ABB Relion REC615, Техническое руководство

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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
1MRS758755 C Control functions
REC615 & RER615
Technical Manual
669