Modified composite shield cable and preparation method thereof

Abstract

The invention relates to a modified composite shield cable and a preparation method thereof. The modified composite shield cable is prepared from ethylene-vinyl acetate copolymer, wherein vinyl acetate accounts for 55 wt% of the copolymer; linear low density polyethylene, low density polyethylene, an antioxidant, dioctyl adipate, paraffin, dipentaerythritol ester, acetyl tributyl citrate, barium stearate, and dimethyl silicone oil. Compared with the prior art, according to the provided preparation method, the cable shield layer processing and moulding performance, mechanical performance, and electro-insulating and shielding performance are improved, the electric field on the conductor surface becomes uniform, the shielding and insulating performance of the cable is obviously improved; theharmful influence between the inner structure of the cable and the environment is reduced, and the power transmission becomes safer.

Description

technical field [0001] The invention belongs to the field of power transmission and distribution line equipment, and relates to a cable and a preparation method thereof, in particular to a modified composite shielded cable and a preparation method thereof. Background technique [0002] Low-voltage power cables and overhead insulation are important components of power transmission and distribution systems, and their safety performance plays a vital role in the terminal connection and power distribution of the entire power grid. The environment of low-voltage power cables and overhead insulated cables is sometimes extremely complicated when they are laid and erected. How to reduce the influence of the laying and erection environment on the cables, and at the same time reduce the impact of the cables on the environment during service and operation, and improve the comprehensive performance of the cables has important meaning. [0003] At present, cross-linked polyethylene mate...

AI Technical Summary

Problems solved by technology

[0003] At present, cross-linked polyethylene materials are commonly used as insulation shielding materials for low-voltage power cables and overhead insulated cables. In the actual production and application process, cross-linked polyethylene materials have the following deficiencies: 1). Due to the thermoplastic properties of the material, it is easy to cause the eccentricity of the shielding layer and the thickness of the shielding layer is uneven; 2), the degree of crosslinking of each part of the crosslinked polyethylene material is different during the crosslinking process, and the mechanical and electrical properties of the material are not uniform; 3) In practical applications, the outer insulation material of low-voltage power cables and overhead insulated cables is usually polyvinyl chloride. During the double-layer co-extrusion process, the combination of XLPE shielding layer and outer PVC The resistance needs to be improved, especially in the parts where the extrusion is eccentric and the cross-linking is insufficient, the delamination between the shielding layer and the insulating layer is easy to occur, which seriously affects the safety performance of the cable.