A heating and expanding diameter anti-ice and snow medium-strength aluminum alloy overhead cable

Abstract

The invention discloses a heating expanded-diameter ice and snow-preventing moderate-intensity aluminum alloy overhead cable. The cross section of an aluminum alloy monofilament conductor (4) of the cable is trapezoidal; a low-curie point alloy layer (6) is plated on the surface of the aluminum alloy monofilament conductor (4); a finger-shaped bump (7) is arranged on the aluminum alloy monofilament conductor (4) on an outer most layer; a nanometer ice and snow coating-preventing coating (8) is coated on the surface of an insulating layer (5); a hollow ceramic supporting frame (2) is arranged in an aluminum alloy soft hollow pipe (3); a heating resistor stripe (1) is placed in a groove (9) of the hollow ceramic supporting frame (2). The overhead cable with excellent freezing resistance provided by the invention is high in tensile strength, ice and snow attached to the surface of the cable can be melted, the phenomenon that the overhead cable is broken by the ice and snow accumulated on the surface of the cable is prevented, and safe and stable operation of a grid is guaranteed.

Description

technical field [0001] The invention relates to an electric power overhead cable, in particular to a heating and expanding diameter anti-ice and snow medium-strength aluminum alloy overhead cable. Background technique [0002] In recent years, due to climate change, severe ice disasters have occurred in many areas. The ice attached to the surface of the cable cannot be removed. If the ice is too heavy or the snow is too much, major accidents such as disconnection or short circuit may occur, causing huge economic losses. loss. After analysis, the main reasons are as follows: 1. The overhead cable itself generates little heat and cannot melt the ice layer attached to the surface; 2. The overhead cable adopts a pure aluminum single-wire structure. After twisting, the surface of the single wire is deformed. The tensile strength of a single wire is only 120-150MPa, which is low in tensile strength; 3. The conductivity of duralumin single wire is only 61% IACS, which reduces the ...

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Problems solved by technology

[0002] In recent years, due to climate change, severe ice disasters have occurred in many areas. The ice attached to the surface of the cable cannot be removed. If the ice is too heavy or the snow is too much, major accidents such as disconnection or short circuit may occur, causing huge economic losses. loss

After analysis, the main reasons are as follows: 1. The overhead cable itself generates little heat and cannot melt the ice layer attached to the surface; 2. The overhead cable adopts a pure aluminum single-wire structure. After twisting, the surface of the single wire is deformed. The tensile strength of a single wire is only 120-150MPa, which is low in tensile strength; 3. The conductivity of duralumin single wire is only 61% IACS, which reduces the power transmission of overhead cables; 4. In severely corroded coastal areas, pure The electrochemical corrosion of aluminum is serious, which shortens the service life; 5. Pure aluminum operates under long-term working conditions. With the increase of time, the creep performance will increase year by year. These are the main reasons for the breakage of overhead cables

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