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A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.
By definition, multicore cables have an outer sheath which surrounds all of the inner conductors. This is usually in the form of an extruded PVC or cross-linked polyethylene jacket, often combined with an aluminium sheath under the surface for electromagnetic shielding. [6]
Multicore cables usually have a thick PVC or cross-linked polyethylene sheath protecting the bundle of individual cables. [20] The PVC sheath is extruded around the inner cables, and solidifies to hold the cables in a tight group.
Modern high-voltage cables use polymers, especially polyethylene, including cross-linked polyethylene (XLPE) for insulation. Figure 5: 69 kV Medium Pressure Oil Filled Cable. This cable features concentric copper conductors insulated in kraft paper. Shield on the individual phases is provided with interlaced carbon and zinc tapes.
Insulation: Cross-linked polyethylene (XLPE) is used in a number of power cables because it has good water resistance and excellent electrical properties. Insulation in cables ensures that conductors and other metal substances do not come into contact with each other. [3]
The cable will carry 2 GW. [5] The DC voltage will be +/-525 kV, using voltage source converter (VSC) technology, carried on cross-linked polyethylene (XLPE) cables, with a fall back option of mass impregnated (MI) cables. [1]
Middle 20th century jumper wires in the USA were 24 AWG single strand copper, with a soft polyethylene inner jacket and a cotton wrapper, impregnated to make it slightly brittle and easy to remove neatly. Late 20th century ones had a single, thicker coating of polyethylene cross-linked to provide a suitable degree of brittleness.
Cross-linked polyethylene (XLPE) is used up to 420 kV system voltage. It is produced by extrusion, with an insulation thickness of up to about 30 mm; 36 kV class cables have only 5.5 – 8 mm insulation thickness. Certain formulations of XLPE insulation can also be used for DC.