Shaped wire stranded cable conductor and production method thereof

Abstract

The invention relates to a special-shaped wire strand cable conductor and a production method of the special-shaped wire strand cable conductor and relates to a wire and cable special-shaped wire strand round conductor with the nominal cross section ranging from 25 mm<2> to 630 mm<2>. The cable conductor comprises a single round wire and special-shaped wires with all the strand layers designed in the tile-shaped structure according to the specifications of cables. The production method includes the steps that first, according to the designed special-shaped wire structure, the single round wire in the center is manufactured in a drawing mode through a drawbench, and then the special-shaped wires of various specifications of strand layer structures are manufactured on a water tank type or sliding type or fractional motor type drawbench in a drawing mode through a special-shaped high-speed wire drawing die; the round line in the center is placed on a payoff rack of a wire stranding machine, and all the stranding layer special-shaped wires are placed on a frame winch or fork winch and manufactured into the special-shaped wire strand cable conductor through stranding. The outer surface of the cable conductor is smooth and free of burrs, the gap between single wires is small, the filling coefficient is larger than 0.98, and the strand cable conductor is stable in structure. The production method is high in technology universality, and updating and upgrading of the products can be achieved in small and medium-sized enterprises through the technology.

Description

technical field [0001] The invention relates to a special-shaped wire twisted cable conductor and its production method, in particular to a cable with a conductor specification of 25-630mm 2 The utility model relates to a twisted round conductor of special-shaped wire and cable and a production process method thereof. Furthermore, it is a round conductor of aluminum, aluminum alloy, copper wire and cable that can be applied to 3KV and below, copper (aluminum) core medium and high voltage power cable conductors of 10KV and above voltage level, submarine cable conductors, magnetic levitation cable conductors, etc. Special cable conductors with high precision requirements. Background technique [0002] The conductors of fixed laying cables shall implement the national standard GB / T3956-1997 Type 2 stranded conductors, and the national standard for round compact conductors only stipulates the minimum number and maximum resistance value of different specifications. The specific...

AI Technical Summary

Problems solved by technology

[0006] 1) The conductor filling factor is small, and the outer diameter of the conductor is too large; the maximum compression coefficient of conventional tungsten steel can reach 0.8, and the maximum compression factor can reach 0.9 with the best nano-mold. The small coefficient makes the outer diameter of the cable conductor too large

[0007] 2) The resistance increase of the conductor before stranding and after stranding is relatively high, which is not enough energy-saving and environmental protection for the conductor in the process of power transmission; the circular compacted stranding structure is formed by cold drawing by a compacting mold, and the conductor is formed during the compacting process. The frictional heat between the mold and the mold is relatively severe, so that the molecular lattice of the copper or aluminum or aluminum alloy conductor changes under the action of heat, causing the resistivity to increase and the resistance to increase; Before and after tight twisting, the resistance increases by 2% to 5%. In order to make up for this defect, the diameter of the single wire is often increased during structural design, so that the conductor resistance can meet the specified value of the national standard.

[0009] 4) The surface of the conductor is not round and smooth enough, and the gap between the single wires is relatively large; when the cable is extruded and insulated, the insulating material will enter the gap between the wires on the conductor surface and waste the insulating material; it is also used for medium and high voltage cables produced at 10KV and above The appearance is not smooth enough, which is not good for the homogenization electric field and partial discharge

[0010] 5) The outer diameter of the conductor of the circular compression stranded structure is too large, and it consumes more insulation and sheath materials and various auxiliary materials

[0011] 6) The spark test or voltage breakdown probability of the conductor cable with circular compact structure is relatively high; if the material of the circular compact mold is not good or the compact coefficient is not designed properly, the surface of the conductor is prone to burrs, and in severe cases, the conductor single strand breaks , When the conductor surface burr is produced in the insulation process, the spark insulation breakdown or breakdown of the withstand voltage test of the low-voltage cable, the partial discharge parameter value of the medium and high-voltage cable is unqualified or the breakdown of the withstand voltage test;

[0012] 7) For most of the circular conductors with the same nominal cross-section, the number of single wires is relatively large, and the production efficiency of the wire drawing and twisting process is relatively reduced, which invisibly increases labor costs and equipment power consumption

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