48
6
F
2
S
0
8
5
0
DIF_OUT_
SERV
Z1CNT_INST
+
43C ON
[Z1CNT]
Z1_INST_TP
1936
785
786
787
788
Z1CNT_3PTP
Z1CNT_ARCBLK
Z1CNT_TPBLK
Z1_3PTP
1968
Z1_ARC_BLOCK
1847
Z1G_BLOCK
1888
Z1S_BLOCK
1904
Z1 can trip instantaneously.
Z1 performs three-phase trip.
Z1 performs final tripping
for all faults.
Z1G trip is blocked.
Z1S trip is blocked.
Defalt setting
DIF_OUT
2015
Trip
Mode
Control
Logic
Zone 1
1
≥
1
789
DIF BLOCK
Communication
failure, etc.
+
[DIF]
"OFF"
Defalt setting
From
Figure
2.2.2.1.
Figure 2.3.1.6 Zone 1 Trip Mode Control Circuit
If the distance protection is active only when communication failure in the GRL100, it is achieved
by the PLC function. See Appendix S.
Zone 1 tripping is provided with an additional phase selection element UVC and phase selection
logic to make sure the faulted phase is selected for the single-phase earth fault.
Figure 2.3.1.7 gives details of the phase selection logic in Figure 2.3.1.5. In case of single-phase
earth fault, the earth fault measuring zone 1 element Z1G with a certain phase and the phase
selection element UVC with the same phase operate together, and a single-phase tripping
command S-TRIP can be output to the phase.
&
UVC - C
UVC - B
UVC - A
Z1G - C
Z1G - B
Z1G - A
≥
1
Z1S-BC
Z1S-AB
C
B
A
&
&
&
Z1S-CA
S-TRIP
M-TRIP
560
561
562
EFL
UVPWI-C
UVPWI-B
UVPWI-A
631
632
633
634
608
609
610
575
576
577
≥
1
&
&
&
Z3G - C
Z3G - B
Z3G - A
566
567
568
≥
1
&
&
&
Figure 2.3.1.7 Phase Selection Logic for Zone 1 Protection
Depending on the setting of the scheme switch [Z1CNT] or [ARC-M] which selects reclosing
mode, single-phase tripping may be converted to a three-phase tripping command. This is not
shown in the figure.
In case of multi-phase fault, the phase fault measuring zone 1 element Z1S and the two phases of
the UVC operate together, the Z1G trip is blocked and the three-phase tripping command M-TRIP
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Summary of Contents for GRL100-701B
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