ABB REC670 Applications Manual page 345

1MRK 511 401-UUS A
Bay control REC670 2.2 ANSI
Application manual
The signal is required for three-phase shots 1-5 to proceed (Note! Not the high-speed
step).
THOLHOLD
Signal "Thermal overload protection holding back auto reclosing". It can be connected
to a thermal overload protection trip signal which resets only when the thermal content
has fallen 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. Observe that this have a considerable delay. Input can
also be used for other purposes if for some reason the auto reclosing shot needs to be
halted.
TR2P and TR3P
They are usually connected to the corresponding output of the trip function block. They
control the choice of dead time and the auto reclosing cycle according to the selected
program. Signal TR2P needs to be connected only if the trip function block has been
selected to give 1/2/3 pole trip and an auto reclosing cycle with two phase reclosing is
foreseen.
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 reclosing attempts are used. The
input will start the shots two to five.
WAIT
Used to hold back reclosing of the "low priority unit" during sequential auto 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.
ZONESTEP
The ZONESTEP input is used when coordination between local auto reclosers and
down stream auto reclosers is needed. When this input is activated the auto recloser
increases its actual shot number by one and enters "reclaim time" status. If a start is
received during this reclaim time the auto recloser is proceeding as usual but with the
dead time for the increased shot number. Every new increase of the shot number needs
a new activation of the ZONESTEP input. This functionality is controlled by the setting
ZoneSeqCoord.
Recommendations for output signals
Please see Figure 117, Figure
examples.
118 and Figure 119 and default factory configuration for
Section 14
Control
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