ABB 615 Series - Page 398

The combined overconductance and oversusceptance criterion is applicable in high-
resistance grounded, ungrounded and compensated networks or in the systems where the
system grounding may temporarily change during normal operation from compensated to
ungrounded system.
Re(Yo)
Im(Yo)
Susceptanceforward
TRIPTRIP
Conductanceforward
ConductancetiltAng>0
TRIP
Re(Yo)
Im(Yo)
Susceptanceforward
TRIP
TRIP
Conductanceforward
TRIP
SusceptancetiltAng<0
GUID-60D007C4-2B08-41FC-A30B-580B3DF37361 V1 EN
Figure 186: Combined forward directional overconductance and forward directional
oversusceptance characteristic. Left figure: the Conductance tilt Ang and
Susceptance tilt Ang settings equal zero degrees. Right figure: the
setting Conductance tilt Ang > 0 degrees and the setting Susceptance tilt
Ang < 0 degrees.
Section 4 1MAC059074-MB A
Protection functions
392 615 series ANSI
Technical Manual