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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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    Overhead lines at 400kV will use bundled conductors, not single conductors - that is, for each phase 3 or 4 conductors held in a spaced bundle.  The spacing is both to improve cooling and also to increase the effective diameter of the conductor bundle to reduce corona discharge.  In addition the spacers, which are flexible, help to damp vibrations.

    In the UK 400kV lines are most commonly either 3 x 400 mm2 ACSR (Zebra) or 4 x 400 mm2 ACSR (Zebra), the 3 bundle rated about 1200MVA and the 4 bundle rated about 1800MVA.  [ACSR = aluminium conductor steel reinforced, that is aluminium strands laid around a stranded steel core for tensile strength]
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    Overhead lines at 400kV will use bundled conductors, not single conductors - that is, for each phase 3 or 4 conductors held in a spaced bundle.  The spacing is both to improve cooling and also to increase the effective diameter of the conductor bundle to reduce corona discharge.  In addition the spacers, which are flexible, help to damp vibrations.

    In the UK 400kV lines are most commonly either 3 x 400 mm2 ACSR (Zebra) or 4 x 400 mm2 ACSR (Zebra), the 3 bundle rated about 1200MVA and the 4 bundle rated about 1800MVA.  [ACSR = aluminium conductor steel reinforced, that is aluminium strands laid around a stranded steel core for tensile strength]
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