ABB Relion 670 series, Technical Reference Manual

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ANSI05000201-3-en.vsd
INDIR_A
DFW_A
AND
AND
INDIR_AB
DFW_AB
AND
INDIR_CA
DFW_CA
AND
INDIR_B
DFW_B
AND
INDIR_AB
DFW_BC
AND
INDIR_BC
AND
INDIR_C
DFW_C
AND
INDIR_BC
AND
INDIR_CA
OR
OR
OR
OR
AND
AND
AND
AND
AND
AND
AND
OR
OR
FWD_IPH
FWD_A
FWD_G
FWD_B
FWD_2PH
FWD_C
FWD_3PH
OR
FWD_PP
15 ms
0
15 ms
0
15 ms
0
15 ms
0
15 ms
0
15 ms
0
15 ms
0
15 ms
0
0
15 ms
0
15 ms
ANSI05000201 V3 EN
Figure 113: Composition of phase selection signals for forward direction
Figure 114 presents the composition of output signals TRIP and PICKUP, where
internal signals NDIR_PP, FWD_PP and REV_PP are the equivalent to internal signals
NDIR_G, FWD_G and REV_G, but for the phase-to-phase loops.
Section 6
1MRK505222-UUS C
Impedance protection
234
Technical reference manual