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HVDC Submarine Cables

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HVDC Submarine Cables

In 1922, 21-km-long submarine cables, the world’s longest at that time, were laid with a view to relocating Sumitomo’s copper mine refinery from Besshi to Shisaka Island off Niihama City, Ehime Prefecture. Sumitomo Electric, a pioneer in the manufacture of cables, has inherited submarine cable technology unbroken from that time, and is currently engaged in major submarine cable projects not only in Japan but also the world over.

Product lineup

Sumitomo Electric has an extra edge particularly in the field of long-distance, large-capacity, internationally linking DC submarine cables over which cable manufacturers are in fierce global competition. Owing to its capability of material development, Sumitomo Electric has developed the world’s top class DC insulator materials including nano-filler DC-CV insulator materials and polypropylene laminated paper (PPLP), and continues developing and producing DC cables capitalizing on its superiority in this field.

Product types and specifications

DC400kV DCCV cables
DC400kV DCCV cables
DC500kV PPLP™-MI cables
DC500kV PPLP™-MI cables

Accessories for cables

Rubber block joint

Rubber block joint

Accessories for power cables represent the key technology to cable system. We have been supplying all of the necessary accessories, including rubber block joint (RBJ).


Prefabricated Termination

Prefabricated Termination

Asahi Newpat 100™ (prefabricated terminations for 6,600-V XLPE cables) is the first product in Japan that employed the silicone rubber. This product is made from eco-friendly materials, and significantly reduces the time required for assembly.


Product applications

  • Long-distance, large-capacity DC submarine power transmission for international linkage
  • DC submarine power transmission for use with off-shore wind power generation
  • DC submarine power transmission for use in channel crossing/land bypassing
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