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Z1CNT
Position
1
SINGLE-PHASE TRIP & AUTO-REC
2
3
4
5
6
(*): during a communication failure or when the [DIF] setting is "No use".
The zone 1 tripping mode at each position of the switch [Z1CNT] is as follows:
Position 1: When the current differential protection is in service, zone 1 executes time tripping
with a time delay using timer TZ1 and starts autoreclose. Zone 1 performs single-phase tripping
and reclosing or three-phase tripping and reclosing depending on the reclose mode of the
autoreclose function and the type of faults (single-phase faults or multi-phase faults). If the
autoreclose is out of service, zone 1 performs three-phase final tripping for all faults.
When the current differential protection is out of service, zone 1 executes performs instantaneous
single-phase tripping and reclosing or three-phase tripping and reclosing depending on the reclose
mode of the autoreclose function and the type of faults (single-phase faults or multi-phase faults).
If the autoreclose is out of service, zone 1 performs instantaneous three-phase final tripping for all
faults.
Position 2: When the current differential protection is in service, zone 1 performs three-phase
tripping with a time delay using timer TZ1 and does not start autoreclose. The zone 1 performs
instantaneous single-phase tripping and reclosing or three-phase tripping and reclosing depending
on the reclose mode of the autoreclose function and the type of faults (single-phase faults or
multi-phase faults), if the current differential protection is out of service. If the autoreclose is out
of service, zone 1 performs three-phase final tripping for all faults.
Position 3: When the current differential protection is in service, zone 1 performs three-phase
tripping with a time delay using timer TZ1 and does not start autoreclose. The zone 1 performs
three-phase tripping instantaneously and does not start autoreclose if the current differential
protection is out of service.
Position 4: Though the current differential protection is in service or out of service, zone 1
executes time tripping with a time delay using timer TZ1 and starts autoreclose. Zone 1 performs
single-phase tripping and reclosing or three-phase tripping and reclosing depending on the reclose
mode of the autoreclose function and the type of faults (single-phase faults or multi-phase faults).
If the autoreclose is out of service, zone 1 performs three-phase final tripping for all faults.
Position 5: Though the current differential protection is in service or out of service, zone 1
performs three-phase tripping with a time delay using timer TZ1 and does not start autoreclose.
Position 6: Zone 1 tripping is blocked though the current differential protection is in service or out
of service.
Zone 1 Trip Mode Control is performed using PLC default function as shown in Figure 2.3.1.6. By
changing the PLC default setting, the Z1 trip can be controlled independently of the [Z1CNT]
setting.
Table 2.3.1.1 Zone 1 Trip Mode Control
CURRENT DIFFERENTIAL PROTECTION USE OR NOT
USE
THREE-PHASE TRIP
THREE-PHASE TRIP
SINGLE-PHASE TRIP & AUTO-REC
THREE-PHASE TRIP
Z1 TRIP BLOCK
47
NO USE (*)
SINGLE-PHASE INST. TRIP & AUTO-REC
SINGLE-PHASE INST. TRIP & AUTO-REC
THREE-PHASE INST. TRIP
6 F 2 S 0 8 5 0
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