ABB Relion 670 Series Technical Reference Manual page 348

Section 6
Impedance protection
342
INDIR_A
AND
DFW_A
INDIR_AB
AND
DFW_AB
INDIR_CA
AND
DFW_CA
INDIR_B
AND
DFW_B
INDIR_AB
AND
INDIR_BC
AND
DFW_BC
INDIR_C
AND
DFW_C
INDIR_BC
AND
INDIR_CA
AND
ANSI05000201 V3 EN
Figure 181: Composition of phase selection signals for forward direction
Figure114 presents the composition of output signals TRIP and START, where internal
signals STNDPP, STFWPP and STRVPP are the equivalent to internal signals
STNDPE, STFWPE and STRVPE, but for the phase-to-phase loops.
AND
AND OR
OR
AND
OR
AND
OR
AND OR
AND
OR
AND
OR
1MRK505222-UUS C
FWD_IPH
15 ms 0
0 15 ms
FWD_A
0
15 ms
FWD_G
0
15 ms
FWD_B
0
15 ms
FWD_2PH
0
15 ms
15 ms
0
FWD_C
0
15 ms
FWD_3PH
0
15 ms
FWD_PP
0
15 ms
ANSI05000201-3-en.vsd
Technical reference manual