ABB REG316 4 Series Operating Instructions Manual page 197

REG 316*4 1MRB520049-Uen / Rev. F
The reactances X
A
to-phase voltages and calculated for turboalternators as follows:
U
GN
= ´
X x
A d
3 I
GN
x ' U
d GN
=
X
B
2
3 I
GN
In the above equation, x
I
N 1
=
K
i
I
N2
U
N 1
I
3
N 1
= =
K
u
U
I
N2
N2
3
where:
x , x ' unsaturated synchronous reactance and satu-
d d
rated transient reactance of the generator in p.u.
x synchronous reactance in p.u.
q
U , I rated generator voltage and current
GN GN
K c.t. ratio
i
K v.t. ratio
u
U , U v.t. rated voltages
N1 N2
I , I c.t. rated currents
N1 N2
and X , are defined according to the phase-
B
K
i
´
3
K
u
K
i
´
3
K
u
is replaced by x
q
ABB Switzerland Ltd
for salient pole units.
d
3-159