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The Western HVDC Link

Alan Capon
I did originally answer the previous thread, but have since deleted my response and I believe a new thread with a proper and correct title is the correct way of answering. 


More info on the fault here: https://www.energy-reporters.com/transmission/italys-prysmian-under-fire-over-uk-interconnector-failure/ 


Reports suggest an undersea cable fault in the vicinity of Liverpool Bay. 


Regards,


Alan.
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  • 0
    AFAIK, repairs are not carried out on the seabed. The fault must first be located using a TDR. Sufficient length of cable needs to be de-buried in order that a loop (including the fault) can be brought to the surface, where it will be cut. Hopefully, the fault is at or close to the cut. A new section is then jointed in, with the fault cut out. The cable is then lowered to the seabed, and re-buried. After testing, including a new TDR profile of the repaired cable, it can be restored to service. I can’t remember how much spare we have, but it is measured in km, as that is the likely section that will be jointed in. The trick is doing the cut, such that the cable length you have will bypass the fault. 


    Regards,


    Alan.
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  • 0
    AFAIK, repairs are not carried out on the seabed. The fault must first be located using a TDR. Sufficient length of cable needs to be de-buried in order that a loop (including the fault) can be brought to the surface, where it will be cut. Hopefully, the fault is at or close to the cut. A new section is then jointed in, with the fault cut out. The cable is then lowered to the seabed, and re-buried. After testing, including a new TDR profile of the repaired cable, it can be restored to service. I can’t remember how much spare we have, but it is measured in km, as that is the likely section that will be jointed in. The trick is doing the cut, such that the cable length you have will bypass the fault. 


    Regards,


    Alan.
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