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>VISCAS technology for diagnosing submarine cable deterioration | |||||||||||||
| -Water-tree hidden in insulator | ||||||||||||||
| There is a possibility of water-tree deterioration in submarine XLPE cable which has been used for a long time. Growth of water-tree causes cable insulation destruction (grounding fault). VISCAS cable insulation deterioration diagnosis is performed to suit various types of cable and customer needs. |
6.6kV or less | DC leak current testing | ||||||||||||
| 22-33kV | Residual charge voltage sweep method (Wet cross-linked cable) Loss current method (Dry cross-linked cable) |
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| >VISCAS undersea cable inspection and cable work | ||||||||||||||
| -Electrical corrosion eats away armoring | ||||||||||||||
| Electrical corrosion and mechanical wear occur due to tidal EMF produced by the earth's magnetic field and tides, and there is a possibility of deterioration in iron wire armoring. There is potential for cable breakage accidents when submarine cable is corroded. |
We investigate iron wire status on the sea floor. | |||||||||||||
| > Inspection by divers > Inspection by underwater robot |
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| Address inquiries to: Submarine cable technologyDistribution tel.+81-3-5783-1916 fax.+81-3-5783-6994 |
Address inquiries to: Installation of Submarine CableUnderground Transmission tel.+81-3-5606-1672 tel.+81-3-5606-1942 |
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