A Composite Structure Automatic Ice and Snow Melting Overhead Conductor

Abstract

A composite structure automatic ice and snow melting overhead wire, the inner twisted wire core is covered with a force-sensitive sensing layer, the force-sensitive sensing layer is covered with a heat-sensitive heating layer, and the heat-sensitive heating layer is covered with an outer twisted wire core. This wire is mainly used in areas with severe snow disasters or freezing rain disasters. It has strong ice and snow resistance, low overall cost, small line loss, and no need for later maintenance.

Description

technical field [0001] The invention relates to a wire, in particular to an overhead wire with a compound structure for automatically melting ice and snow. Background technique [0002] The existing overhead conductors are mainly made of steel-cored aluminum stranded wires. The outer surface of this conductor is helical, which can meet the requirements of safe power transmission in the absence of natural disasters such as snow disasters and freezing rain. In the case of weather, the surface of the wire is prone to snow accumulation, ice hanging or even ice coating, and the weight of the wire increases significantly, causing the wire to break or the tower to collapse, seriously damaging the power supply network. In 2008, there was continuous heavy snowfall and freezing rain in the south. A large number of power towers collapsed due to the heavy snow and ice, which caused power outages in 17 provinces and regions. The power supply system in some areas was paralyzed. Government...

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Problems solved by technology

[0003] In view of the above background, many schemes have been proposed in the industry to deal with the icing of overhead conductors. However, due to the uncertainty of ice and snow disasters, the balance of input costs and risks, these schemes have relatively serious defects, mainly including the following schemes: (1) The wires are twisted with special-shaped single wires, such as Z-shaped single wires, to reduce the gap between the cores and reduce the probability of ice and snow adhesion. This scheme has low reliability and weak anti-freezing and anti-icing capabilities

(2) The surface of the wire is coated with a layer of hydrophobic material, such as organic silicon, fluorosilicon acrylate copolymer and other polymer materials with low adhesion to the ice layer. This solution requires a lot of maintenance work in the later stage

(3) Directly introduce high thermal conductivity metal materials or non-metallic materials into the line, and eliminate ice and snow at high temperature by applying reactive power and increasing local current. This solution has large line losses and increases the weight of the wires. Practicality

The disadvantage of this solution is that as long as the ambient temperature is lower than the local temperature of the PTC material, even if there is no snowstorm or freezing rain, the PTC material will still automatically circulate heat, a large amount of electric energy will be converted into heat energy, and the line loss will be relatively large.

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