A high-voltage power cable carries electricity above 36 kV, where insulation quality determines service life. Modern high-voltage power cable designs use cross-linked polyethylene (XLPE) dielectrics over stranded copper or aluminum conductors, wrapped with semiconductive screens, metallic armour and an outer sheath. Selection depends on rated voltage, load current, fault level and route: duct, direct burial or aerial. Bending radius should exceed twenty cable diameters, and pulling tension must stay within limits to prevent conductor damage. Defective joints cause most in-service failures; humidity control during splicing prevents water treeing. VLF withstand testing and tan delta measurement expose insulation aging before breakdown. A properly specified high-voltage power cable stays reliable for thirty years.
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