ABB RELION REX640 Technical Manual page 955

1MRS759142 F
impedance defined by the
area GFC settings.
The underimpedance characteristics in case of phase-to-earth measuring elements
are illustrated in
phase-to-phase measuring elements with independent settings.
X Gnd Fwd reach GFC
X Gnd Rv reach GFC
Figure 529: Circular mho underimpedance characteristics
X Gnd Fwd reach GFC
X Gnd Rv reach GFC
Figure 530: Quadrilateral underimpedance characteristics
Table 914: Conversion from element start to monitored data signals
Start of element
Z < &
A
EARTH_FLT
Z < &
B
EARTH_FLT
Z < &
C
EARTH_FLT
Z
AB
Z
BC
Z
CA
Table continues on the next page
REX640
Technical Manual
Figure 529
X
Fault detected
X
Fault detected
Ris Gnd Rv Rch GFC Ris Gnd Fwd Rch GFC
<
<
<
Ris Fwd Rch Lod GFC, Ris Rv Rch Lod GFC and Angle load
Figure 530
and . Similar characteristics apply also to
Angle load area GFC
R
Ris Rv Rch Load GFC
Angle load area GFC
R
Ris Rv Rch load GFC
START_GFC STARTS_GF
C
TRUE AG Fault
TRUE BG Fault
TRUE CG Fault
TRUE AB Fault
TRUE BC Fault
TRUE CA Fault
Protection functions
X
Fault detected
Angle load area GFC
R
Ris Fwd Rch Load GFC
X
Fault detected
Angle load area GFC
R
Ris Fwd Rch load GFC
RELEASE_P
E
AG Fault
BG Fault
CG Fault
No fault
No fault
No fault
RELEASE_P
P
No fault
No fault
No fault
AB Fault
BC Fault
CA Fault
955