RU53068U1 - Self-supporting insulated wire - Google Patents

Abstract

The utility model relates to cable technology, namely to self-supporting insulated wires. The wire contains a compacted multi-wire zero core of aluminum alloy, around which multi-wire compacted aluminum phase conductive wires are twisted, each of which is coated with insulation from a thermoplastic or cross-linked polyethylene composition containing 2.5-4.0 wt.% Carbon black, with an oxygen index of less than 26%. The zero core can be either insulated or non-insulated. In the inner space of the zero and phase conductive conductors, as well as under the insulation, a water-blocking element in the form of a powder and / or thread and / or tape can be located.

The technical result is the provision of incombustibility and water resistance of the wire.

Description

The utility model relates to cable technology, namely to self-supporting insulated wires, designed for use in air power and lighting networks for alternating voltage up to 0.6 / 1 kV with a nominal frequency of 50 Hz.

Known self-supporting insulated wire containing a sealed multi-wire zero core of aluminum alloy and stranded around it multi-wire sealed aluminum phase conductive wires with plastic insulation made of light-stabilized polyethylene (Self-supporting insulated wires of the type "AURORA TU 16.K71-268-98).

This technical solution is the closest to the proposed combination of features.

The disadvantages of the known wire should include its low resistance to fire.

The task was to develop a design of a self-supporting insulated wire with a high degree of incombustibility and water resistance while high resistance to ultraviolet radiation and ozone.

The technical result is achieved by the fact that in a self-supporting insulated wire containing a sealed multi-wire zero core of aluminum alloy and multi-wire sealed aluminum phase conductive wires twisted around it, each of which is coated with plastic insulation, the insulation of zero and phase conductors is made of thermoplastic or cross-linked polyethylene

composition containing 2.5-4.0 wt.% carbon black and having an oxygen index of at least 26%.

The wire may also contain a water blocking element made in the form of a powder and / or thread and / or tape and located in the inner space and under the insulation of the zero and each phase conductive veins.

The water-blocking element can be laid, in particular, in the conductive core along the central wire, for example, in the form of a thread, and over the zero and conductive core, for example, in the form of a tape, moreover, a water-blocking material in the form of powder can be applied to the surface of the thread and tape.

The zero core can be coated with plastic insulation made of a thermoplastic or cross-linked polyethylene composition containing 2.5-4.0 wt.% Carbon black and having an oxygen index of at least 26%.

A water blocking element made in the form of powder and / or thread and / or tape may also be contained in the interior space and under the insulation of the zero core.

The utility model is illustrated in the drawing, which shows a wire in section.

The wire contains a zero core 1, coated with insulation 2, phase conductive conductors 3, with insulation 4, a water blocking element 5.

The following is evidence of the industrial applicability of the utility model.

In the manufacture of wires used well-known materials manufactured in industry in accordance with the regulatory documentation for them.

The water-blocking elements used in cable technology are made, in particular, from non-woven materials capable of water absorption or organic materials that swell in water.

The use of the proposed materials does not make any fundamental changes to the traditional manufacturing technology of self-supporting insulated wires, which consists in the following:

The manufacture of the zero core 1 and phase conductive conductors 3 is carried out by applying a few coils of round wire on top of the central. The core is sealed by crimping it using special rollers. In the manufacture of the zero core 1 and phase conductive conductors 3, water-blocking elements 5 can be introduced into them. The insulation 4 is applied to the phase conductive conductors 3 using conventional extrusion equipment. Similarly, insulation 2 is applied to the zero core 1. Before insulation 2 and 4 are applied to the surface of the supporting core 1 and phase conductive wires 3, respectively, water-blocking elements can be applied 5. Twist the isolated phase conductive conductors 3 around the isolated zero core 1 by twisting machines lantern type.

If necessary, crosslinking of the polyethylene composition is carried out by silicon with organic compounds or peroxides (chemical crosslinking) or by irradiation with a stream of accelerated electrons on standard equipment designed for this purpose.

Samples of the proposed wire and insulation of zero and phase conductors containing carbon black in the claimed range of values were tested.

Tests have shown that the proposed wire design ensures compliance with the requirements of the Electrical Installation Rules. Chapter 2.4. Overhead power lines with voltage up to 1 kV. Seventh Edition. - M.: CJSC Energoservice, 2003. - 421 p.

The use of carbon black in the insulation material in dosages that go beyond the stated limits leads to a decrease in the mechanical characteristics of the wire.

The technical result is the provision of incombustibility and water resistance of the wire.

Claims (4)

1. A self-supporting wire containing a compacted multi-wire zero core of aluminum alloy and multi-wire compacted aluminum phase conductive wires twisted around it, each of which is coated with plastic insulation from a thermoplastic or cross-linked polyethylene composition, characterized in that a composition containing 2 is selected as insulation 5-4.0 wt.% Carbon black and having an oxygen index of at least 26%. 2. The wire according to claim 1, characterized in that it contains a water blocking element made in the form of a powder and / or thread and / or tape and located in the inner space and under the insulation of each phase conductive core. 3. The wire according to claim 1 or 2, characterized in that the zero core is coated with insulation made of a thermoplastic or cross-linked polyethylene composition containing 2.5-4.0 wt.% Carbon black and having an oxygen index of at least 26%. 4. The wire according to claim 3, characterized in that it contains a water blocking element made in the form of powder and / or thread and / or tape and located in the inner space and under the insulation of the zero core.