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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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  • Former Community Member
    0 Former Community Member
    It looks you are referring to  either double
    circuit DC  tower which  will have 4 conductors or
    2,  two phase supply circuits for  Railway traction .
    Generally,  Railways get supply through A and  B or B and
    C phase s of 132kv system, which is stepped  down to suit
    traction supply,   Thanks... Umesh 
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  • Former Community Member
    0 Former Community Member
    It looks you are referring to  either double
    circuit DC  tower which  will have 4 conductors or
    2,  two phase supply circuits for  Railway traction .
    Generally,  Railways get supply through A and  B or B and
    C phase s of 132kv system, which is stepped  down to suit
    traction supply,   Thanks... Umesh 
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