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I try and calculate fault current on a system coonsisting for example a generator and line and I have basic parameters. For the generator I thought the subtransient reactance would be enough but alas! When I try now to use a Power system analysis package, it asks me for all kind of things, Xd...

Russel, beach, cucky, I have learned a great deal from this discourse. Nothing can be taken for granted in Electrical Power Engineering, Thanks guys.

Very interesting info from you guys. I considered a fault at generator terminals with X1=0.3, x2=.2 and x0=.1 then I found SLG=5 pu and 3phase symmetrical fault=3.33 pu. If I change x0 to 0.5 then SLG = 3pu. It seems that for low x0, SLG faults are worse than 3 ph bolted faults. Comments?

Which is the worst kind of fault among, Single Line to ground (SLG) , B-C fault and A-B-C-E(Earth) fault from a protection equipment point of view?

We teach automation to Diploma Students but the field is moving astronomically towards networks. Can anyone link me to documents which can simply explain this technology and where its heading? We are also interested in purchasing a "Lab bundle" similar to CISCO which can be used for training...