500kV and below single-core cross-linked power cable insulation joint and manufacturing process thereof

Abstract

The invention discloses a 500kV and below single-core cross-linked power cable insulation joint and manufacturing process thereof. The method comprises: heating an extrusion molding machine body mold,a supporting heating insert mold and an extrusion glue inlet mold to the extrusion temperature of 90-105 DEG C; starting the preheated plastic extruding machine, injecting the colloid into an extrusion molding machine body mold through an extrusion glue inlet mold, and when the colloid fills the whole extrusion molding machine body mold and flows out of a glue outlet, enlarging the rubber elasticrubber pipe by the colloid; and heating the extrusion molding machine body mold and the supporting heating insert mold, meanwhile, heating a cable conductor at the joint, and the colloid being subjected to a rapid grafting cross-linking reaction under a given condition. The manufacturing process is convenient to operate, the manufactured insulating joint and the cable body can form the characteristic of equivalent connection, and the mechanical and electrical properties of the cable body are met. The insulating layer is well crosslinked with the original cable and other recovery layers, so that the generation of an active interface is avoided.

Description

technical field [0001] The invention relates to the field of cable joints, in particular to a 500kV and below single-core cross-linked power cable insulation joint and a manufacturing process. Background technique [0002] With the development of urban construction, the application of power cables is becoming more and more extensive. High-voltage single-core cross-linked cables are usually composed of metal conductors, conductor shielding layers, insulation layers, insulation shielding layers, buffer layers, metal sheaths, and outer protective layers. Between the conductor of the cable and the metal sheath, it can be regarded as the primary winding of an air-core transformer. When the conductor of the cable passes through the AC current, a part of the magnetic field lines generated around it will be hinged on the metal sheath, and the metal sheath will generate an induced voltage. The magnitude of the induced voltage is proportional to the length of the cable line and the c...

AI Technical Summary

Problems solved by technology

However, the existing manufacturing process is complicated, and it is not easy to form an equivalent connection between the insulating joint and the cable body, which cannot meet the mechanical and electrical properties of the cable body, and the movable interface is easy to produce. The movable interface contains micro air gaps, micro Harmful factors such as water and impurities can easily lead to interface polarization and discharge along the air gap, which will bring serious hidden dangers to the operation of the power grid

At the same time, most of the wire cores of the existing insulating joints are mechanically connected, and the contact resistance at the connection is relatively high, which is likely to cause heat generation; there are also forming devices used to make insulating joints, but the current forming device has a complex internal structure, large volume, and extremely inconvenient operation , and there is also an active interface between the formed insulation joint and the cable main body insulation

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