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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
    PVC CABLES ALUMINIUM CONDUCTORS ENCLOSED IN A CONCRETE TRENCH MINIMUM DEPTH 300mm (INCLUDING 100mm THICK TRENCH COVER) ; MINIMUM INTERNAL WIDTH 450 mm.


    TRANSFORMER RATING = 1500 kVA

    MAXIMUM DEMAND = 2087A 

    PHASE mm2 = 12 x 960 

    NEUTRAL mm2 = 2 x 960 


    50mm BETWEEN CABLES NON- ARMOURED SINGLE CORE


    IN AN OPEN CONCRETE TRENCH, NO COVER CABLE DIAMETER De


    CABLE DIAMETER SPACE BETWEEN PHASES  NON ARMOURED SINGLE CORE.


    PHASE mm2 = 9 x 960 

    NEUTRAL mm2 = 2 X 960


    Regards, UKPN





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  • 0
    PVC CABLES ALUMINIUM CONDUCTORS ENCLOSED IN A CONCRETE TRENCH MINIMUM DEPTH 300mm (INCLUDING 100mm THICK TRENCH COVER) ; MINIMUM INTERNAL WIDTH 450 mm.


    TRANSFORMER RATING = 1500 kVA

    MAXIMUM DEMAND = 2087A 

    PHASE mm2 = 12 x 960 

    NEUTRAL mm2 = 2 x 960 


    50mm BETWEEN CABLES NON- ARMOURED SINGLE CORE


    IN AN OPEN CONCRETE TRENCH, NO COVER CABLE DIAMETER De


    CABLE DIAMETER SPACE BETWEEN PHASES  NON ARMOURED SINGLE CORE.


    PHASE mm2 = 9 x 960 

    NEUTRAL mm2 = 2 X 960


    Regards, UKPN





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