ABB 615 Series ANSI, Technical Manual

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Section 7
1MAC050144-MB C
Control functions
498 615 series ANSI
Technical Manual
• The function is reset through communication with the RsRec parameter
• The lockout is automatically reset after the reclaim time, if the Auto lockout reset
setting is in use.
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 autoreclose sequence and the manual
close mode is FALSE.
7.2.4.6 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 51P and 50P-2 are used. 50P-2 is given an
instantaneous characteristic and 51P is given a time delay.
The
PROT_CRD
output is activated, if the
SHOT_PTR
value is 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
If the Auto lockout reset setting is not in use, the lockout can be released
only with the RsRec parameter.