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Transformer Tails Sizing

fiftyhertz
Hi All,


I am trying to nail down sizing the tails from the TX into a switchpanel.


I have reviewed the the information in GN1 and understand the methods of installing to get the best current sharing capabilities. 


The issue is getting reasonbly sized AWA singles.


Example: 1500KVA TX - FLC 2165A.


Using Table 4D3 (to run to 70C) I cannot even get Trefoil 3 sets of 4 x 630mm2 (809A) cables to work, due to a grouping factor of 0.54?


How is the dealt with practically?
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  • 0
    Hi UKPN,


    if I’m reading this correct your example in an enclosed trench would be 4 x 3 1C 1000mm AWA cables (rounded from 960) + 2 1000mm Neutrals.


    and for a vented trench, 3 x 3 1C 1000mm AWA + 2 1000mm neutrals.


    I would have thought both these arrangements would be impossible to terminate into an ACB.
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  • 0
    Hi UKPN,


    if I’m reading this correct your example in an enclosed trench would be 4 x 3 1C 1000mm AWA cables (rounded from 960) + 2 1000mm Neutrals.


    and for a vented trench, 3 x 3 1C 1000mm AWA + 2 1000mm neutrals.


    I would have thought both these arrangements would be impossible to terminate into an ACB.
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