HV Submarine Cable

Raw material testing for the High Voltage Submarine Cable HV XLPE ensures full compliance with IEC 60840 standards. Copper or aluminum conductors are tested for purity, conductivity, and elongation. XLPE insulation compound is rigorously evaluated for density, melt flow index, antioxidant levels, crosslinking potential, and water treeing resistance using OIT and DSC analysis. Lead or aluminum sheath materials undergo thickness uniformity and corrosion resistance tests. Galvanized steel wires are checked for zinc coating mass, tensile strength, and fatigue performance. The step-by-step process includes incoming batch verification, random sampling, chemical composition analysis via spectrometry, mechanical property testing before and after aging, hydrostatic pressure pre-simulation, and final material approval decision.

During manufacturing of the High Voltage Submarine Cable HV XLPE, process inspection maintains the highest quality standards. Conductor stranding and screening are monitored for uniformity. Triple extrusion (conductor screen, XLPE insulation, insulation screen) controls thickness and concentricity with online X-ray systems. Metallic sheath application ensures seamless water blocking. Steel wire armouring verifies helical winding, tension balance, and coverage. Final outer serving is applied with real-time monitoring. Key steps include material pre-drying confirmation, extrusion and armouring parameter logging, intermediate partial discharge testing, defect detection with immediate correction, and controlled cooling. This multi-stage oversight guarantees the High Voltage Submarine Cable HV XLPE achieves void-free insulation, strong armour protection, precise construction, and full IEC 60840 compliance throughout production.

The finished High Voltage Submarine Cable HV XLPE undergoes comprehensive testing to IEC 60840 standards. Routine tests include conductor resistance, AC voltage withstand, partial discharge (≤5pC), and insulation thickness verification. Mechanical tests cover tensile strength, crush resistance, and bending performance. Long-term tests include water penetration, hydrostatic pressure, and aging simulations. The process steps include sample preparation, gradual voltage ramp-up and hold period, mechanical load application, environmental conditioning, post-test electrical and mechanical re-measurement, and detailed visual inspection. Additional checks cover armour integrity and outer serving adhesion. Only cables passing all criteria are approved, confirming the High Voltage Submarine Cable HV XLPE’s superior electrical safety, mechanical robustness, and suitability for high voltage submarine power transmission.