three-single phase transformer impedance
three-single phase transformer impedance
(OP)
I have three-single phase transformer, each is rated at 250kVA, 34500-2404x7212/12490Y.
The name plate shows if the secondary side is connected in series the voltage is 7212V, 34.7Amps. If the secondary is connected in parallel the voltage is 2404V, 104 amps.
The impedance shows as 5.15% at 34500-7212 VOLTS.
The secondary side of the three-single phase transformer is connected to 2.4kV Bus.
Since, the impedance is obtained based on 34500-7212 Volts, Do I need to convert the impedance based on 34500-2404? If so, how do I convert the impedance?
Thanks.
The name plate shows if the secondary side is connected in series the voltage is 7212V, 34.7Amps. If the secondary is connected in parallel the voltage is 2404V, 104 amps.
The impedance shows as 5.15% at 34500-7212 VOLTS.
The secondary side of the three-single phase transformer is connected to 2.4kV Bus.
Since, the impedance is obtained based on 34500-7212 Volts, Do I need to convert the impedance based on 34500-2404? If so, how do I convert the impedance?
Thanks.






RE: three-single phase transformer impedance
RE: three-single phase transformer impedance
David Castor
www.cvoes.com
RE: three-single phase transformer impedance
Rafiq Bulsara
http://www.srengineersct.com
RE: three-single phase transformer impedance
RE: three-single phase transformer impedance
NbOld=150; %kVA
VbOld=7.212; %kV
NbNew= 150; %kVA
VbNew= 2.404; % kV
ZNew = ZOld * (VbOld/VbNew)^2 * (NbNew/NbOld)
ZNew => 139.50 %; ?????
RE: three-single phase transformer impedance
NbOld=150; %kVA
VbOld=7.212; %kV
NbNew= 150; %kVA
VbNew= 2.404; % kV
ZNew = ZOld * (VbOld/VbNew)^2 * (NbNew/NbOld)
ZNew => 46.35 %; ????