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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]
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.
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]
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]
EPM is even more prevalent as an insulator for high-voltage cables (usually referred as HEPR - Hard grade Ethylene Propylene Rubber) since it has improved insulative characteristics over more traditional cables, such as cross-linked polyethylene, enabling a smaller cross sectional area for the same load carrying capacity.