In figures 99 and 100 the logic shows how a closing Lock-out logic can be designed with the
Lock-out relay as an external relay alternatively with the Lock-out created internally with the
manual closing going through the Synchro-check function. An example of Lock-out logic.
Lock-out
RXMD1
11
12
21
MAIN ZAK CLOSE
CLOSE COMMAND
SMBO
OR
SMBRREC
OR
CCRBRF
BU-TRIP
ZCVPSOF-TRIP
INHIBIT
UNSUCCL
TRBU
IEC05000315-4-en.vsd
IEC05000315-WMF V4 EN-US
Figure 99: Lock-out arranged with an external Lock-out relay
CLOSE COMMAND
OR
SMBRREC
OR
CCRBRF
BU-TRIP
ZCVPSOF-TRIP
INHIBIT
UNSUCCL
TRBU
SMPPTRC
AND
RESET LOCK-OUT
OR
OR
SESRSYN
Functional key,
SOFTWARE
OR IO RESET
MANSYOK
MAN CLOSE
SMBRREC CLOSE
CLLKOUT
RSTLOUT
SETLKOUT
IEC05000316-3-en.vsd
SMBO
MANENOK
IEC05000316-WMF V3 EN-US
Figure 100: Lock-out arranged with internal logic with manual closing going through in
IED
13.2.2.20 Evolving fault
M12391-217 v3
An evolving fault starts as a single-phase fault which leads to single-phase tripping and then
the fault spreads to another phase. The second fault is then cleared by three-phase tripping.
The Auto-Reclosing function will first receive a trip and start signal (START) without any three-
phase signal (TR3P). The Auto-Reclosing function will start a single-phase reclosing, if
programmed to do so. At the evolving fault clearance there will be a new signal START and
three-phase trip information, TR3P. The single-phase reclosing sequence will then be stopped,
and instead the timer,
t1 3Ph
, for three-phase reclosing will be started from zero. The sequence
will continue as a three-phase reclosing sequence, if it is a selected alternative reclosing mode.
The second fault which can be single phase is tripped three phase because trip module (TR) in
the IED has an evolving fault timer which ensures that second fault is always tripped three
phase. For other types of relays where the relays do not include this function the output
PREP3PH (or the inverted PERMIT1PH) is used to prepare the other sub-system for three phase
1MRK 511 358-UEN A Section 13
Control
247
Application manual
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