Anti-icing automatic deicing anti-galling special-shaped overhead wire

Abstract

The invention discloses an anti-icing, self-deicing and anti-waving special-shaped overhead conductor which comprises a cable core. A plurality of cylindrical conducting layers having smooth outside surface and formed by a plurality of metal stranded wires which are intertwisted are wrapped outside a cable core. Adjacent conducting layers are mutually contacted in a pressing mode and are capable of relatively rotating. Heat and noise are generated, wind energy is consumed, waving caused by strong wind is significantly stopped, and safe operation of the conductor is ensured. Among the metal stranded wires of the outmost conducting layer is a metal stranded wire with a low curie point. When the temperature is lower than 0 DEG C, the metal stranded wire with a low curie point generates heat to enable surface ice of the overhead conductor to be melted. An interfering line is installed on the outer surface of the outmost conducting layer along the lead angle in intertwisting so that cross-section shapes at all points of the overhead conductor are different from each other, low-temperature high-humidity air leading to icing cannot land on the surface of the overhead conductor, and ice cannot form. The anti-icing, self-deicing and anti-waving special-shaped overhead conductor is suitable for being used in long-distance power transmission.

Description

technical field [0001] The invention relates to an anti-icing, automatic de-icing and anti-galling special-shaped overhead wire which can suppress ice coating on the overhead wire, automatically de-ice and prevent the wire from galloping. Background technique [0002] Most of the existing electric power overhead conductors are composed of wire core and stranded wire. The wire core is generally made of galvanized steel wire, which acts as a tensile force. The stranded wire is an aluminum wire. transmission. The overhead conductors with this structure should meet the requirements of safe power transmission in the non-freezing season or under the weather conditions without wind and snow. However, in actual operation, the disadvantage of this kind of overhead wire is: since the resistance per unit length of this overhead wire is constant, its power remains constant under the condition of constant current, that is to say, the resistance of the wire is constant. The calorific va...

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Problems solved by technology

However, in actual operation, the disadvantage of this kind of overhead wire is: since the resistance per unit length of this overhead wire is constant, its power remains constant under the condition of constant current, that is to say, the resistance of the wire is constant. The calorific value remains constant. When encountering heavy snowfall, freezing rain and low power load, frost, ice and icicles can be formed on the overhead wires, and even thicker ice can be formed on the surface of the overhead wires. The set increases the weight of the overhead wires, resulting in broken wires or towers, interrupting power transmission, bringing inconvenience to people's lives, and causing huge losses to the country.

Active anti-icing technology is adopted, that is, it involves overhead wires with anti-icing functions. The technologies in this area mainly include the following: 1. Develop hydrophobic coatings and apply them on the surface of overhead wires. However, there are coatings in this technology. There is still a big gap in the practical engineering application of technical problems such as low coating strength and unstable hydrophobic performance of the wire; 2. The overhead wire with a special structure is not a regular circle, but in One or more aluminum single wires on the outermost layer have a certain sharp corner, and it is difficult to freeze at the sharp corner due to the small contact surface between water and it. Practical application; 3. Wind one or more strands of low Curie temperature alloy outside the overhead wire, when the temperature is low

Alloy materials have high magnetic properties, and the overhead wires are heated by the magnetic eddy current loss generated by the current induction through the wires to prevent freezing. However, the Curie temperature point of low Curie temperature alloys that can be prepared so far is still high. It also limits the application of the technology

Passive deicing technology includes mechanical impact deicing technology and electrical heating deicing technology: mechanical impact deicing technology may cause mechanical damage to overhead wires and reduce the life of overhead wires, and should generally be avoided as much as possible; electrical heating deicing technology One of the technologies is to use a special structure overhead conductor in which the steel core and the aluminum stranded wire are separated by a layer of cross-linked polyethylene insulation. The resistance is large, and the power loss per unit length is large, thus playing the role of heating and deicing; the second electrical deicing technology is to use a movable generator to provide AC or DC power to the frozen overhead under the condition of power failure. A certain section of the wire is heated and deiced. Due to the geographical constraints of the overhead wire line, it is very difficult to carry a heavy power supply, which also limits the application of this technology.

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