Low-voltage cable intermediate joint cold contraction technology

Abstract

The invention belongs to the technical field of electric power, and especially relates to a low-voltage cable intermediate joint cold contraction technology, which can remedy defects such as coarse original material, poor insulation performance and sealing performance, weak tolerance mechanical strength, and easily getting heated and burnt of a 0.4kV low-voltage cable intermediate joint and significantly improve equipment safety running coefficients. The low-voltage cable intermediate joint cold contraction technology fundamentally helps to reduce fault probability of the 0.4kV low-voltage cable intermediate joint. The use of the new technology and the material provide effective technical support for personal safety and equipment safety, and at the same time helps electric power enterprises to save a large amount of maintenance funds, not only promotes increase of profits of the electric power enterprises but also achieves huge social benefit due to stable and continuous power supply.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a cold-shrinking process for an intermediate head of a 0.4kV low-voltage cable. It can improve the shortcomings of the original material of the middle head of the 0.4kV low-voltage cable, such as rough material, poor insulation performance, poor sealing performance, weak mechanical strength, and easy heating and burning of the middle joint. Background technique [0002] As we all know, the power cable joint is the weak point of the whole cable. When the failure of the intermediate head of the 0.4kV low-voltage cable occurs, it is mainly manifested in the fact that the intermediate joint technology used at this stage is the heat shrinking process. The tube is baked. During the baking process, it cannot be guaranteed that the heat-shrinkable tube is uniformly heated and shrunk at any position. In this way, the intermediate joint will shrink unevenly due to the h...

AI Technical Summary

Problems solved by technology

[0002] As we all know, the power cable joint is the weak point of the whole cable. When the failure of the intermediate head of the 0.4kV low-voltage cable occurs, it is mainly manifested in the fact that the intermediate joint technology used at this stage is the heat shrinking process. The tube is baked. During the baking process, it cannot be guaranteed that the heat-shrinkable tube is uniformly heated and shrunk at any position. In this way, the intermediate joint will shrink unevenly due to the heat-shrinkable tube, and there will be air bubbles or gaps in the tube, resulting in poor airtightness and insulation. poor performance defect

At the same time, the 0.4kV low-voltage intermediate head accessories at this stage do not include constant force springs, ground wires, armor belts and other accessories that increase the smooth operation of the intermediate head, so that the existing 0.4kV low-voltage intermediate head has the following shortcomings and deficiencies: 1 1. The airtightness is poor, and the cable core is easy to enter water and be damp; 2. The mechanical strength is weak and it is easy to be damaged by external force; 3. The insulation performance is not strong, and it is easy to have single-phase grounding, phase-to-phase short circuit and disconnection.