30
6
F
2
S
0
8
3
4
Trip
Mode
Control
Logic
CRT USE
Z1CNT_INST
+
[Z1CNT]
Z1_INST_TP
1696
712
713
714
715
Zone 1
Z1CNT_3PTP
Z1CNT_ARCBLK
Z1CNT_TPBLK
Z1_3PTP
1712
Z1_ARC_BLOCK
1655
Z1G_BLOCK
1616
Z1S_BLOCK
1632
Z1 can trip instantaneously.
Z1 performs three-phase trip.
Z1 performs final tripping for all faults.
Z1G trip is blocked..
Z1S trip is blocked.
Default setting
Figure 2.4.1.7 Zone 1 Trip Mode Control Circuit
When zone 1 extension is used, normal zone 1 tripping is blocked. However, the blocking is
released by an autoreclose command that follows zone 1 extension tripping. Final tripping to the
reclose-on-to-permanent-fault is performed under the time-stepped distance protection including
zone 1.
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 2.4.1.8 gives details of the phase selection logic in Figure 2.4.1.5. 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
19
20
21
EFL
UVPWI-C
UVPWI-B
UVPWI-A
362
363
364
568
66
67
68
34
35
36
≥
1
&
&
&
Z3G - C
Z3G - B
Z3G - A
28
29
30
≥
1
&
&
&
Figure 2.4.1.8 Phase Selection Logic for Zone 1 Protection
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