ON
OFF
BLKON
BLKOFF
INHIBIT
BLOCKED
SETON
INPROGR
ACTIVE
UNSUCCL
SUCCL
CLOSECB
PERMIT1P
CBREADY
CBCLOSED
PLCLOST
3PT1
WFMA STER
RESET
ST ART
1PT1
2PT1
TRSOTF
TR2P
TR3P
SYNC
INPUT
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx
OR
OUTPUT
xx
OR
PROTECT ION
xxxx-TRIP
ZCVPSOF-TRIP
TRIP-TR2P
TRIP-TR3P
SESRSYN-AUTOOK
EF4PTOC-BLOCK
BIM BOM
SMBRREC
=IEC04000136=4=en=Original.vsd
xx
xx
xx
xx
xx
xx
xx
xx
xx
STARTHS
SKIPHS
THOLHOLD
WAIT
RSTCOUNT
3PT2
3PT3
3PT4
3PT5
READY
PREP3P
TRIP-P3PTR
IEC04000136 V4 EN-US
Figure 135: Example of I/O-signal connections for a single-phase, two-phase or three-
phase auto reclosing sequence
Setting recommendations for multi-breaker arrangements
M12399-87 v6
Sequential reclosing in multi-breaker arrangements, like 1 1/2-breaker, double breaker and ring
bus, is achieved by giving the two line breakers different priorities. Refer to figure 136. In a
single breaker arrangement the setting is
Priority = None
. In a multi-breaker arrangement the
setting for the first circuit breaker, the master, is
Priority = High
and for the other circuit
breaker
Priority = Low
.
While the auto reclosing of the master is in progress, it issues the
WFMASTER
output. After an
unsuccessful reclosing the
WFMASTER
output is also maintained by the
UNSUCCL
signal. When
activating the
WAIT
input, in the auto recloser set as slave, every dead timer is changed to the
value of setting
tSlaveDeadTime
and holds back the auto reclosing operation. When the
WAIT
input is reset at the time of a successful reclosing of the first circuit breaker, the slave is
released to continue the reclosing sequence after the set
tSlaveDeadTime
. The reason for
shortening the time, for the normal dead timers with the value of
tSlaveDeadTime
, is to give
the slave permission to react almost immediately when the
WAIT
input resets. The mimimum
settable time for
tSlaveDeadTime
is 0.1sec because both master and slave should not send the
breaker closing command at the same time. The slave should take the duration of the breaker
closing time of the master into consideration before sending the breaker closing command. A
setting
tWaitForMaster
sets a maximum wait time for the
WAIT
input to reset. If the wait time
expires, the reclosing cycle of the slave is inhibited. If auto reclosing of the first breaker is
unsuccessful, the
UNSUCCL
output connected to the
INHIBIT
input of the slave unit interrupts
the auto reclosing sequence of the latter.
1MRK 505 370-UEN D Section 12
Control
Busbar protection REB670 279
Application manual
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