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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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    Alan Capon:
    fiftyhertz:

    . . . Using Table 4D3 (to run to 70C) I cannot even get Trefoil 3 sets of 4 x 630mm2 (809A) cables to work . . . 


    Your cables are XLPE? Why not use the 90 degree figures -I would expect the connections at each end to be suitably rated? 




    Based on this thread and after speaking to the sales engineer for the ACB, i believe they are only rated for 70.

    https://communities.theiet.org/discussions/viewtopic/1037/26165


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  • 0
    Alan Capon:
    fiftyhertz:

    . . . Using Table 4D3 (to run to 70C) I cannot even get Trefoil 3 sets of 4 x 630mm2 (809A) cables to work . . . 


    Your cables are XLPE? Why not use the 90 degree figures -I would expect the connections at each end to be suitably rated? 




    Based on this thread and after speaking to the sales engineer for the ACB, i believe they are only rated for 70.

    https://communities.theiet.org/discussions/viewtopic/1037/26165


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