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DC HV transmission

Michael Wrigley
May I ask for a bit of advice, purely from personal interest?

When one sees a HV transmission line with four conductors, one can be pretty sure it's DC, probably for the railways. First question: why four conductors and not two? Second question: do DC lines exist with two or six conductors? How would I recognise this?

Many thanks
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  • 0
    I think that, if this were the case, they wouldn't have used HV insulators.
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  • 0
    I think that, if this were the case, they wouldn't have used HV insulators.
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