ABB REB670 Series Applications Manual page 186

Section 7
Current protection
tStartTimeout : When one of the two "Follow Modes" is used, there is a settable timer
tStartTimeout which will block the external START input signal when it times-out. This will
automatically also reset the
command. At the same time the STALARM output from the function will have logical value one.
To reset that condition external
prevent unwanted operation of the breaker failure function for cases where a permanent
START signal is given by mistake (e.g.due to a fault in the station battery system). Note that
any backup trip command will inhibit running of
Table 33: Setting summary for FunctionMode, StartMode, RetripMode and BuTripMode
No. StartMode
FunctionMode = Current
1 LatchedStart
2 LatchedStart
3 LatchedStart
4 FollowStart
5 FollowStart
6 FollowStart
7 FollowStart&
Mode
8 FollowStart&
Mode
9 FollowStart&
Mode
*) Set level depends on selected BuTripMode, that is, set level can be either IPh> or IN> or both.
180
t1 and t2 timers and consequently prevent any backup trip
RetripMode t1 and t2 initiated
with
Off external START
UseFunction external START
Mode
Always external START
Off external START
UseFunction external START
Mode
Always external START
Off external START
and current
above set level
UseFunction external START
Mode and current
above set level
Always external START
and current
above set level
START signal shall be removed. This is done in order to
tStartTimeout timer.
When t1 has
elapsed, TRRET will
never be given
be given if current
is above set level
of IPh>
always be given
never be given
be given if current
is above set level
of IPh>
be given if external
START is present
never be given
be given if current
is above set level
of IPh> and
external START is
present
be given if external
START is present
1MRK 505 370-UEN D
GUID-845257FF-2774-472A-B982-E9DDD8966988 v1
When t2 or t2MPh t1 and t2 and t2MPh
has elapsed, TRBU will be stopped
will be given if (reset) if
current is above t1 and (t2 or
set level *) t2MPh) and 150ms
expires and
current is below
set level *)
current is above t1 and (t2 or
set level *) t2MPh) and 150ms
expires and
current is below
set level *)
current is above t1 and (t2 or
set level *) t2MPh) and 150ms
expires and
current is below
set level *)
current is above external START
set level *) disappears
current is above external START
set level *) disappears
current is above external START
set level *) disappears
current is above current is below
set level *) and set level *) or
external START external START
present disappears
current is above current is below
set level *) and set level *) or
external START external START
present disappears
current is above current is below
set level *) and set level *) or
external START external START
present disappears
Busbar protection REB670
Application manual