Generator Positive Sequence Impedance
Generator Positive Sequence Impedance
(OP)
I got my generator data as below but not sure which value to use as Gen. Positive Sequence Reactance.
1.Xd (unsaturated)=2.46pu
2.X'd (unsaturated)=0.247pu
3.X''d (unsaturated)=0.188pu
4.X'dv (saturated)=0.225pu
5.X''dv (saturated)=0.137pu
what is the difference between saturated direct axis transient reactance and unsaturated direct axis transient reactance?
Can i assume my Gen Positive Sequence Reactance as Negative Sequence Reactance?
Please advice
1.Xd (unsaturated)=2.46pu
2.X'd (unsaturated)=0.247pu
3.X''d (unsaturated)=0.188pu
4.X'dv (saturated)=0.225pu
5.X''dv (saturated)=0.137pu
what is the difference between saturated direct axis transient reactance and unsaturated direct axis transient reactance?
Can i assume my Gen Positive Sequence Reactance as Negative Sequence Reactance?
Please advice






RE: Generator Positive Sequence Impedance
The X2 is not generally exactly equal to the X1 positive sequence, but the assumption is commonly made if no additional information is available.
RE: Generator Positive Sequence Impedance
RE: Generator Positive Sequence Impedance
Generally I think the saturated is used. I think the difference is how the mfr tests the impedance. I think they get the unsaturated value by seeing how much excitation it takes to create rated current on a machine with shorted phase conductors, and hence it is at low excitation, and not too representative of normal excitation during a fault.