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HVDC Submarine Cable

HVDC submarine cables are mainly used for the transmission of large amounts of power over a long distance with low losses, especially for offshore generation sites that are far from shore (>70km). HVDC submarine cables are typically single-core cables with extruded insulation and metallic radial water barrier. ZTT has the capability of manufacturing the HVDC submarine cables with an annual capacity of 1000km and had made a series of great achievements in extruded HVDC cable industry.



Design & Construction


System voltage:

 Up to 525kV

Conductor:

 Circular stranded copper conductor constructed of round or profiled wires.

 Max. CSA 3000sq.mm

Insulation:

 Cross-linked polyethylene (XLPE)

Metallic Screen/Sheath:

 Lead alloy sheath

Armor:

 Galvanized steel wire

Armor bedding & serving:

 Polypropylene roving





Reference Standards


CIGRE recommendations: CIGRE 496, CIGRE 623.



Types & Purposes


●For offshore wind farm

-Export cable to transport the total generated power from offshore substation to onshore substation

●For interconnection

-Interconnecting grids of countries

-Power supply from mainland to isolated islands




Advantages


ZTT has the capability to manufacture long continuous length HVDC submarine cables without factory splices with the state-of-the-art VCV lines and large indoor turntables for transferring and store the long length complete submarine cables with two big outdoor turntables to deliver in one segment without necessity of using offshore joint. Moreover, the rather short length (80m) for cable loading out to the vessel calling at the wharf greatly reduces the risk during the process.








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HVDC Submarine Cable