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The voltage and synchronism check is performed as shown below according to the [ARC-CB]
settings:
Setting of [ARC-CB]
ONE or O1
O2
L1
L2
Note : "
" is set only when the relay is applied to one-breaker system. Trip and reclose
ONE
commands are output only for CB1(bus CB).
The energizing control for the two circuit breakers can be set by the scheme switch [VCHK] as
follows:
Setting of [VCHK]
Energizing control
LB1
The lead breaker is reclosed under the "live bus and dead line" condition or with
synchronism check, and the follower breaker is reclosed with synchronism check only.
LB2
The leader breaker is reclosed under the "live bus and dead line" condition or with
synchronism check, and the follower breaker is reclosed under the "dead bus and live
line" condition or with synchronism check.
DB
Both breakers are reclosed under the "dead bus and live line" condition or with
synchronism check.
SYN
Both breakers are reclosed with synchronism check only.
OFF
Both breakers are reclosed without voltage and synchronism check.
Multi-phase autoreclose
The scheme switch [ARC-M] is set to "MPAR2" or "MPAR3", then the busbar breaker is always
reclosed in the multi-phase autoreclose mode.
The center breaker can select three-phase autoreclose, multi-phase autoreclose or three-phase
final tripping by setting the scheme switch [ARC-CCB] shown in Figure 2.15.2.5.
When [ARC-CCB] is set to "TPAR", the logic level of CCB-SET signal becomes 1 and the
center breaker is reclosed in the three-phase autoreclose mode only after the busbar breaker is
successfully reclosed. If the voltage check condition is configured by the PLC, the energizing
control for the center breaker is dependent on the setting of the scheme switch [VCHK] as
follows.
Setting of [VCHK]
LB
DB
SYN
OFF
Note: As this three-phase autoreclose is applied only to the center breaker, the settings of the
[VCHK] is the same as that of one-breaker autoreclose.
Voltage and synchronism check
A voltage and synchronism check is performed using voltages V B and V L1 .
A voltage and synchronism check is performed using voltages V L1 and V L2 .
Since the logical level of ARC-SET is 0, a voltage and synchronism check is
performed for the busbar breaker using voltages V B and V L1 . Then, the logical level
of ARC-SET becomes 1 and a voltage and synchronism check is performed for the
center breaker using voltages V L1 and V L2 and a reclosing command is output to
the center breaker.
A voltage and synchronism check is performed for the center breaker using voltages
V L1 and V L2 . Then, the logical level of ARC-SET becomes 1 and a voltage and
synchronism check is performed for the busbar breaker using voltages V B and V L1 .
Energizing control
Reclosed under the "live bus and dead line" condition or with synchronism check.
Reclosed under the "dead bus and live line" condition or with synchronism check.
Reclosed with synchronism check only.
Reclosed without voltage and synchronism check.
128
6 F 2 S 0 8 5 0
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