Application Guide - NP900 Series
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)
A996A
3.6.4.15
I
NHIBIT AND
L
OCKED STATES OF AUTORECLOSER FUNCTION
Autorecloser has several locked and inhibit states where reclosing for some given reason
cannot be allowed. When autorecloser function enters into the not ready state it will give
indication of the reason it cannot be in ready state in order to quickly rectify what is
causing the problem of the functions operation.
Inhibit reasons for autorecloser are following:
o
AR is blocked (from Blocking input)
o
AR is not enabled
o
AR is calculating lock-out delay
o
Object open or close is blocked
o
Object status is not known
o
General reclaim time is running
o
AR is locked
When AR is in inhibit state it will recover to ready state when the reason for the inhibition
is removed.
Lock-out reasons for autorecloser are following:
o
Lock down signal is init (from Lockdown input)
o
Final Trip signal is given
o
Object not ready failed in given time (from Object)
o
Object no sync failed in given time (from Object)
o
Object open timeout (from Object)
o
Object close timeout (from Object)
o
AR request init during General reclaim time
o
AR request was not released during Dead Time
o
Critical request init in any state of autoreclosing cycle
When AR is in Locked state it can be recovered only by user input either from manual
reset input or by closing the breaker manually. This depends of the configuration which
way is required to reset the autorecloser.
