RU166980U1 - COMMUNICATION CABLE HIGH FREQUENCY - Google Patents

Abstract

1. High-frequency cable for digital networks, having: a conductive core consisting of copper single-wire insulated conductors twisted into fours, which, in turn, are twisted together; on top of the core is a belt insulation and a sheath of polyethylene, where the insulation of the conductive wires is made of three layers - the outer and inner layers of solid polyethylene, the middle layer is made of porous polyethylene, characterized in that the total insulation thickness of the conductive wires reaches at least 1.0 mm .2. A cable according to claim 1, characterized in that a screen of aluminum-polyethylene tape is laid over the belt insulation and a tinned copper contact wire with a diameter of at least 0.4 mm is laid along the screen. The cable according to claim 1, characterized in that the nominal diameter of the conductive core is 1.2 mm. 4. The cable according to claim 1, characterized in that the twisting steps of the insulated conductors in different fours differ and must be at least 300 mm. 5. The cable according to claim 1, characterized in that in the cable the nominal number of twisted fours is 4.6. The cable according to claim 1, characterized in that in the cable the nominal number of twisted fours is 7.

Description

The utility model relates to cable technology, namely to high-frequency multi-channel communication cables for ATS, MTS and internal electrical installations. The cable has an extended scope - it is intended for group laying in buildings and structures with a mass stay of people, including multi-purpose high-rise buildings and complex buildings.

The nominal frequency of signal transmission through the claimed cables is up to 5000 kHz.

Known high-frequency communication cable with paper-cord insulation in a lead sheath (NI Belorussov, AE Sarkasyan, AI Yakovleva, publishing house "Energy". M., 1979).

This cable is made of single-wire copper, insulated with a single layer of polyethylene insulation, twisted into four, coated with a hydrophobic filling, on top of which a belt insulation is made of extruded polyethylene, over which a screen is applied, under which a contact copper wire is applied. On top of the insulation there is armor made of steel tapes or wires. A polyethylene sheath is applied over the belt insulation, or a plastic hose is applied over the armor. The maximum frequency of signal transmission on such lines is up to 550 kHz.

The disadvantage of such high-frequency communication cables is the low frequency of signal transmission with low reliability of these cables.

The closest analogue of the claimed technical solution of the cable is the technical solution of the cable, patented as a utility model No. RU (11) 27 263 (13) U1. High-frequency single-channel cable for digital rural communication 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 belt insulation made of extruded polyethylene, with a screen made of aluminum-polymer tape, in a polyethylene sheath with an insulation thickness of veins up to 0.7 mm, which cannot provide the necessary equipment for modern technology Ki signal transmission frequency up to 5000 kHz.

The technical result from the use of the proposed technical solution:

- a significant increase in the frequency of transmitted signals (up to 5000 kHz), which improves the quality of signal transmission: the attenuation coefficient decreased from 0.94 dB / km to 0.76 dB / km, the maximum capacitance decreased from 38 nF / km to 5.5 nF / km, this result was achieved due to the fact that it was possible to determine the optimal ratio of cable parameters that affect the frequency of signal transmission via cable:

- conductive single-wire veins made of soft copper wire;

- thickness of the conductive core - 1.2 mm;

- the nominal number of fours in the cables can be - 4, 7;

- the insulation of these cores is made of three layers. The first and third layers are made of solid polyethylene, the second layer is made of porous with a total insulation thickness of conductive wires of at least 1.0 mm;

- the twisting steps of insulated cores in different fours vary and must be at least 300 mm;

- a tinned copper contact wire with a nominal diameter of at least 0.4 mm is laid under the screen.

Description of the claimed technical solution

The high-frequency communication cable (hereinafter referred to as the cable) is made of a core consisting of copper conductors, on top of which are sequentially applied: belt insulation, screen and sheath.

Belt insulation can be made of polymer tapes.

The screen is made of longitudinally located aluminum-polymer tape.

A tinned copper contact wire with a nominal diameter of at least 0.4 mm is laid under the screen.

The core is formed by fours twisted by concentric coils.

The nominal number of fours in the cables can be - 4, 7.

Conducting single-wire cores are made of soft copper wire.

The insulation of these cores is made of three layers. The first and third layers are made of solid polyethylene, the second layer is made of porous. The total insulation thickness of conductive wires reaches a value of at least 1.0 mm. It is preferable that the nominal diameter of the conductive core be 1.2 mm, and the twisting steps of the insulated conductors in different fours are different and should be at least 300 mm.

In the attached drawing, the cable is shown in section. Film-porous-film insulation (2) consisting of three layers is superimposed on single-wire conductive conductors (1). Four insulated cores are twisted into a four (3) around a central filler made of polystyrene filament (4). A twisted four is wrapped in an open spiral with a distinctive synthetic ribbon or thread (5). Fours are twisted into the core of the cable, on which a belt insulation of polymer tapes is applied (6). At the same time, a longitudinal screen of aluminum-polymer tape with overlapping (7) and a sheath of polyethylene (8) are simultaneously applied over the waist insulation. A tinned copper contact wire (9) is laid along the screen.

All materials used in the manufacture of cables comply with the approved regulatory and technical documentation for them.

The twisting steps of insulated cores in different fours vary and must be at least 300 mm.

An example of a high-frequency communication cable.

The cable has a core that is twisted in concentric layers of 4 twisted together single-wire conductive conductors. Belt insulation is applied over the core and consists of polymer tapes. On top of the belt insulation is a screen made of aluminum-polymer tape, placed longitudinally. A tinned copper contact wire with a nominal diameter of at least 0.4 mm is laid under the screen. The next layer is the shell, which consists of a halogen-free polymer composition.

The protective cover is made of armor, consisting of two steel galvanized tapes and a protective hose made of a halogen-free polymer composition.

Conductors made of copper soft wire made of wire rod according to GOST R 53803-2010. The nominal diameter of the conductive core is 1.2 mm. The cores must not have burrs, cutting edges, breaks, leading to damage to the insulation. Conductors are insulated with three layers of polyethylene:

- a layer of continuous polyethylene brand LE 8706;

- a layer of porous polyethylene brand HE 4873;

- a layer of continuous polyethylene brand HE 3366. The total insulation thickness is 1.1 mm. The insulation should not have gaps, impurities and inclusions, on the outer surface of the insulation should not be dents, sag and thickenings. The insulation must be airtight.

The four are twisted by a star, while two veins located diagonally form a working pair.

Twisting step - 300 mm. Isolation of the veins of the first pair of four - red and yellow (or natural) colors, the second pair - blue and green.

The twisted four is wrapped in an open spiral with a distinctive synthetic ribbon or thread. The colors of ribbons and threads (distinctive elements) of all fours should be different for fours with different twisting steps. The bright colors of the insulation of the conductors and the distinctive colors of all fours in the cable are used to ensure compliance with electrical safety requirements and facilitate the installation of the cable.

Claims (6)

1. High-frequency cable for digital networks, having: a conductive core consisting of copper single-wire insulated conductors twisted into fours, which, in turn, are twisted together; on top of the core is a belt insulation and a sheath of polyethylene, where the insulation of the conductive wires is made of three layers - the outer and inner layers of solid polyethylene, the middle layer is made of porous polyethylene, characterized in that the total insulation thickness of the conductive wires reaches at least 1.0 mm . 2. The cable according to claim 1, characterized in that a shield of aluminum-polyethylene tape is laid over the belt insulation and a tinned copper contact wire with a diameter of at least 0.4 mm is laid along the screen. 3. The cable according to claim 1, characterized in that the nominal diameter of the conductive core is 1.2 mm. 4. The cable according to claim 1, characterized in that the steps of twisting the insulated conductors in different quadruples differ and must be at least 300 mm. 5. The cable according to claim 1, characterized in that in the cable the nominal number of twisted fours is 4. 6. The cable according to claim 1, characterized in that in the cable the nominal number of twisted fours is 7.

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