ABB REG316 4 Series Operating Instructions Manual page 425

REG 316*4 1MRB520049-Uen / Rev. B
The reactance X is set either to the synchronous reactance X
A
or a value which takes account of differing values of X
The following general statement applies:
X
=
X
A
d
sin
X = 0 in Fig. 4.13. X
B
resented in an impedance plane by circles which do not pass
through the origin. In a power diagram, these circles correspond
to circles to the left and right of the straight lines through points
C', A' and E'. Point A is common to all circles with the same load
angle d and the same X
can also be positive or negative and rep-
B
setting (see Fig.
A
ABB Switzerland Ltd
and X
d
4.12).
d
.
q
4-27