AN/AF Dry type transformer secondary fault level
AN/AF Dry type transformer secondary fault level
(OP)
Dear all,
Dry type transformer usually has two capacity AN and AF. For example, 1MVA and 1.5MVA with fan operating. When we calculate the secondary short circuit current, what capacity should be used? 1MVA or 1.5MVA? Is there any relevent document?
Thanks,
Paulpower
Dry type transformer usually has two capacity AN and AF. For example, 1MVA and 1.5MVA with fan operating. When we calculate the secondary short circuit current, what capacity should be used? 1MVA or 1.5MVA? Is there any relevent document?
Thanks,
Paulpower






RE: AN/AF Dry type transformer secondary fault level
RE: AN/AF Dry type transformer secondary fault level
I will ask manufacturer to provide impedance data at AF rating and compare two results at different rating.
If the calculated fault level is 60KA, can I specify the CB interrupting capacity at 65KA or shall I specify the capacity at 85KA or 100KA for redundancy?
RE: AN/AF Dry type transformer secondary fault level
As for what breaker rating to use, well, it depends...