28
6
F
2
S
0
8
3
4
S-TRIP
&
≥
1
Trip
mode
control
logic
M-TRIP
TZ2
t
0
TZ3
t
0
TZF
t
0
&
&
&
Z1
Z2
Z3
ZF
" ON "
" ON "
" ON "
CRT USE
Phase
selection
logic
Sigle-phase
tripping
command
0.00 - 10.00s
0.00 - 10.00s
0.00 - 10.00s
[PSB-Z3]
[PSB-Z2]
[PSB-Z1]
TZND
t
0
&
PSB
ZND
0.00 - 10.00s
+
[ZFBT]
" ON "
[PSB-ZF]
TZR1
t
0
&
ZR1
0.00 - 10.00s
+
[ZR1BT]
" ON "
[PSB-ZR1]
TZR2
t
0
&
ZR2
NON VTF
0.00 - 10.00s
+
[ZR2BT]
" ON "
[PSB-ZR2]
+
[ZNDBT]
" ON "
Three-phase
tripping
command
M-PROT_ON
1550
TZ1
t
0
0.00 - 10.00s
ON
ON
ON
Figure 2.4.1.5 Scheme Logic of Time-stepped Distance Protection
Tripping by each zone can be blocked the binary input signal (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-ZR2]. For zone ND backup tripping, power swing blocking is inhibited. For the VTF and
PSB, see Section 2.4.12 and Section 2.4.13, respectively.
By using the trip mode control logic, Zone 1 can implement different trip modes. The trip modes
as shown in Table 2.4.1.1 can be selected according to the position of the scheme switch [Z1CNT]
and whether or not the command protection is in or out of service.
Note:
When permissive underreach protection is applied as the command protection, instantaneous
tripping is required for zone 1 and autoreclose must be started. Therefore, position 1 or 4 must be
selected for [Z1CNT].
The service condition of the command protection is judged by the service condition of the
telecommunication and the main protection. The telecommunication in-service signal CRT_USE
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Summary of Contents for GRZ100-211B
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