46
6
F
2
S
0
8
5
0
tripping can be disabled by the scheme switches [Z1CNT] and [Z
∗
TP].
Note:
For the symbols used in the scheme logic, see Appendix L.
S-TRIP
&
Trip
mode
control
M-TRIP
TZ2G
t
0
&
Z1G
Z2G
Phase
selection
logic
Sigle-phase
tripping
command
0.00 - 10.00s
[PSB-Z1]
PSBG_DET
+
[Z2TP]
[PSB-Z2]
NON VTF
Three-phase
tripping
command
TZ1G
t
0
0.00 - 10.00s
&
Z1S
"ON"
[PSB-Z1]
TZ1S
t
0
0.00 - 10.00s
Z2G_BLOCK
1890
TZ2S
t
0
&
0.00 - 10.00s
"ON"
"ON"
Z2S
[PSB-Z2]
Z2S_BLOCK
1906
"ON"
≥
1
"ON"
TZ3G
t
0
&
Z3G
0.00 - 10.00s
+
[Z3TP]
[PSB-Z3]
Z3G_BLOCK
1891
TZ3S
t
0
&
0.00 - 10.00s
"ON"
Z3S
[PSB-Z3]
Z3S_BLOCK
1907
"ON"
"ON"
TZRG
t
0
&
ZRG
0.00 - 10.00s
+
[ZRTP]
[PSB-ZR]
ZRG_BLOCK
1894
TZRS
t
0
&
0.00 - 10.00s
"ON"
ZRS
[PSB-ZR]
ZRS_BLOCK
1910
"ON"
"ON"
PSBS_DET
circuit
Figure 2.3.1.5 Scheme Logic of Time-stepped Distance Protection
Tripping by each zone can be blocked the PLC signal Z
∗∗
_BLOCK. The tripping can be also
blocked in the event of a failure of the secondary circuit of the voltage transformer or power
swing. The former is detected by the VT failure detection function. The signal VTF becomes 1
when a failure is detected. The latter is detected by the power swing blocking function. The signal
PSB becomes 1 when power swing is detected. The zone in which tripping will be blocked during
a power swing can be set using the selection switches [PSB-Z1] to [PSB-ZR]. For the VTF and
PSB, see Section 2.3.3 and Section 3.3.5, respectively.
By using the trip mode control logic, Zone 1 can implement different trip modes. The trip modes
as shown in Table 2.3.1.1 can be selected according to the position of the scheme switch [Z1CNT]
and whether or not the differential protection is in or out of service.
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Summary of Contents for GRL100-701B
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