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11 KV cables.

broadgage
Until fairly recently, underground 11 KV cables were invariably 3 core, paper insulated, lead covered, with an earthed steel wire armouring. Then came the more modern plastic insulated cables, with earthed armour and a red plastic over sheath to distinguish them from LV cables.


However the modern trend seems to be a bundle a 3 single core cables, each with an aluminium core, plastic insulation, copper wire armouring and a red plastic sheath.

Why is this used ? It seems to me that 3 single core cables would be more costly to manufacture, and more labour intensive to joint or terminate, than one 3 core cable.

I fail to see the advantage, but presume that there must be some advantage, or why make the change ?
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    Just out of curiosity, do DNOs care about phase order? I.e. as long as they are in the correct phase rotation sequence, do they care whether the correct of the three red cables coming into the substation is identified as 'red' phase?


    Or do they do a large-scale equivalent of a ring final circuit, where order would then be important?
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  • 0
    Just out of curiosity, do DNOs care about phase order? I.e. as long as they are in the correct phase rotation sequence, do they care whether the correct of the three red cables coming into the substation is identified as 'red' phase?


    Or do they do a large-scale equivalent of a ring final circuit, where order would then be important?
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