A cross-linked power cable terminal connector and its manufacturing method

Abstract

The invention proposes a cross-linked polyethylene power cable terminal connector and a manufacturing method, including an outer insulating sleeve, 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 includes an electrical outlet Rod, upper sealing flange, metal pressure plate, metal locking ring, rubber sealing ring and metal pressure equalizing cover; the lower sealing unit includes lower support flange, metal sealing sleeve, rubber sealing ring, rubber seal, lower sealing pressure plate and the grounding tailpipe; the stress control body is made by welding the insulating layer and the semi-conductive layer. According to the electric field strength of different voltage levels, the stress cone is designed to combine arcs and straight segments of different sizes to form a stress cone curve; the partially cross-linked stress cone is made into a stress control body for the later stage. Welded structure to avoid interfacial air gap discharge.

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, insulating layers, insulating shielding layers, buffer layers, metal sealing sleeves 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 su...

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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