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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
    Another factor to consider if a significant distance is involved is the energy cost of cable losses.

    A loss of 1% is of course 15 KW. At current energy prices 15Kw will cost about £2 an hour.

    For a long hour load, that could be about £16,000 a year. Spending even £30,000  on larger cables would be an excellent investment with a payback of less than two years.


    Upsizing cables to reduce losses from say 2% down to 1% is well worth considering.


    Is the transformer already existing and in in place ? If not, could it be placed closer to the load to save on the huge LV cables.
Reply
  • 0
    Another factor to consider if a significant distance is involved is the energy cost of cable losses.

    A loss of 1% is of course 15 KW. At current energy prices 15Kw will cost about £2 an hour.

    For a long hour load, that could be about £16,000 a year. Spending even £30,000  on larger cables would be an excellent investment with a payback of less than two years.


    Upsizing cables to reduce losses from say 2% down to 1% is well worth considering.


    Is the transformer already existing and in in place ? If not, could it be placed closer to the load to save on the huge LV cables.
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