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Parallel TX Tails - Neutral Arrangement

MW (aka Inrush - for those who remember me!)
So this is the new look forum... Impressive!


I have a question regarding AWA transformer tails. I'm looking at a situation where I need three parallel cables per phase.


My question is related to the neutral conductor arrangement. The neutrals need to be installed between the inter-group trefoils in order to maintain equal current sharing. Therefore, I can either have two neutral conductors of slightly larger CSA to give approx. the same CSA as the overall parallel phase conductors. Or, alternatively, three neutrals of the same CSA as the phase conductors split (oddly) between the two groups.


What convention is normally adopted in this situation?


Many thanks in advance.
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    I would use 3no Quadrafoil Groups - you don't say what ampacity you want but for up to say 2.0MVA the quadrafoil would be easiest for you


    Google that and look for Ellis Patents cable cleats


    For each of the 3 groups try and contra rotate the phase conductors - each group of 4 contains L1, L2, L3 and N


    Regards


    OMS




    So there is no problem with having a neutral on the outside of the last group? The reason for the question is IET GN 6 implies the neutrals should only be installed between groups. Therefore, this would only allow two neutrals for three groups, if you follow?


Reply
  • 0

    I would use 3no Quadrafoil Groups - you don't say what ampacity you want but for up to say 2.0MVA the quadrafoil would be easiest for you


    Google that and look for Ellis Patents cable cleats


    For each of the 3 groups try and contra rotate the phase conductors - each group of 4 contains L1, L2, L3 and N


    Regards


    OMS




    So there is no problem with having a neutral on the outside of the last group? The reason for the question is IET GN 6 implies the neutrals should only be installed between groups. Therefore, this would only allow two neutrals for three groups, if you follow?


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