ABB RELION Series, Техническое руководство

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• 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
• "always": the
PROT_CRD
output is constantly active
1MRS758755 A
Section 9
Control functions
REC615 and RER615 645
Technical Manual