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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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    Hi Broadgage, that is exactly what i had in mind, and therefore allowing me to use 2DE spacing factor in 4C5 and the ladder/clipped direct figures. I think UKPN use a GRP fibre glass walkway on their side of the trench to omit bonding and allow vent  etc.
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  • 0
    Hi Broadgage, that is exactly what i had in mind, and therefore allowing me to use 2DE spacing factor in 4C5 and the ladder/clipped direct figures. I think UKPN use a GRP fibre glass walkway on their side of the trench to omit bonding and allow vent  etc.
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