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HVAC Submarine Cable

HVAC submarine cables are widely used in the offshore connections with higher transmitted power for offshore wind farm and power transmission between mainland and island.

ZTT is proficient in manufacturing  HVAC submarine cables for both three-cores and single core types and has an average annual capacity of 500km. ZTT has supplied more than 1,000 km HV submarine power cables since 2009, including three cores 220 kV and single core 500 kV cable.


Design & Construction

System voltage:



 Circular stranded copper or aluminum conductor constructed of round or profiled wires.  

 Max. CSA 3000sq.mm


 Cross-linked polyethylene (XLPE)

Metallic Screen:

 30kV≤U≤66kV: Copper wire, lead alloy sheath

 U≥110kV: Lead alloy sheath

Radial water barrier:

 Semi-dry design: Laminated aluminum foil

 Dry design: Lead alloy sheath


 Three-core: Galvanized steel wire

 Single-core: Magnetic galvanized steel wire; Non-magnetic HD copper wire, stainless steel wire

Armor bedding & serving:

  Polypropylene yarns


Reference Standards

IEC standards:

IEC 60840, IEC 62067

CENELEC Standards:

HD605 HD620

ICEA standards:

ICEA S 108-720

CIGRE recommendations:

CIGRE 490, CIGRE 623

Types & Purposes

  • For Oil & Gas

    -Power supply from onshore substation to offshore oil & gas platform

    -Connection between offshore oil & gas platforms

  • For interconnection

    -Interconnecting grids of countries

    -Power supply from mainland to isolated islands

  • For offshore wind farm

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


ZTT has the capability to manufacture long continuous length HVAC submarine cables without factory splices as it is equipped with the state-of-the-art VCV lines, vertical assembly lines with big carousels and enough outdoor storage carousels for completed cables.  Moreover, the wharf is only 80 meters from the storage carousels, which can minimize the risk during cable load out.


Representative Projects

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