Simplified Logic Diagrams - ABB Relion 670 Series Technical Reference Manual

1MRK505222-UUS C
6.10.2.6
Technical reference manual

Simplified logic diagrams

Figure 110 presents schematically the creation of the phase-to-phase and phase-to-
ground operating conditions. Consider only the corresponding part of measuring and
logic circuits, when only a phase-to-ground or phase-to-phase measurement is
available within the IED.
³ ×
3 I 0.5 IMinPUPG
0
3 0 I Enable PG _
³ ×
3 I Iph
0
100
BLOCK
<
3I IMinPUPG
0
3 0 I BLK _ PP
< ×
3 I Iph
0 max
100
ANSI09000149 V2 EN
Figure 178: Phase-to-phase and phase-to-ground operating conditions (residual
current criteria)
A special attention is paid to correct phase selection at evolving faults. A PHSEL
output signal is created as a combination of the load encroachment characteristic and
current criteria, refer to figure 110. This signal can be configured to STCND functional
input signals of the distance protection zone and this way influence the operation of the
phase-to-phase and phase-to-ground zone measuring elements and their phase related
pickup and tripping signals.
Figure 111 presents schematically the composition of non-directional phase selective
signals NDIR_A (B or C). Internal signals ZMn and ZMmn (m and n change between
A, B and C according to the phase) represent the fulfilled operating criteria for each
separate loop measuring element, that is within the characteristic.
Load encroachment block
AND
max
AND
10ms 0
AND
20ms
0
Section 6
Impedance protection
IRELPG
STPG
0
15ms
DLECND
Bool to
AND
integer
STPP
0
15ms
IRELPP
ANSI09000149-2-en.vsd
339