RU200872U1 - Field cable - Google Patents

Abstract

The utility model relates to field cables. The cable contains working insulated conductive conductors 1, an outer sheath 12 and a load-carrying element 10 made of synthetic threads. Veins 1 are twisted in pairs, while the twisting steps of different pairs are different and differ by at least 20%. EFFECT: increased noise immunity. 1 wp f-ly.

Description

The technical field to which the utility model belongs

The utility model relates to cable technology, in particular to reusable field cables.

State of the art

A field cable is known from the prior art, which has working and service insulated conductive cores, as well as an outer insulating and protective sheath and a load-carrying element made of synthetic high-strength threads (RF patent for utility model No. 139699, published on 20.04.2014). This cable does not meet the requirements of real operation in terms of noise immunity parameters.

The essence of the utility model

The technical problem being solved is to increase the reliability of high-speed information transmission over field cables.

The technical result consists in increasing the noise immunity of cables from the mutual electromagnetic influence of the working circuits of the cable.

The specified technical result is achieved by the fact that the field cable contains working insulated conductive conductors, an outer sheath and a load-carrying element made of synthetic threads, the mentioned working insulated conductive conductors contain seven copper wires and are twisted into pairs, while the twisting steps of different pairs differ by no less than by 20%.

The specified technical result is also achieved by the fact that the paired strands are equipped with a screen made in the form of a braid or a winding of wires or tapes.

A distinctive feature of this utility model is the execution of pairs of conductive conductors with different twisting pitch in different pairs, with each conductor containing seven copper wires.

List of drawing figures

FIG. 1 shows a cross-section of a cable.

Implementation of the utility model

The field cable in accordance with this utility model contains working insulated conductive conductors 1, an outer sheath 10 and a load-carrying element 5 made of synthetic threads. The cable can contain from two to 10 working conductors.

Conducting conductors 1 are twisted into pairs 3. The number of pairs in the cable can be from one to five. The steps of twisting different pairs of 3 working conductors 1 are performed differently. It is advisable that the twisting steps of the pairs differ by at least 20%.

Depending on the operating conditions and functional features, the field cable may additionally contain: shield 2, one or more service cores 7, inner sheath 9, contact wire 4. For the purpose of identifying the manufacturer, the field cable may contain an identification thread 8 of color identification.

Depending on the design, the field cable may contain a fastening winding 6. Screen 2 is made of aluminum foil, and winding 6 can be made of polyethylene terephthalate (PET).

Depending on the version, the structural interconnection of the elements of the field cable can be as follows. Insulated working conductor of 1 cable is twisted from seven copper wires. Working conductors 1 are twisted in pairs into pairs 3 and placed under the screen 2, made in the form of a braid of tapes. On top of the screen 2, the service veins 7 and the identification thread 11 of the manufacturer are placed. A contact wire 4 is laid under the shield 2, providing additional electrical contact between the tapes of the shield 2. For the technological fastening of the cable structure elements and their additional insulation, a fastening winding is used 6. All elements of the cable structure can be placed under the inner insulating and protective sheath 9. Place braid or wrapping made of synthetic high-strength threads that form the load-carrying element 5. The threads of the load-carrying element can be fixed with a fastening element (for example, a winding). The entire cable structure is protected by an outer sheath 10 (protective hose).

Examples of the implementation of the utility model.

Example 1:

The field cable contains four pairs of working insulated conductive conductors 1. The outer sheath 10 is made of polyvinyl chloride. The load-carrying element 5 is made of CBM threads. Twisting steps in four pairs: 80 mm, 100 mm, 120 mm and 140 mm.

Example 2:

The field cable contains four working insulated conductive conductors 1. The outer sheath 10 is made of polyvinyl chloride. The load-carrying element 5 is made of CBM threads. The twist pitch in a pair is 1 - 140 mm. The twist pitch in a pair is 2 - 90 mm.

The device works as follows.

When passing through the AC cable, the working cores 1 create an induced electromagnetic field around them, which affects the adjacent cores. In the case of twisting the working cores into pairs 3 with the same pitch, the induced electromagnetic fields amplify each other and the level of interference increases sharply.

Twisting pairs of cables 3 with different pitch leads to the fact that the electromagnetic fields induced by the working cores 1 have different characteristics and compensate each other. Providing a difference in the twisting steps, it is possible to significantly increase the noise immunity of the cable from mutual influences.

The experimental work carried out has confirmed the effectiveness of the proposed technical solutions. In a prototype cable made in accordance with this description, the noise immunity was higher than in similar cables, but with a quadruple twisted cores.

Claims (2)

1. A field cable containing working insulated conductive conductors, an outer sheath and a load-carrying element made of synthetic threads, the mentioned working insulated conductive conductors contain seven copper wires and are twisted into pairs, while the twisting steps of different pairs differ by at least 20%. 2. A cable according to claim 1, characterized in that the paired strands are equipped with a screen made in the form of a braid or a winding of wires or tapes.

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