Calculate secondary fault current in transformer
Calculate secondary fault current in transformer
(OP)
Hi.
How can I calculate the fault current in the secondary of a transformer when I know the following information:
Fault infeed level 200MVA, 10.5kV fault current on primary side. Transformer is 12.5MVA, 11/3kV with 10% impedance (on rating).
How can I calculate the current on the secondary, without using the mva method, so without calculating the source impedance and adding it to the transformer impedance on a given base.
Thanks
How can I calculate the fault current in the secondary of a transformer when I know the following information:
Fault infeed level 200MVA, 10.5kV fault current on primary side. Transformer is 12.5MVA, 11/3kV with 10% impedance (on rating).
How can I calculate the current on the secondary, without using the mva method, so without calculating the source impedance and adding it to the transformer impedance on a given base.
Thanks






RE: Calculate secondary fault current in transformer
[img https://imgur.com/a/4IxWt]
PS. I don't know how to use this "add picture" thing
JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"
RE: Calculate secondary fault current in transformer
Thank you for your help
RE: Calculate secondary fault current in transformer
I never did the mathematical analysis but I know that the analogy with series / parallel circuits is valid (in reverse).
If you have elements (network, transformers, generators) in series, you must calculate Scc doing the count as 'resistances in parallel', and vice versa if you have elements in parallel
Maybe you can do the analysis and show it to us;)
Regards,
JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"
RE: Calculate secondary fault current in transformer
Thanks
RE: Calculate secondary fault current in transformer
If there is one, I do not know it.
I guess you may get it working with the expressions that I give you and their equivalents.
JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"