ABB Relion Technical Manual page 382

Section 12
Control
376
execute command
phase A open
close
phase B open
close
open
phase C
close
command termination
phase A
command termination
phase B
command termination
phase C
command termination
circuit breaker open
close
tExecutionFB
timer
* The command termination will be delayed one execution sample.
ANSI05000094 V1 EN
Figure 176: tExecutionFB
The parameter tSynchrocheck is used to define the maximum allowed time between the
execute command and the input SYNC_OK to become true. If SYNC_OK=true at the
time the execute command signal is received, the timer "tSynchrocheck" will not start.
The start signal for the synchronizing is obtained if the synchronism-check conditions are
not fulfilled.
execute command
SYNC_OK
tSynchrocheck
START_SY
SY_INPRO
tSynchronizing
ANSI05000095 V1 EN
Figure 177: tSynchroCheck and tSynchronizing
*
t1
t1
t2
en05000095_ansi.vsd
1MRK 502 048-UUS A
t1>tExecutionFB, then
long-operation-time in
'cause' is set
en05000094_ansi.vsd
t2>tSynchronizing, then
blocked-by-synchronism
check in 'cause' is set
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