RU2735943C1 - Symmetrical four-pair cable with film-microtubular, microtubular perforated and nanokordel insulation - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used in makeups of symmetric communication cables within a shared network or structured cable systems. Disclosed is a cable comprising strands in film-polymer insulation, twisted into pairs with different strands of twisting in a common layer with an outer polymer shell, wherein insulation of each core is made in the form of microtubes and perforated microtubes of equal size throughout the entire section of each core, note here that after every microtubes there introduced is nano-kordel along the whole length of each conductor of symmetrical cable, and external film is in contact with microtubular insulation of each core along the entire cross-section of every conductor along the whole length of symmetrical cable.

EFFECT: technical result is reduction of relative dielectric permeability of cable strands insulation; as a result, attenuation coefficient decreases due to reduction of losses in insulation of conductors, capacitive and inductive components of influence between conductors.

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Description

The invention relates to the field of electrical engineering and can be used in the construction of symmetrical communication cables for public networks and structured cable systems.

In communication cables on public communication networks and structured cabling systems, depending on the category, various types of core insulation are used. For category 1 cables, polyethylene with a relative dielectric constant of 2.3 is used as core insulation; for category 3 cables, a dielectric material is used to insulate the cores with a relative dielectric constant of 2.1; for cables of category 5e, cellular polyethylene with a sheath is used as core insulation - film-porous polyethylene with a relative dielectric constant of 2.0; For cables of category 6 and 6a, Teflon core insulation with a relative dielectric constant of 2.0 is used.

The known design of a four-pair cable containing copper conductors in dielectric insulation, twisted in pairs with different pitch, in a common outer dielectric sheath (book "Structured cable systems" authors: AB Semenov, SK Strizhakov, I.R. Suncheley, DMK Publishing House, M., 2002, 4th edition, p. 109, Fig. 3.4 and 3.5). The disadvantage of this design is the rather high value of the relative dielectric constant of the cable core insulation.

The known design of a four-pair cable, consisting of two quadruples, twisted from two pairs each quadruple, with a film-porous insulation of the cores and an outer polymer sheath (p. 106, Fig. 3.2b of the above book). The disadvantage of this design is also the high value of the relative dielectric constant of the core insulation.

The closest in technical essence is the construction of a four-pair cable, described in the brochure of Teldor, Wires and Cables, Russia Ltd. 2006, 223 pp., P. 35 (cam-: www.teldor.com.). The cable consists of four unshielded twisted (twisted) pairs, twisted together, protected by a PVC sheath for internal fixed installation; core diameter 0.51 mm, polyolefin insulation (film-porous film insulation, outer diameter of insulated core 0.9 mm; outer cable diameter 5.0 mm. Considering the maximum signal propagation speed equal to 0.7 times the speed of light, the relative dielectric constant the core insulation is 2.0, which is also the main disadvantage of this cable.

The technical result, which the proposed invention is aimed at, is to create such a structure of a symmetrical four-pair cable, which makes it possible to reduce the relative dielectric constant of the cable core insulation, to reduce the capacitance of the pairs and, therefore, the dielectric losses and the capacitive component of the influence between pairs.

To achieve the technical result, a four-pair cable containing conductors in film-polymer insulation, twisted into pairs with different twisting steps into a common layer, with an outer polymer sheath, the insulation of each core is made in the form of microtubes and perforated microtubes of the same size throughout the entire section of each core, and after each micropipe, a nanocord is introduced along the entire cross-section of the core along the entire length of the symmetrical cable, and the outer film directly contacts the microtubular insulation of each core along the entire cross-section of each core along the entire length of the symmetrical cable.

The device is illustrated by drawings. FIG. 1 shows the design of a symmetrical four-pair cable with film-microtubular and nano-cord insulation of cores. It contains: symmetrical pairs 1, cores 2, microtubular insulation of core 3, microtubular perforated 4 nano-cord insulation 5 of core, outer film 6 of core insulation, in contact with microtubular insulation 3 and 4, outer polymer sheath 7 of the cable.

FIG. 2 shows an enlarged design of an insulated core of a symmetric cable with film-microtubular and microtubular perforated and nano-cord insulation of cores. It contains core 2, nanocord 5, micropipes 3 and perforated micropipes 4 over the entire section of core 2, an outer insulation film 6 in contact with micropipes 3 and 4 along the entire section of core 2 along the entire length of the symmetrical cable.

In the design of a symmetric cable with film-microtubular and microtubular perforated and nanocordial insulation of cores due to the fact that the insulation of each core is made in the form of microtubes and perforated microtubes along the entire section of each core, and after each microtube, a nanocorrel is introduced along the entire section of each core, and the outer film, in contact with the microtubular insulation of each core over the entire cross section of each core along the entire length of the symmetrical cable, the relative dielectric constant of the insulation of the cores is significantly reduced due to micropipes, the interior of which is filled with air with a relative dielectric constant of 1. Depending on the number and size of micropipes and the number and the size of the nanocordel, it is possible to change the relative permittivity in a fairly wide range, decreasing the thickness of the insulation and reducing the loss in the dielectric. Since the dielectric constant of the dielectric material is 2.3, taking into account the film-microtubular insulation and the inserted nanocord and contacting the veins in the volume of 90% of the total volume of the conductor insulation, we obtain the relative dielectric constant of the entire conductor insulation equal to 1.85.

In addition to the main technical result, a decrease in the attenuation coefficient is achieved by reducing losses in the insulation of conductors, as well as the capacitive component of the effect between pairs. By reducing the thickness of the insulation and, therefore, the distance between the conductors in a pair, the inductance of the circuit also decreases.

Claims (1)

Symmetrical four-pair cable containing conductors in film-polymer insulation, twisted in pairs with different twisting pitches into a common layer with an outer polymer sheath, characterized in that the insulation of each core is made in the form of microtubes and perforated microtubes of the same size along the entire cross-section of each core, and after each micropipe, a nanocord is introduced along the entire length of each core of the symmetrical cable, and the outer film contacts the microtubular insulation of each core along the entire cross section of each core along the entire length of the symmetrical cable.

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