Special electric cables and their pretective covering materials in environment with strong lightings, strong ultraviolet radiation, large temperature differential and cold

Abstract

In this invention, the material of the jacket illustrated, which is used for protecting the cable of special-purpose in the environments of high cold, strong ultraviolet, and strong thunderstorm. The material contains (weight portion) the polyvinyl chloride, 65-75, the sulphation butyronitrile rubber 25-35, the light stabilizer 0.1-3. The thickness of the jacket is greater than that of the standard about 20%. The armor layer applies the rough gauge wire with copper wire, which is suitable in applying in the plateau.

Description

technical field [0001] The invention relates to a cable, specifically, a special cable for high cold, large temperature difference, strong ultraviolet light and strong lightning environment and its sheath material. Background technique [0002] With the rapid development of our country's economy, the Qinghai-Tibet Railway, which has attracted worldwide attention, has started construction. The special geographical and climatic conditions of the Qinghai-Tibet Plateau have brought many difficulties to the project. It is urgent to research new technologies and develop new products. The cables needed for the Qinghai-Tibet Railway are among them. one. [0003] The climate of the Qinghai-Tibet Plateau is characterized by high cold (minimum temperature below -50°C), large temperature difference between day and night, strong ultraviolet radiation, and strong and frequent lightning in some areas. At present, the existing cables at home and abroad cannot adapt to such a harsh environme...

AI Technical Summary

Problems solved by technology

[0003] The climate of the Qinghai-Tibet Plateau is characterized by high cold (minimum temperature below -50°C), large temperature difference between day and night, strong ultraviolet radiation, and strong and frequent lightning in some areas. At present, the existing cables at home and abroad cannot adapt to such a harsh environment. The main reasons are: 1. Plastic materials such as the insulation layer and sheath of the cable have poor low-temperature performance, and are easily broken when used in high-cold regions; 2. Under the environmental conditions of large temperature difference and frequent high and low temperatures, plastic materials suffer from severe thermal fatigue , aging quickly; 3. Plastic materials are prone to aging and failure under strong ultraviolet radiation; especially the sheath on the outer layer of the cable ages quickly and has a short service life; 4. In areas with strong lightning, the lightning protection facilities of the cable cannot completely shield the lightning impact , there is still some residual potential acting on the cable, the ordinary armor layer cannot withstand the residual lightning current, the ordinary sheath has poor ability to withstand the residual lightning potential, and cannot play the role of lightning protection, and the cable insulation is easy to be broken down

In addition, the Qinghai-Tibet Plateau has high mountains and deep trenches. When laying cables, the construction traction force is very large; cables laid on large slopes also have large tension due to their own weight, and the strength of ordinary armor layers is not enough.

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