6 MVA generator data

[Alex68]

Dear collegues,
I must do some preliminary calculations and I'm looking for typical data of a synchronous generator:
A = 6 MVA
Vr = 11 kV
f = 50 Hz
pf = 0.8
4 poles

Could anybody provide me some indication about resistance and reactances?

Thank you very much.
Alex

 

[alehman]

Not really. It varies tremendously with the design of the machine. If you provide more information about what you are trying to do, maybe we can provide better help.

 

[Alex68]

Thanks Alehman,
I must do some load flow and short circuit calculations.
My concern is about the reactances required by IEC 60909 for the short circuit calculations. At least I need the saturated values of Xd and X"d.

Thank you in advance
Alex

 

[slavag]

Dear Alex.
I send to you some typical data :
Data for turbogenerators:
1. Subtrnsient reactance ( saturated) x"d in% 9-22 (low values for low voltage generators)
2. Transient reactance (saturated) x"d in % 14-35 ( for very large generator 40-45% 1000MVA)
3. Synch reactance (unsaturated) xd in % 140-300 (saturated value 5 to 20% lower).
4. NPS reactance x2 in % 9-22 ( in general x2=0.5(x"d+x"q) also valid for transient).
5. Zero seq reactance x0 in % 3-10
it's typical data. I check my calculation for 3 last generator: 80MVA 11kV, 25MVA 6.6kV and 5MVA 6.6kV
more or less Xd( saturated)= 220-260%, xd ( unsaturated)= 22-27%
Best Regards.
Slava

 

[Alex68]

Thank you Slava