PRYSMIAN GROUP | 525 kV HVDC XLPE technology XLPE insulation technology is based on polyethylene and requires a cross-linking process, which is essential for stabilizing the insulation material. This process determines the presence in the insulation of crosslinking by-products (such as methane, cumyl alcohol, acetophenone, etc.). These by-products should be removed, after the crosslinking with a specific thermal treatment process, known as “degassing”. The degassing operation decreases the amount of residual by-products present in the cable. Electrical and thermomechanical working performance should be selected accordingly, to guarantee reliable system operations at the ever-increasing voltage levels. MAIN XLPE TECHNOLOGY ADVANTAGES: PERFORMANCES: High transmission power, longer transmission lengths with lower system losses Insulation and accessories tested up to 600 kV DC Underground and submarine cable systems fully qualified up to 525 kV in accordance with CIGRE Technical Brochure 852 Using the technological platform used for XLPE AC and DC cables Further optimization of 320 kV voltage class Higher operating temperatures than classic paper cables Higher electrical strength than state-of-the-art 320 kV extruded systems Very low electrical conductivity and high thermal stability The newly developed XLPE material presents higher cleanliness and lower electrical conductivity, allowing for an increase of the maximum allowable electrical stresses in the insulation (if compared to the previous XLPE materials), meaning that the conductivity is more stable between cold and hot conditions. As a result, it is possible to reach cable voltage levels up to 600 kV, while reducing thicknesses at standard voltages with lighter and less expensive cables.
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