COBRAcable back in operation
700 MW COBRAcable
to be back in operation today (8th January 2021), after approximate 105
days of downtime. The HVDC
been out of operation due to a failure since the end of September.
The cable operator, TenneT, had mobilized a team at sea to carry out cable
repair as soon as possible. The fault was investigated through a special
equipment where a tone or a pulse is sent through the cable to find the
exact location of the defect. Initially, it was suspected that the fault
had occured in the onshore part of the cable but later it was detected
in the submarine cable.
was cut at a depth of 40 metres on the seabed and lifted. On both sides
of the cut cable, the cable was measured 200 meters long to find the exact
fault location. The piece of cable where the fault has been located was
removed. A new piece has been installed and reconnected to the cable.
In the last couple of days, the cable has been successfully tested and
laid back, buried two meters deep in the seabed. The connection will be
able to transport electricity between Denmark and the Netherlands from
is a 320 kV HVDC connection between the Netherlands and Denmark. The 325
km long cable
is jointly owned by Energinet.dk and TenneT.
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