If the
Auto lockout reset
setting is not in use, the lockout can be released
only with the
RecRs
parameter.
The AR function can go to lockout for many reasons.
• The INHIBIT_RECL input is active.
• All shots have been executed and a new initiation is made (final trip).
• The time set with the
Auto wait time
parameter expires and the automatic
sequence initiation is not allowed because of a synchronization failure.
• The time set with the
Wait close time
parameter expires, that is, the circuit
breaker does not close or the automatic sequence initiation is not allowed due to
a closing failure of the circuit breaker.
• A new shot is initiated during the discrimination time.
• The time set with the
Max wait time
parameter expires, that is, the master unit
does not release the slave unit.
• The frequent operation counter limit is reached and new sequence is initiated.
The lockout is released when the recovery timer elapses.
• The protection trip signal has been active longer than the time set with the
Max
wait time
parameter since the shot initiation.
• The circuit breaker is closed manually during an autoreclosing sequence and the
manual close mode is FALSE.
9.4.4.6 Protection coordination controller
The PROT_CRD output is used for controlling the protection functions. In several
applications, such as fuse-saving applications involving down-stream fuses,
tripping and initiation of shot 1 should be fast (instantaneous or short-time
delayed). The tripping and initiation of shots 2, 3 and definite tripping time should
be delayed.
In this example, two overcurrent elements PHLPTOC and PHIPTOC are used.
PHIPTOC is given an instantaneous characteristic and PHLPTOC is given a time
delay.
The PROT_CRD output is activated, if the SHOT_PTR value is the same or higher than
the value defined with the
Protection crd limit
setting and all initialization signals
have been reset. The PROT_CRD output is reset under the following conditions:
• If the cut-out time elapses
• If the reclaim time elapses and the AR function is ready for a new sequence
• If the AR function is in lockout or disabled, that is, if the value of the
Protection
crd mode
setting is "AR inoperative" or "AR inop, CB man".
The PROT_CRD output can also be controlled with the
Protection crd mode
setting.
The setting has the following modes:
• "no condition": the PROT_CRD output is controlled only with the
Protection crd
limit
setting
• "AR inoperative": the PROT_CRD output is active, if the AR function is disabled or
in the lockout state, or if the INHIBIT_RECL input is active
• "CB close manual": the PROT_CRD output is active for the reclaim time if the
circuit breaker has been manually closed, that is, the AR function has not issued a
close command
• "AR inop, CB man": both the modes "AR inoperative" and "CB close manual" are
effective
1MRS757644 H
Control functions
620 series
Technical Manual
1025
To Next Page
Loading...
