ABB Relion 670 Series Applications Manual page 298

Section 12
Control
connected to a permanently high source, TRUE. 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 136, Figure
1PT1 and 2PT1
Indicates that single-pole or two-pole auto reclosing is in progress. It is used to temporarily block an
ground-fault and/or pole disagreement function during the single-pole or two-pole open interval.
3PT1, 3PT2, 3PT3, 3PT4 and 3PT5
Indicates that three-pole auto reclosing shots one to five are in progress. The signals can be used as an
indication of progress or for own logic.
ABORTED
The ABORTED output indicates that the auto recloser is inhibited while it is in one of the following
internal states:
292
137 and Figure
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138 and default factory configuration for examples.
1MRK 505 370-UUS Rev. K
M12399-46 v9
Busbar protection REB670
Application manual