RU102833U1 - HIGH FREQUENCY CABLE FOR DIGITAL RURAL COMMUNICATION NETWORKS (OPTIONS) - Google Patents

Abstract

The claimed technical solution relates to the cable industry, namely, high-frequency rural communication cables and can be used in the construction of communication cables, namely in the construction of high-frequency rural communication cables intended for transport networks (trunk lines) and subscriber access networks with a remote power supply voltage of up to 500 V of a direct current. OPTION 1 High-frequency cable for digital rural communication networks with copper conductors with a three-layer film-porous-film polyethylene insulation, twisted into four by unidirectional twisting with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, contains a filler core made of water-blocking materials, around which four conductive conductors are twisted into four with a pitch of 140 ± 10 mm, the three-layer insulation of conductive conductors is made in the following ratio layer thickness: inner continuous layer of high pressure polyethylene, 0.02 mm thick; the average porous-polyethylene layer (main), a thickness of 0.33-0.43 mm; the outer layer is a colored film coating of high density polyethylene, with a thickness of 0.15-0.20 mm., and the waist insulation is made of water blocking tape. OPTION 2. High-frequency cable for digital rural communication networks with copper conductive conductors with a three-layer film-porous-film-film polyethylene insulation, twisted into four by unidirectional twisting with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, contains a filler core made of water-blocking materials around which insulated conductive conductors are twisted into four with a pitch of 140 ± 10 mm, three-layer insulation of conductive conductors is made in the following ratio by thickness Loev: continuous internal layer of high density polyethylene, 0.02 mm thick; the average porous-polyethylene layer (main), a thickness of 0.33-0.43 mm; the outer layer is a colored film coating of high density polyethylene, 0.15-0.20 mm thick., the belt insulation is made of water blocking tape and steel armor tape is applied over the screen from aluminum-polyethylene tape, then a bitumen layer is applied. OPTION 3. A high-frequency cable for digital rural communication networks with copper conductive conductors with a three-layer film-porous-film polyethylene insulation, twisted into four by a unidirectional twist with a belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, contains a filler core made of water-blocking materials around which four insulated conductors are twisted into four with a pitch of 140 ± 10 mm, the three-layer insulation of conductors is made in the following ratio thickness of the layers: an inner continuous layer of a high density polyethylene, 0.02 mm thick; the average porous-polyethylene layer (main), a thickness of 0.33-0.43 mm; the outer layer is a colored film coating of high density polyethylene, 0.15-0.20 mm thick., the belt insulation is made of a water blocking tape and a polyethylene sheath is applied over the screen from aluminum-polyethylene tape, then corrugated armor tape and a bitumen layer is applied to the corrugated armor tape. . OPTION 4. High-frequency cable for digital rural communication networks with copper conductive conductors with a three-layer film-gurnsto-film polyethylene insulation, twisted into four by a unidirectional twist with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath contains two armored cables in which insulated conductive cables the cores are twisted into four with a pitch of 140 ± 10 mm around the filler core made of water-blocking materials in a common polyethylene sheath, three-layer insulation of conductors yaschih lived performed in the following ratio of layer thicknesses: the inner continuous layer of a high density polyethylene, 0.02 mm thick; the average porous-polyethylene layer (main), a thickness of 0.33-0.43 mm; the outer layer is a colored film coating of high density polyethylene, 0.15-0.20 mm thick. the belt insulation is made of a water-blocking tape and a steel armor tape is applied over the screen from an aluminum-polyethylene tape, then a bitumen layer is applied. Advantages of this technical solution: - When using water-blocking materials instead of a hydrophobic filler for moisture-proof cable, there is no effect on the film-porous-film insulation, the dielectric and mechanical properties of the insulation do not change. - The use of water-blocking materials facilitates the cutting of cable ends during installation. It is not necessary to use special fluids, usually flammable, to wash off the hydrophobic aggregate; the cable remains clean and dry during installation. There is no need to use special couplings with hydrophobic aggregate. - The thickness of the layers of film-porous-film insulation is selected in the following ratio: inner continuous layer - 0.02 mm; the average porous layer is 0.33-0.43 mm; the outer layer is painted - 0.15-0.20 mm., provides insulation resistance of conductive conductors 50% higher and the working capacity 10% lower than the analogue, which leads to a decrease in the attenuation coefficient of the cable by 11-12%, as a result it increases signal transmission range and reducing the number of amplification stations. - The use of conductive conductors with a diameter of 1.20 mm reduces the ohmic resistance and increases the transmission range of information, which leads to a decrease in amplification devices and service points.

- The use of a two-cable cable (Figure 4) allows you to double the number of channels, at lower cost compared to laying two single-cable cables.

Description

The claimed technical solution relates to the cable industry, namely, high-frequency rural communication cables and can be used in the construction of communication cables, namely in the construction of high-frequency rural communication cables intended for transport networks (trunk lines) and subscriber access networks with a remote power supply voltage of up to 500 V of a direct current.

Known electrical communication cable (Options), utility model 27263 from 06/13/2002

High-frequency single-channel cable for rural rural digital networks, consisting of twisted copper conductive cores insulated with polyethylene in the form of a concentric film-porous-film layer, with the outer and inner layers made of solid polyethylene, the middle layer of foamed (porous) polyethylene, with extruded polyethylene belt insulation, with a screen made of aluminum-polymer tape, in a polyethylene sheath, with a hydrophobic core filling and a hydrophobic layer on top of the waist insulation or cable l high-frequency single-channel for digital rural communication networks, consisting of twisted copper conductive cores insulated with polyethylene in the form of a concentric film-porous-film layer, while the outer and inner layers are made of solid polyethylene, the middle layer is made of foamed (porous) polyethylene, with belt insulation made of pressed polyethylene, with a screen made of aluminum-polymer tape, with a separation layer of polyethylene, armored corrugated steel tape with a double-sided polymer coating, to a protective polyethylene hose, with hydrophobic core filling and a hydrophobic layer on top of the belt insulation.

Known high-frequency cable for digital rural communications networks, performed according to TU 16.K01-32-2002, developed by OJSC "Electrocable" Kolchuginsky Plant "together with LONIIS (www.elcable.ru), Cross section: 10.6 12.8 cores: 1 × 4 with film-porous-film polyethylene insulation cores, with a screen made of aluminum-polymer tape, in a polyethylene sheath

1. The conductive core of round copper wire.

2. Insulation from polyethylene in the form of a concentric film-porous-film layer. Nominal insulation thickness is: for conductors with a diameter of 0.64 mm - 0.43 mm

for conductors with a diameter of 0.9 mm - 0.60 mm

for cores with a diameter of 1.2 mm - 0.45 mm

3. Four insulated conductors are twisted into a four. In the four, two veins located diagonally form a working pair, the insulation of the first pair of 4 wires has the colors: red, yellow or unpainted; the second pair is green, blue or blue.

4. Filling the core free space - hydrophobic aggregate.

5. Belt insulation made of extruded polyethylene with a nominal thickness of 0.8 mm.

6. A layer of hydrophobic aggregate is applied over the belt insulation.

7. Screen made of alumina tape. A tinned contact copper wire with a nominal diameter of 0.4-0.5 mm is laid under the screen.

8. Shell made of polyethylene with a nominal thickness of 1.8 mm.

The main disadvantages of the above technical solutions are: the use of a hydrophobic filler to ensure moisture impermeability of the cable leads to an increase in working capacity and lower insulation resistance, as a result of an increase in attenuation coefficient, reduction in transmission distance, the need to use an additional number of amplification stations.

The objective of the proposed technical solution is to create a high-frequency communication cable for digital rural communication networks, designed for transport networks (trunk lines) and subscriber access networks by creating a stable core shape and reducing the range of pitch twisting steps of the core, as well as a moisture-proof cable by using water-blocking materials, and increasing the transmission range of signals and reducing the number of amplification stations.

The task is as follows:

High-frequency local communication cable with copper conductive conductors with a three-layer film-porous-film polyethylene insulation, twisted into four by unidirectional twisting with pressed-in polyethylene belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, while the insulated conductive wires are twisted into four with a pitch of 140 ± 10 mm around a filler core made of polyethylene or water blocking materials. In the four, two veins, located diagonally, form a working pair, the insulation of the wires of the first pair of four is of natural color, the second pair is blue. In two-cable cables, the insulation color of the second pair of the second four is different from the insulation color of the second pair of the first four.

The claimed technical solution is illustrated in figure 1, figure 2, figure 3, figure 4.

Figure 1 shows a section of a cable (OPTION 1) containing conductive conductors 1, insulated with a three-layer film-porous-film insulation 2, filler core 3, waist insulation 4, contact copper wire 5, aluminum-polyethylene shield 6, polyethylene sheath 10.

Figure 2 presents a section of a cable (OPTION 2) containing conductive conductors 1, insulated with a three-layer film-porous-film insulation 2, core-filler 3, waist insulation 4, contact copper wire 5, aluminum-polyethylene shield 6, steel armor tape 8, bitumen coating 9, protective polyethylene sheath 10.

Fig. 3 shows a section through a cable (OPTION 3) containing conductive conductors 1, insulated with a three-layer film-porous-film insulation 2, a filler core 3, a waist insulation 4, a contact copper wire 5, an aluminum-polyethylene shield 6, a polyethylene sheath 7, an armor tape 8 corrugated steel, bitumen coating 9, protective polyethylene sheath 10.

Figure 4 presents a section of a two-cable cable (OPTION 4) containing two armored cables of Figure 2 or Figure 3 in a common polyethylene sheath 10.

Cables are used to work on rural communication networks for inter-rural rural communication lines, transport networks for the organization of traditional telephone communications with the function of subscriber access networks.

Cables are designed for installation in telephone conduits, in collectors of mines, along walls of buildings and suspensions on overhead communication lines, in soil not subject to displacement, in areas characterized by an increased risk of damage by rodents, including in conditions of high humidity.

The main element of a symmetrical cable is an electric circuit, consisting of four insulated copper conductive cores 1 twisted into four (Figure 1, Figure 2, Figure 3,) with a nominal diameter of 0.64; 0.90 and 1.20 mm. Insulation of conductive conductors 2 (Figure 1, Figure 2, Figure 3) - three-layer polyethylene insulation: inner continuous layer - film insulation of high pressure polyethylene, 0.02 mm thick; the average porous-polyethylene porous layer (main) obtained by the method of physical foaming with nitrogen, a thickness of 0.33-0.43 mm; the outer layer is a colored film coating of high density polyethylene, which imparts mechanical strength to the insulation, with a thickness of 0.15-0.20 mm. This insulation also has high dielectric uniformity and geometric stability, the use of physical foam expansion technology allows us to provide a given value of the working capacity in pairs, due to the automated control of the diameter of the insulated core, linear capacity and eccentricity during its manufacture, working capacity:

for conductors with a diameter of 0.64 mm and 0.90 mm - 32 3 nF;

for conductors with a diameter of 1.20 mm - 40 3 nF.

The combined process of drawing a conductive core, annealing and applying film-porous-film insulation allows you to provide ohmic asymmetry of the cores in pairs:

for conductors with a diameter of 0.64 mm no more - 0.7 Ohms;

for cores with a diameter of 0.90 mm and 1.20 mm - no more than 0.3 Ohms

Unidirectional twisting of insulated cores 1 into four around the filler core 3 is necessary to give the cable a stable shape, to prevent overlapping of cores in the four, as well as to reduce mutual electromagnetic influences inside the cable core. Four insulated conductors are twisted into a four with a twist pitch of 140 ± 10 mm, which ensures stable electrical parameters, the protection of cable chains from mutual and external influences, reducing the range of the twist pitch inside the core, we perform the task of the claimed technical solution.

To ensure the moisture resistance of the cable in conditions of high humidity, the following are provided: in the center of the twisted core there is a cordel 3 (Fig. 1, Fig. 2, Fig. 3, Fig. 4) of water-blocking material, and belt insulation 4 of a water-blocking tape over the core.

Additional protection against electromagnetic effects of symmetrical high-frequency cables is achieved by creating an electrostatic aluminum screen 6 (Figure 1, Figure 2, Figure 3, Figure 4). An aluminum-polymer tape with an aluminum layer with a nominal thickness of 0.15 mm is applied spirally or longitudinally with an overlap of at least 15%. A tinned copper contact wire 5 with a nominal diameter of 0.3-0.4 mm is laid under the screen.

Cables are made in a sheath of polyethylene 10 (Figure 1, Figure 2, Figure 3, Figure 4).

To protect the cable from mechanical stress and rodents, protective covers are used, consisting of: armor 8 made of steel (Figure 2, Figure 4) or corrugated steel (Figure 30), and a protective polyethylene hose 10 (all figures)

The advantages of this technical solution:

- When using water-blocking materials instead of a hydrophobic filler for moisture-proof cable, there is no effect on the film-porous-film insulation, the dielectric and mechanical properties of the insulation do not change.

- The use of water-blocking materials facilitates the cutting of cable ends during installation. It is not necessary to use special fluids, usually flammable, to wash off the hydrophobic aggregate; the cable remains clean and dry during installation. There is no need to use special couplings with hydrophobic aggregate.

- The thickness of the layers of film-porous-film insulation is selected in the following ratio:

inner continuous layer - 0.02 mm;

the average porous layer is 0.33-0.43 mm;

the outer layer painted - 0.15-0.20 mm., provides insulation resistance of conductive conductors 50% higher, and the working capacity pa 10% lower than the analogue, which leads to a decrease in the attenuation coefficient of the cable by 11-12%, as a result increases signal transmission range and reducing the number of amplification stations.

- The use of conductive conductors with a diameter of 1.20 mm reduces the ohmic resistance and increases the transmission range of information, which leads to a decrease in amplification devices and service points.

- The use of a two-cable cable (Figure 4) allows you to double the number of channels.

Claims (4)

1. High-frequency cable for digital rural communication networks with copper conductive conductors with a three-layer film-porous-film-film polyethylene insulation, twisted into four by unidirectional twisting with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, characterized in that it contains a filler core made of water-blocking materials, around which four insulated conductive conductors are twisted into a four with a step (140 ± 10) mm, three-layer insulation of conductive conductors is made as follows the general ratio according to the thickness of the layers: inner continuous layer of high pressure polyethylene 0.02 mm thick; the average porous-polyethylene layer (main) 0.33-0.43 mm thick; the outer layer is a colored film coating of high density polyethylene with a thickness of 0.15-0.20 mm, and the belt insulation is made of water blocking tape. 2. High-frequency cable for digital rural communication networks with copper conductors with a three-layer film-porous-film-film polyethylene insulation, twisted into four by unidirectional twisting with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, characterized in that it contains a filler core made of water-blocking materials, around which four insulated conductive conductors are twisted into a four with a step (140 ± 10) mm, three-layer insulation of conductive conductors is made as follows the general ratio according to the thickness of the layers: inner continuous layer of high pressure polyethylene 0.02 mm thick; the average porous-polyethylene layer (main) 0.33-0.43 mm thick; the outer layer is a painted film coating of high density polyethylene with a thickness of 0.15-0.20 mm, the belt insulation is made of water blocking tape and steel armor tape is applied over the screen from aluminum-polyethylene tape, then a bitumen layer is applied. 3. High-frequency cable for digital rural communication networks with copper conductive veins with a three-layer film-porous-film-film polyethylene insulation, twisted into four by unidirectional twisting with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, characterized in that it contains a filler core made of water-blocking materials, around which four insulated conductive conductors are twisted into a four with a step (140 ± 10) mm, three-layer insulation of conductive conductors is made as follows the general ratio according to the thickness of the layers: inner continuous layer of high pressure polyethylene 0.02 mm thick; the average porous-polyethylene layer (main) 0.33-0.43 mm thick; the outer layer is a colored film coating of high density polyethylene 0.15-0.20 mm thick, the belt insulation is made of a water blocking tape and a polyethylene sheath is applied over the screen from aluminum-polyethylene tape, then corrugated armor tape and a bitumen layer are applied to the corrugated armor tape. 4. High-frequency cable for digital rural communication networks with copper conductive conductors with a three-layer film-porous-film-film polyethylene insulation, twisted into four by unidirectional twisting with belt insulation, with a screen made of aluminum-polyethylene tape in a polyethylene sheath, characterized in that it contains two armored cables, in which the insulated conductive conductors are twisted into a four with a step (140 ± 10) mm around the filler core of water-blocking materials in a common polyethylene sheath, three-layer of The conductive core was insulated in the following ratio by layer thickness: inner continuous layer of high-pressure polyethylene 0.02 mm thick; the average porous-polyethylene layer (main) 0.33-0.43 mm thick; the outer layer is a colored film coating of high density polyethylene with a thickness of 0.15-0.20 mm, the belt insulation is made of water blocking tape and steel armor tape is applied over the screen from aluminum-polyethylene tape, then a bitumen layer is applied.