RU195761U1 - 64/110 KV ELECTRIC TRANSMISSION WIRES - Google Patents

Abstract

The invention relates to cable technology, namely, to the construction of wires with protective insulation intended for overhead power lines with voltage up to 110 kV and a frequency of 50 Hz. A wire for overhead power lines containing a conductive core twisted from aluminum alloy wires, a shield made of conductive polymer composition, isolation from a crosslinked polymer composition and an outer shell of a polymer composition, characterized in that the conductive core is twisted using water-blocking threads, and olyatsiya made of crosslinked polyethylene composition with an oxygen index of not less than 32%.

Description

The technical field to which the utility model relates.

The utility model relates to cable technology, namely to the construction of wires with protective insulation, designed for overhead power lines with voltage up to 110 kV and frequency of 50 Hz.

State of the art

Known is a sheathed wire for overhead power lines, consisting of a core on which one or several coils of wires, a semiconducting screen, insulation and an external protective sheath are superimposed, the core is either a composite material or high-strength metal, and all coils are transformed wires tightly filling the entire space around the core are made of electrotechnical pure aluminum. The insulation of the wire is made of peroxide-cross-linked polyethylene, the sheath is made of weather-resistant tracking-resistant polyethylene. (Patent RU 117703, published June 27, 2012, bull. No. 18).

Signs of a known cable that are common with the features of the claimed utility model are that the wire contains a conductive core, a semiconducting screen, insulation from a crosslinkable polymer composition and a sheath of a polymer composition.

The closest analogue (prototype) is a wire with protective insulation for overhead power lines at a rated voltage of 110 kV, including a multi-wire sealed twisted in several types of conductive core, over which a shield of conductive polyethylene is applied, insulation is made of cross-linked polyethylene and the outer shell, and the outer shell made of weather-resistant tracking-resistant polyethylene (patent RU 107388, published on 08/10/2011, bull. No. 22).

Signs of the known cable, which are common with the features of the claimed utility model, are that the wire contains a conductive core made of aluminum alloy wires, a semiconducting screen, insulation from a crosslinkable polymer composition and a sheath of polymer composition.

The disadvantage of the prototype is the use of insulation and sheathing materials that do not meet the requirements for the non-proliferation of burning wire, as well as the lack of sealing of the wire core.

The technical problem is the need to develop a wire for overhead power lines at a voltage of 64/110 kV, which does not spread combustion and is resistant to moisture.

Utility Model Disclosure

The technical result is achieved by the fact that the conductive core is twisted with the use of water-blocking threads, winding of an electrically conductive water-blocking tape can also be applied over the conductive core, and the insulation is made of silane-crosslinked polyethylene with an oxygen index of at least 32%.

The use of water-blocking threads when twisting a conductive core ensures its sealing, thus, it does not allow liquid carriers to penetrate into the core from the external environment, affecting the possibility and quality of power transmission. The use of silane-crosslinked polyethylene with an oxygen index of at least 32% ensures non-proliferation of combustion.

The proposed design of the wire has greater reliability during operation.

Utility Model Implementation

Within the scope of the claimed patent rights, the following embodiments of the utility model are possible.

The wire for overhead power lines contains a conductive core, round, sealed, twisted from aluminum alloy wires and water blocking threads. Over a conductive core, a winding of an electrically conductive water blocking tape may be applied. A semiconducting screen made of an electrically conductive cross-linked polyethylene composition is superimposed on top of the water blocking tape. Silane cross-linked polyethylene insulation is applied over the semiconducting screen. On top of the insulation, a shell is made of non-combustible, weather-resistant, light-stabilized and tracking-resistant polyethylene.

The manufacture of the wire is as follows.

The conductive core is twisted from aluminum alloy wire and from water-blocking threads, with a water-blocking tape wrapped on standard twisting equipment.

The semiconductor shield, insulation and sheath are applied to the conductive core using extrusion equipment.

Claims (3)

1. A wire for overhead power lines, comprising a conductive core twisted from aluminum alloy wires, a shield of an electrically conductive polymer composition, insulation from a crosslinked polymer composition and an outer sheath of a polymer composition, characterized in that the conductive core is twisted using water-blocking threads, and the insulation is made of a cross-linked polyethylene composition with an oxygen index of at least 32%. 2. The wire according to claim 1, characterized in that a winding is applied over a conductive core with an electrically conductive water blocking tape. 3. The wire according to claim 1, characterized in that an anti-icing composition is applied over the sheath.