Transformer fault current
Transformer fault current
(OP)
General system fault level is specified at 35kA
Part of installation involves small isolation 50kVA Tx's before dist boards for lighting & small power etc. (415/433V)
What is best way to calculate expected max fault level to be expected at secondary terminals? Z = 6%
I am looking to rate the DB's at around 16kA
Any help would be appreciated.
Thanks in advance
Peter
Part of installation involves small isolation 50kVA Tx's before dist boards for lighting & small power etc. (415/433V)
What is best way to calculate expected max fault level to be expected at secondary terminals? Z = 6%
I am looking to rate the DB's at around 16kA
Any help would be appreciated.
Thanks in advance
Peter






RE: Transformer fault current
50/(0.415*sqrt(3)*0.06)=1159A.
I wouldn't worry about complicating the calculation by trying to include a less than infinite source on the primary.
RE: Transformer fault current
I used a single phase transformer.
50kva/0.415 = 120 amps/0/06 = 2000 amps phase to phase and
about 3000 amps phase to neutral.
RE: Transformer fault current
Very helpfull
Regards
PeterP