Auto-reclosing - Single- and/or
three-phase
ABB Network Partner AB
1MRK 580 170-XEN
Page 5 - 61
Version 1.0-00
2.3 Function logic
2.3.1 Start and control of
the auto-reclosing
The automatic operation of the auto-reclosing function is controlled by
the Operation parameter and the input signals as described above. When it
is on, the AR01-SETON output is high (active). See Fig. 3.
The auto-reclosing function is started at a protection trip by the AR01-
START input signal. At a repeated trip, this signal is also activated to
make the reclosing program continue.
There are a number of conditions for the start to be accepted and a new
cycle started. After these checks, the starting signal is latched in, and the
Started state signal is activated. It can be interrupted by certain events.
AR01-CBCLOSED
The circuit breaker (CB) must be closed for at least five seconds to allow
a new AR cycle to start. It prevents start at closing onto a fault. It also pre-
vents the reclosing of a breaker that is open at the protection trip, which is
possible in a multiple breaker arrangement.
AR01-CBREADY
The circuit breaker must have its operating gear charged and ready for a
Close-Open (CO) or an Open-Close-Open (OCO) to allow the start of an
auto-reclosing cycle. This input can also be connected to circuits that
monitor the breaker pressure. If it is not ready at start, it is unlikely that it
is ready by the end of the AR open time.
AR01-TRSOTF
Protection trip switch-onto-fault. This signal alone does not start reclos-
ing. But at a reclosing onto a permanent fault it may appear and let the
function move on to AR01-UNSUC (unsuccessful) or second-shot reclos-
ing as programmed.
Blocking and inhibit signals may be created at other parts of the program
and are interrupting the reclosing cycle or prevent reclosing. One source
of such a signal is activation of the input AR01-INHIBIT in Fig. 6.
AR01-READY
This AR ready for a new reclosing cycle output is high when the function
is On, at rest, and prepared for operation. This signal can be used by a pro-
tection function to extend the reach before reclosing, when that function is
required.
AR01-UNSUC
The Reclosing unsuccessful output is activated at a possible new trip after
the selected number of reclosing shots, or at trip while reclosing is
blocked. The output resets after the reclaim time.
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