REG 316*4 1MRB520049-Uen / Rev. B ABB Switzerland Ltd
4-27
The reactance X
A
is set either to the synchronous reactance X
d
or a value which takes account of differing values of X
d
and X
q
.
The following general statement applies:
X
X
sin
A
=
d
X
B
= 0 in Fig. 4.13. X
B
can also be positive or negative and rep-
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
A
setting (see Fig. 4.12).
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