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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.
  • 0

    Kelly Marie:

    The west line goes thru Devon and in to Cornwall then it loops round to north Devon then into Wales the east one goes to Southampton then eventually onto dunganess  I don't know which way power flows. 




     

    It goes whichever way It needs to at the time.  The big advantage of having loops is that if a line goes down, the power can be sent round the other way, so you don't get huge areas blacked out.  I live on the big loop that goes all around the coast of Kent (including Dungeness) and Sussex, before meeting up with another line that runs from London to the South coast.
  • 0

    Kelly Marie:

    Also what's the significance of zebra?




    As you've seen from your tree mendous there's an odd habit (in the english speaking countries at least) to have code words for different types and sizes of overhead conductor so that you don't have to state the full size, number of strands, composition, etc every time you mention it.  ACSR conductors are named after animals not trees and, since there's a lot of different ways to make an ACSR conductor even having the same nominal size but maybe with different strengths, you have to be precise as to which one you mean.

    Have a look at https://www.midalcable.com/sites/default/files/ACSR-metric.PDF

  • 0

    It goes whichever way It needs to at the time.



    A typical pylon carries two circuits (6 lines in total) and they seem to be able to isolate just one of the circuits leaving the other one live - at least that's what seemed to happen near me when the "re-wired" the local pylons - one side one summer, the other the next. Presumably only an option when demand is low (summer) but does seem to give an opportunity for planned maintenance.


       - Andy.
  • 0
    Yes, it is usual to re-conductor one side with the other side live. The biggest issue is earthing, due to inductive pickup from the live circuit. The pickup is sufficient to kill and burn. Applying sufficient earths to keep everyone safe as well as not welding the bearings on the winches is a specialised subject. 


    Regards,


    Alan.

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