Copper-coated steel strand carrier cable

Abstract

The invention relates to a copper-coated steel strand carrier cable, particularly to a copper-coated steel strand carrier cable used for electrified railways and urban rail transit overhead lines. The copper-coated steel strand is formed by stranding a copper-coated steel wire which is produced by a coating-drawing method or stranding the copper-coated steel wire and a copper wire. The selected hard copper-coated steel wires classified as 30H or 40H have a 30% IACS (international annealed copper standard) or 40% IACS relative conductivity, a strand diameter of phi 2.0-2.5 millimeters, a tensile strength of being >=1040 MPa (million pascal) or >=955 MPa, an elongation rate of being >=1.5%, a DC (direct current) resistivity of being <=0.058652 ohm*mm<2> / m or <=0.04397 ohm*mm<2> / m. The number of stranded copper-coated steel strands is determined by the bearable tension force of the carrier cable and can be 7, 19 or 37. A current-carrying carrier cable is made by the stranded combination of the copper-coated steel wires and the copper wires, wherein the number of the copper wires is determined by the magnitude of the current carried by the carrier cable and can be 12 or 18. The copper-coated steel carrier cable has a better corrosion resistance than a galvanized steel strand, and a better pulling strength than an aluminum-coated strand and a copper strand, and is cheaper than the copper strand.

Description

technical field [0001] The invention belongs to the field of metal materials for contact nets used in electrified railways and urban rail transit, and relates to a copper-clad steel strand catenary cable for hanging contact lines. Background technique [0002] In recent years, the metal materials used in catenary cables in my country's electrified railways and urban rail transit contact lines mainly include the following types: galvanized steel strands, aluminum-clad steel strands (or aluminum-clad steel-aluminum mixed strands), copper Stranded wire and copper alloy stranded wire, etc. Among them, although the galvanized steel strand has high tensile strength and low price, its electrical conductivity is poor, which increases the pressure loss and energy consumption of the catenary, and has poor corrosion resistance, so it is gradually eliminated; aluminum-clad steel strand or aluminum-clad steel-aluminum Due to the poor mechanical strength of aluminum, the poor corrosion re...

AI Technical Summary

Problems solved by technology

Among them, although the galvanized steel strand has high tensile strength and low price, its electrical conductivity is poor, which increases the pressure loss and energy consumption of the catenary, and has poor corrosion resistance, so it is gradually eliminated; aluminum-clad steel strand or aluminum-clad steel-aluminum Due to the poor mechanical strength of aluminum, the poor corrosion resistance in acidic or alkaline environments, and the complicated catenary structure to prevent electrochemical corrosion between it and copper contact wires, the use of hybrid stranded wires affects its use; Copper stranded wire has good electrical conductivity and good corrosion resistance, but its mechanical strength is poor, and the degree of relaxation changes greatly when the temperature changes, especially the price of copper is expensive, so there are not many used at present; although copper alloy stranded wire can overcome Pure copper stranded wire has weaknesses such as low mechanical strength, but poor electrical conductivity, complex smelting process, and relatively high cost

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