transformer bank
transformer bank
(OP)
If I'm considering a 3 phase transformer bank (made from 3 single phase transformers -> 25kV - 120/208 V, 50kVA, Z=2%, wye-wye), how would I model such a thing as one unit ?
(i.e. what would the impedance be, if I were modeling the above as a 3 phase transformer for computer simulations ?).
Thanks in advance
(i.e. what would the impedance be, if I were modeling the above as a 3 phase transformer for computer simulations ?).
Thanks in advance






RE: transformer bank
Think of it this way:
120=I*Zt1-ph
208=I*Zt3-ph
Either way, the transformer current I is the same; that means Zt3 = Zt1 * sqrt(3).
But with per unit,
1pu=1pu*Ztpu (regardless of voltage).
Note that the conversion from %Z to Zpu will change, though, as the kVA base and transformer kVA change from 1-phase to 3-phase calcs.
RE: transformer bank
RE: transformer bank
RE: transformer bank
RE: transformer bank
I can see with a wye-wye connection that the line to neutral voltage divided by rated current is impedance, but with delta-delta, there isn't a neutral.
RE: transformer bank