ABB REG650 Technical Manual page 165

1MRK 502 048-UEN A
Positive
sequence
current
phasor
Positive
Apparent
sequence
impedance
voltage
calculation
phasor
Dir.Restrain ON
IEC06000458 V3 EN
Figure 74: Simplified logic diagram of LEXPDIS protection
Technical manual
XoffsetDirLine
IEC06000457 V1 EN
Figure 73: Impedance constructed as XoffsetDirLine in LEXPDIS protection
LEXPDIS function is schematically described in figure 74.
Z in
Z1 char.
Z
Z in
Z2 char.
Dir.
Restrain
X
Underexcitation Protection
Restrain area
DirAngle
Z (apparent impedance)
³1
Section 7
Impedance protection
R
en06000457.vsd
tZ1
startZ1 t TripZ1
&
tZ2
startZ2 t TripZ2
&
en06000458-2.vsd
159