Permanent fault and reclosing unsuccessful signal
If a new trip occurs after the CB closing command, and a new input signal RI or
TRSOTF appears, the output UNSUCCL (unsuccessful closing) is set high. The timers
for the first shot can no longer be started. Depending on the setting for the number of
reclosing shots, further shots may be made or the reclosing sequence will be ended.
After the reset time has elapsed, the auto-reclosing function resets but the CB remains
open. The CB closed data at the 52a input will be missing. Because of this, the
reclosing function will not be ready for a new reclosing cycle.
Normally the signal UNSUCCL appears when a new trip and initiate is received after
the last reclosing shot has been made and the auto-reclosing function is blocked. The
signal resets once the reset time has elapsed. The “unsuccessful“ signal can also be
made to depend on CB position input. The parameter
UnsucClByCBChk
should then be
set to
CBCheck
, and a timer
tUnsucCl
should also be set. If the CB does not respond to
the closing command and does not close, but remains open, the output UNSUCCL is
set high after time
tUnsucCl
.
AND
OR
AND
S
AND
0
0-tUnsucCl
AND
OR
en05000786_ansi.vsd
initiate
block start
UnsucClByCBchk = CBcheck
UNSUCCL
shot 0
Pulse AR (Closing)
52a
CBclosed
R
ANSI05000786 V1 EN
Figure 319:
Issue of signal UNSUCCL, unsuccessful reclosing
Automatic continuation of the reclosing sequence
The auto-reclosing function can be programmed to proceed to the following reclosing
shots (if selected) even if the initiate signals are not received from the protection
functions, but the breaker is still not closed. This is done by setting parameter
AutoCont
=
Enabled
and to the required delay for the function to proceed without a
new initiate.
1MRK505222-UUS C
Section 12
Control
641
Technical reference manual
Summary of Contents for Relion 670 series
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