XLPE insulated cable uses chemical or physical methods to change the cable insulation polyethylene molecules from linear molecular structure to the main network molecular structure, that is, thermoplastic polyethylene is transformed into thermosetting crosslinked polyethylene, thereby greatly improving it. Its heat resistance and mechanical properties reduce its shrinkage, making it no longer melt after being heated and maintaining excellent electrical properties.
XLPE insulated cable is a kind of cable suitable for distribution network and other fields. It has simple structure, light weight, good heat resistance, strong load capacity, non-melting, chemical resistance and high mechanical strength.
XLPE insulated cable is suitable for power distribution networks, industrial installations or other fields requiring large capacity electricity. It is used for fixed laying on power transmission and distribution lines with AC 50Hz and rated voltage 6kV ～ 35kV. Its main function is to transmit electrical energy.
The cross-linked polyethylene insulated cable adopts the method of peroxide cross-linking to change the polyethylene molecule from a linear molecular structure to a three-dimensional network structure and a thermoplastic material to a thermosetting material. Improve the current carrying capacity of the cable. XLPE insulated cable has the following advantages: 1. Heat resistance: XLPE with mesh structure has excellent heat resistance. It does not decompose and carbonize below 300 ℃, long-term working temperature can reach 90 ℃, and thermal life can reach 40 years.
2. Insulation performance: XLPE maintains the original good insulation characteristics of PE, and the insulation resistance is further increased. Its dielectric loss tangent value is very small, and it is not greatly affected by temperature.
3. Mechanical characteristics: Due to the establishment of new chemical bonds between macromolecules, the hardness, stiffness, abrasion resistance and impact resistance of XLPE have been improved, thereby making up for the shortcomings of PE being easily cracked by environmental stress.
4. Chemical resistance: XLPE has strong acid and alkali resistance and oil resistance. Its combustion products are mainly water and carbon dioxide, which have less harm to the environment and meet the requirements of modern fire safety.