RU139698U1 - CABLE OPTICAL COMBINED - Google Patents

Abstract

Combined optical cable containing multi-conductive conductors with polymer insulation twisted around a zero carrier of a multi-wire core and a tube with an optical fiber located in it, characterized in that the tube with optical fiber is located inside the zero carrier of a multi-wire core.

Description

This utility model relates to an optical cable, namely, to designs of combined cables intended for the complex construction of power lines and transport communication networks.

Currently, due to the increase in data transmission in the telecommunications sector, the widespread construction of intra-city FOCL transport networks (fiber-optic communication line) has begun throughout the Russian Federation. When choosing the infrastructure for the placement of fiber-optic cable, construction and design organizations, telecom operators were faced with the fact that the only accessible and optimal infrastructure for placing intra-city FOCLs are the urban supports, in particular, the street lighting poles and overhead power transmission towers with voltage 0.4-20 kV. The vast majority of these networks were built 20 or more years ago and are in a dilapidated, depressing state. If the permissible mechanical loads of the line are exceeded as a result of placing additional elements on the supports in the form of cables, wires, the destruction of the support occurs, which further leads to the line breaking. In addition, the placement of fiber optic cables on these supports impairs the aesthetics and architecture of city streets.

The prior art combined electro-optical self-supporting insulated wire with a zero core conductor (see RU 80279 U1, H01B 11/22, 2008). The self-supporting insulated wire contains at least one multi-wire conductive core of aluminum with polymer insulation twisted around a zero support multi-wire core of aluminum alloy or non-insulated steel or polymer insulation. Additionally, the wire contains at least one optical fiber enclosed in a metal, fiberglass or polymer tube. The tube is filled with a hydrophobic gel and contains a power element in the form of high modulus threads (aramid threads). Outside, the tube has a power element made of high-modulus threads or metal wires in the form of coils or braids, as well as an external protective polymer shell. Also, the wire further comprises auxiliary conductive insulated conductors.

The disadvantage of this utility model is the increase in cable weight due to the removal of the optical cable and the application of a protective sheath to it. As a result, the ratio of the weight of the optical fiber itself (the useful part of the optical cable, about 2 g per 1 meter) to the total weight of the optical cable (about 140 g per 1 meter) as part of a combined electro-optical self-supporting insulated wire with a zero core conductor is about 1.43% . The weight of the protective shell, including the power element in the form of high-modulus threads, a hydrophobic gel, a braid of high-modulus or metal threads, a polymer shell, is approximately 98.57%.

Another disadvantage of this utility model is the high cost of the cable due to the use of high-modulus aramid fiber filaments, as well as the need to use a protective sheath for the optical cable. Also, during installation work on the suspension of this wire, installation difficulties arise due to the danger of mechanical damage to the optical fibers due to the fact that the optical cable is not fixed rigidly in the coil of the wire, but is twisted with the wires of the steel-aluminum wire.

The task was to develop a combined cable with a lightweight design due to the use of self-supporting insulated wires as a power supporting element in order to minimize the additional load on the supports of the urban economy when hanging the wok.

The technical result is achieved in that in an optical combined cable, including multi-conductive conductive conductors with polymer insulation, twisted around a zero carrier of a multi-wire core, and a tube with an optical fiber located in it, a tube with optical fiber is located inside the zero carrier of a multi-wire core.

The utility model is illustrated with a specific embodiment with reference to the accompanying drawings, in which:

figure 1 is a view in cross section of an optical cable combined with modules with optical fibers located in a tube built into the center of the core;

figure 2 is a schematic view of a zero carrier of a multi-wire core with a tube built into its center containing modules with optical fibers.

The structure of the optical combined cable 1 (Fig. 1) contains modules with optical fibers 2 (Figs. 1, 2) with a total number of up to 128 pieces, placed in a metal tube 3 (Figs. 1, 2), which is built into the center of the zero load core 4 ( Figure 1, 2) steel insulated wire (SIP). Around the zero core 4 (Figure 1, 2), containing a tube 3 (Figure 1, 2) with modules with optical fibers 2 (Figure 1, 2), insulated phase conductive wires 5 are twisted (Figure 1). As the insulation of phase 5 (Figure 1) and zero 4 (Figure 1, 2) cores, cross-linked polyethylene 6 (Figure 1) is used. The metal tube 3 may contain a hydrophobic gel to protect modules with optical fibers 2.

The structure of the combined optical cable 1 (Fig. 1) with a zero load core 4 (Fig. 1, 2) containing a metal tube 3 (Fig. 1, 2) with modules with optical fibers 2 (Fig. 1, 2) allows to minimize the number of cables and wires suspended on supports of the urban economy, in particular, street lighting poles and overhead power transmission poles with voltage of 0.4-20 kV, due to the combination of communication functions and electric power transmission in one cable. Also, due to the combination of self-supporting insulated wire and modules with optical fibers in one cable, conditions are created to ensure the integrated construction of power lines and transport communication networks both in new construction and in the reconstruction of electrical networks. In addition, the number of fittings used for fastening is reduced while building a communication line and power lines on the supports of the municipal economy, since it is not necessary to use additional special cable, including spiral, fittings, but it is enough to use fittings for fastening a self-supporting insulated wire.

Due to the structure of this utility model, optical fibers with a small external diameter are used, which makes it possible to place up to 128 fibers in the cable.

Due to the absence of load-bearing elements in the structure of the fiber-optic part of the combined optical cable, as well as the rejection of the external protective sheath and the transfer of the functions of these elements to the zero core, the cost of building a fiber-optic communication line is significantly reduced.

Characteristics of the optical combined cable:

- working wavelengths of 1.31 and 1.5 microns;

- OM attenuation coefficient in the cable at operating wavelengths of not more than 0.5 and 0.3 dB / km, respectively;

- the electrical resistance of 1 km of the phase conductive core to direct current, Ohm, with a cross section of 16 mm ² to 95 mm ^2, respectively, is no more than 1.91 to 0.253 Ohm (according to the specification of the SIP wire);

- the electrical resistance of 1 km of the zero conductive core to direct current, Ohm, with a cross section of 25 mm ² to 95 mm ² is respectively no more than 1,380 to 0,363 Ohm (according to the specification of the SIP wire);

- breaking load of at least 6 kN;

- resistance to unwinding at a speed of at least 1.388 m / s;

- resistance to temperature during operation in the range from - 60 ° to + 55 ° C.

Claims (1)

Combined optical cable containing polymer-insulated multi-conductive conductors twisted around a zero carrier multi-wire core and a tube with an optical fiber located therein, characterized in that the optical fiber tube is located inside the zero multi-wire core.

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