Woodward highprotec MRI4, User Manual

Page: 519 / 727

Protective Elements
No trip from current (assigned) AR initiate function(s)
No general tipping command
Before issuing the breaker reclosing command, the current shot counter will be incremented. This is very important
for the shot-controlled initiate and blocking functions.
Before entering into the »R
ECLOSING
« state, the preset breaker reclosing supervision timer (» t-Brk-ON-cmd«) will be
started, too.
15 Reclosing
If there is no other blocking or lockout conditions and the breaker is closed while the breaker reclosing supervision
timer is timing, the autoreclosure starts the »
t-Run2Ready« timer and goes into the state:
»
T
-R
UN
2R
EADY
«.
16 t-Run2Ready
Successful Autoreclosure:
While in »
T
-R
UN
2R
EADY
« state, if there is no other blocking or lockout conditions and no more faults detected within
the » t-Run2Ready« timer, the autoreclosure logic will leave the »R
UN
« state and goes back to the »R
EADY
« state.
The flag “successful” is set.
Unsuccessful Autoreclose:
If a fault is detected again (the shot-controlled initiate function is triggering) while »
t-Run2Ready« timer is still timing,
the autoreclosure control transfers to the »R
UNNING
« state again. For a permanent fault, the process described
before will be repeated until all programmed shots were operated and the autoreclose process changes into the
»L
OCKOUT
« state. The flag “failed” is set.
519 MRI4 DOK-HB-MRI4-2E