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Ze & Ipscc

Frankie 223
I am preparing an electrical model for a project and have asked ukpn to confirm the Ze, Ipscc and Z% of the transformer so I can input the data in the software.


I got the following figures back which I am not sure I understand:

Ze=0.15

Ipscc=32kA

Z for the 11kV/400V 1.5MVA Tx 5.5%


Based on the Tx Z and Ipscc I would expect a much lower Ze. Am I missing something or do you think that the above figures make sense?
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  • 0
    Thank you for your responses.


    Even if these are worst case scenario I would expect a lower value for the Ze. Ze @ 0.15 would give me around 1.5kA fault which is less than the flc of around 2165A??


    John, thats what confused me. With 5.5% Z on the Tx I would expect the Ipscc to be around 39kA and the Ze around 0.007.
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  • 0
    Thank you for your responses.


    Even if these are worst case scenario I would expect a lower value for the Ze. Ze @ 0.15 would give me around 1.5kA fault which is less than the flc of around 2165A??


    John, thats what confused me. With 5.5% Z on the Tx I would expect the Ipscc to be around 39kA and the Ze around 0.007.
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