hardwired, or carried out by means of communication. There are also different
alternatives regarding what shall generate Lock-out. Examples of questions are:
• Shall back-up time delayed trip give Lock-out (normally yes)
• Shall Lock-out be generated when closing onto a fault (mostly)
• Shall Lock-out be generated when the Auto-Recloser was OFF at the fault
• Shall Lock-out be generated if the Breaker did not have sufficient operating
power for an auto-reclosing sequence (normally not as no closing attempt has
been given)
In figures
87 and 88 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
CLOSE COMMAND
OR
SMBRREC
OR
CCRBRF
BJ-TRIP
ZCVPSOF-TRIP
INHIBIT
UNSUCCL
TRBU
IEC09000159-2-en.vsd
IEC09000159 V2 EN
Figure 87: Lock-out arranged with an external Lock-out relay
1MRK 505 291-UEN A Section 10
Control
203
Application manual
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