A production process of long stator cable for maglev rail transit

Abstract

The invention provides a production process of a long stator cable for maglev rail transit. The production process includes the following steps: S1, center line and single-core conductor wire drawing; S2, center line and single-core conductor twisted together; S3, Z-shaped single-wire or S-shaped single-wire wire drawing; S4, overall conductor Stranding; S5, conductor annealing; S5, three-layer co-extrusion of conductor shielding layer, insulating layer, and insulating shielding layer outside the conductor; S6, extruding a sheath outside the insulating shielding layer. The invention improves the production speed, saves energy consumption, and ensures that the filling factor of the conductor reaches above 0.95.

Description

technical field [0001] The invention relates to a production process of a long stator cable for maglev rail transit, and belongs to the field of cable production. Background technique [0002] At present, there are three types of conductors designed for long stator cables for maglev rail transit: [0003] 1. The core wire is twisted with fan-shaped aluminum wire, and the outer layer is twisted with aluminum wire. [0004] 2. The core wire is twisted with 7 round aluminum wires, and the outer layer is twisted with aluminum-shaped wires. [0005] 3. The core wire is twisted with fan-shaped aluminum wire, and the outer layer is twisted with trapezoidal wire. [0006] French Nexans Cable and Shanghai Electric Cable Research Institute adopt the first and second structures, and Far East Cable Co., Ltd. adopts the third structure. [0007] The currently known single-core or multi-core aluminum conductors or aluminum alloy conductors are usually twisted and pressed into fan-shape...

AI Technical Summary

Problems solved by technology

[0009] During the use of these cables, there are induction currents, capacitive currents and leakage currents that are conducted along the axial direction of the cables, which will increase the ground potential of the cable shielding layer and easily cause safety accidents

[0010] In addition, the current production process of cable conductors, including CN102403051A, etc., is to design a wire drawing die to draw the wire conductor through a large drawing machine, and then twist the conductor produced by a cage stranding machine or a frame stranding machine. The problem is that the production efficiency of shaped wire conductor drawing is low and the energy consumption is large. The drawing speed of ordinary round wire can reach 24m / s, and the drawing speed of shaped wire does not exceed 12m / s.

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