ANSI09000149-4-en.vsd
AND
AND
AND
Bool to
integer
DLECND
STPG
STPP
IRELPG
IRELPP
BLOCK
AND
0
20ms
0
10ms
0
15ms
0
15ms
0
3IIMinPUPG
0max
30 _
3
100
IBLK PP
IIph
0
30.5IIMinPUPG
0
30 _
3
100
max
I Enable PG
IIph
21 enable
LDEblock
AND
ANSI09000149 V4 EN-US
Figure 142: 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
142. 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
143 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.
Section 7 1MRK 502 066-UUS B
Impedance protection
286
Technical manual
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