Water-tree-resistant medium-voltage cross-linked cable

Abstract

The invention discloses a water-tree-resistant medium-voltage cross-linked cable, which comprises a cable core, wherein the cable core is formed through the extruded arrangement of three materials ofan insulating material, a conductor and an insulating semi-conductive shielding material, the arrangement sequence of the three materials from inside to outside is the conductor, the insulating material and the insulating semi-conductive shielding material, the insulating material is cross-linked polyethylene, and is added with a special additive capable of improving the water-repellent potentialenergy of the cross-linked polyethylene molecule, and the insulating material added with the special additive comprises: 80-120 parts of LDPE, 1-2 parts of a water-tree-resistant additive ethylene acrylic acid copolymer EAA, 0-1 part of sorbitol DBS, 1.2-2.3 parts of an auxiliary cross-linking agent triallyl cyanurate, 1.7-2.7 parts of a cross-linking agent dicumyl peroxide DCP, 2.2-3.4 parts of an antioxidant 300, and 1-1.2 parts of phenolphthalein. According to the present invention, with the water-tree-resistant medium-voltage cross-linked cable, the damage of the cable water tree to the reliability of the cable is effectively reduced, and the direct and indirect economic loss caused by the short circuit fault of the power supply line is substantially reduced.

Description

technical field [0001] The invention belongs to the technical field of medium-voltage cross-linked cables, and in particular relates to a water-tree-resistant medium-voltage cross-link. Background technique [0002] At present, my country's medium-voltage cables (6kV-66kv) mainly use ordinary cross-linked polyethylene insulation, and antioxidants, stabilizers, cross-linking accelerators and other components are added to the insulation formula to optimize the performance of cable products. The cross-linking method is mainly peroxide cross-linking, that is, linear low-density polyethylene resin is used, and the active groups formed by the decomposition of peroxide cross-linking agents rob the hydrogen atoms on the polyethylene molecules to form active bonds, and then form a spatial network. Cross-linking structure, the cross-linking process is carried out in a high-temperature and high-pressure pipeline filled with nitrogen. A layer of semi-conductive shielding layer is extru...

AI Technical Summary

Problems solved by technology

The cables produced by the prior art will produce a large amount of water branches in the time of 8 to 12 years of use, and the electric strength of the cable will drop by about 25%-50%, resulting in frequent cable breakdown accidents and huge economic losses. At the same time Accidental cable failure will cause a large-scale power outage on the cable line, resulting in even greater indirect economic losses