RU168018U1 - Communication cable symmetrical high-frequency - Google Patents

Abstract

The utility model relates to cable technology, namely to the design of symmetric high-frequency communication cables. The cable contains copper conductive conductors 1, insulated with colored polystyrene cordele 2 and a composite film 3. Four insulated conductors are twisted around the corridor 4 into star quadruples 5, wrapped with colored fastening elements 6. Star quadruples are twisted into the core 7. Belt insulation 8 is sequentially applied over the core, identification tape 9 and screen 10. An additional layer of bitumen 11 and a protective hose made of polymer material 12 can be additionally applied over the screen. Over the screen, additionally can be applied a pillow 13, an armor 14 and an outer cover made of a layer of bitumen 15, an impregnated cable yarn 16, a layer of bitumen 17 and a coating that protects the coils of the cable from sticking 18. The technical result is increased reliability and reduced breakage of insulation during production and during installation and repair -restoration work on cable communication lines.

Description

The utility model relates to cable technology, namely, to the design of symmetric high-frequency communication cables intended for laying in communication networks.

Communication cables of symmetric high-frequency type MKSA are known, having conductive copper conductors insulated with colored polystyrene thread (cordelet) and polystyrene film, superimposed overlapping to the side opposite to the direction of application of the thread. Four conductors with insulation of various colors are twisted around the corridor in a star four, wrapped in an open spiral with colored fastening elements. The star quadruples are twisted into the core of the cable, on top of which a belt insulation is sequentially applied, a screen in the form of a metal shell coated with bitumen, and a protective hose made of a polymer material (GOST 15125-92).

A significant drawback of such a cable is the lack of reliability and increased breakage of the polystyrene insulation film of cores during cable production and installation and repair work on cable communication lines.

The technical result, which the utility model aims to achieve, is to increase the reliability and reduce the breakage of the insulation of the cable cores, as well as reduce the complexity during installation and repair work on cable lines.

The technical result is achieved by the fact that in a symmetrical high-frequency communication cable containing conductive copper conductors, insulated with colored polystyrene filament (cordelet) and a polymer film superimposed in the direction opposite to the direction of the filament, twisted around the cordule of the polymeric material in star fours, wound open spirals with colored fastening elements, twisted in turn into a core, sequentially superimposed on the core by a belt insulation of cable paper tapes and a screen, limernaya film is made of composite material, consisting for example of polyethylene terephthalate film and a polyethylene film or polypropylene film and polyethylene terephthalate film or polyimide film and polyethylene terephthalate film or polyimide film and polyethylene film, or polyamide film and polypropylene film laminated together.

In one embodiment, the cable may have an identification tape located along the core between the layers of waist insulation.

In another embodiment, the cable may have a shield in the form of a lead, or aluminum, or steel sheath.

In a further embodiment, the cable over the screen may have bitumen layers and a protective hose made of a polymer material.

In the following embodiment, the cable over the screen may have a sequentially applied pillow made of alternating layers of bitumen and polymer tapes, and / or tapes of crepe paper, and / or cable impregnated paper, armor made of steel or galvanized steel tapes, an outer cover made of a layer of bitumen, impregnated cable yarn or glass yarn, a layer of bitumen and a coating that protects the coils of the cable from sticking together.

The utility model is illustrated by drawings (Fig. 1, Fig. 2 and Fig. 3), which show cables in section.

In FIG. 1 shows the cable in the screen.

A symmetric high-frequency communication cable contains copper conductive conductors 1, insulated with polystyrene filament 2 and composite film 3, laid in the direction opposite to the direction of the filament. Four insulated conductors, of different colors, are twisted around the corridor 4 into star quadruples 5. The star quadruples 5, wrapped in an open spiral with colored fastening elements 6, are twisted into a core 7. A belt insulation 8, identification tape 9 and a screen 10 are sequentially applied over the core. .

In FIG. 2 shows a cable in the screen with a layer of bitumen 11 and a protective hose 12.

In FIG. Figure 3 shows the cable in the screen with a pillow 13, armor 14 and an outer cover made of a layer of bitumen 15, impregnated cable yarn or glass yarn 16, a layer of bitumen 17 and a coating that protects the cable turns from sticking 18.

Cable manufacturing technology is based on the use of industrial cable equipment and is as follows.

Drawing and annealing of copper wire for copper conductive conductors 1 are carried out on drawing machines with annealing installation.

Copper conductive conductors 1 are insulated with polystyrene filament 2 and composite film 3 on a paper-insulating machine.

Insulated cores are twisted around the corridor 4 into a star four 5, which is wrapped with fastening elements 6 on a twisting machine SZCH-2M.

Star quads 5 are twisted into a core 7 on torsion-type machines of a lantern type.

The imposition of belt insulation 8 in the form of a winding of cable tape and identification tape 9 is carried out on winding machines.

The overlay of the screen in the form of a lead sheath 10 is made on a worm press.

The application of a layer of bitumen 11 and a protective hose 12, FIG. 2, is produced on an extrusion line.

The application of the pillow 13, FIG. 3, produced on winding machines.

Armor 14, FIG. 2, is made on reservation machines.

The application of an outer cover consisting of a layer of bitumen 15, cable yarn or glass yarn 16, a layer of bitumen 17 and a coating that protects the cable turns from sticking 18, FIG. 3, is made on reservation machines.

Cable specifications

The insulation resistance of cable cores is not less than 12000 MΩ⋅km.

50 Hz AC test voltage for 2 min

- between the group of all lived and the screen - 2000 V

- between the group of all red and yellow veins and the group of all blue and green veins connected to the screen - 1300 V.

Working capacity:

- four-cable cables - 25.4 ± 1.0 nF / km,

- seven-four cables - 24.0 ± 1.0 nF / km.

Transient attenuation at the near end between pairs in the frequency range up to 252 kHz - at least 59 dB over a length of 825 m.

Security at the far end between pairs in the frequency range up to 252 kHz - at least 68 dB over a length of 825 m.

The attenuation coefficient at a frequency of 250 kHz is 2.65 dB per 1000 m length.

Physico-mechanical parameters of polymer films used for insulation of cores, extracted after processing into a cable, are shown in table 1.

The relative elongation of the composite film is several times greater than that of the polystyrene film, which ensures their reduced breakage both during production and during installation and repair work on cable communication lines.

Claims (6)

1. A symmetric high-frequency communication cable, containing insulated polystyrene cordell and a polymer film, applied to the side opposite to the direction of the cordel, conductive copper conductors twisted around star corridors in quadruples, wrapped in an open spiral with fastening elements, twisted in turn into a core, sequentially applied on the core, belt insulation of cable paper tapes and a screen, characterized in that the polymer film is made of composite material. 2. The cable according to claim 1, characterized in that an identification and measuring tape is located under or between the tapes of the belt insulation. 3. The cable according to claim 1, characterized in that the screen is made in the form of a lead, or aluminum, or steel sheath. 4. The cable according to claim 1, characterized in that a layer is located on top of the screen bitumen and protective hose made of polymer material. 5. The cable according to claim 1, characterized in that a cushion of alternating layers of bitumen, polymer tapes, and / or crepe paper tapes and / or cable impregnated paper, armor made of steel or galvanized steel tapes, an outer cover made of a layer of bitumen, impregnated cable yarn or glass yarn, a layer of bitumen and a coating that protects the coils of the cable from sticking.

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