ABB REG316 4 Series Operating Instructions Manual page 304

ABB Switzerland Ltd
Fig. 3.5.26.1 Locus of the impedance measured at the gen-
erator terminals during pole slipping in relation to
the power system A
X ' : transient reactance of the generator
d
X : short-circuit reactance of the step-up transformer
T
Z : transient impedance of the power system A
S
3-266
REG 316*4 1MRB520049-Uen / Rev. F