500kv and below single-core cross-linked power cable insulation joint and its manufacturing process

Abstract

A manufacturing process for insulating joints of single-core cross-linked power cables of 500kV and below, including heating the extrusion molding body mold, support heating insert mold, and extrusion injection mold to the extrusion temperature of 90-105°C, after starting the preheating The extruder, the colloid is injected into the extrusion molding body mold through the extrusion injection mold. When the colloid is filled with the entire extrusion molding body mold and the colloid flows out from the discharge port, the colloid will fill the rubber elastic hose; The temperature of the injection molding body mold and the supporting heating insert mold is raised, and the temperature of the cable conductor at the joint is raised at the same time, and the colloid undergoes rapid grafting and crosslinking reaction under given conditions. The manufacturing process of the present invention is easy to operate, and the insulating joint and the cable body can form an equivalent connection, satisfying the mechanical and electrical properties of the cable body; the insulating layer is well cross-linked with the original cable and other recovery layers, and the movable interface is avoided generation.

Description

Technical field[0001]The present invention relates to the field of cable joints, in particular a single core cross-linking power cable insulation joint and fabrication process of 500 kV and below.Background technique[0002]With the development of urban construction, the application of power cable is increasingly wide. The high voltage single core crosslinking cable is typically composed of a metal conductor, a conductor shield, an insulating layer, an insulating shield, a buffer layer, a metal sheath, and an outer protective layer. Between the conductor and metal sheath of the cable, it can be seen as a primary winding of a hollow transformer. When the conductor of the cable passes the AC current, a part of the magnetic line generated around the metal sheath will be hinged, and the metal sheath generates the induced voltage, the size of the induced voltage and the length of the cable line, and the current flowing through the conductor, the cable is very At a long time, the induced vo...

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

Images