RU168542U1 - LOW-FREQUENCY COMMUNICATION CABLE WITH CORDELL-PAPER INSULATION - Google Patents

Abstract

Communication cable low-frequency, symmetrical, homogeneous, with copper conductive wires twisted into fours, with paper-cord insulation provides improved quality and range of communication over cables due to the fact that the parameters of the structural elements of the claimed cable have changed: - the step of winding the conductive core with paper cordel is in the range from 4 to 6 mm; - the pitch of the winding of the conductive core with paper tape is in the range from 16 to 24 mm; - the nominal diameter of the paper core used for the manufacture of communication cables with a diameter of a conductive core of 0.9 mm, is 0.3 mm. At the same time, an increase in the quality and range of communication through cables was achieved by reducing the electrical capacitance of the circuits and, accordingly, the attenuation of the signal (reducing the capacitance to 5%; reducing the attenuation coefficient to 10%) .

Description

The utility model relates to communication cables with paper-cord insulation, namely, to low-frequency multi-channel telecommunication cables of ATS and MTS. Cables can be used for trunk lines that transmit signals with frequencies in the range up to 552 kHz (for transmitting up to 120 channels of tone frequency). Operating voltage of cable circuits:

- up to 430 V - direct current,

- up to 300 V - alternating current.

From the reference N.I. Belorussov, A.E. Sargsyan, A.I. Yakovleva, "Electric wires and cords", publishing house "Energy" M., 1979 known low-frequency communication cables with paper-cord insulation (hereinafter referred to as cable) in a lead sheath.

The closest cables for essential features that can be taken as analogues: cables of the TZG, TZB and TZBG brands.

The site http://ooocable.ru/tzg-tzbg-tzbl-tzblg/ has the following information about these cables:

1. Copper single-wire conductive core with a diameter of 0.9 or 1.2 mm.

2. Cord paper insulation.

3. Twisted star quartet (group).

4. The core, twisted concentric midi from groups.

5. The belt insulation is made of two paper tapes superimposed overlapping.

Cables like TZG have a protective cover like BG:

- a cushion of crepe paper or non-woven fabric and bitumen;

- armor from two steel strips coated with bitumen and chalk solution.

Cables of type TZB have a protective cover of type B: a pillow of crepe paper or non-woven fabric and bitumen; armor from two steel tapes; outer cover of glass, bitumen and chalk solution.

Cables of type TZBG have a protective cover of type BG: a pillow made of crepe paper or non-woven fabric and bitumen; armor from two steel strips coated with bitumen and chalk solution.

The disadvantage of these cables is the rather high electrical capacitance of the circuits and, as a result, the high attenuation coefficient.

The technical result from the use of the proposed technical solution is to improve the quality and range of communication over cables by reducing the electrical capacitance of the circuits and, accordingly, the attenuation of the signal (decrease in capacitance to 5%; decrease in attenuation coefficient to 10%).

These technical characteristics of the cable, in comparison with the analogue, have improved due to the fact that the parameters of the structural elements of the claimed cable have changed:

- the pitch of the winding of the conductive core with paper cordell is in the range from 4 to 6 mm;

- the pitch of the winding of the conductive core with paper tape is in the range from 16 to 24 mm;

- the nominal diameter of the paper core used for the manufacture of communication cables with a conductive core diameter of 0.9 mm is 0.3 mm.

At the same time, a stable design of insulated cores and their stable geometric dimensions are ensured.

Description of the claimed technical solution for the cable.

Communication cable low-frequency, symmetrical, homogeneous is made of copper conductive cores with paper-cord insulation, twisted into fours. In this case, for conductive conductors with a diameter of 0.9 mm, the nominal diameter of the paper core is 0.3 mm, the pitch of the paper cordell wrapping is in the range of 4 to 6 mm, the pitch of the wrapping of the conductive core in paper tape is in the range of 16 to 24 mm.

In the cable, a lead sheath may be applied over the paper tape.

The shell may be made of antimony lead.

The Figure shows an image of the inventive cable.

1 - copper single-wire conductive core;

2 - paper-cord insulation formed by a paper cordell superimposed on a core in a helical spiral and a paper tape wrapped in one layer with overlapping;

3 - star fours;

4 - belt insulation;

5 - lead sheath.

An example of a cable.

Communication cable low-frequency, symmetrical, homogeneous is made of copper conductive cores with paper-cord insulation, twisted into fours. In this case, for conductive conductors with a diameter of 0.9 mm, the nominal diameter of the paper core is 0.3 mm, the pitch of the paper cordell wrapping is in the range of 4 to 6 mm, the pitch of the wrapping of the conductive core in paper tape is in the range of 16 to 24 mm.

Isolated veins are twisted into star quads, which, in turn, are twisted into a core. The number of fours in these cables can be from 3 to 61.

On a twisted four, colored cotton or synthetic yarn or paper tape is laid with an open spiral.

The core of the cable is twisted from star quadruples in concentric coils with a pitch of not more than 30 diameters in a twist.

The core has a belt insulation of paper tapes superimposed overlapping.

A lead sheath of antimony lead is imposed on top of the waist insulation.

Claims (3)

1. Communication cable low-frequency, symmetrical, homogeneous, with copper conductive conductors twisted into fours, with paper-cord insulation, characterized in that for conductive conductors with a diameter of 0.9 mm, the nominal diameter of the paper core is 0.3 mm, the pitch of the conductive winding the core with a paper cord is in the range from 4 to 6 mm, the pitch of the winding of the conductive core with paper tape is in the range from 16 to 24 mm. 2. The cable according to claim 1, characterized in that a lead sheath is applied over the paper tape. 3. The cable according to claim 2, characterized in that the sheath is made of antimony lead.

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