RU136913U1 - SELF-SUPPORTING WIRE ISOLATED AND PROTECTED - Google Patents

Abstract

1. The wire is self-supporting, insulated and protected for overhead power lines, containing a conductive core with a central power element, a cable or module with optical fibers, a water blocking tape or without it, and an outer polymer sheath, characterized in that the cable or module with optical fibers is moved outside the outer polymer sheath of the wire and is connected with it by twisting around an insulated conductive core, and the conductive core is sealed. 2. A self-supporting insulated wire and protected for overhead power transmission lines according to claim 1, characterized in that it further comprises an insulated zero load-bearing sealed core and one or more isolated conductive sealed wires connected to an optical cable or a twisting module around the zero load-bearing core. The self-supporting wire insulated and protected for overhead power transmission lines according to claim 1, characterized in that as the central power element of the conductive core it contains a plastically crimped core of steel wires with a corrosion-resistant metal coating.

Description

The utility model relates to electrical engineering, namely to the design of combined self-supporting insulated wires (SIP) for a nominal voltage of 0.6 / 1 kV and combined self-supporting protected wires for a nominal voltage of 20 and 35 kV for overhead power lines and fiber-optic transmission lines for telecommunication signals .

Self-supporting and protected wires for overhead power transmission lines according to TU 16-705.500-2006, year of entry 2006, Russia are known from the prior art. Self-supporting insulated wires SIP-2 according to specifications contain insulated main (phase) conductive conductors and an isolated zero load-bearing reinforced core. The self-supporting protected wire SIP-3 according to technical specifications contains one insulated conductive hardened core. In accordance with the technical conditions, stranded wires SIP-2 can also contain insulated auxiliary wires of lighting and control.

Existing SIP wires according to TU 16-705.500-2006 are used only for transmission and distribution of electrical energy. This disadvantage narrows the scope of self-supporting insulated and protected wires.

Also known is a combined wire with a fiber optic module based on the self-supporting protected wire SIP-3 (prototype), described in the "Cables" product catalog Optical Cables "dated 21.12.2009 on the website www.energokables.ru New Cable Systems LLC, Russia. This combined wire is designed to transmit and distribute electric energy and light telecommunication signals by hanging it on the supports of overhead power lines. The prototype wire for a nominal voltage of 20 and 35 kV (Fig. 1) contains a conductive core with a central power element 1 made of steel wire or aluminum alloy wire, and round aluminum wires 2, a cable or module 3 with optical fibers, a water blocking tape 4 or without it and the outer shell 5 of cross-linked polyethylene. The aluminum wires and the optical cable or module have the same diameter and are twisted together around the central power element of the conductive core of the wire. Due to restrictions on the diameter and weight of the combined wire according to the prototype, the number of optical fibers in the optical cable or module is limited to 24, and the cross section of the conductive core is up to 150 mm. Accordingly, this wire has significant limitations on the load current and the transmission of light telecommunication signals. The service life of the wire is 20 years.

The prototype wire has the following disadvantages:

- high tensile loads on the optical cable or module;

- low current throughput;

- low bandwidth for telecommunication signals;

- low carrying capacity;

- increased stretch and sag;

- increased damage to the optical cable or module at the points of attachment of the wire with the fittings during installation and during operation;

- increased complexity and complexity of installation and repair of wires on the poles of power lines;

- the complexity and high cost of reinforcement;

- low performance;

- low reliability;

- low service life.

All these disadvantages of the prototype reduce the quality, reliability and durability of the combined wires of SIP.

The prototype wire was developed at OJSC Sevcable, Russia, as an experimental version of the optical cable, but due to the above-mentioned drawbacks, it was not found practical application and is not commercially available.

The technical task of the utility model is to increase the operational characteristics, manufacturability, reliability and service life of the combined wires of self-supporting insulated wires.

The technical result is achieved by the fact that the cable or module with optical fibers is taken outside the outer polymer sheath of the wire and connected to it by twisting around an insulated conductive core, and the conductive core is sealed.

A common feature of the prototype and the proposed technical solution is the presence of a conductive core with a central power element, a cable or module with optical fibers, a water-blocking tape or without it and an outer polymer sheath. At the same time, the proposed wire differs from the known one in that the cable or module with optical fibers is carried outside the outer polymer sheath of the wire and connected to it by twisting around an insulated conductive core, and the conductive core is sealed.

The reasons that impede the receipt of this technical result in the specified prototype:

1. The presence of a common outer polymer shell combined wire.

2. Lack of direct access to the optical cable or module.

3. Joint twisting of an optical cable or module with aluminum wires of a conductive core.

4. Direct contact between the aluminum wires of the conductive core heated to 90 ° C during operation of the wire and the optical cable or module.

5. The direct dependence of the tensile load of the optical cable or module on the temperature extension and the mechanical tensile load of the conductive core of the wire.

6. Limitations on the diameter and weight of the combination wire.

7. Restrictions on the diameter of the optical cable or module, aluminum wires and the central power element of the conductive core of the wire.

8. The inability to seal the conductive core of the wire.

Advantages of the new SIP wire:

- increased operational characteristics;

- the absence of restrictions on the diameter of the optical cable or module and the number of optical fibers;

- the absence of restrictions on the diameter of aluminum wires and the central power element, as well as on the cross section of the conductive core;

- high current throughput;

- high bandwidth for light telecommunication signals;

- lack of temperature effects of the conductive core on the optical cable or module;

- lack of temperature and mechanical tensile load on the optical cable or module;

- the absence of mechanical effects on the insulation of the optical cable or module from biting clamps;

- reducing the diameter and mass of the conductive core due to its compaction and reducing the mass of the outer polymer shell;

- high carrying capacity;

- low extensibility and small sag;

- increased flexibility;

- high technology and maintainability;

- direct access to the optical cable or module without destroying the outer polymer sheath of the conductive core and the possibility of its maintenance and repair on the line;

- the possibility of using standard tensile and supporting clamps;

- high reliability and durability.

The design of the new SIP wire is shown in FIG. 2 and FIG. 3. The self-supporting protected wire SIP-3 for a nominal voltage of 20 and 35 kV with an optical cable or module (Fig. 2) contains an insulated sealed conductive core 1 of aluminum or aluminum alloy, the central power element of the core 2 of aluminum alloy or steel, and a cable or module 3 with optical fibers. Self-supporting insulated wire SIP-2 for a rated voltage of 0.6 / 1 kV with an optical cable or module (Fig. 3) contains one or more main (phase) aluminum sealed conductive conductors 1 with insulation 2 made of cross-linked or thermoplastic polyethylene, one insulated zero the supporting core 3 of aluminum or aluminum alloy, the central power element of the supporting core 4 of aluminum alloy or steel, and a cable or module 5 with optical fibers. Additionally, the SIP-2 wire can be equipped with auxiliary wires for lighting and control. The new SIP wire is made according to the following technology. The main conductors (CLE) of the SIP-2 wire are twisted on a torsion machine from one or more concentric coils of round aluminum wires in a spiral in alternating directions with a certain twisting pitch. In this case, one wire is placed in the center of the wire. The last twist of the wires should have the right direction of torsion. During twisting, the conductors are sealed with crimp rollers with a fill factor of 0.94-0.96. When the cores are sealed, their diameter decreases and the wire's operating characteristics increase. On top of the cores, insulation of a certain thickness is applied from light-stabilized cross-linked polyethylene or light-stabilized thermoplastic polyethylene. Core insulation is carried out on an extrusion line of the type Rosendahl, Austria, at a speed of (50-60) m / min. The zero core (NJ) of the SIP-2 wire at a rated voltage of 0.6 / 1 kV and the conductive core of the SIP-3 wire at a rated voltage of 20 and 35 kV are made using the same technology from aluminum wires or aluminum alloy wires. These cores are reinforced with a central power element made of aluminum alloy or steel. A cable or module with optical fibers is twisted around the zero core core along with the main and auxiliary conductors of the SIP-2 wire or around the conductive core of the SIP-3 wire with a certain twisting pitch. The stranding of cores with an optical cable or module should be in the right direction. The finished wire is tested in accordance with GOST R 52373-2005, year of entry 2006, Russia, and TU 3587-001-88083123-2010, year of entry 2010, Russia.

Restrictions on the choice of the design and material of the central power element of the conductive and supporting conductors of the SIP wires are imposed by the operating conditions of the wires:

- ambient temperature from + 50 ° C to -50 ° C;

- operating core temperature up to 90 ° C;

- humidity up to 100%;

- high wind loads (maximum wind speed up to 30 m / s and more);

- heavy snowfall, icing and rain;

- increased solar radiation;

- multiple mounting bends;

- restrictions on the maximum load on the wire.

To a large extent, these conditions are satisfied by self-supporting insulated wires with carrier and conductive cores, reinforced with a steel central power element, providing maximum strength and minimum tension of the wire. In order to increase the flexibility, strength and manufacturability of SIP wires, the authors of the utility model proposed the construction of a new wire with cores reinforced with a plastically crimped core made of steel wires with a corrosion-resistant metal coating. Plastic compression of a steel multi-wire core is carried out by cold rolling using special carbide rollers. As a result of such compression, the cross-sections of round wires accept mutually conjugated shaped profiles. Linear contact between the wires develops in strip. The contact area increases and contact pressures decrease, the gaps between the wires are filled, and the structural stability of the core increases. The core becomes smoother and the shape rounded. At the same time, the core diameter decreases by 10-15%, its strength increases by 5-10%, flexibility, wear resistance, reliability and durability.

For the manufacture of plastically pressed steel multi-wire core, any round carbon steel wire with a corrosion-resistant metal coating can be used. As a corrosion-resistant coating, zinc, aluminum, an alloy of aluminum with zinc can be used. In Russia, the most common is galvanized steel wire. In this regard, the authors of the utility model developed a plastically crimped POSs core according to TU 3511-034-50289046-2010 from round galvanized steel wires according to GOST 9850-72, year of entry 1974. In order to reduce inter-wire gaps, the diameter of the wires in the core can be different. Galvanized steel wire is made of high-quality carbon structural steel according to GOST 1050-88, year of commissioning 1991, or carbon steel according to GOST 14959-79, year of commissioning 1981, or of wire rod according to OST 14-15-37-85, year of commissioning 1987. The steel wire rod is subjected to cold drawing (drawing) in several passes in special mills. To give the wire ductility, after a certain number of passes, it is subjected to thermochemical treatment (patenting) while maintaining high mechanical characteristics. Zinc or aluminum coating of a certain thickness is applied to the steel wire by thermal spraying, which provides strong adhesion (adhesion) of the coating to the steel wire.

Self-supporting insulated and protected SIP wires with optical cable, developed by the authors of the utility model, have passed comprehensive tests at cable plants in the Russian Federation with positive results. The service life of new wires is 30 years.

Claims (3)

1. The wire is self-supporting, insulated and protected for overhead power lines, containing a conductive core with a central power element, a cable or module with optical fibers, a water blocking tape or without it, and an outer polymer sheath, characterized in that the cable or module with optical fibers is moved outside the outer polymer sheath of the wire and is connected with it by twisting around an insulated conductive core, and the conductive core is sealed. 2. The self-supporting insulated wire and protected for overhead power transmission lines according to claim 1, characterized in that it further comprises an insulated zero load-bearing sealed core and one or more insulated conductive packed wires connected to an optical cable or twist module around the zero load-bearing core. 3. The self-supporting wire insulated and protected for overhead power transmission lines according to claim 1, characterized in that as the central power element of the conductive core, it contains a plastically crimped core of steel wires with a corrosion-resistant metal coating.

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