PREP3P
Prepare three-phase trip is usually connected to the trip block to force a coming trip to be a
three-phase one. If the function cannot make a single-phase or two-phase reclosing, the
tripping should be three-phase.
PERMIT1P
Permit single-phase trip is the inverse of PREP3P. It can be connected to a binary output relay
for connection to external protection or trip relays. In case of a total loss of auxiliary power,
the output relay drops and does not allow single-phase trip.
WFMASTER
Wait from master is used in high priority units to hold back reclosing of the low priority unit
during sequential reclosing. Refer to the recommendation for multi-breaker arrangements in
figure
103.
Other outputs
The other outputs can be connected for indication, disturbance recording, as required.
ON
OFF
BLKON
BLOCKOFF
INHIBIT
BLOCK ED
SETON
INPROGR
ACTIVE
UNSUCCL
SUCCL
CLOSECB
CBREADY
CBPOS
PLCLOST
1PT1
WFMASTER
RESET
START
THOLHOLD
READY
TRSOTF
SYNC
INPUT
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx
OR
OR
OUTPUT
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx
PROTECTION
xxxx-TRIP
ZCVPSOF-TRIP
ZMFPDIS-TRIP
SESRSYN-AUTOOK
IOM IOM
SMBRREC
IEC04000135_3_en. vsd
PERMIT1P
PREP3P
F
F
T
STARTHS
SKIPHS
F
F
TR2P
TR3P
F
T
WAIT
RSTCOUNT
F
F
3PT1
2PT1
3PT2
3PT3
3PT4
3PT5
F
IEC04000135 V4 EN-US
Figure 101: Example of I/O-signal connections at a three-phase reclosing function
Setting recommendations for multi-breaker arrangements
M12399-87 v5
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. Please refer to figure 103.
In a single breaker arrangement the setting is
Priority = None
. In a multi-breaker arrangement
the setting for the first CB, the Master, is
Priority = High
and for the other CB
Priority = Low
.
1MRK 511 358-UEN A Section 13
Control
251
Application manual
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