ABB RED650 Technical Manual page 140

Section 7
Impedance protection
134
IBase. However, if current transformer saturation is detected, this criterion is
changed to residual voltage (3U0) exceeding 5% of UBase/sqrt(3) instead.
FW(Ln & LmLn)
FW(Ln & LmLn)
RV(Ln & LmLn)
TRUE (1)
FW(Ln & LmLn)
RV(Ln & LmLn)
IEC12000137 V3 EN-US
Figure 54: Connection of directional signals to Zones
DirModeZ3-5
Forward
Reverse
Line differential protection RED650 2.2 IEC
1MRK 505 394-UEN A
IEC12000137-2-en.vsd
Technical manual