a terminal treatment for connection work, and the conductor 5 and the insulator (crosslinked polyethylene) layer including the inner semiconductive layer are sequentially provided from the most distal conductor 5 to the sheath 4. 7, the outer semiconductive layer 8, the shield layer 3, etc. are exposed.

A conductor connecting terminal 31 is connected to the conductor 5 of the cable thus terminated. A semiconductive portion (EP rubber) 32 and a spacer (EP rubber) 25 are formed on the conductor connection terminal 31 and the outer circumference of the cable subjected to the terminal treatment, and further insulation is provided around the outer periphery of the semiconductive portion 32 and the spacer 25. The terminal mold portion 30 is formed by integrally molding the portion (EP rubber) 33, the terminal fitting 34, and the outer semiconductive layer (semiconductive EP rubber) 35.

The outer peripheral portion of the terminal fitting 34 integrally molded with the outer periphery of the insulating portion 33 has a large diameter portion 34A and a medium diameter portion 34B.
And a metal stepped sleeve having a small diameter portion 34C. A semiconductive self-bonding tape 36 is wrapped between the outer semiconductive layer 35 and the end of the cable shielding layer 3 which is exposed after the termination.

A protective metal fitting 50, which is made of, for example, stainless steel (SUS) and has a vinyl anticorrosion layer on its outer surface, is provided so as to surround the terminal mold portion 30. The protective fitting 50 includes a cylindrical portion 50A and an inclined portion 50B, and one end of the cylindrical portion 50A is screwed and fixed to a thread groove formed in the intermediate diameter portion 34B of the terminal fitting 34. It The terminal portion 50C of the inclined portion 50B of the protective fitting 50 is fitted on the outer circumference of the rubber bush 60 fitted on the terminal-treated cable inner sheath 14.

One end (right end in FIG. 5) 37 of the copper tape 37
a is placed on the outer periphery of the shield layer 3 exposed by the cable end treatment, bound to the shield layer 3 by the tin-plated annealed copper wire 38, and then soldered. At this time, at the same time, one end 65a of the braided wire 65 is also connected to the tin-plated annealed copper wire 38.
Is bound to the shielding layer 3 and soldered.

The copper tape 37 extends toward the medium diameter portion 34B of the terminal metal fitting 34 along the outer peripheral surfaces of the semiconductive self-bonding tape 36 and the outer semiconductive layer 35, and the end portion 37b thereof.
Is the small diameter portion 34 adjacent to the medium diameter portion 34B of the terminal fitting 34.
Soldered to position C. At this time, the copper tape 37
A slack 37c is provided at the position of the inclined outer semiconductive layer 35 so as to come into contact with the inner surface of the protective fitting 50. The copper tapes 37 are provided so as to be evenly distributed at four locations on the circumference.

On the other hand, the braided wire 65 extends to the side opposite to the copper tape 37, and the rubber bush 60 and the protective fitting 5 are provided.
It is sandwiched by the terminal unit 0C of 0.

With this structure, the terminal metal fitting 34, the outer semiconductive layer 35, the protective metal fitting 50 and the like are electrically connected to the cable shielding layer 3.

[0012]

However, in the conventional bypass cable having the above-mentioned structure, when the terminal assembling work is performed,
One end 37a of the copper tape 37, which is provided at four equal positions on the circumference, is soldered after binding to the shielding layer 3 exposed by the cable end treatment, and the other end 37b of the copper tape is a terminal fitting. Soldered to 34. Therefore, heat generated when the end portion 37b of the copper tape is soldered to the terminal fitting 34 is transferred to the insulating portion (EP rubber) 33, and the electrical characteristics of the insulating portion 33 may change due to heat deterioration, resulting in stable quality. There is a problem in terms of sex.

The conventional connection of the shielding layer 3 to the terminal fitting 34 and the protective fitting 50 is performed by soldering the copper tape 37 and the braided wire 65 in a rubber molded state in the process of assembling the bypass cable terminal. Must be done by attachment. Further, the copper tape 37 is easily cut, requires skill to perform the work, and has a problem in workability.

Therefore, an object of the present invention is to improve the connection structure between the shield layer of the bypass cable and the cable end fitting,
An object of the present invention is to provide a bypass cable having a terminal structure that improves workability during terminal assembly work, achieves reliable shield layer connection, and has stable quality.

[0015]

The above object is achieved by the bypass cable according to the present invention. In summary, the present invention is a bypass cable in which a shielding layer and a sheath are arranged on a core, and a cable terminal portion integrally molds a semiconductive portion, an insulating portion, a terminal fitting, and an outer semiconductive layer. It has a terminal mold part and a protective metal fitting arranged so as to cover the terminal mold part, a conductive ring is screwed to the terminal metal fitting, and one end of a braided wire is attached to the conductive ring. The braided wire is disposed between an outer peripheral portion of the terminal mold portion and an inner peripheral portion of the protective fitting, and the other end of the braided wire is shielded by the terminal treatment of the cable. It is a bypass cable connected to the tip part of a layer.

According to one embodiment of the present invention, a rubber bush is fitted to the cable end processing portion, and one end of the protective metal fitting is fitted to an outer periphery of the rubber bush. A Kevlar holding member is provided at the end fitted on the rubber bush, and the Kevlar holding member is fixed by the Kevlar holding member that is pulled out from the cable end subjected to the terminal treatment and guided along the rubber bush.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The bypass cable according to the present invention will now be described in more detail with reference to the drawings.

The bypass cable of the present invention has the same structure as the bypass cable 1 described above with reference to FIGS. 3 and 4. That is, the shielding layer 3 and the sheath 4 are arranged on the core 2. The core 2 is composed of a conductor 5, an inner semiconductive layer 6, an insulator layer 7, and an outer semiconductive layer 8 in order from the center.

Although the shielding layer 3 of the bypass cable 1 is not limited to this, in this embodiment, it has a braided structure of tin-plated annealed copper wire. If desired, at least one having an insulating coating within the shielding layer 3 for wire breakage detection.
It is also possible to combine the detection lines of a book.

Further, on the shielding layer 3, a restraining tape 13,
Inner sheath 14, reinforcing layer (Kevlar) 15 and outer sheath 1
6 are arranged.

Next, an embodiment of the terminal structure of the bypass cable according to the present invention will be described.

FIG. 1 shows a terminal structure 1 of a bypass cable 1.
A is shown. The terminal portion of the cable 1 to be connected is subjected to a terminal treatment for connection work, and the conductor 5 and the insulator (crosslinked polyethylene) layer including the inner semiconductive layer are sequentially provided from the most distal conductor 5 to the sheath 4. 7, outer semiconductive layer 8, inner sheath 1
4, the shield layer 3 and the like are exposed.

A conductor connecting terminal 31 is connected to the conductor 5 of the cable thus terminated. A semiconductive portion (EP rubber) 32, an insulating portion (EP rubber) 33, a terminal metal fitting 34, and an external semiconductive (semiconductive EP rubber) layer 35 are integrally formed on the conductor connection terminal 31 and the outer circumference of the terminated cable. The terminal mold portion 30 molded into is formed.

To further explain, in the present embodiment, the semiconductive portion 32 is arranged in the inner and outer peripheral areas of the conductor connection terminal 31 compression-connected to the cable conductor portion 5. The semiconductive portion 32 and the insulation portion 33 integrally molded with the cable outer peripheral portion (insulator layer 7) subjected to the terminal treatment include an inclined portion 33A extending from the semiconductive portion 32 to the cable outer peripheral portion, and a semiconductive portion. A cylindrical portion 33 extending outwardly from 32, to the left in this embodiment.
B and. Therefore, between the outer periphery of the conductor connection terminal 31 and the outer inner periphery of the insulating layer 33, there is provided an annular space S for a connected terminal (not shown) to which the bypass bus terminal is connected. ₁ is formed.

The terminal fitting 34 and the outer semiconductive layer 35 are integrally molded on the outer circumference of the cylindrical portion 33B and the inclined portion 33A of the insulating portion 33. The outer peripheral portion of the terminal fitting 34 has a large diameter portion 34A, a medium diameter portion 34B and a small diameter portion 34C. A semiconductive self-bonding tape 36 is wrapped between the outer semiconductive layer 35 and the exposed cable outer semiconductive layer 8.

An attachment portion 41 of the connection nut 40 is rotatably attached to the medium diameter portion 34B of the terminal fitting 34 on the side adjacent to the large diameter portion 34A. A ball plunger 42 is arranged on the mounting portion 41. The other outer end of the connection nut 40 extends further outward than the large diameter portion 34A of the terminal fitting 34, and a thread groove 43 is formed on the inner peripheral portion thereof.
A protective cap (not shown) is screwed onto the thread groove 43 when the cable is not used.

A protective metal fitting 50 composed of a cylindrical portion 50A and an inclined portion 50B is arranged around the outer periphery of the terminal mold portion 30. Although not limited, the protective metal fitting 50 is configured to have a sleeve 50a made of metal such as stainless steel or aluminum and a vinyl anticorrosive layer 50b formed on the outer surface thereof. One end of the cylindrical portion 50A of the protective fitting 50 has a medium diameter portion 34B of the terminal fitting 34.
It is fixed with a hexagon socket set screw 51. Terminal fitting 3
4, a concave groove 52 is formed on the outer peripheral surface of the medium diameter portion 34B.
The ring 53 is arranged. Inclined part 50B of the protective fitting 50
Extends to the right in this embodiment while forming a space S ₂ between the insulating portion 33 and the inclined portion 33A, and its end portion is placed on the inner sheath 14 of the terminated cable end. The rubber bush 60 is fitted in the cylindrical portion 60A. The rubber bush 60 is provided with an inclined portion 60B which is connected to the cylindrical portion 60A.
An end portion of the rubber protection cylinder 70 fitted on the outer sheath 4 of the cable end is brought into contact with the sheath.

According to the present invention, the small diameter portion 3 of the terminal fitting 34 is provided.
A screw groove 34D is formed on the outer periphery of 4C, and the conductive step ring 100 shown in FIG. 2 is screwed into the screw groove 34D. This stepped ring 100 has a cylindrical portion 100A that is screwed into the thread groove 34D of the terminal fitting 34, and a braided wire attachment portion 100B that has a somewhat smaller diameter. A set screw hole 101 for a set screw is formed in the cylindrical portion 100A. Stepped ring 10
After being screwed into the small diameter portion 34C of the terminal fitting 34, 0 is fixed in place by a set screw 102 screwed into the set screw hole 101.

Braided wire mounting portion 100B of step ring 100
Is a plurality of, in this embodiment, 4 at equal intervals in the circumferential direction.
The braided wire of the book (only two are shown in FIG. 2), that is, one end 110a of the flat braided conductor 110 is attached by soldering. The other end 110b of the flat knitting conductor 110, an inner peripheral portion of the protective shell 50, through the formed space portion S ₂ between the inclined portion 33A of the insulating portion 33 toward the rubber bush 60 It is extended and arranged. Further, a connecting member 120 such as a superposition pressure-bonding sleeve is attached to the other end 110b of the flat knitted conductor 110.
The tip portion of the shielding layer 3 exposed by the end treatment of the cable is connected to the crimp sleeve 120 when the cable end portion is assembled.

Thus, according to the present invention, the braided wire 11
0 can be previously soldered to the conductive ring 100 at the component level, and the work of assembling the cable end portion can be simplified. Therefore, in the present invention, the problem of heat influence on the insulating portion 33 due to soldering as in the conventional case does not occur at all. Also in accordance with the present invention, a conductive ring 100 having braided wire 110 pre-soldered as described above.
By screwing the screw into the terminal fitting 34 and preventing the set screw 102 from loosening, an easy and reliable connection becomes possible.

The rubber bush 6 of the protective fitting 50.
A Kevlar holding member 80 is provided at the tip of the inclined portion 50B fitted over the zero. In this embodiment, the Kevlar holding member 80 is a cushioning material 80a such as a vinyl tube.
And a compression ring 80b having a groove on the inner peripheral surface. The Kevlar holding member 80 serves to fix the end of the Kevlar 15 sandwiched between the outer periphery of the inclined portion 60B of the rubber bush 60 and the rubber protection cylinder 70, which is pulled out from the cable end subjected to the terminal treatment.

The Kevlar holding member 80 is covered between the end portion of the rubber protection cylinder 70 fitted on the cable end sheath 4 and the protective metal member inclined portion 50B to cover the self-bonding tape 90 and the adhesive. The vinyl tape 91 is wrapped around.

With this structure, the terminal fitting 34, the outer semiconductive layer 35, the protective fitting 50, and the like can be electrically and reliably connected to the shielding layer 3.

[0034]

As described above, the bypass cable according to the present invention is a bypass cable in which the shielding layer and the sheath are arranged on the core, and the cable terminal portion includes the semiconductive portion, the insulating portion and the terminal. It has a terminal mold part in which the metal fitting and the external semiconductive layer are integrally molded, and a protective metal fitting arranged so as to cover the terminal mold part, and a conductive ring is screwed to the terminal metal fitting, and the conductive ring is attached to the conductive ring. One end of the braided wire is attached, the braided wire is arranged between the outer peripheral part of the terminal mold part and the inner peripheral part of the protective metal fitting, and the other end of the braided wire is attached.
Since it is configured to be connected to the distal end portion of the shielding layer exposed by the terminal treatment of the cable, to improve the connecting structure between the shielding layer and the cable end fitting of the bypass cable, workability in the terminal assembly work It is possible to achieve a terminal structure with improved quality and reliable shield layer connection, and stable quality.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a terminal structure of a bypass cable according to the present invention.

FIG. 2 is a perspective view of a conductive step ring.

FIG. 3 is a perspective view showing an embodiment of a bypass cable that can be used in the present invention.

FIG. 4 is a sectional view showing an embodiment of a bypass cable that can be used in the present invention.

FIG. 5 is a perspective view showing a terminal structure of a conventional bypass cable.

[Explanation of symbols]

1 bypass cable 2 cores 3 Shielding layer 4 sheath 8 External semiconductive layer 9 Metal part (metal wire) 15 Reinforcing layer (Kevlar) 30 Terminal mold part 32 Semi-conductive part 33 Insulation part 34 Terminal fittings 35 External semiconductive layer 50 protective metal fittings 60 rubber bush 80 Kevlar retaining member 100 conductive ring 110 braided wire 120 Stacked crimp sleeve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-73798 (JP, A) JP-A-7-143652 (JP, A) JP-A-7-193961 (JP, A) JP-A-7- 193962 (JP, A) JP 7-255120 (JP, A) JP 8-256429 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 15/00 H02G 15 / 02

Claims (2)

(57) [Claims] 1. A bypass cable in which a shielding layer and a sheath are arranged on a core, wherein the cable terminal portion is a terminal mold portion obtained by integrally molding a semiconductive portion, an insulating portion, a terminal fitting, and an external semiconductive layer. And a protective metal fitting disposed so as to cover the terminal mold portion, a conductive ring is screwed onto the terminal metal fitting, and one end of a braided wire is attached to the conductive ring. A wire is placed between the outer peripheral part of the terminal mold part and the inner peripheral part of the protective metal fitting.
Is, the other end of the braided wire, the bypass cable and being connected to the distal end of the exposed shield layer by the terminal treatment of the cable. 2. A rubber bush is fitted to the cable end processing portion, one end of the protective metal fitting is fitted to an outer periphery of the rubber bush, and the protective metal fitting is fitted on the rubber bush. 2. A Kevlar retaining member is provided at an end of the cable, the Kevlar retaining member is fixed to the Kevlar end that is pulled out from the cable end that has been terminated and guided along the rubber bush.
Bypass cable.