Cross-linked power cable terminal connector and manufacturing method

Abstract

The invention provides a cross-linked polyethylene power cable terminal connector and a manufacturing method. The cross-linked polyethylene power cable terminal connector comprises an outer insulatingsleeve, a stress control body, an inner filling insulating agent, an upper sealing unit, a lower sealing unit and a supporting insulator; the upper sealing unit comprises an electric wire outlet rod,an upper sealing flange, a metal pressure plate, a metal locking ring, a rubber sealing ring and a metal pressure equalizing cover; the lower sealing unit comprises a lower supporting flange, a metalsealing sleeve, a rubber sealing ring, a rubber sealing piece, a lower sealing pressure plate and a grounding tail pipe; the stress control body is formed by welding an insulating layer and a semi-conductive layer, the semi-conductive layer is a trumpet-shaped partially-crosslinked stress cone prefabricated from a semi-conductive shielding material which is the same as that of a cable in a factory, and the partially-crosslinked stress cone designs arcs with different sizes according to electric field intensities of different voltage classes and combines the arcs with straight line segments toform a stress cone curve; the manufactured partial cross-linked stress cone is a later-period stress control body insulating layer and is combined with the later-period stress control body insulatinglayer in a fusion grafting cross-linking mode to form an integrated fusion welding structure, and interface air gap discharge is avoided.

Description

technical field [0001] The invention relates to cable accessories in the field of power cable transmission systems, more specifically, to a cross-linked polyethylene power cable terminal connector of 500kV and below and a manufacturing method thereof. 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. The cable terminal is installed at the end of the cable line, has a certain insulation and sealing performance, and is used to connect the cable to the power grid or other electrical equipment. The core components of the cable terminal are: outer insulating sleeve, stress control body, inner filling insulating agent, upper sealing unit, lower sealing unit and supportin...

AI Technical Summary

Problems solved by technology

The three stress control bodies are all made of rubber and fitted to the cable insulation shielding fracture to weaken the distortion field strength. Due to the difference between the rubber and the cable insulation material, the active interface is generated, and there is a certain micro air gap, micro Harmful factors such as water and impurities, under the joint action of electric field and thermal field, will cause discharge along the interface, accelerate the aging of insulating materials and eventually lead to insulation breakdown, which restricts the safe operation of the cable system

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