Three Winding Transformer Impedance Calculation
Three Winding Transformer Impedance Calculation
(OP)
Hello everybody,
I need to calculate %R+ resistance and %X+ reactance values of primary-secondary, primary-tertiary and secondary-tertiary windings. Transformer information :
120/60/60 MVA
154/11/11 kV
Uk: 16%/16%/16%
Po: 40 kW
Pk: 400 kW
Io: %0.25
Please send your calculation results, formulas or any related document about this topic.
best regards,
vlk
I need to calculate %R+ resistance and %X+ reactance values of primary-secondary, primary-tertiary and secondary-tertiary windings. Transformer information :
120/60/60 MVA
154/11/11 kV
Uk: 16%/16%/16%
Po: 40 kW
Pk: 400 kW
Io: %0.25
Please send your calculation results, formulas or any related document about this topic.
best regards,
vlk






RE: Three Winding Transformer Impedance Calculation
RE: Three Winding Transformer Impedance Calculation
Zb=(Ub*Ub)/Sb where Ub:154 kV Sb:110 MVA
R1: (Psc*Un*Un)/(2.Sn*Sn) ohms
R2=R3=2R1
R1_2= R1+R2
R1_3= R1+R3
R2_3= R2+R3
R1_2(Per Unit)= R1_2/Zb
Thanks for your help
VLK