Method for manufacturing metal shielding layer of 'SZ' type copper-wire-shielded medium-voltage cable

Abstract

The invention discloses a method for manufacturing a metal shielding layer of an 'SZ' type copper-wire-shielded medium-voltage cable. The twisting pitch of the metal shielding layer is partitioned into a front half section and a back half section; when a power cable moves forward at a certain speed, a process for forming the front half section of the twisting pitch comprises the following steps of: clockwise rotating a plurality of metal wires by a first angle to clockwise wrap the metal wires on the surface of an insulating layer; and fixing the tail end of the front half section; and when the power cable moves forward at a certain speed, a process for forming the back half section of the twisting pitch comprises the following steps of: anticlockwise rotating a plurality of metal wires by a second angle to anticlockwise wrap the metal wires on the surface of an insulating layer; and fixing the tail end of the back half section. In the method for manufacturing the metal shielding layer, the problem of cable damage hidden trouble caused by the increase in the cable binding force of the copper wire shielding layer when a heated inner layer wire core expands after the cable runs can be solved effectively.

Description

technical field [0001] The invention relates to a power cable, in particular to a method for manufacturing a metal shielding layer of an "SZ" type copper wire shielded medium-voltage cable. Background technique [0002] The existing single-phase copper wire shielding adopts the type of twisted and sparse winding. When twisted and sparse winding is adopted, the copper wire layer has a relatively large tightening force on the inner core. The expansion of the core, relatively speaking, the copper wire has a greater tightening force on the core. In the long run, this tightening force will affect the change of the thickness of the semi-conductive layer, and even damage the insulation, which has a great impact on the life of the cable. It is very necessary to study an effective solution to copper wire shielding of medium voltage cables. Therefore, designing a metal shielding layer braiding method for power cables can effectively solve the problem that the copper wire has a greate...

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Problems solved by technology

Therefore, designing a metal shielding layer braiding method for power cables can effectively solve the problem that the copper wire has a greater tightening force on the wire core due to the expansion of the inner layer wire core after the cable runs, and has become an important issue in the field. The direction of ordinary technical personnel's efforts

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