JPS5862602A - Optical cable of light composite overhead ground wire - Google Patents

Abstract

PURPOSE:To prevent optical fibers from an increase of disconnection and loss in case of drawing an optical cable in and out of an overhead ground wire, by using a material, the outer part of which is subjected to braid having wear resistance as the optical cable of light composite overhead ground wire. CONSTITUTION:A core of optical fibers 2 coated with silicone polymer 3 is stranded around a central line 1 having high tensile strength, and a silicon polymer sheath 5 is treated at its outer periphery through a nonadhesive interlayer 4, and further a wear resistant braid is treated at its outer side, and an optical cable is constituted. The braid 6 consists of a metallic wire or polyamide fibers and relaxes the wear resistance between the inner surface of the overhead ground wire and the optical cable.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to original cables, especially original cables used in Koreikai overhead areas. 1- for 54 good.

Recently, the Hikari Noaino 5-cable can transmit the information of the large lid,
In addition, due to the low loss, black brocade insulator, and +y characteristics, it can be used in combination with the transmitter m-, making it easier to use than conventional power transport or microwave communication. It is attracting attention because it can transmit large amounts of data.

In the case of transmission lines, taking into account various circumstances, optical fiber cables are installed at the edge of the overhead area to prevent information transmission between the substation and substation, transmission of power transmission and repair information, and television interference. Optical cables used for such purposes are considered to be used for purposes such as countermeasures, but optical cables used for such purposes are cables that connect overhead ground wires with internal voids. IjIaIl! It is being considered that it could be incorporated into the system.

By the way, the original overhead cable may be disconnected or reconnaissance I
In the event of a failure such as when the cable is overloaded, it is difficult to maintain the entire overhead ground wire, so it is better to run a new original cable through the overhead ground wire and replace it.

When performing such pulling out or pulling through.

If a large tension is applied, the original fibers will break, so it is necessary to reduce the resistance of the umbrella part of the 9F 1P cable jacket and the inner surface of the overhead ground wire, and to reduce the load distribution to the optical fiber 9. This is where they are asked to be.

The present invention has been developed in response to such demands, and provides an optical cable with an optical composite overhead ground wire in which a wear-resistant braid is applied to the outermost part of the optical cable. The present invention provides an optical cable in which the braid is provided directly above the sheath of the optical cable, the sheath of the redundant cable, and a thermoplastic resin edge member placed between the wear-resistant braid.

Here, as the wear-resistant braid, a wear-resistant metal or synthetic fiber such as steel wire or polyaramid fiber is applied.
The structure of such an optical cable that uses abrasion-resistant braiding is the same as the conventional one, for example, the structure of the light-moving BS5S-T6299Z4J, which has a tensile strength of 900 mm, is applied to the same applicant. Optical cables with a #5i cable core and an external sheath and a reconvoluted/reconvoluted sheath with excellent heat resistance are applied, as well as a non-adhesive intermediate layer between the optical fiber 9 and the sheath. Optical cables with less buckling bending can be used.

Next, draw this invention! For reference and explanation, Figure M1 is a cross-sectional view showing an example of the optical cable of the present invention, which has a tensile strength line 1 at the center, and a silicone polymer 3 is temporarily covered around it. The six cores of 2 are twisted together, and a silicone polymer sheath 5 is attached to the outer periphery of the core through a non-adhesive intermediate layer 4.
is applied thereto, and a wear-resistant braid 6 is further applied to the outside thereof to constitute the optical composite optical cable of the present invention.

In such a cable, the outermost layer is provided with a wear-resistant braid 6 such as gold 1I411s or polyaramid fiber (Kevlar, a product of DuPont), which reduces frictional resistance on the inner surface of the overhead ground wire, and can be used to connect, for example, a 400 m long overhead ground wire. When I conducted a test after drawing □, ', 4, I was able to obtain □6111 for 8 months.

By the way, although silicone resin has excellent heat resistance and elasticity, it expands by about 50 degrees at 250° C. However, when the wear-resistant braid is made of gold X11 or polyaramid fiber, it hardly expands. Therefore, when a lightning strike or an unbalanced current occurs and the overhead ground becomes hot, the silicone resin sheath tries to expand, but the outer periphery is suppressed by a wear-resistant material that does not expand (because it cannot expand, resulting in As a result, irregular stresses are applied to the inner optical fibers, resulting in a microbesiding loss of the optical fiber J/C=r.

FIG. 2 is a cross-sectional view showing another example of the optical cable of the present invention based on the above-mentioned viewpoint, in which six fibers of optical fibers 2 having a tensile strength line 1 at the center and coated with silicone polymer 3 are formed around the tensile strength line 1. A silicone polymer sheath 5 is applied to the outer periphery of the strands with a non-adhesive intermediate layer 4 interposed therebetween.
etc., a thermoplastic resin such as polyethylene M7 is placed on top of which the abrasion-resistant set 6 is applied, and the jt, li! of the present invention is applied. It constitutes a combined overhead ground wire cable.

Thus, when the overhead ground wire becomes high temperature due to a lightning strike or the like, the thermoplastic resin string 7 melts and leaks to the outside, allowing the silicone resin sheath 5 to expand and no stress is applied to the optical fin. - As described above, since the cable of the present invention has the wear-resistant braid 6 such as metal wire or polyaramid fiber in the outermost layer, it is possible to easily pull the wear-resistant braid 6 and draw the cable in. Deself,
In particular, when metal wire or polyaramid fiber is used, the frictional resistance with the inner surface of the overhead ground wire is small, so
Since the tension of the optical fiber is small and the load distribution to the optical fiber 91 is small, the optical fiber, ? There is little risk of disconnection.

Furthermore, since a thermoplastic resin string is interposed between the wear-resistant braid and the outer sheath, even if the overhead ground wire becomes hot due to a lightning strike or unbalanced current, the thermoplastic resin string will melt and will not flow outside. Since it leaks and allows expansion of the outer sheath, no stress is applied to the optical phinon core, and the high temperature characteristics of optical phinons can be satisfied.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the optical composite overhead ground wire optical cable of this invention, and FIG. 2 is a cross-sectional view showing another embodiment of the same. Representative Patent Attorney Mamoru Take 6

Claims (1)

[Scope of Claims] (1) An optical cable of an optical composite overhead ground wire in which a wear-resistant braid is provided on the outside of the optical cable (2) A wear-resistant braid is provided directly above the sheath of the optical cable. An optical cable (3) of an optical composite overhead ground wire according to claim 1, characterized in that a thermal AF plastic resin linear body is positioned in the sheath and wear-resistant structure of the optical cable. Ilk
Claim 1 XJ or M2 - Source cable of optical composite overhead ground wire (4) Abrasion resistance - A set of steel wires or polyaramid fibers Claim 111mgClaims 1 and 2 Item or #! Optical composite overhead ground/line optical cable (6) Disposed of in Clause 3. Optical composite overhead ground cable according to Claim 1, 2 or 3, in which the optical cable sheath is made of silicone polymer.