For medium voltage applications, reactivity can be boosted significantly. Numerous modifications in the basic polymer structure can be made to maximize productivity during the manufacturing process. XLPE has excellent dielectric properties, making it useful for medium voltage-10 to 50 kV AC, and high voltage cables-up to 380 kV AC-voltage, and several hundred kV DC. They have a conductor short-circuit rating of 250 ☌. XLPE-insulated cables have a rated maximum conductor temperature of 90 ☌ and an emergency rating up to 140 ☌, depending on the standard used. XLPE has one of the best water resistance and low permeability capacities and abilities.Īlmost all cross-linkable polyethylene compounds (XLPE) for wire and cable applications are based on LDPE. This permits higher operating temperatures, both for normal loading and under short-circuit conditions, so that an XLPE cable has a higher current rating than its equivalent PVC counterpart. The effect of the cross-linking is to inhibit the movement of molecules with respect to each other under the stimulation of heat and this gives the improved stability at elevated temperatures compared with the thermoplastic materials. ![]() Crosslinking improves the elevated-temperature properties of the base polymer. Polyethylene has been and still is used as a cable insulant, but, as a thermoplastic material, its applications are limited by thermal constraints.
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