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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.
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]
The Caithness–Moray link was approved by regulators in 2014, [5] with the contract for laying the undersea cable awarded to NKT. 113 km (70 miles) of the link runs beneath the sea, with a total of 48 km (30 miles) of underground cross-linked polyethylene cable at both ends. [6]
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]
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.
Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.
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