ABB Relion 670 Series Technical Reference Manual page 647

1MRK505222-UUS C
Technical reference manual
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.
initiate
AND
block start
UnsucClByCBchk = CBcheck
Pulse AR (Closing) OR
AND
52a CBclosed
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.
OR
S
AND
shot 0
R
AND
0-tUnsucCl
0
en05000786_ansi.vsd
Section 12
Control
UNSUCCL
641