Toshiba GRL100-701B Instruction Manual page 465

1. PLC setting sample for distance protection
To enable the distance protection Z1, Z2, Z3 and ZR tripping only when communication failure
and differential protection blocked in current differential protection, assign signals by PLC
function as follows:
(1) Zone 1 Trip Mode Control Circuit
First, disconnect all the default PLC settings of Zone 1 Trip Mode Control Circuit shown in Figure
T-1.1. (*)
[DIF]
+
"OFF"
Defalt setting
Communication
≥1
failure, etc. 789
DIF BLOCK DIF_OUT_
SERV
43C ON 1
And then, assign the invert signal of DIF_OUT_SERV (789) to [Z1G_BLOCK] and
[Z1S_BLOCK] by PLC as shown in Figure T-1.2.
(2) Zone 2, Zone 3 and Zone R Tripping circuit
Next, assign the invert signal of DIF_OUT_SERV (789) to [Z2G_BLOCK] to [ZRS_BLOCK] by
PLC as shown in Figure T-1.2.
Note (*): [Z1CNT] does not function, because Zone 1 Trip Mode Control Circuit is disabled
785
[Z1CNT]
Zone 1
786
+
Trip
Mode
787
Control
DIF_OUT
2015
788
Logic
: Disconnect the PLC default setting.
Figure T-1.1
due to disconnect all the PLC default settings.
 464 
Defalt setting
Z1CNT_INST 1936
Z1CNT_3PTP
1968
Z1CNT_ARCBLK
1847
Z1CNT_TPBLK
1888
1904
6 F 2 S 0 8 5 0
Z1 can trip instantaneously.
Z1_INST_TP
Z1 performs three-phase trip.
Z1_3PTP
Z1 performs final tripping for
Z1_ARC_BLOCK
all faults.
Z1G_BLOCK
Z1G trip is blocked.
Z1S_BLOCK Z1S trip is blocked.