ABB REG316 4 Series - Page 200

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-162
Typical settings:
XA-Setting according to application
e.g. -2.0
XB-Setting according to application
e.g. -0.13
Phase-angle (delta-connected v.t’s) +30°
Tripping delay timer:
Delay 2 s
or separate integrator (“Delay” function):
Trip-Delay 6 s
Reset-Delay 3 s
HEST 905 021 C
E
U
S
0
Steady-state stability
limit curve
Characteristic of the
underexcitation function
Step-up
transformer
T
x
d
2
x'
d
x
settings [U / I ]
NN
x - generator synchronous reactance [p.u.]
d
x - transformater short-circuit reactance [p.u.]
T
d
x
T
x
x
r
XA set
XB set
XA-Setting
XB-Setting
Fig. 3.5.14.3 Setting the characteristic of the underexcitation
function according to the steady-state stability
limit curve of the generator/transformer set
All reactances in p.u.