Cross-linked polyethylene insulated cable is to use chemical method or physical method to make the cable insulation polyethylene molecule change from linear molecular structure to main body reticulated molecular structure, i.e., thermoplastic polyethylene change to thermosetting cross-linked polyethylene, so as to greatly improve its heat resistance and mechanical properties, reduce its shrinkage, make it no longer melt after heat, and maintain the excellent electrical properties. Cross-linked polyethylene insulated cable adopts the method of peroxide cross-linking to change the polyethylene molecule from linear molecular structure to three-dimensional network structure, from thermoplastic material to thermosetting material, and increase the working temperature from 70℃ to 90℃, which significantly improves the current-carrying capacity of the cable.

Cross-linked polyethylene insulated cable has the following advantages.

1、Heat-resistant performance: XLPE with three-dimensional mesh structure has very excellent heat-resistant performance. It will not decompose and carbonize below 300℃, and the long-term working temperature can reach 90℃, and the thermal life can reach 40 years.

2、Insulation performance: XLPE keeps the original good insulation characteristics of PE, and the insulation resistance is further increased. Its dielectric loss angle tangent value is very small, and it is not greatly affected by temperature.

3、Mechanical properties: Due to the establishment of new chemical bonds between macromolecules, the hardness, stiffness, abrasion resistance and impact resistance of XLPE have been improved, thus making up for the shortcomings of PE which is susceptible to environmental stress and cracking.

4. Chemical resistance characteristics: XLPE has strong acid and alkali resistance and oil resistance, and its combustion products are mainly water and carbon dioxide, which are less harmful to the environment and meet the requirements of modern fire safety.

Cross-linked polyethylene insulated cables are suitable for distribution networks, industrial installations or other fields requiring large-capacity electricity, and are used for fixed laying on power transmission and distribution lines with AC 50Hz and rated voltage from 6kV to 35kV, and their main function is to transmit electrical energy.

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