ABB REQ650 - Page 212

TRSOTF
This is the signal “Trip by Switch Onto Fault”. It is usually connected to the “switch
onto fault” output of line protection if multi-shot Auto-Reclose attempts are used. The
input will start the shots 2-5. For single shot applications the input is set to FALSE.
THOLHOLD
Signal “Thermal overload protection holding back Auto-Reclosing”. It is normally set
to FALSE. It can be connected to a thermal overload protection trip signal which
resets only when the thermal content has gone down to an acceptable level, for
example, 70%. As long as the signal is high, indicating that the line is hot, the Auto-
Reclosing is held back. When the signal resets, a reclosing cycle will continue. Please
observe that this have a considerable delay. Input can also be used for other purposes
if for some reason the Auto-Reclose shot is halted.
WAIT
Used to hold back reclosing of the “low priority unit” during sequential reclosing. See
“Recommendation for multi-breaker arrangement” below. The signal is activated
from output WFMASTER on the second breaker Auto-Recloser in multi-breaker
arrangements.
BLKON
Used to block the autorecloser for 3-phase operation (SMBRREC) function for
example, when certain special service conditions arise. Input is normally set to
FALSE. When used, blocking must be reset with BLOCKOFF.
BLOCKOFF
Used to Unblock SMBRREC function when it has gone to Block due to activating
input BLKON or by an unsuccessful Auto-Reclose attempt if the
settingBlockByUnsucCl is set to On. Input is normally set to FALSE.
RESET
Used to Reset SMBRREC to start condition. Possible Thermal overload Hold will be
reset. Positions, setting On-Off. will be started and checked with set times. Input is
normally set to FALSE.
Recommendations for output signals
Please see figure
89.
SETON
Indicates that Autorecloser for 3-phase operation (SMBRREC) function is switched
on and operative.
BLOCKED
Indicates that SMRREC function is temporarily or permanently blocked.
Section 10 1MRK 505 291-UEN A
Control
206
Application manual