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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
    When running at maximum power, 2,200 MW a working voltage of 600 kV gives a current of 3,666A.


    Seeing that the latest fault is at the southern end of the link on pole 2 - I'm assuming that pole 2 is a physical pole or pylon rather tha HVDC speak for Positive or Negative(?) - if overhead, what sort of conductor would be used for 3,666A ? 


    In my "cable collection" box, I have a sample of HT-PEX 145 kV 1 x 2000mm2 aluminium cable and from tables see that this is good for just over 2,000A in air at 30 deg C or 1,375A direct burial at 20 deg C. The insulation being about 25mm over the aluminium. For this HVDC Link, four time the voltage and just under three times the current, suggests a monster cable, if in proportion the conductor would need to be about 90mm diameter, plus goodness knows how much insulation and my guess would therefore be about 290mm overall diameter plus any armouring, but what about uninsulated overhead?


    From a visit to the Dinorwig Pumped Storage facility a few years back, I asked about the underground cables - there being no overheads in the area and was told that it was an oil-cooled cable and if we went home via a particular road, the rather nice looking stone built bungalows, were actually the cooling stations for the oil.


    Clive

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  • 0
    When running at maximum power, 2,200 MW a working voltage of 600 kV gives a current of 3,666A.


    Seeing that the latest fault is at the southern end of the link on pole 2 - I'm assuming that pole 2 is a physical pole or pylon rather tha HVDC speak for Positive or Negative(?) - if overhead, what sort of conductor would be used for 3,666A ? 


    In my "cable collection" box, I have a sample of HT-PEX 145 kV 1 x 2000mm2 aluminium cable and from tables see that this is good for just over 2,000A in air at 30 deg C or 1,375A direct burial at 20 deg C. The insulation being about 25mm over the aluminium. For this HVDC Link, four time the voltage and just under three times the current, suggests a monster cable, if in proportion the conductor would need to be about 90mm diameter, plus goodness knows how much insulation and my guess would therefore be about 290mm overall diameter plus any armouring, but what about uninsulated overhead?


    From a visit to the Dinorwig Pumped Storage facility a few years back, I asked about the underground cables - there being no overheads in the area and was told that it was an oil-cooled cable and if we went home via a particular road, the rather nice looking stone built bungalows, were actually the cooling stations for the oil.


    Clive

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