ANSI C37.010 1979 says to apply the AC decrement to short circuit current when the current is fed predominately from generators through:
-Not more than one transformation
or
-A per-unit reactance external to the generator which is less than 1.5 times the generator p.u. subtransient reactance...
I've read Thread238-21974 and I think this may be useful for shunt reactors, I was curious if there are some ballpark numbers for estimating zero sequence impedance given positive sequence impedance.
Specifically, we are installing a 1.75 ohm reactor at 34.5kV. We are modeling it on a 100 MVA...